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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