Issue #8996 has been reported by stevegoobermanhill (stephen gooberman-hill).

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Bug #8996: pthread_mutex_lock EINVAL
https://bugs.ruby-lang.org/issues/8996

Author: stevegoobermanhill (stephen gooberman-hill)
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 
ruby -v: ruby 2.0.0p195 (2013-05-14 revision 40734) [x86_64-linux]
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN


ruby crashes leaving a stacktrace. . Cause is pthread_mutex_lock EINVAL

Based on the ruby source line where the problem happens (line 121 below) 

  119 def stop
  120       if @tcpServerThread
  121         @tcpServerThread.raise StandardError,"stop"
  122      end
  123 end

I suspect that the problem is there is a kind of race condition where @tcpServerThread has actually been destroyed (or is in the process of being destroyed) between lines 120 and 121. I am guessing that this results in thread_pthread.c (line 212 where the error occurs) checking that the pthread_mutex is either available or in EBUSY state, and throwing an error when it is not.

I'm not sure how one would solve it though...

Kind regards

Steve

top of the control frame information
-- Control frame information -----------------------------------------------
c:0032 p:---- s:0133 e:000132 CFUNC  :raise
c:0031 p:0025 s:0128 e:000127 METHOD /home/steve/git/trident/lib/rmodbus/genserver.rb:121
c:0030 p:0008 s:0125 e:000124 METHOD /home/steve/git/trident/lib/db_client/data_cache_server.rb:344
c:0029 p:0014 s:0122 e:000121 METHOD /home/steve/git/trident/lib/rmodbus/genserver.rb:138
c:0028 p:0008 s:0119 e:000118 METHOD /home/steve/git/trident/lib/db_client/data_cache_server.rb:350
c:0027 p:0007 s:0116 e:000115 METHOD /home/steve/git/trident/lib/rmodbus/genserver.rb:142
c:0026 p:0030 s:0113 e:000112 METHOD /home/steve/git/trident/test/interface/test_stats_reporter.rb:114
c:0025 p:0009 s:0110 e:000109 LAMBDA /home/steve/.rvm/rubies/ruby-2.0.0-p195/lib/ruby/gems/2.0.0/gems/test-unit-2.5.5/lib/test/unit/fixture.rb:202 [FINISH]


-- C level backtrace information -------------------------------------------
/home/steve/.rvm/rubies/ruby-2.0.0-p195/lib/libruby.so.2.0(+0x1b04d8) [0x7f7d677324d8] vm_dump.c:647
/home/steve/.rvm/rubies/ruby-2.0.0-p195/lib/libruby.so.2.0(+0x6a317) [0x7f7d675ec317] error.c:283
/home/steve/.rvm/rubies/ruby-2.0.0-p195/lib/libruby.so.2.0(rb_bug+0xb3) [0x7f7d675ed063] error.c:302
/home/steve/.rvm/rubies/ruby-2.0.0-p195/lib/libruby.so.2.0(rb_bug_errno+0x3a) [0x7f7d675ed0aa] error.c:320
/home/steve/.rvm/rubies/ruby-2.0.0-p195/lib/libruby.so.2.0(+0x1bac7a) [0x7f7d6773cc7a] thread_pthread.c:212
/home/steve/.rvm/rubies/ruby-2.0.0-p195/lib/libruby.so.2.0(+0x19a7cf) [0x7f7d6771c7cf] vm_insnhelper.c:1469
/home/steve/.rvm/rubies/ruby-2.0.0-p195/lib/libruby.so.2.0(+0x19f29a) [0x7f7d6772129a] insns.def:1017
/home/steve/.rvm/rubies/ruby-2.0.0-p195/lib/libruby.so.2.0(+0x1a375a) [0x7f7d6772575a] vm.c:1201
/home/steve/.rvm/rubies/ruby-2.0.0-p195/lib/libruby.so.2.0(+0x1a475e) [0x7f7d6772675e] vm.c:696
/home/steve/.rvm/rubies/ruby-2.0.0-p195/lib/libruby.so.2.0(+0x1a479a) [0x7f7d6772679a] vm.c:715
/home/steve/.rvm/rubies/ruby-2.0.0-p195/lib/libruby.so.2.0(+0x7939d) [0x7f7d675fb39d] proc.c:578
/home/steve/.rvm/rubies/ruby-2.0.0-p195/lib/libruby.so.2.0(+0x19a7cf) [0x7f7d6771c7cf] vm_insnhelper.c:1469
/home/steve/.rvm/rubies/ruby-2.0.0-p195/lib/libruby.so.2.0(+0x19f29a) [0x7f7d6772129a] insns.def:1017
/home/steve/.rvm/rubies/ruby-2.0.0-p195/lib/libruby.so.2.0(+0x1a375a) [0x7f7d6772575a] vm.c:1201
/home/steve/.rvm/rubies/ruby-2.0.0-p195/lib/libruby.so.2.0(rb_yield+0x190) [0x7f7d6772c4a0] vm.c:648
/home/steve/.rvm/rubies/ruby-2.0.0-p195/lib/libruby.so.2.0(rb_ary_each+0x52) [0x7f7d675b2382] array.c:1678
/home/steve/.rvm/rubies/ruby-2.0.0-p195/lib/libruby.so.2.0(+0x19a7cf) [0x7f7d6771c7cf] vm_insnhelper.c:1469
/home/steve/.rvm/rubies/ruby-2.0.0-p195/lib/libruby.so.2.0(+0x19f22b) [0x7f7d6772122b] insns.def:1002
/home/steve/.rvm/rubies/ruby-2.0.0-p195/lib/libruby.so.2.0(+0x1a375a) [0x7f7d6772575a] vm.c:1201
/home/steve/.rvm/rubies/ruby-2.0.0-p195/lib/libruby.so.2.0(+0x1a475e) [0x7f7d6772675e] vm.c:696
/home/steve/.rvm/rubies/ruby-2.0.0-p195/lib/libruby.so.2.0(+0x1a479a) [0x7f7d6772679a] vm.c:715
/home/steve/.rvm/rubies/ruby-2.0.0-p195/lib/libruby.so.2.0(rb_proc_call+0x42) [0x7f7d675fbea2] proc.c:603
/home/steve/.rvm/rubies/ruby-2.0.0-p195/lib/libruby.so.2.0(rb_exec_end_proc+0x1f1) [0x7f7d675f5be1] eval_jump.c:129
/home/steve/.rvm/rubies/ruby-2.0.0-p195/lib/libruby.so.2.0(+0x73c9a) [0x7f7d675f5c9a] eval.c:118
/home/steve/.rvm/rubies/ruby-2.0.0-p195/lib/libruby.so.2.0(ruby_cleanup+0x132) [0x7f7d675f5e12] eval.c:176
/home/steve/.rvm/rubies/ruby-2.0.0-p195/lib/libruby.so.2.0(ruby_run_node+0x23) [0x7f7d675f60f3] eval.c:307
/home/steve/.rvm/rubies/ruby-2.0.0-p195/bin/ruby() [0x40089b] main.c:36
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5) [0x7f7d671dbea5]


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