Segfault in a large Rails 2.3.x app on Ruby 1.9.3p125 (2012-02-16 revision 34643) [x86_64-linux]

[mrb]

Very excited about this project! I know you don't fully support 1.9.3 yet, but maybe this is a relatively minor fix?

/opt/src/paperlesspost/heap_dump/lib/heap_dump.rb:10: [BUG] Segmentation fault
ruby 1.9.3p125 (2012-02-16 revision 34643) [x86_64-linux]

-- Control frame information -----------------------------------------------
c:0031 p:---- s:0179 b:0179 l:000178 d:000178 CFUNC  :dump_ext
c:0030 p:0041 s:0175 b:0175 l:000174 d:000174 METHOD /opt/src/paperlesspost/heap_dump/lib/heap_dump.rb:10
c:0029 p:0020 s:0170 b:0170 l:000169 d:000169 METHOD /opt/src/paperlesspost/paperless-post/config/initializers/heap_dump.rb:12
c:0028 p:0106 s:0166 b:0166 l:000165 d:000165 METHOD /opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/sass-3.2.1/lib/sass/plugin/rack.rb:54
c:0027 p:0015 s:0162 b:0162 l:000161 d:000161 METHOD /opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/actionpack-2.3.14.pped08b10/lib/action_controller/string_co
c:0026 p:0015 s:0155 b:0155 l:000154 d:000154 METHOD /opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/rack-1.1.3/lib/rack/head.rb:9
c:0025 p:0155 s:0148 b:0148 l:000147 d:000147 METHOD /opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/rack-1.1.3/lib/rack/methodoverride.rb:24
c:0024 p:0046 s:0142 b:0142 l:000141 d:000141 METHOD /opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/actionpack-2.3.14.pped08b10/lib/action_controller/params_pa
c:0023 p:0027 s:0137 b:0137 l:000136 d:000136 METHOD /opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/actionpack-2.3.14.pped08b10/lib/action_controller/session/a
c:0022 p:0017 s:0126 b:0126 l:000125 d:000125 METHOD /opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/airbrake-3.1.2/lib/airbrake/rack.rb:42
c:0021 p:0015 s:0120 b:0120 l:000119 d:000119 METHOD /opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/actionpack-2.3.14.pped08b10/lib/action_controller/failsafe.
c:0020 p:0015 s:0115 b:0115 l:000114 d:000114 METHOD /opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/airbrake-3.1.2/lib/airbrake/user_informer.rb:12
c:0019 p:0014 s:0106 b:0106 l:000100 d:000105 BLOCK  /opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/rack-1.1.3/lib/rack/lock.rb:11
c:0018 p:0019 s:0104 b:0104 l:000103 d:000103 METHOD <internal:prelude>:10
c:0017 p:0054 s:0101 b:0101 l:000100 d:000100 METHOD /opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/rack-1.1.3/lib/rack/lock.rb:11
c:0016 p:0024 s:0096 b:0096 l:000086 d:000095 BLOCK  /opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/actionpack-2.3.14.pped08b10/lib/action_controller/dispatche
c:0015 p:0040 s:0094 b:0094 l:000093 d:000093 METHOD /opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/actionpack-2.3.14.pped08b10/lib/action_controller/reloader.
c:0014 p:0038 s:0087 b:0087 l:000086 d:000086 METHOD /opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/actionpack-2.3.14.pped08b10/lib/action_controller/dispatche
c:0013 p:0193 s:0083 b:0083 l:000082 d:000082 METHOD /opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/rails-2.3.14.pped08b10/lib/rails/rack/static.rb:31
c:0012 p:0167 s:0076 b:0076 l:000063 d:000075 BLOCK  /opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/rack-1.1.3/lib/rack/urlmap.rb:47
c:0011 p:---- s:0069 b:0069 l:000068 d:000068 FINISH
c:0010 p:---- s:0067 b:0067 l:000066 d:000066 CFUNC  :each
c:0009 p:0064 s:0064 b:0064 l:000063 d:000063 METHOD /opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/rack-1.1.3/lib/rack/urlmap.rb:41
c:0008 p:0015 s:0055 b:0055 l:000054 d:000054 METHOD /opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/rails-2.3.14.pped08b10/lib/rails/rack/log_tailer.rb:17
c:0007 p:0015 s:0050 b:0050 l:000049 d:000049 METHOD /opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/rack-1.1.3/lib/rack/content_length.rb:13
c:0006 p:0331 s:0042 b:0042 l:000041 d:000041 METHOD /opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/rack-1.1.3/lib/rack/handler/webrick.rb:48
c:0005 p:0257 s:0030 b:0030 l:000029 d:000029 METHOD /usr/lib64/ruby/1.9.1/webrick/httpserver.rb:138
c:0004 p:0393 s:0020 b:0020 l:000019 d:000019 METHOD /usr/lib64/ruby/1.9.1/webrick/httpserver.rb:94
c:0003 p:0126 s:0009 b:0009 l:0013f8 d:000008 BLOCK  /usr/lib64/ruby/1.9.1/webrick/server.rb:191
c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH
c:0001 p:---- s:0002 b:0002 l:000001 d:000001 TOP   

