bash fork error

[abra]

After adding these two lines in .bash_profile

export PATH="$HOME/.plenv/bin:$PATH"
eval "$(plenv init -)"

I got messages bash: fork: retry: No child processes and bash: fork: Resource temporarily unavailable in terminal when trying open new tab in iterm2 with bash or run any other command line tools, but these messages keep showing up every time.

OS: OS X 10.11 El Capitan Bash version: 4.3.42

[miyagawa]

Are you using the latest plenv?

Previous versions of plenv had issues with perl executable commands in your PATH such as perl power tools because it recursively forks plenv commands.

[abra]

Yes, I'm using latest version 2.2.0.

[miyagawa]

You're likely to have a perl-based command such as head in your PATH that is causing the recursive fork. ls ~/.plenv/shims and you'll see some fishy executable there.

[abra]

I don't see any files in ~/.plenv/shims, it's empty.

[miyagawa]

So where exactly is ls though? which ls should show it.

[abra]

/bin/ls

[miyagawa]

if you run /bin/ls do you see the error? I doubt that ls is actually causing the error.

[abra]

Yes, when I run /bin/ls I see message bash: fork: retry: No child processes

[miyagawa]

I think your system is horsed already and anything that involves fork will see that error, regardless of whether it uses plenv or not.

[miyagawa]

I'm sure this issue has been solved in the latest git of plenv. Don't you have perl power tools or some CLI command line installed using perl? Otherwise all I can suggest is to remove ~/.plenv and start over.

[abra]

When I comment lines export PATH="$HOME/.plenv/bin:$PATH" and eval "$(plenv init -)" and re-run bash, error doesn't appear.

[miyagawa]

How did you install plenv? If you're not using git, does installing from git help? If you're using git, which commit hash are you at? git rev-parse HEAD. If you're on the latest, does checking out old releases fix the issue?

[abra]

My steps to install plenv:

1. git clone https://github.com/tokuhirom/plenv.git ~/.plenv
2. echo 'export PATH="$HOME/.plenv/bin:$PATH"' >> ~/.bash_profile
3. echo 'eval "$(plenv init -)"' >> ~/.bash_profile
4. exec $SHELL -l and after last step I got error message in terminal when tried to run cd/ls/tree/etc

[miyagawa]

Can you try older release using this method to checkout specific tag or commit in git? https://github.com/tokuhirom/plenv#upgrading

[abra]

I checked (not every) commit up to 26dbef7 and still get error messages. I think something wrong with my environment, but I have no idea why.

[syohex]

@abra Could you show us ulimit -a ? Did you set too small value to processes parameter ?

[miyagawa]

@abra If you just do:

export PATH="$HOME/.plenv/bin:$PATH"
bash -x $(which plenv) init  -

what does it show? I wonder if it might show some infinite loops there.

[abra]

ulimit -a

core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
file size               (blocks, -f) unlimited
max locked memory       (kbytes, -l) unlimited
max memory size         (kbytes, -m) unlimited
open files                      (-n) 256
pipe size            (512 bytes, -p) 1
stack size              (kbytes, -s) 8192
cpu time               (seconds, -t) unlimited
max user processes              (-u) 709
virtual memory          (kbytes, -v) unlimited

[abra]

