Comment 34 for bug 556829

Confirming. This happens to me several times a day.

Here is my gdb bt:
#0 nsQueryInterface::operator() (this=<value optimised out>, aIID=..., answer=0x7fffffffd208) at nsCOMPtr.cpp:47
#1 0x00007ffff7480c72 in nsCOMPtr_base::assign_from_qi (this=0x7fffffffd250, qi=..., iid=...) at nsCOMPtr.cpp:96
#2 0x0000000000c8f4ed in nsCOMPtr (this=0x7fffe7e9e740, url=<value optimised out>, exitCode=<value optimised out>) at ../../../mozilla/dist/include/xpcom/nsCOMPtr.h:572
#3 nsImapIncomingServer::OnStopRunningUrl (this=0x7fffe7e9e740, url=<value optimised out>, exitCode=<value optimised out>) at nsImapIncomingServer.cpp:2353
#4 0x0000000000d596c8 in nsMsgMailNewsUrl::SetUrlState (this=0x7fffd806cc08, aRunningUrl=<value optimised out>, aExitCode=0) at nsMsgMailNewsUrl.cpp:135
#5 0x0000000000c978c3 in nsImapMailFolder::SetUrlState (this=0x7fffe4c43800, aProtocol=0x7fffd81ce000, aUrl=0x7fffd806cc08, isRunning=0, statusCode=0)
    at nsImapMailFolder.cpp:6609
#6 0x00007ffff74baa05 in NS_InvokeByIndex_P (that=0x8000007f, methodIndex=17506960, paramCount=4294955528, params=0x1) at xptcinvoke_x86_64_linux.cpp:208
#7 0x00007ffff74b3a17 in nsProxyObjectCallInfo::Run (this=0x7fffd3703200) at nsProxyEvent.cpp:181
#8 0x00007ffff74afc4b in nsThread::ProcessNextEvent (this=0x7fffed23d9d0, mayWait=1, result=0x7fffffffd4fc) at nsThread.cpp:521
#9 0x00007ffff7484f3c in NS_ProcessNextEvent_P (thread=0x8000007f, mayWait=17506960) at nsThreadUtils.cpp:247
#10 0x000000000060e133 in nsBaseAppShell::Run (this=0x7fffe7a5d3a0) at nsBaseAppShell.cpp:170
#11 0x0000000000b38640 in nsAppStartup::Run (this=0x7fffe7a98640) at nsAppStartup.cpp:193
#12 0x0000000000449c72 in XRE_main (argc=<value optimised out>, argv=<value optimised out>, aAppData=<value optimised out>) at nsAppRunner.cpp:3321
#13 0x0000000000445690 in main (argc=1, argv=0x7fffffffdcf8) at nsMailApp.cpp:103