-- Ruby level backtrace information ----------------------------------------
/usr/lib64/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'
/usr/lib64/ruby/1.9.1/webrick/httpserver.rb:94:in `run'
/usr/lib64/ruby/1.9.1/webrick/httpserver.rb:138:in `service'
/opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/rack-1.1.3/lib/rack/handler/webrick.rb:48:in `service'
/opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/rack-1.1.3/lib/rack/content_length.rb:13:in `call'
/opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/rails-2.3.14.pped08b10/lib/rails/rack/log_tailer.rb:17:in `call'
/opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/rack-1.1.3/lib/rack/urlmap.rb:41:in `call'
/opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/rack-1.1.3/lib/rack/urlmap.rb:41:in `each'
/opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/rack-1.1.3/lib/rack/urlmap.rb:47:in `block in call'
/opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/rails-2.3.14.pped08b10/lib/rails/rack/static.rb:31:in `call'
/opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/actionpack-2.3.14.pped08b10/lib/action_controller/dispatcher.rb:108:in `call'
/opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/actionpack-2.3.14.pped08b10/lib/action_controller/reloader.rb:34:in `run'
/opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/actionpack-2.3.14.pped08b10/lib/action_controller/dispatcher.rb:114:in `block in call'
/opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/rack-1.1.3/lib/rack/lock.rb:11:in `call'
<internal:prelude>:10:in `synchronize'
/opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/rack-1.1.3/lib/rack/lock.rb:11:in `block in call'
/opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/airbrake-3.1.2/lib/airbrake/user_informer.rb:12:in `call'
/opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/actionpack-2.3.14.pped08b10/lib/action_controller/failsafe.rb:26:in `call'
/opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/airbrake-3.1.2/lib/airbrake/rack.rb:42:in `call'
/opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/actionpack-2.3.14.pped08b10/lib/action_controller/session/abstract_store.rb:177:in `call'
/opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/actionpack-2.3.14.pped08b10/lib/action_controller/params_parser.rb:15:in `call'
/opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/rack-1.1.3/lib/rack/methodoverride.rb:24:in `call'
/opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/rack-1.1.3/lib/rack/head.rb:9:in `call'
/opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/actionpack-2.3.14.pped08b10/lib/action_controller/string_coercion.rb:25:in `call'
/opt/src/paperlesspost/paperless-post/vendor/bundle/ruby/1.9.1/gems/sass-3.2.1/lib/sass/plugin/rack.rb:54:in `call'
/opt/src/paperlesspost/paperless-post/config/initializers/heap_dump.rb:12:in `call'
/opt/src/paperlesspost/heap_dump/lib/heap_dump.rb:10:in `dump'
/opt/src/paperlesspost/heap_dump/lib/heap_dump.rb:10:in `dump_ext'