[~] ··············································· [27/01/16 07:47:43]
→ export PATH="$HOME/.plenv/bin:$PATH"
[~] ··············································· [27/01/16 07:48:43]
→ bash -x $(which plenv) init  -
+ set -e
+ export -n CDPATH
+ '[' init = --debug ']'
+ '[' -n '' ']'
+ read READLINK
++ type -p greadlink readlink
+ export READLINK
+ '[' -z '' ']'
+ PLENV_ROOT=/Users/abra/.plenv
+ export PLENV_ROOT
+ '[' -z '' ']'
+ PLENV_DIR=/Users/abra
+ export PLENV_DIR
+ shopt -s nullglob
++ abs_dirname /Users/abra/.plenv/bin/plenv
++ local cwd=/Users/abra
++ local path=/Users/abra/.plenv/bin/plenv
++ '[' -n /Users/abra/.plenv/bin/plenv ']'
++ cd /Users/abra/.plenv/bin
++ local name=plenv
+++ /opt/local/bin/greadlink plenv
++ path=../libexec/plenv
++ '[' -n ../libexec/plenv ']'
++ cd ../libexec
++ local name=plenv
+++ /opt/local/bin/greadlink plenv
+++ true
++ path=
++ '[' -n '' ']'
++ pwd
++ cd /Users/abra
+ bin_path=/Users/abra/.plenv/libexec
+ for plugin_bin in '"${PLENV_ROOT}/plugins/"*/bin'
+ bin_path=/Users/abra/.plenv/libexec:/Users/abra/.plenv/plugins/perl-build/bin
+ export PATH=/Users/abra/.plenv/libexec:/Users/abra/.plenv/plugins/perl-build/bin:/Users/abra/.plenv/bin:/Users/abra/.cargo/bin:/Users/abra/.go/bin:/opt/vert.x-3.2.0-full/bin:/opt/apache-maven-3.3.9/bin:/Users/abra/android_sdk/tools:/Users/abra/android_sdk/platform-tools:/opt/local/bin:/opt/local/sbin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/go/bin
+ PATH=/Users/abra/.plenv/libexec:/Users/abra/.plenv/plugins/perl-build/bin:/Users/abra/.plenv/bin:/Users/abra/.cargo/bin:/Users/abra/.go/bin:/opt/vert.x-3.2.0-full/bin:/opt/apache-maven-3.3.9/bin:/Users/abra/android_sdk/tools:/Users/abra/android_sdk/platform-tools:/opt/local/bin:/opt/local/sbin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/go/bin
+ hook_path=:/Users/abra/.plenv/plenv.d:/usr/local/etc/plenv.d:/etc/plenv.d:/usr/lib/plenv/hooks
+ export PLENV_HOOK_PATH=:/Users/abra/.plenv/plenv.d:/usr/local/etc/plenv.d:/etc/plenv.d:/usr/lib/plenv/hooks
+ PLENV_HOOK_PATH=:/Users/abra/.plenv/plenv.d:/usr/local/etc/plenv.d:/etc/plenv.d:/usr/lib/plenv/hooks
+ shopt -u nullglob
+ command=init
+ case "$command" in
++ command -v plenv-init
+ command_path=/Users/abra/.plenv/libexec/plenv-init
+ '[' -z /Users/abra/.plenv/libexec/plenv-init ']'
+ shift 1
+ exec /Users/abra/.plenv/libexec/plenv-init -
export PATH="/Users/abra/.plenv/shims:${PATH}"
export PLENV_SHELL=bash
source '/Users/abra/.plenv/libexec/../completions/plenv.bash'

plenv() {
  local command

  command="$1"
  if [ "$#" -gt 0 ]; then
    shift
  fi

  case "$command" in
  rehash|shell)
    eval "`plenv "sh-$command" "$@"`";;
  *)
    command plenv "$command" "$@";;
  esac
}

[miyagawa]

@abra so ok - plenv init - won't cause any loops? When you eval it it happens? Can you trace that?

[syohex]

Your processes limit has no problem.

Can you reproduce without eval, to execute commands step by step or to load it from file(% plenv init - > plenv_init && source plenv_init)?

• export PATH=...
• export PLENV_SHEL=... ...
• Load completion file
• Define function

[abra]

I load file as you suggest ~/.plenv/bin/plenv init - > plenv_init && source plenv_init, then I export path export PATH="$HOME/.plenv/bin:$PATH" and exec $SHELL -l, after all I run command line tools ls/tree/etc.. as usual and they work without any error messages.

[syohex]

Did you use plenv in such case ?

And do you set any alias of eval or define eval function ?

• Output of % type eval ?

