Ruby hangs forever when running `brew upgrade` or `brew doctor`

[mojotx]

Please note we will close your issue without comment if you delete, do not read or do not fill out the issue checklist below and provide ALL the requested information. If you repeatedly fail to use the issue template, we will block you from ever submitting issues to Homebrew again.

• [X] are reporting a bug others will be able to reproduce and not asking a question. If you're not sure or want to ask a question do so on our Discourse: https://discourse.brew.sh
• [X] ran a brew command and reproduced the problem with multiple formulae? If it's a problem with a single, official formula (not cask) please file this issue at Homebrew/homebrew-core: https://github.com/Homebrew/homebrew-core/issues/new/choose. If it's a brew cask problem please file this issue at https://github.com/Homebrew/homebrew-cask/issues/new/choose. If it's a tap (e.g. Homebrew/homebrew-php) problem please file this issue at the tap.
• [X] ran brew update and can still reproduce the problem?
• [X] ran brew doctor, fixed all issues and can still reproduce the problem?
• brew doctor is broken!
• [X] ran brew config and brew doctor and included their output with your issue?

To help us debug your issue please explain:

• What you were trying to do (and why)

The brew upgrade command has started hanging forever. I have to run kill -9 on the ruby process. I think this started after installing the latest Xcode 10 update to macOS 10.13.6 "High Sierra." This may be resolved next week when I upgrade to Mojave, but in the meantime, it's really annoying.

I tried brew doctor and it hangs as well.

• What happened (include command output)

Example output of brew doctor --debug --verbose:

$ brew doctor --debug --verbose
Checking check_access_directories
Checking check_brew_git_origin
Checking check_build_from_source
Checking check_clt_minimum_version
Checking check_clt_up_to_date
Checking check_coretap_git_origin
Checking check_exist_directories
Checking check_filesystem_case_sensitive
Checking check_for_anaconda
Checking check_for_bad_curl
Checking check_for_bad_python_symlink
Checking check_for_beta_xquartz
Checking check_for_config_scripts
Checking check_for_external_cmd_name_conflict
Checking check_for_gettext
Checking check_for_git
Checking check_for_iconv
Checking check_for_installed_developer_tools
Checking check_for_multiple_volumes
Checking check_for_non_prefixed_coreutils
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::FormulaLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/coreutils.rb
Checking check_for_non_prefixed_findutils
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::FormulaLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/findutils.rb
Checking check_for_other_frameworks
Checking check_for_other_package_managers
Checking check_for_pydistutils_cfg_in_home
Checking check_for_stray_dylibs
Checking check_for_stray_headers
Checking check_for_stray_las
Checking check_for_stray_pcs
Checking check_for_stray_static_libs
Checking check_for_symlinked_cellar
Checking check_for_tap_ruby_files_locations
Checking check_for_unlinked_but_not_keg_only
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libxml2.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/mysql-client.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gnu-getopt.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/icu4c.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/readline.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/qt.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/dirmngr.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::FormulaLoader): loading /usr/local/opt/dirmngr/.brew/dirmngr.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/sqlite.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/berkeley-db@4.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/curl.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gettext.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/tcl-tk.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/sphinx-doc.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gpg-agent.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::FormulaLoader): loading /usr/local/opt/gpg-agent/.brew/gpg-agent.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/m4.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libressl.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/openssl@1.1.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/openssl.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/bison.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libffi.rb
Checking check_for_unsupported_macos
Checking check_git_newline_settings
Checking check_git_status
Checking check_git_version
Checking check_homebrew_prefix
Checking check_if_xcode_needs_clt_installed
Checking check_ld_vars
Checking check_multiple_cellars
Checking check_ruby_version
Checking check_tmpdir
Checking check_tmpdir_sticky_bit
Checking check_user_path_1
Checking check_user_path_2
Checking check_user_path_3
Checking check_xcode_license_approved
Checking check_xcode_minimum_version
Checking check_xcode_prefix
Checking check_xcode_prefix_exists
Checking check_xcode_select_path
Checking check_xcode_up_to_date
Checking check_xquartz_up_to_date
Checking check_for_broken_symlinks
Checking check_missing_deps
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/mosh.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/git-lfs.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/imlib2.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/ant.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/lame.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/pkg-config.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gtk+.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::FormulaLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/vim.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libtiff.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libtool.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gmp.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libao.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/wget.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/ffmpeg.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/pinentry.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/wxmac.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/ctags.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/reposurgeon.rb
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/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libksba.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/docker.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/exiftool.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/python@2.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/little-cms2.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/lynx.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/go.rb
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/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/ldns.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libexif.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/html2text.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/cvsutils.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gdk-pixbuf.rb
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/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/htop.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/pypy.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gtk-mac-integration.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/giflib.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/docbook-xsl.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/colordiff.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/ncftp.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libcroco.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gnu-sed.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/asciidoc.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/sdl.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/maven-completion.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gawk.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libssh2.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/feh.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/librsvg.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/mercurial.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/mysql.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gpg-agent.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/autoconf.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/tcpreplay.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/tmux.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/hicolor-icon-theme.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/ksh.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/pth.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libtasn1.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/oniguruma.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/cvs.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gd.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/sip.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libssh.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/pcre2.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libevent.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/py2cairo.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/pcre.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/yubico-piv-tool.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/x264.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libepoxy.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/p0f.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/open-completion.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libidn.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/docbook.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/portaudio.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/sbcl.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/tmux-mem-cpu-load.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/jhead.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/node.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/jenv.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/jpeg.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/nmap.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/ssh-copy-id.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/zsh.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/jq.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libdnet.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libusb.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/autogen.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/guile.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/valgrind.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/bash-completion.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gnupg.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/pinentry-mac.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/p11-kit.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/pygobject.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/protobuf.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/ruby.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/rbenv.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/automake.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/pyqt.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/git.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/nvi.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/hydra.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gnutls.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gsettings-desktop-schemas.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/berkeley-db.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gradle-completion.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/fortune.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/npth.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/adns.rb
Killed: 9