-- C level backtrace information -------------------------------------------
/usr/lib64/libruby.so.1.9(+0x150f22) [0x7fccaedabf22] vm_dump.c:796
/usr/lib64/libruby.so.1.9(+0x57566) [0x7fccaecb2566] error.c:258
/usr/lib64/libruby.so.1.9(rb_bug+0xb8) [0x7fccaecb26d8] error.c:277
/usr/lib64/libruby.so.1.9(+0xef075) [0x7fccaed4a075] signal.c:609
/lib64/libpthread.so.0(+0xf500) [0x7fccaea4d500]
/opt/src/paperlesspost/heap_dump/lib/heap_dump.so(+0x4840) [0x7fcca01dd840] ../../../../ext/heap_dump/heap_dump.c:1422
/opt/src/paperlesspost/heap_dump/lib/heap_dump.so(heapdump_dump+0xc1) [0x7fcca01dda01] ../../../../ext/heap_dump/heap_dump.c:1490
/opt/src/paperlesspost/heap_dump/lib/heap_dump.so(+0x4b06) [0x7fcca01ddb06] ../../../../ext/heap_dump/heap_dump.c:1536
/usr/lib64/libruby.so.1.9(+0x13ff1b) [0x7fccaed9af1b] vm_insnhelper.c:404
/usr/lib64/libruby.so.1.9(+0x142720) [0x7fccaed9d720] insns.def:1015
/usr/lib64/libruby.so.1.9(+0x147319) [0x7fccaeda2319] vm.c:1220
/usr/lib64/libruby.so.1.9(rb_yield+0x248) [0x7fccaeda9248] vm.c:624
/usr/lib64/libruby.so.1.9(rb_ary_each+0x57) [0x7fccaec85cd7] array.c:1478
/usr/lib64/libruby.so.1.9(+0x13ff1b) [0x7fccaed9af1b] vm_insnhelper.c:404
/usr/lib64/libruby.so.1.9(+0x142720) [0x7fccaed9d720] insns.def:1015
/usr/lib64/libruby.so.1.9(+0x147319) [0x7fccaeda2319] vm.c:1220
/usr/lib64/libruby.so.1.9(+0x148b03) [0x7fccaeda3b03] vm.c:624
/usr/lib64/libruby.so.1.9(+0x156d08) [0x7fccaedb1d08] thread.c:453
/usr/lib64/libruby.so.1.9(+0x156d60) [0x7fccaedb1d60] thread_pthread.c:653
/lib64/libpthread.so.0(+0x7851) [0x7fccaea45851]
/lib64/libc.so.6(clone+0x6d) [0x7fccadecc11d] regparse.c:3041

-- Other runtime information -----------------------------------------------

[Vasfed]

Does it crash every time or only occasionally? What's content of config/initializers/heap_dump.rb?

[mrb]

@Vasfed It crashes every time. I first caused a segfault while attaching with gdb, and then tried it in Ruby to see if there was any difference.

config/initializers/heap_dump.rb is just an empty class that calls HeapDump.dump

I can provide you with the full output for the crash in either context (gdb or within Rails) if you want, let me know.

[Vasfed]

Found some 1.9.3-specific segfault, but unsure if it's the cause of subj, please test against current head (if using bundler - gem 'heap_dump', git:'git://github.com/Vasfed/heap_dump.git', if not using - suggest doing so, http://gembundler.com/rails23.html)

[mrb]

@Vasfed You got it! Thanks a ton. Closing issue.

[Vasfed]

Released v0.0.27 with this fix

[mrb]

@Vasfed :+1: Awesome. I can't tell you how helpful this is going to be for me.

[Vasfed]

@mrb You're welcome. I haven't used it for rails yet, but had for cramp-based - had 2 actions in actual production app, one that runs dump, other - just counts instances of the app's namespace objects (some version of it may be coming in heapdump).

Feel free to share your ideas about making heapdump more handy

[mrb]

@Vasfed Awesome, will do. We'll likely add a protected/authenticated conditional route in our app that let's us run a heap dump when we need it.