Fwd: [Bug 784193] Thunderbird leaks threads

Any thoughts?


-------- Original Message --------
Subject: [Bug 784193] Thunderbird leaks threads
Date: Thu, 31 Jan 2013 10:10:04 +0000
From: [email protected]
To: [email protected]

Product: Fedora
https://bugzilla.redhat.com/show_bug.cgi?id=784193

Tom Hughes <[email protected]> changed:

            What    |Removed                     |Added
----------------------------------------------------------------------------
                  CC|                            |[email protected]
           Component|thunderbird                 |thunderbird-lightning
            Assignee|[email protected]         |[email protected]

--- Comment #7 from Tom Hughes <[email protected]> ---
After further investigation I have discovered that disabling the lightning
extension stops the thread leak, so it seems that lightning is actually
responsible and I am going to transfer this bug to the thunderbird-lightning
component.

I have also done some comparisons of the collected stack traces, and it seems
that all the leaked threads look like this:

#0  pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:165
#1  0x0000003916e23ab0 in PR_WaitCondVar (cvar=0x7f5d1d1b03c0,
timeout=4294967295) at ../../../mozilla/nsprpub/pr/src/pthreads/ptsynch.c:385
#2  0x0000003916e23db5 in PR_Wait (mon=0x7f5d24431c80, timeout=<optimized out>)
at ../../../mozilla/nsprpub/pr/src/pthreads/ptsynch.c:582
#3  0x00007f5d36155b9d in Wait (interval=4294967295, this=0x7f5d244fa390) at
../../dist/include/mozilla/ReentrantMonitor.h:89
#4  Wait (interval=4294967295, this=<synthetic pointer>) at
../../dist/include/mozilla/ReentrantMonitor.h:192
#5  nsEventQueue::GetEvent (this=0x7f5d244fa390, mayWait=true,
result=0x7f5d1d0fedf8) at
/usr/src/debug/thunderbird-17.0.2/comm-release/mozilla/xpcom/threads/nsEventQueue.cpp:51
#6  0x00007f5d36156878 in nsThread::ProcessNextEvent (this=0x7f5d244fa340,
mayWait=true, result=0x7f5d1d0fee3f) at
/usr/src/debug/thunderbird-17.0.2/comm-release/mozilla/xpcom/threads/nsThread.cpp:605
#7  0x00007f5d3612c82b in NS_ProcessNextEvent_P (thread=<optimized out>,
mayWait=true) at
/usr/src/debug/thunderbird-17.0.2/comm-release/objdir/mozilla/xpcom/build/nsThreadUtils.cpp:220
#8  0x00007f5d36157080 in nsThread::ThreadFunc (arg=Python Exception <class
'gdb.error'> Attempt to dereference a generic pointer.: 0x7f5d244fa340) at
/usr/src/debug/thunderbird-17.0.2/comm-release/mozilla/xpcom/threads/nsThread.cpp:257
#9  0x0000003916e28e23 in _pt_root (arg=Python Exception <class 'gdb.error'>
Attempt to dereference a generic pointer.: 0x7f5d24867570) at
../../../mozilla/nsprpub/pr/src/pthreads/ptthread.c:156
#10 0x0000003909207d15 in start_thread (arg=Python Exception <class
'gdb.error'> Attempt to dereference a generic pointer.: 0x7f5d1d0ff700) at
pthread_create.c:308
#11 0x0000003908af246d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:114

Unfortunately that looks pretty generic to me and hence probably doesn't give
much clue as to the cause of the leak.

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