From: Lucas Nussbaum <redmine@...>
Date: 2010-03-07T02:25:59+09:00
Subject: [ruby-core:28535] [Bug #2739] ruby 1.8.7 built with pthreads hangs under some circumstances

Issue #2739 has been updated by Lucas Nussbaum.


Ruby is compiled with pthreads enabled on Ubuntu (and Debian), so there are several PIDs of interest here.

Backtraces for the parent PID:
#0  0x00007f508e929c73 in select () from /lib/libc.so.6
#1  0x00007f508f6f2893 in rb_thread_schedule ()
   from /usr/lib/libruby1.8.so.1.8
#2  0x00007f508f709a3c in ?? () from /usr/lib/libruby1.8.so.1.8
#3  0x00007f508f70e6d3 in ?? () from /usr/lib/libruby1.8.so.1.8
#4  0x00007f508f6ef6c1 in ?? () from /usr/lib/libruby1.8.so.1.8
#5  0x00007f508f6ef8b3 in ?? () from /usr/lib/libruby1.8.so.1.8
#6  0x00007f508f6f0578 in ?? () from /usr/lib/libruby1.8.so.1.8
#7  0x00007f508f6f0825 in rb_funcall () from /usr/lib/libruby1.8.so.1.8
#8  0x00007f508f6ebd7d in ?? () from /usr/lib/libruby1.8.so.1.8
#9  0x00007f508f6ed9f7 in ?? () from /usr/lib/libruby1.8.so.1.8
#10 0x00007f508f6e9dea in ?? () from /usr/lib/libruby1.8.so.1.8
#11 0x00007f508f6ecb81 in ?? () from /usr/lib/libruby1.8.so.1.8
#12 0x00007f508f6ecc5b in ?? () from /usr/lib/libruby1.8.so.1.8
#13 0x00007f508f6ef573 in ?? () from /usr/lib/libruby1.8.so.1.8
#14 0x00007f508f6ef8b3 in ?? () from /usr/lib/libruby1.8.so.1.8
#15 0x00007f508f6ec721 in ?? () from /usr/lib/libruby1.8.so.1.8
#16 0x00007f508f6ed066 in ?? () from /usr/lib/libruby1.8.so.1.8
#17 0x00007f508f6ea2f6 in ?? () from /usr/lib/libruby1.8.so.1.8
#18 0x00007f508f6fc85b in ?? () from /usr/lib/libruby1.8.so.1.8
#19 0x00007f508f6fc8a5 in ruby_exec () from /usr/lib/libruby1.8.so.1.8
#20 0x00007f508f6fc8d5 in ruby_run () from /usr/lib/libruby1.8.so.1.8
#21 0x0000000000400911 in main ()

Backtrace for the child PID:
#0  0x00007f508f4a2474 in __lll_lock_wait () from /lib/libpthread.so.0
#1  0x00007f508f4a00c1 in pthread_cond_signal@@GLIBC_2.3.2 ()
   from /lib/libpthread.so.0
#2  0x00007f508f6e5e8e in rb_thread_stop_timer ()
   from /usr/lib/libruby1.8.so.1.8
#3  0x00007f508e8f5416 in fork () from /lib/libc.so.6
#4  0x00007f508f70cd20 in ?? () from /usr/lib/libruby1.8.so.1.8
#5  0x00007f508f70e691 in ?? () from /usr/lib/libruby1.8.so.1.8
#6  0x00007f508f6ef6c1 in ?? () from /usr/lib/libruby1.8.so.1.8
#7  0x00007f508f6ef8b3 in ?? () from /usr/lib/libruby1.8.so.1.8
#8  0x00007f508f6f0578 in ?? () from /usr/lib/libruby1.8.so.1.8
#9  0x00007f508f6f0825 in rb_funcall () from /usr/lib/libruby1.8.so.1.8
#10 0x00007f508f6ebd7d in ?? () from /usr/lib/libruby1.8.so.1.8
#11 0x00007f508f6ed9f7 in ?? () from /usr/lib/libruby1.8.so.1.8
#12 0x00007f508f6e9dea in ?? () from /usr/lib/libruby1.8.so.1.8
#13 0x00007f508f6ecb81 in ?? () from /usr/lib/libruby1.8.so.1.8
#14 0x00007f508f6ecc5b in ?? () from /usr/lib/libruby1.8.so.1.8
#15 0x00007f508f6ef573 in ?? () from /usr/lib/libruby1.8.so.1.8
#16 0x00007f508f6ef8b3 in ?? () from /usr/lib/libruby1.8.so.1.8
#17 0x00007f508f6ec721 in ?? () from /usr/lib/libruby1.8.so.1.8
#18 0x00007f508f6ed066 in ?? () from /usr/lib/libruby1.8.so.1.8
#19 0x00007f508f6ea2f6 in ?? () from /usr/lib/libruby1.8.so.1.8
#20 0x00007f508f6fc85b in ?? () from /usr/lib/libruby1.8.so.1.8
#21 0x00007f508f6fc8a5 in ruby_exec () from /usr/lib/libruby1.8.so.1.8
#22 0x00007f508f6fc8d5 in ruby_run () from /usr/lib/libruby1.8.so.1.8
#23 0x0000000000400911 in main ()

I could easily provide you with an Ubuntu lucid chroot (as a tarball) so you can reproduce the issue. I'd just need to use the CPU architecture that you use (i386, amd64?)
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http://redmine.ruby-lang.org/issues/show/2739

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