[abra]

When I loaded file plen_init, I didn't use plenv. I don't use eval in my alias or functions. % type eval eval is a shell builtin

my .bash_profile:

# Locales
export LC_ALL=en_US.UTF-8
export LANG=en_US.UTF-8

# Detect OS
# OS=$(uname -s)

# Don't put duplicate lines in the history.
# See bash(1) for more options ... or force ignoredups and ignorespace
# HISTCONTROL=ignoredups:ignorespace
HISTCONTROL=ignoredups:erasedups

# Check the window size after each command and, if necessary,
# update the values of LINES and COLUMNS.
shopt -s checkwinsize

# Append to the history file, don't overwrite it
shopt -s histappend

# For setting history length see HISTSIZE and HISTFILESIZE in bash(1)
HISTSIZE=
HISTFILESIZE=
HISTTIMEFORMAT="[%d/%m/%y %T] "
HISTFILE=~/.bash_eternal_history

# Bash prompt settings
NCY="\[\033[0;36m\]" # CYAN
LCY="\[\033[1;36m\]" # LIGHT CYAN
NGR="\[\033[0;32m\]" # GREEN
LGR="\[\033[1;32m\]" # LIGHT GREEN
NRD="\[\033[0;31m\]" # RED
LRD="\[\033[1;31m\]" # LIGHT RED
NBK="\[\033[0;30m\]" # BLACK
LBK="\[\033[1;30m\]" # LIGHT BLACK
NWT="\[\033[0;37m\]" # WHITE
LWT="\[\033[1;37m\]" # LIGHT WHITE
NYL="\[\033[0;33m\]" # YELLOW
LYL="\[\033[1;33m\]" # LIGHT YELLOW
NBL="\[\033[0;34m\]" # BLUE
LBL="\[\033[1;34m\]" # LIGHT BLUE
DFT="\[\033[0;39m\]" # DEFAULT
LDT="\[\033[1;39m\]" # LIGHT DEFAULT
NC="\[\033[0m\]"

#PS1="$LBK[ $NCY\u$LBK ] $NCY>$NC "
PS_LINE=`printf -- '·%.0s' {1..200}`

function __parse_git_branch() {
    PS_BRANCH=''

    GREEN="$(echo -e "\033[0;32m")"
    YELLOW="$(echo -e "\033[0;33m")"
    BLACK="$(echo -e "\033[1;30m")"
    RESET="$(echo -e "\033[0m")"

    DATE="$(date +"%d/%m/%y %T")"
    PS_FILL=${PS_LINE:0:$COLUMNS}
    # if [ -d .svn ]; then {{{
    #     PS_BRANCH="(svn: r$(svn info|awk '/Revision/{print $2}'))"
    #     return
    # elif [ -f _FOSSIL_ -o -f .fslckout ]; then
    #     PS_BRANCH="(fossil: $(fossil status|awk '/tags/{print $2}')) "
    #     return
    # fi }}}
    ref=$(git symbolic-ref HEAD 2> /dev/null) || return
    BRANCH=$'\u2387 '
    PS_BRANCH="$BLACK($YELLOW$BRANCH ${ref#refs/heads/}$BLACK)$RESET "
}

export PROMPT_COMMAND=__parse_git_branch
PS_INFO="$LBK[$NBL\w$LBK]$NC"
PS_GIT="$NYL\$PS_BRANCH$NC"
PS_TIME="\[\033[\$((COLUMNS-19))G\] $LBK[$NGR\$DATE$LBK]"
ARW="$NGR\342\206\222 $NC"
export PS1="$LBK\${PS_FILL}\[\033[0G\]${PS_INFO} ${PS_GIT}${PS_TIME}\n$ARW"

# Only show the current directory's name in the tab
# if [ $ITERM_SESSION_ID ]; then
#     export PROMPT_COMMAND="echo -ne '\033]0;${PWD##*/}\007'; $PROMPT_COMMAND"
# fi

# Save and reload the history after each command finishes
# export PROMPT_COMMAND="history -n; history -a; history -c; history -r; $PROMPT_COMMAND"
export PROMPT_COMMAND="history -a; history -c; history -r; $PROMPT_COMMAND"