I attached to the ruby process with the lldb debugger, and grabbed this backtrace in case it's useful to someone.

$ ps aux | head 1 && ps aux | fgrep ruby
USER               PID  %CPU %MEM      VSZ    RSS   TT  STAT STARTED      TIME COMMAND
mjarvis          11547 100.0  1.7  4607140 287912 s003  R+    6:46PM   0:09.44 /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby -W0 /usr/local/Homebrew/Library/Homebrew/brew.rb doctor --debug --verbose

$ lldb -p 11547
(lldb) process attach --pid 11547
Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "/usr/local/Cellar/python@2/2.7.15_1/Frameworks/Python.framework/Versions/2.7/lib/python2.7/copy.py", line 52, in <module>
    import weakref
  File "/usr/local/Cellar/python@2/2.7.15_1/Frameworks/Python.framework/Versions/2.7/lib/python2.7/weakref.py", line 14, in <module>
    from _weakref import (
ImportError: cannot import name _remove_dead_weakref
Process 11547 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGSTOP
    frame #0: 0x00007fff6b566115 libsystem_c.dylib`__get_buf + 317
libsystem_c.dylib`__get_buf:
->  0x7fff6b566115 <+317>: testq  %rcx, %rcx
    0x7fff6b566118 <+320>: jne    0x7fff6b56610c            ; <+308>
    0x7fff6b56611a <+322>: jmp    0x7fff6b566121            ; <+329>
    0x7fff6b56611c <+324>: testl  %r15d, %r15d
Target 0: (ruby) stopped.

Executable module set to "/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby".
Architecture set to: x86_64h-apple-macosx.
(lldb) bt all
* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGSTOP
  * frame #0: 0x00007fff6b566115 libsystem_c.dylib`__get_buf + 317
    frame #1: 0x00007fff6b5651ee libsystem_c.dylib`hash_access + 354
    frame #2: 0x00007fff6b567ac2 libsystem_c.dylib`dbm_fetch + 31
    frame #3: 0x0000000100036e2a ruby`fdbm_fetch + 190
    frame #4: 0x000000010020d541 ruby`vm_call_cfunc + 788
    frame #5: 0x00000001002152cb ruby`vm_exec_core + 21582
    frame #6: 0x00000001002162c0 ruby`vm_exec + 140
    frame #7: 0x000000010021a4a2 ruby`vm_call0_body + 296
    frame #8: 0x0000000100222873 ruby`rb_funcallv + 1039
    frame #9: 0x000000010014e92e ruby`rb_class_new_instance + 51
    frame #10: 0x000000010020d541 ruby`vm_call_cfunc + 788
    frame #11: 0x0000000100211f60 ruby`vm_exec_core + 8419
    frame #12: 0x00000001002162c0 ruby`vm_exec + 140
    frame #13: 0x0000000100223050 ruby`rb_yield_1 + 528
    frame #14: 0x000000010022331b ruby`rb_yield + 584
    frame #15: 0x00000001000d0f5c ruby`rb_ary_each + 101
    frame #16: 0x000000010020d541 ruby`vm_call_cfunc + 788
    frame #17: 0x0000000100218a61 ruby`vm_call_method_each_type + 197
    frame #18: 0x00000001002198ab ruby`vm_call_general + 251
    frame #19: 0x0000000100211e64 ruby`vm_exec_core + 8167
    frame #20: 0x00000001002162c0 ruby`vm_exec + 140
    frame #21: 0x0000000100223050 ruby`rb_yield_1 + 528
    frame #22: 0x000000010022331b ruby`rb_yield + 584
    frame #23: 0x00000001000d0f5c ruby`rb_ary_each + 101
    frame #24: 0x000000010020d541 ruby`vm_call_cfunc + 788
    frame #25: 0x0000000100218a61 ruby`vm_call_method_each_type + 197
    frame #26: 0x00000001002198ab ruby`vm_call_general + 251
    frame #27: 0x0000000100211e64 ruby`vm_exec_core + 8167
    frame #28: 0x00000001002162c0 ruby`vm_exec + 140
    frame #29: 0x00000001001058e4 ruby`ruby_exec_internal + 193
    frame #30: 0x0000000100105920 ruby`ruby_exec_node + 30
    frame #31: 0x0000000100107da1 ruby`ruby_run_node + 52
    frame #32: 0x00000001000046a5 ruby`main + 79
    frame #33: 0x0000000100004634 ruby`start + 52
  thread #2
    frame #0: 0x00007fff6b65009a libsystem_kernel.dylib`poll + 10
    frame #1: 0x000000010022d540 ruby`thread_timer + 274
    frame #2: 0x00007fff6b816661 libsystem_pthread.dylib`_pthread_body + 340
    frame #3: 0x00007fff6b81650d libsystem_pthread.dylib`_pthread_start + 377
    frame #4: 0x00007fff6b815bf9 libsystem_pthread.dylib`thread_start + 13
(lldb) ^D

Here's the output of brew config:

HOMEBREW_VERSION: 1.7.5-40-g1ff42f9
ORIGIN: https://github.com/Homebrew/brew.git
HEAD: 1ff42f90586a5f600aa34b9edf8f8e842f2fc461
Last commit: 4 hours ago
Core tap ORIGIN: https://github.com/Homebrew/homebrew-core
Core tap HEAD: 56c500b569c724b049be7ab9e12d9693f85522f9
Core tap last commit: 4 hours ago
HOMEBREW_PREFIX: /usr/local
HOMEBREW_DEV_CMD_RUN: 1
HOMEBREW_GIT: git
HOMEBREW_GITHUB_API_TOKEN: set
HOMEBREW_INSTALL_BADGE: ☕️
HOMEBREW_VISUAL: vim
CPU: octa-core 64-bit skylake
Homebrew Ruby: 2.3.7 => /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/2.3.7/bin/ruby
Clang: 10.0 build 1000
Git: 2.19.0 => /usr/local/bin/git
Curl: 7.54.0 => /usr/bin/curl
Java: 10.0.2, 1.8.0_181
macOS: 10.13.6-x86_64
CLT: 10.0.0.0.1.1535735448
CLT headers: N/A
Xcode: 10.0
XQuartz: 2.7.11 => /opt/X11

• What you expected to happen

I expected that brew doctor and other brew commands to exit normally.

• Step-by-step reproduction instructions (by running brew commands)

Right now, brew is broken and it hangs after running brew upgrade, forcing me to kill -9 the ruby process.

EDIT: I ran the sample command on the ruby process, and here's what it spat out:

Sampling process 14270 for 10 seconds with 1 millisecond of run time between samples
Sampling completed, processing symbols...
Sample analysis of process 14270 written to file /tmp/ruby_2018-09-19_191520_Diua.sample.txt

Analysis of sampling ruby (pid 14270) every 1 millisecond
Process:         ruby [14270]
Path:            /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/2.3.7/bin/ruby
Load Address:    0x100000000
Identifier:      ruby
Version:         ???
Code Type:       X86-64
Parent Process:  bash [1043]

Date/Time:       2018-09-19 19:15:20.072 -0500
Launch Time:     2018-09-19 19:15:07.074 -0500
OS Version:      Mac OS X 10.13.6 (17G65)
Report Version:  7
Analysis Tool:   /usr/bin/sample

Physical footprint:         450.6M
Physical footprint (peak):  450.6M
----

Call graph:
    9105 Thread_128045   DispatchQueue_1: com.apple.main-thread  (serial)
    + 9105 start  (in ruby) + 52  [0x100004634]
    +   9105 main  (in ruby) + 79  [0x1000046a5]
    +     9105 ruby_run_node  (in ruby) + 52  [0x100107da1]
    +       9105 ruby_exec_node  (in ruby) + 30  [0x100105920]
    +         9105 ruby_exec_internal  (in ruby) + 193  [0x1001058e4]
    +           9105 vm_exec  (in ruby) + 140  [0x1002162c0]
    +             9105 vm_exec_core  (in ruby) + 8167  [0x100211e64]
    +               9105 vm_call_general  (in ruby) + 251  [0x1002198ab]
    +                 9105 vm_call_method_each_type  (in ruby) + 197  [0x100218a61]
    +                   9105 vm_call_cfunc  (in ruby) + 788  [0x10020d541]
    +                     9105 rb_ary_each  (in ruby) + 101  [0x1000d0f5c]
    +                       9105 rb_yield  (in ruby) + 584  [0x10022331b]
    +                         9105 rb_yield_1  (in ruby) + 528  [0x100223050]
    +                           9105 vm_exec  (in ruby) + 140  [0x1002162c0]
    +                             9105 vm_exec_core  (in ruby) + 8167  [0x100211e64]
    +                               9105 vm_call_general  (in ruby) + 251  [0x1002198ab]
    +                                 9105 vm_call_method_each_type  (in ruby) + 197  [0x100218a61]
    +                                   9105 vm_call_cfunc  (in ruby) + 788  [0x10020d541]
    +                                     9105 rb_ary_each  (in ruby) + 101  [0x1000d0f5c]
    +                                       9105 rb_yield  (in ruby) + 584  [0x10022331b]
    +                                         9105 rb_yield_1  (in ruby) + 528  [0x100223050]
    +                                           9105 vm_exec  (in ruby) + 140  [0x1002162c0]
    +                                             9105 vm_exec_core  (in ruby) + 8419  [0x100211f60]
    +                                               9105 vm_call_cfunc  (in ruby) + 788  [0x10020d541]
    +                                                 9105 rb_class_new_instance  (in ruby) + 51  [0x10014e92e]
    +                                                   9105 rb_funcallv  (in ruby) + 1039  [0x100222873]
    +                                                     9105 vm_call0_body  (in ruby) + 296  [0x10021a4a2]
    +                                                       9105 vm_exec  (in ruby) + 140  [0x1002162c0]
    +                                                         9105 vm_exec_core  (in ruby) + 21582  [0x1002152cb]
    +                                                           9105 vm_call_cfunc  (in ruby) + 788  [0x10020d541]
    +                                                             9105 fdbm_fetch  (in ruby) + 190  [0x100036e2a]
    +                                                               9105 dbm_fetch  (in libsystem_c.dylib) + 31  [0x7fff6b567ac2]
    +                                                                 5994 hash_access  (in libsystem_c.dylib) + 319  [0x7fff6b5651cb]
    +                                                                 ! 5994 __find_last_page  (in libsystem_c.dylib) + 75  [0x7fff6b56592c]
    +                                                                 !   5873 __get_buf  (in libsystem_c.dylib) + 317,313,...  [0x7fff6b566115,0x7fff6b566111,...]
    +                                                                 !   56 __get_buf  (in libsystem_c.dylib) + 468  [0x7fff6b5661ac]
    +                                                                 !   : 56 calloc  (in libsystem_malloc.dylib) + 30  [0x7fff6b6a958e]
    +                                                                 !   :   55 malloc_zone_calloc  (in libsystem_malloc.dylib) + 87  [0x7fff6b6a8c7c]
    +                                                                 !   :   | 50 szone_malloc_should_clear  (in libsystem_malloc.dylib) + 2744  [0x7fff6b6a7cd1]
    +                                                                 !   :   | + 50 _platform_bzero$VARIANT$Haswell  (in libsystem_platform.dylib) + 53,114,...  [0x7fff6b810c75,0x7fff6b810cb2,...]
    +                                                                 !   :   | 5 szone_malloc_should_clear  (in libsystem_malloc.dylib) + 2778,1479,...  [0x7fff6b6a7cf3,0x7fff6b6a77e0,...]
    +                                                                 !   :   1 malloc_zone_calloc  (in libsystem_malloc.dylib) + 90  [0x7fff6b6a8c7f]
    +                                                                 !   56 __get_buf  (in libsystem_c.dylib) + 950  [0x7fff6b56638e]
    +                                                                 !   : 54 __get_page  (in libsystem_c.dylib) + 220  [0x7fff6b567421]
    +                                                                 !   : | 54 __pread_nocancel  (in libsystem_kernel.dylib) + 10,0  [0x7fff6b64e956,0x7fff6b64e94c]
    +                                                                 !   : 1 DYLD-STUB$$pread$NOCANCEL  (in libsystem_c.dylib) + 0  [0x7fff6b5cf64c]
    +                                                                 !   : 1 __get_page  (in libsystem_c.dylib) + 226  [0x7fff6b567427]
    +                                                                 !   9 __get_buf  (in libsystem_c.dylib) + 442  [0x7fff6b566192]
    +                                                                 !     9 calloc  (in libsystem_malloc.dylib) + 30  [0x7fff6b6a958e]
    +                                                                 !       9 malloc_zone_calloc  (in libsystem_malloc.dylib) + 87  [0x7fff6b6a8c7c]
    +                                                                 !         4 szone_malloc_should_clear  (in libsystem_malloc.dylib) + 42,184,...  [0x7fff6b6a7243,0x7fff6b6a72d1,...]
    +                                                                 !         3 default_zone_calloc  (in libsystem_malloc.dylib) + 49,45  [0x7fff6b6b7254,0x7fff6b6b7250]
    +                                                                 !         2 szone_malloc_should_clear  (in libsystem_malloc.dylib) + 1321  [0x7fff6b6a7742]
    +                                                                 !           2 _platform_memset$VARIANT$Haswell  (in libsystem_platform.dylib) + 0  [0x7fff6b810c00]
    +                                                                 3111 hash_access  (in libsystem_c.dylib) + 354  [0x7fff6b5651ee]
    +                                                                   3053 __get_buf  (in libsystem_c.dylib) + 317,313,...  [0x7fff6b566115,0x7fff6b566111,...]
    +                                                                   33 __get_buf  (in libsystem_c.dylib) + 468  [0x7fff6b5661ac]
    +                                                                   : 33 calloc  (in libsystem_malloc.dylib) + 30  [0x7fff6b6a958e]
    +                                                                   :   32 malloc_zone_calloc  (in libsystem_malloc.dylib) + 87  [0x7fff6b6a8c7c]
    +                                                                   :   | 29 szone_malloc_should_clear  (in libsystem_malloc.dylib) + 2744  [0x7fff6b6a7cd1]
    +                                                                   :   | + 29 _platform_bzero$VARIANT$Haswell  (in libsystem_platform.dylib) + 53,57,...  [0x7fff6b810c75,0x7fff6b810c79,...]
    +                                                                   :   | 2 szone_malloc_should_clear  (in libsystem_malloc.dylib) + 1479,2748  [0x7fff6b6a77e0,0x7fff6b6a7cd5]
    +                                                                   :   | 1 szone_malloc_should_clear  (in libsystem_malloc.dylib) + 1600  [0x7fff6b6a7859]
    +                                                                   :   |   1 small_malloc_from_free_list  (in libsystem_malloc.dylib) + 530  [0x7fff6b6a91c8]
    +                                                                   :   1 malloc_zone_calloc  (in libsystem_malloc.dylib) + 90  [0x7fff6b6a8c7f]
    +                                                                   20 __get_buf  (in libsystem_c.dylib) + 950  [0x7fff6b56638e]
    +                                                                   : 20 __get_page  (in libsystem_c.dylib) + 220  [0x7fff6b567421]
    +                                                                   :   20 __pread_nocancel  (in libsystem_kernel.dylib) + 10  [0x7fff6b64e956]
    +                                                                   4 __get_buf  (in libsystem_c.dylib) + 442  [0x7fff6b566192]
    +                                                                   : 3 calloc  (in libsystem_malloc.dylib) + 30  [0x7fff6b6a958e]
    +                                                                   : | 3 malloc_zone_calloc  (in libsystem_malloc.dylib) + 87  [0x7fff6b6a8c7c]
    +                                                                   : |   1 default_zone_calloc  (in libsystem_malloc.dylib) + 45  [0x7fff6b6b7250]
    +                                                                   : |   1 szone_malloc_should_clear  (in libsystem_malloc.dylib) + 422  [0x7fff6b6a73bf]
    +                                                                   : |   + 1 tiny_malloc_from_free_list  (in libsystem_malloc.dylib) + 10  [0x7fff6b6a819d]
    +                                                                   : |   1 szone_malloc_should_clear  (in libsystem_malloc.dylib) + 1321  [0x7fff6b6a7742]
    +                                                                   : |     1 _platform_memset$VARIANT$Haswell  (in libsystem_platform.dylib) + 19  [0x7fff6b810c13]
    +                                                                   : 1 calloc  (in libsystem_malloc.dylib) + 0  [0x7fff6b6a9570]
    +                                                                   1 DYLD-STUB$$calloc  (in libsystem_c.dylib) + 0  [0x7fff6b5cf382]
    9105 Thread_128194
      9105 thread_start  (in libsystem_pthread.dylib) + 13  [0x7fff6b815bf9]
        9105 _pthread_start  (in libsystem_pthread.dylib) + 377  [0x7fff6b81650d]
          9105 _pthread_body  (in libsystem_pthread.dylib) + 340  [0x7fff6b816661]
            9105 thread_timer  (in ruby) + 274  [0x10022d540]
              9105 poll  (in libsystem_kernel.dylib) + 10  [0x7fff6b65009a]

Total number in stack (recursive counted multiple, when >=5):

Sort by top of stack, same collapsed (when >= 5):
        poll  (in libsystem_kernel.dylib)        9105
        __get_buf  (in libsystem_c.dylib)        8926
        _platform_bzero$VARIANT$Haswell  (in libsystem_platform.dylib)        79
        __pread_nocancel  (in libsystem_kernel.dylib)        74
        szone_malloc_should_clear  (in libsystem_malloc.dylib)        11

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    0x7fff6b534000 -     0x7fff6b54bfff  libsystem_asl.dylib (356.70.1) <39E46A6F-B228-3E78-B83E-1779F9707A39> /usr/lib/system/libsystem_asl.dylib
    0x7fff6b54c000 -     0x7fff6b54cfff  libsystem_blocks.dylib (67) <17303FDF-0D2D-3963-B05E-B4DF63052D47> /usr/lib/system/libsystem_blocks.dylib
    0x7fff6b54d000 -     0x7fff6b5d6ff7  libsystem_c.dylib (1244.50.9) <1187BFE8-4576-3247-8177-481554E1F9E7> /usr/lib/system/libsystem_c.dylib
    0x7fff6b5d7000 -     0x7fff6b5daffb  libsystem_configuration.dylib (963.50.8) <DF6B5287-203E-30CB-9947-78DF446C72B8> /usr/lib/system/libsystem_configuration.dylib
    0x7fff6b5db000 -     0x7fff6b5deffb  libsystem_coreservices.dylib (51) <486000D3-D8CB-3BE7-8EE5-8BF380DE6DF7> /usr/lib/system/libsystem_coreservices.dylib
    0x7fff6b5df000 -     0x7fff6b5e0fff  libsystem_darwin.dylib (1244.50.9) <09C21A4A-9EE0-388B-A9D9-DFF8F6758791> /usr/lib/system/libsystem_darwin.dylib
    0x7fff6b5e1000 -     0x7fff6b5e7ff7  libsystem_dnssd.dylib (878.70.2) <3290768B-54DE-3AB6-B155-AC0950AC5564> /usr/lib/system/libsystem_dnssd.dylib
    0x7fff6b5e8000 -     0x7fff6b631ff7  libsystem_info.dylib (517.30.1) <AB634A98-B8AA-3804-8436-38261FC8EC4D> /usr/lib/system/libsystem_info.dylib
    0x7fff6b632000 -     0x7fff6b658ff7  libsystem_kernel.dylib (4570.71.2) <F22B8D73-69D8-36D7-BF66-7F9AC70C08C2> /usr/lib/system/libsystem_kernel.dylib
    0x7fff6b659000 -     0x7fff6b6a4fcb  libsystem_m.dylib (3147.50.1) <8CFB51C9-B422-3379-8552-064C63943A23> /usr/lib/system/libsystem_m.dylib
    0x7fff6b6a5000 -     0x7fff6b6c4fff  libsystem_malloc.dylib (140.50.6) <7FD43735-9DDD-300E-8C4A-F909A74BDF49> /usr/lib/system/libsystem_malloc.dylib
    0x7fff6b6c5000 -     0x7fff6b7f5ff7  libsystem_network.dylib (1229.70.2) <5E86B2DE-9E15-3354-8714-4094ED5F698D> /usr/lib/system/libsystem_network.dylib
    0x7fff6b7f6000 -     0x7fff6b800ffb  libsystem_networkextension.dylib (767.70.1) <D23EAFC1-E8BD-34D5-969C-6E45A1C3B4E4> /usr/lib/system/libsystem_networkextension.dylib
    0x7fff6b801000 -     0x7fff6b80aff3  libsystem_notify.dylib (172) <08012EC0-2CD2-34BE-BF93-E7F56491299A> /usr/lib/system/libsystem_notify.dylib
    0x7fff6b80b000 -     0x7fff6b812ff7  libsystem_platform.dylib (161.50.1) <6355EE2D-5456-3CA8-A227-B96E8F1E2AF8> /usr/lib/system/libsystem_platform.dylib
    0x7fff6b813000 -     0x7fff6b81efff  libsystem_pthread.dylib (301.50.1) <0E51CCBA-91F2-34E1-BF2A-FEEFD3D321E4> /usr/lib/system/libsystem_pthread.dylib
    0x7fff6b81f000 -     0x7fff6b822fff  libsystem_sandbox.dylib (765.70.1) <553DFCC6-9D31-3B9C-AB7C-30F6F265786D> /usr/lib/system/libsystem_sandbox.dylib
    0x7fff6b823000 -     0x7fff6b824ff3  libsystem_secinit.dylib (30) <DE8D14E8-A276-3FF8-AE13-77F7040F33C1> /usr/lib/system/libsystem_secinit.dylib
    0x7fff6b825000 -     0x7fff6b82cff7  libsystem_symptoms.dylib (820.60.2) <585BDFA2-D54D-39D0-8046-44E824DABD43> /usr/lib/system/libsystem_symptoms.dylib
    0x7fff6b82d000 -     0x7fff6b840fff  libsystem_trace.dylib (829.70.1) <3A6CB706-8CA6-3616-8AFC-14AAD7FAF187> /usr/lib/system/libsystem_trace.dylib
    0x7fff6b842000 -     0x7fff6b847ff7  libunwind.dylib (35.3) <BEF3FB49-5604-3B5F-82B5-332B80023AC3> /usr/lib/system/libunwind.dylib
    0x7fff6b848000 -     0x7fff6b875ff7  libxpc.dylib (1205.70.9) <0BC7AD67-671D-31D4-8B88-C317B8379598> /usr/lib/system/libxpc.dylib

[MikeMcQuaid]

This looks very similar to the backtrace in https://github.com/Homebrew/brew/issues/4923 so folding into that.

[MikeMcQuaid]

@mojoTX This should now be fixed if you brew update without any intervention being required.

[mojotx]

Your change in commit seems to have resolved the issue.

$ brew doctor --debug --verbose
Checking check_access_directories
Checking check_brew_git_origin
Checking check_build_from_source
Checking check_clt_minimum_version
Checking check_clt_up_to_date
Checking check_coretap_git_origin
Checking check_exist_directories
Checking check_filesystem_case_sensitive
Checking check_for_anaconda
Checking check_for_bad_curl
Checking check_for_bad_python_symlink
Checking check_for_beta_xquartz
Checking check_for_config_scripts
Checking check_for_external_cmd_name_conflict
Checking check_for_gettext
Checking check_for_git
Checking check_for_iconv
Checking check_for_installed_developer_tools
Checking check_for_multiple_volumes
Checking check_for_non_prefixed_coreutils
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::FormulaLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/coreutils.rb
Checking check_for_non_prefixed_findutils
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::FormulaLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/findutils.rb
Checking check_for_other_frameworks
Checking check_for_other_package_managers
Checking check_for_pydistutils_cfg_in_home
Checking check_for_stray_dylibs
Checking check_for_stray_headers
Checking check_for_stray_las
Checking check_for_stray_pcs
Checking check_for_stray_static_libs
Checking check_for_symlinked_cellar
Checking check_for_tap_ruby_files_locations
Checking check_for_unlinked_but_not_keg_only
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libxml2.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/mysql-client.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gnu-getopt.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/icu4c.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/readline.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/qt.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/dirmngr.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::FormulaLoader): loading /usr/local/opt/dirmngr/.brew/dirmngr.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/sqlite.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/berkeley-db@4.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/curl.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gettext.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/tcl-tk.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/sphinx-doc.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gpg-agent.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::FormulaLoader): loading /usr/local/opt/gpg-agent/.brew/gpg-agent.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/m4.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libressl.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/openssl@1.1.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/openssl.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/bison.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libffi.rb
Checking check_for_unsupported_macos
Checking check_git_newline_settings
Checking check_git_status
Checking check_git_version
Checking check_homebrew_prefix
Checking check_if_xcode_needs_clt_installed
Checking check_ld_vars
Checking check_multiple_cellars
Checking check_ruby_version
Checking check_tmpdir
Checking check_tmpdir_sticky_bit
Checking check_user_path_1
Checking check_user_path_2
Checking check_user_path_3
Checking check_xcode_license_approved
Checking check_xcode_minimum_version
Checking check_xcode_prefix
Checking check_xcode_prefix_exists
Checking check_xcode_select_path
Checking check_xcode_up_to_date
Checking check_xquartz_up_to_date
Checking check_for_broken_symlinks
Checking check_missing_deps
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/mosh.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/git-lfs.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/imlib2.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/ant.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/lame.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/pkg-config.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gtk+.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::FormulaLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/vim.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libtiff.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libtool.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gmp.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libao.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/wget.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/ffmpeg.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/pinentry.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/wxmac.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/ctags.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/reposurgeon.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libidn2.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/mas.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/cvs2svn.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/parallel.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::FormulaLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/moreutils.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/bash-git-prompt.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/xvid.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libksba.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/docker.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/exiftool.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/python@2.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/little-cms2.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/lynx.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/go.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libpng.