here comes a new one:

#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7d667a2 in sem_post@GLIBC_2.0 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xacee555d in ?? () from /usr/lib/flashplugin-nonfree/libflashplayer.so
#3  0xb522738e in ?? () from /usr/lib/libasound.so.2
#4  0x09fbd7d8 in ?? ()
#5  0x00000001 in ?? ()
#6  0xb52bcc98 in ?? () from /usr/lib/libasound.so.2
#7  0xb6fa60d8 in ?? ()
#8  0x03e7fc18 in ?? ()
#9  0xb779cff4 in ?? () from /lib/tls/i686/cmov/libc.so.6
#10 0xb6fa60a8 in ?? ()
#11 <signal handler called>
#12 0xffffe410 in __kernel_vsyscall ()
#13 0xb7725893 in poll () from /lib/tls/i686/cmov/libc.so.6
#14 0xb7d94c39 in PR_Poll (pds=0x80df408, npds=2, timeout=65535000) at ptio.c:3877
#15 0xb70916db in nsSocketTransportService::Poll (this=0x80def20, interval=0xb6fa6368)
    at nsSocketTransportService2.cpp:361
#16 0xb7091f15 in nsSocketTransportService::Run (this=0x80def20) at nsSocketTransportService2.cpp:577
#17 0xb7e351cb in nsThread::Main (arg=0x80d2f60) at nsThread.cpp:118
#18 0xb7d98ead in _pt_root (arg=0x80d2fe0) at ptthread.c:220
#19 0xb7d6031b in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#20 0xb772f57e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 8 (process 9449):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7d6484c in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb7d920a3 in pt_TimedWait (cv=0x8086624, ml=0x8082658, timeout=<value optimized out>) at ptsynch.c:280
#3  0xb7d92ee1 in PR_WaitCondVar (cvar=0x8086620, timeout=246) at ptsynch.c:407
#4  0xb7e374c6 in TimerThread::Run (this=0x8086560) at TimerThread.cpp:318
#5  0xb7e351cb in nsThread::Main (arg=0x816f350) at nsThread.cpp:118
#6  0xb7d98ead in _pt_root (arg=0x8178f40) at ptthread.c:220
#7  0xb7d6031b in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#8  0xb772f57e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 7 (process 9457):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7d6484c in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb7d920a3 in pt_TimedWait (cv=0x84a89a4, ml=0x8310b88, timeout=<value optimized out>) at ptsynch.c:280
#3  0xb7d92ee1 in PR_WaitCondVar (cvar=0x84a89a0, timeout=250) at ptsynch.c:407
#4  0xb1afd1f7 in nsSSLThread::Run (this=0x84a20c8) at nsSSLThread.cpp:879
#5  0xb1afc300 in nsPSMBackgroundThread::nsThreadRunner (arg=0x84a20c8) at nsPSMBackgroundThread.cpp:44
#6  0xb7d98ead in _pt_root (arg=0x849f168) at ptthread.c:220
#7  0xb7d6031b in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#8  0xb772f57e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 6 (process 9458):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7d6484c in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb7d920a3 in pt_TimedWait (cv=0x849bba4, ml=0x83baa90, timeout=<value optimized out>) at ptsynch.c:280
#3  0xb7d92ee1 in PR_WaitCondVar (cvar=0x849bba0, timeout=250) at ptsynch.c:407
#4  0xb1afdf80 in nsCertVerificationThread::Run (this=0x853b5a0) at nsCertVerificationThread.cpp:142
#5  0xb1afc300 in nsPSMBackgroundThread::nsThreadRunner (arg=0x853b5a0) at nsPSMBackgroundThread.cpp:44
#6  0xb7d98ead in _pt_root (arg=0x84815d8) at ptthread.c:220
#7  0xb7d6031b in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#8  0xb772f57e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 5 (process 9485):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7d645c6 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb7d92f71 in PR_WaitCondVar (cvar=0x8355148, timeout=4294967295) at ptsynch.c:405
#3  0xaf029e0d in ProcessAsyncMessages () at mozStorageAsyncIO.cpp:1525
#4  0xaf02aee9 in AsyncWriteThread::Run (this=0x8355188) at mozStorageAsyncIO.cpp:471
#5  0xb7e351cb in nsThread::Main (arg=0x8355198) at nsThread.cpp:118
#6  0xb7d98ead in _pt_root (arg=0x8355218) at ptthread.c:220
#7  0xb7d6031b in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#8  0xb772f57e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 4 (process 9500):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7d645c6 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb7d92f71 in PR_WaitCondVar (cvar=0x9112f18, timeout=4294967295) at ptsynch.c:405
#3  0xb7d92fd7 in PR_Wait (mon=0x9112f58, timeout=4294967295) at ptsynch.c:584
#4  0xb7e31331 in PL_WaitForEvent (self=0x9112ee8) at plevent.c:808
#5  0xb7e32c09 in nsEventQueueImpl::WaitForEvent (this=0x9112ec0, aResult=0xae022380) at nsEventQueue.cpp:498
#6  0xb6662b05 in EventLoop (arg=0x0) at nsUrlClassifierDBService.cpp:1142
#7  0xb7d98ead in _pt_root (arg=0x90050f8) at ptthread.c:220
#8  0xb7d6031b in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#9  0xb772f57e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 3 (process 9516):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7d665ce in sem_wait@GLIBC_2.0 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xacee63c8 in ?? () from /usr/lib/flashplugin-nonfree/libflashplayer.so
#3  0xb7d6031b in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#4  0xb772f57e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 2 (process 4850):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7d6484c in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb7d920a3 in pt_TimedWait (cv=0x80dfddc, ml=0x80dfd78, timeout=<value optimized out>) at ptsynch.c:280
#3  0xb7d92ee1 in PR_WaitCondVar (cvar=0x80dfdd8, timeout=60000) at ptsynch.c:407
#4  0xb709d7a7 in nsHostResolver::GetHostToLookup (this=0x80dfd18, result=0xa7d17388)
    at nsHostResolver.cpp:556
#5  0xb709dc44 in nsHostResolver::ThreadFunc (arg=0x80dfd18) at nsHostResolver.cpp:641
#6  0xb7d98ead in _pt_root (arg=0x9e8dd58) at ptthread.c:220
#7  0xb7d6031b in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#8  0xb772f57e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (process 9445):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7d684f1 in raise () from /lib/tls/i686/cmov/libpthread.so.0
#2  0x08057836 in nsProfileLock::FatalSignalHandler (signo=-1210650636) at nsProfileLock.cpp:206
#3  <signal handler called>
#4  0xb7c5bd11 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#5  0x082aa790 in ?? ()
#6  0x00000030 in ?? ()
#7  0x00000000 in ?? ()