# Dir colors
if [ "$TERM" != "dumb" ]; then
    export LS_OPTIONS='--color=auto'
    export CLICOLOR=1
fi

# Terminal colors
export CLICOLOR=1
export LSCOLORS=exfxcxdxcxegedabagacad

# Grep highlight color
export GREP_COLOR='0;33;40'

# Aliases
alias c='clear'
alias tree='tree -C -N'
alias now='date +"%T"'
alias dt='date "+%F %T"'
alias ll='ls -lFh'
alias llt='ll -t'
alias ltl='llt | less'
alias lla='ls -laFh'
alias la='ls -A'
alias l='ls -CF'
alias lls='ll -S'
alias lhd='lla -d .??*'
alias df='df -H'
alias du='du -sh'
alias rm='rm -v'
alias h='history'
alias e='exit'
alias grep='grep --color=auto'
alias unigrep='grep -P "[^\x00-\x7F]"'
alias egrep='egrep --color=auto'
alias fgrep='fgrep --color=auto'
alias lsl="ls -lhFA | less"
alias ..='cd ../'
alias ...='cd ../../'
alias ....='cd ../../../'
alias .....='cd ../../../../'
# Vagrant
alias vup="vagrant up"
alias vhalt="vagrant halt"
alias vs="vagrant suspend"
alias vr="vagrant resume"
alias vrld="vagrant reload"
alias vssh="vagrant ssh"
alias vstat="vagrant status"

# Show ip address
if [ -f $(which curl) ]; then
    alias myip='curl http://ifconfig.co'
fi

# alias for Mac OS X
alias m='open -a MacVim'
alias chrome="open -a Google\ Chrome"
# alias adobe="open -a Adobe\ Reader"
alias firefox="open -a Firefox"
alias vlc="open -a vlc"
alias xee="open -a Xee³"
alias f="open -a Finder $PWD"

# Bash completion
if [ -f /opt/local/etc/profile.d/bash_completion.sh ]; then
    . /opt/local/etc/profile.d/bash_completion.sh
fi

# Where/What is this binary? Shows extended ls output
wtf () {
    which $1 | xargs ls -la
}

# Print working directory {{{
# [01/03/15 00:23:37] -> /Users/user after a cd
# cd () {
#     if [[ $@ == '-' ]]; then
#         builtin cd "$@" > /dev/null # We'll handle pwd.
#     else
#         builtin cd "$@"
#     fi
#         echo -e "\033[1;30m"[$(date +"%d/%m/%y %T")] \-\> "\033[0;33m"`pwd`"\033[0m"
# }
# }}}

# Create directory and browse to it
mcd () {
    mkdir -p "$@" && cd "$@"
}

# Open man page as PDF
function manpdf() {
    man -t "${1}" | open -f -a /Applications/Preview.app/
}

# Shows bitrate of mp3 file
bitrate () {
    echo `basename "$1"`: `file "$1" | sed 's/.*, \(.*\)kbps.*/\1/' | tr -d " " ` kbps
}

# Extract most know archives with one command
# usage: extract filename.zip
extract () {
    if [ -f $1 ]; then
        case $1 in
            *.tar.bz2) tar xjvf $1           ;;
            *.tar.gz)  tar xzvf $1           ;;
            *.bz2)     bzcat $1 > ${1%.bz2}  ;;
            *.rar)     unrar x $1            ;;
            *.gz)      zcat $1 > ${1%.gz}    ;;
            *.tar)     tar xvf $1            ;;
            *.tbz2)    tar xjvf $1           ;;
            *.tgz)     tar xzvf $1           ;;
            *.zip)     unzip $1              ;;
            *.rar)     unrar x $1            ;;
            *.Z)       uncompress $1         ;;
            *.7z)      7z x $1               ;;
            *.xz)      xz -d -v $1           ;;
            *.tbz)     tar xjvf              ;;
            *) echo "Unable to extract '$1'" ;;
        esac
    else
        echo "'$1' is not a valid file"
    fi
}

# Compress files with one command
# usage: compress zip filename
compress () {
    if [ $1 ]; then
        case $1 in
            tbz)    tar cjvf $2.tar.bz2 $2    ;;
            tgz)    tar czvf $2.tar.gz $2     ;;
            tar)    tar cpvf $2.tar $2        ;;
            bz2)    bzip2 -9 $2               ;;
            gz)     gzip -c -9 -n $2 > $2.gz  ;;
            zip)    zip -r $2.zip $2          ;;
            rar)    rar a -m5 $2.rar $2       ;;
            7z)     7z a -mx=9 $2.7z $2       ;;
            xz)     xz -z -9 -v $2            ;;
            *) echo "Unable to compress '$1'" ;;
        esac
    else
        echo "'$1' is not a valid file"
    fi
}