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/miniupnpc.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/ghostscript.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gtk+3.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/nettle.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/pixman.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gdbm.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gnuplot.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/netcat.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/cmake.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/freetype.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/mpfr.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/python.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/ncrack.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gnu-tar.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/p7zip.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/boost.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/cscope.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libunistring.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/clang-format.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/pango.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libyaml.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/pygtk.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/xmlto.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/ldns.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libexif.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/html2text.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/cvsutils.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gdk-pixbuf.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/bdw-gc.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/maven.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/mtr.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/zeromq.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/perl.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/atk.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/harfbuzz.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/pdfcrack.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/tdsmith/homebrew-ham/chirp.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/openssh.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/glib.rb
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/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby -rdbm -e DBM.open\(\'/Users/mjarvis/Library/Caches/Homebrew/linkage\',\ 436,\ DBM::READER\).size
==> Failed to read /Users/mjarvis/Library/Caches/Homebrew/linkage!
/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby -rdbm -e DBM.open\(\'/Users/mjarvis/Library/Caches/Homebrew/linkage\',\ 436,\ DBM::READER\).size
/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby -rdbm -e DBM.open\(\'/Users/mjarvis/Library/Caches/Homebrew/linkage\',\ 436,\ DBM::READER\).size
/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby -rdbm -e DBM.open\(\'/Users/mjarvis/Library/Caches/Homebrew/linkage\',\ 436,\ DBM::READER\).size
/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby -rdbm -e DBM.open\(\'/Users/mjarvis/Library/Caches/Homebrew/linkage\',\ 436,\ DBM::READER\).size
/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby -rdbm -e DBM.open\(\'/Users/mjarvis/Library/Caches/Homebrew/linkage\',\ 436,\ DBM::READER\).size
/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby -rdbm -e DBM.open\(\'/Users/mjarvis/Library/Caches/Homebrew/linkage\',\ 436,\ DBM::READER\).size
/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby -rdbm -e DBM.open\(\'/Users/mjarvis/Library/Caches/Homebrew/linkage\',\ 436,\ DBM::READER\).size
/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby -rdbm -e DBM.open\(\'/Users/mjarvis/Library/Caches/Homebrew/linkage\',\ 436,\ DBM::READER\).size
/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby -rdbm -e DBM.open\(\'/Users/mjarvis/Library/Caches/Homebrew/linkage\',\ 436,\ DBM::READER\).size
/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby -rdbm -e DBM.open\(\'/Users/mjarvis/Library/Caches/Homebrew/linkage\',\ 436,\ DBM::READER\).size
/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby -rdbm -e DBM.open\(\'/Users/mjarvis/Library/Caches/Homebrew/linkage\',\ 436,\ DBM::READER\).size
/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby -rdbm -e DBM.open\(\'/Users/mjarvis/Library/Caches/Homebrew/linkage\',\ 436,\ DBM::READER\).size
/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby -rdbm -e DBM.open\(\'/Users/mjarvis/Library/Caches/Homebrew/linkage\',\ 436,\ DBM::READER\).size
/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby -rdbm -e DBM.open\(\'/Users/mjarvis/Library/Caches/Homebrew/linkage\',\ 436,\ DBM::READER\).size
/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby -rdbm -e DBM.open\(\'/Users/mjarvis/Library/Caches/Homebrew/linkage\',\ 436,\ DBM::READER\).size
/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby -rdbm -e DBM.open\(\'/Users/mjarvis/Library/Caches/Homebrew/linkage\',\ 436,\ DBM::READER\).size
/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby -rdbm -e DBM.open\(\'/Users/mjarvis/Library/Caches/Homebrew/linkage\',\ 436,\ DBM::READER\).size
/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby -rdbm -e DBM.open\(\'/Users/mjarvis/Library/Caches/Homebrew/linkage\',\ 436,\ DBM::READER\).size
/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby -rdbm -e DBM.open\(\'/Users/mjarvis/Library/Caches/Homebrew/linkage\',\ 436,\ DBM::READER\).size
/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby -rdbm -e DBM.open\(\'/Users/mjarvis/Library/Caches/Homebrew/linkage\',\ 436,\ DBM::READER\).size
/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby -rdbm -e DBM.open\(\'/Users/mjarvis/Library/Caches/Homebrew/linkage\',\ 436,\ DBM::READER\).size
Your system is ready to brew.

[mojotx]

@mojoTX This should now be fixed if you brew update without any intervention being required.

@MikeMcQuaid It is fixed! Thank you! 😃