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[Mauro S <775374@xxxxxxxxxxxxxxxxxx>]

Fixed in eglibc-2.12

** Changed in: eglibc (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/775374

Title:
  pthread_exit() causes pthread_join() hang when library destructor
  called

Status in eglibc package in Ubuntu:
  Fix Released

Bug description:
  Binary package hint: libc6

  Hello,

  I have a simple program that loads and then unloads a shared object.
  Source code attached.

  Shared object constructor launchs a joinable thread, that terminates with pthread_exit() call.
  Shared object destructor contains pthread_join() call. When I call destructor, pthread_join() hangs. This behavior disappears if I substitute pthread_exit() with a return.

  Here the gdb trace:
  (gdb) info threads
    2 Thread 0xb7fefb70 (LWP 1134)  0x0012d422 in __kernel_vsyscall ()
  * 1 Thread 0xb7ff06c0 (LWP 1131)  0x0012d422 in __kernel_vsyscall ()

  (gdb) bt
  #0  0x0012d422 in __kernel_vsyscall ()
  #1  0x00138b5d in pthread_join () from /lib/tls/i686/cmov/libpthread.so.0
  #2  0x002a57a4 in TestModExit () at TestMod.c:49
  #3  0x002a5678 in __do_global_dtors_aux () from ./libTestMod.so
  #4  0x002a5810 in _fini () from ./libTestMod.so
  #5  0x0012273e in ?? () from /lib/ld-linux.so.2
  #6  0x001231b7 in ?? () from /lib/ld-linux.so.2
  #7  0x0012eca4 in ?? () from /lib/tls/i686/cmov/libdl.so.2
  #8  0x0011d7e6 in ?? () from /lib/ld-linux.so.2
  #9  0x0012f09c in ?? () from /lib/tls/i686/cmov/libdl.so.2
  #10 0x0012ecda in dlclose () from /lib/tls/i686/cmov/libdl.so.2
  #11 0x08048549 in main (argc=1, argv=0xbffff874) at main.c:15

  (gdb) thread 2
  [Switching to thread 2 (Thread 0xb7fefb70 (LWP 1134))]#0  0x0012d422 in __kernel_vsyscall ()

  (gdb) bt
  #0  0x0012d422 in __kernel_vsyscall ()
  #1  0x0013eaf9 in __lll_lock_wait () from /lib/tls/i686/cmov/libpthread.so.0
  #2  0x0013a149 in _L_lock_839 () from /lib/tls/i686/cmov/libpthread.so.0
  #3  0x00139fdb in pthread_mutex_lock () from /lib/tls/i686/cmov/libpthread.so.0
  #4  0x0012157d in ?? () from /lib/ld-linux.so.2
  #5  0x0024f4a2 in ?? () from /lib/tls/i686/cmov/libc.so.6
  #6  0x0011d7e6 in ?? () from /lib/ld-linux.so.2
  #7  0x0024f5a1 in ?? () from /lib/tls/i686/cmov/libc.so.6
  #8  0x0024f6bb in __libc_dlopen_mode () from /lib/tls/i686/cmov/libc.so.6
  #9  0x00140b47 in pthread_cancel_init () from /lib/tls/i686/cmov/libpthread.so.0
  #10 0x00140cbd in _Unwind_ForcedUnwind () from /lib/tls/i686/cmov/libpthread.so.0
  #11 0x0013e788 in __pthread_unwind () from /lib/tls/i686/cmov/libpthread.so.0
  #12 0x001389e0 in pthread_exit () from /lib/tls/i686/cmov/libpthread.so.0
  #13 0x002a5719 in MyThreadFun (arg=0x0) at TestMod.c:25
  #14 0x0013796e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
  #15 0x00218a4e in clone () from /lib/tls/i686/cmov/libc.so.6

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