# Color man output
man() {
    env LESS_TERMCAP_mb=$(printf "\e[1;31m") \
    LESS_TERMCAP_md=$(printf "\e[0;33m") \
    LESS_TERMCAP_me=$(printf "\e[0m") \
    LESS_TERMCAP_se=$(printf "\e[0m") \
    LESS_TERMCAP_so=$(printf "\e[1;44;33m") \
    LESS_TERMCAP_ue=$(printf "\e[0m") \
    LESS_TERMCAP_us=$(printf "\e[0;32m") \
    man "$@"
}

# Man pages in vim {{{
# vman() {
#     vim -c "SuperMan $*"
#
#     if [ "$?" != "0" ]; then
#         echo "No manual entry for $*"
#     fi
# }
# }}}

# MacPorts
export PATH=/opt/local/bin:/opt/local/sbin:$PATH
export MANPATH=/opt/local/share/man:$MANPATH

# Android SDK tools
export PATH=/Users/abra/android_sdk/platform-tools:$PATH
export PATH=/Users/abra/android_sdk/tools:$PATH

# MySQL
# export PATH=/opt/local/lib/mysql56/bin:$PATH

# Postgres
# export POSTGRES_HOME=/opt/local/lib/postgresql94/

# Java
export JAVA_HOME="/Library/Java/JavaVirtualMachines/jdk1.8.0_72.jdk/Contents/Home"

# Maven
export PATH=/opt/apache-maven-3.3.9/bin:$PATH

# Vert.x 3
export PATH=/opt/vert.x-3.2.0-full/bin:$PATH

# Brew completion {{{
# if [ -f /path/to/brew-completion.sh ]; then
#    . /path/to/brew-completion.sh
# fi
# }}}

# Go lang
export GOPATH=$HOME/.go
export PATH=$GOPATH/bin:$PATH

# Rust
export PATH=$HOME/.cargo/bin:$PATH

# plenv
#export PATH="$HOME/.plenv/bin:$PATH"
#eval "$(plenv init -)"

[syohex]

Hmm, I cannot reproduce this issue with your .bash_profile(comment out plenv lines) on MacOSX bash 3.2.57.

[syohex]

I cannot reproduce this issue with it on Ubuntu bash 4.3.42 too.

[abra]

Something wrong with my vim, check out this video I recorded https://www.dropbox.com/s/3422zvsdvh3h0b2/bash_fork.mov?dl=0 Just noticed that vim causes the problem.

[abra]

Everything works fine until I run vim or macvim.

[abra]

I think I found the problem, these lines in my .vimrc somehow recursively fork plenv command

" ⌘ Q when :qa in MacVim
if has("unix")
    let s:uname = system("uname -s")
    if s:uname == "Darwin"
        autocmd VimLeave * macaction terminate:
    endif
endif

I removed them and everything works fine now.

[syohex]

Thanks for information. I'll try to reproduce and try to fix if feasible.

[abra]

I found one more cause of the problem in file ~/.vim/bundle/vim-perl/ftplubin/perl.vim when try open perl files:

" Set this once, globally.
if !exists("perlpath")
    if executable("perl")
      try
    if &shellxquote != '"'
        let perlpath = system('perl -e "print join(q/,/,@INC)"')
    else
        let perlpath = system("perl -e 'print join(q/,/,@INC)'")
    endif
    let perlpath = substitute(perlpath,',.$',',,','')
      catch /E145:/
    let perlpath = ".,,"
      endtry
    else
    " If we can't call perl to get its path, just default to using the
    " current directory and the directory of the current file.
    let perlpath = ".,,"
    endif
endif

[miyagawa]

It seems to me inside plenv init something is invoking bash which tries to initialize .bash_profile and that calls plenv init hence the infinite loop.

[syohex]

I cannot reproduce this issue with your vim configuration/setting and .bash_profile. I suppose this is your environment issue, not plenv.

[miyagawa]

@abra PLENV_DEBUG environment variable allows you to show the trace while executing plenv.

[abra]

I'm back. Link with result of PLENV_DEBUG.

[abra]

I've analysed my ~/.vimrc and found out that there are two lines which I forgot to remove earlier

let $BASH_ENV = ~/.bash_profile
set shell=/bin/bash

I've removed them and bash fork messages are gone.

[syohex]

:+1: