542147 - e10s: Assertion (WorkerLoop == MessageLoop::current()) fails after content process dies

Status: RESOLVED WORKSFORME

(Core :: IPC, defect)

Description

[Josh Matthews [:jdm]]

I'm creating multiple content processes in my Jetpack work (just make the constructor public, store the parent in the frameloader and delete it on destruction), and I run into this assertion failure after three processes have died:

###!!! ABORT: not on worker thread!: 'mWorkerLoop == MessageLoop::current()', file ../../dist/include/mozilla/ipc/AsyncChannel.h, line 130
Program received signal SIGTRAP, Trace/breakpoint trap.
[Switching to Thread 0xb4df7710 (LWP 24392)]
RealBreak () at /home/jdm/electrolysis/xpcom/base/nsDebugImpl.cpp:421
421	}

(gdb) bt
#0  RealBreak () at /home/jdm/electrolysis/xpcom/base/nsDebugImpl.cpp:421
#1  0xb780068c in NS_DebugBreak_P (aSeverity=3, aStr=0xb7d5a4d2 "not on worker thread!", aExpr=0xb7d5a4ac "mWorkerLoop == MessageLoop::current()", 
    aFile=0xb7d5a448 "../../dist/include/mozilla/ipc/AsyncChannel.h", aLine=130) at /home/jdm/electrolysis/xpcom/base/nsDebugImpl.cpp:324
#2  0xb76343cd in mozilla::ipc::AsyncChannel::AssertWorkerThread (this=0xacacfc88) at ../../dist/include/mozilla/ipc/AsyncChannel.h:129
#3  0xb7639871 in mozilla::ipc::RPCChannel::OnMaybeDequeueOne (this=0xacacfc88) at /home/jdm/electrolysis/ipc/glue/RPCChannel.cpp:273
#4  0xb763b0bd in DispatchToMethod<mozilla::ipc::RPCChannel, void (mozilla::ipc::RPCChannel::*)()> (obj=0xacacfc88, 
    method=0xb7639854 <mozilla::ipc::RPCChannel::OnMaybeDequeueOne()>, arg=@0xabb0dfdc) at /home/jdm/electrolysis/ipc/chromium/src/base/tuple.h:383
#5  0xb763b0f9 in RunnableMethod<mozilla::ipc::RPCChannel, void (mozilla::ipc::RPCChannel::*)(), Tuple0>::Run (this=0xabb0dfc0)
    at /home/jdm/electrolysis/ipc/chromium/src/base/task.h:307
#6  0xb76feb14 in MessageLoop::RunTask (this=0xb4b2a6e0, task=0xabb0dfc0) at /home/jdm/electrolysis/ipc/chromium/src/base/message_loop.cc:326
#7  0xb76fefad in MessageLoop::DeferOrRunPendingTask (this=0xb4b2a6e0, pending_task=@0xbfda5650)
    at /home/jdm/electrolysis/ipc/chromium/src/base/message_loop.cc:334
#8  0xb76ff32c in MessageLoop::DoWork (this=0xb4b2a6e0) at /home/jdm/electrolysis/ipc/chromium/src/base/message_loop.cc:434
#9  0xb7637f7e in mozilla::ipc::MessagePump::Run (this=0xb4b76790, aDelegate=0xb4b2a6e0) at /home/jdm/electrolysis/ipc/glue/MessagePump.cpp:122
#10 0xb76ff765 in MessageLoop::RunInternal (this=0xb4b2a6e0) at /home/jdm/electrolysis/ipc/chromium/src/base/message_loop.cc:211
#11 0xb76ff789 in MessageLoop::RunHandler (this=0xb4b2a6e0) at /home/jdm/electrolysis/ipc/chromium/src/base/message_loop.cc:194
#12 0xb76ff80d in MessageLoop::Run (this=0xb4b2a6e0) at /home/jdm/electrolysis/ipc/chromium/src/base/message_loop.cc:168
#13 0xb74e23fc in nsBaseAppShell::Run (this=0xb10802e0) at /home/jdm/electrolysis/widget/src/xpwidgets/nsBaseAppShell.cpp:174
#14 0xb724f9dd in nsAppStartup::Run (this=0xb1091400) at /home/jdm/electrolysis/toolkit/components/startup/src/nsAppStartup.cpp:182
#15 0xb639bb16 in XRE_main (argc=3, argv=0xbfda5d44, aAppData=0xb4b06540) at /home/jdm/electrolysis/toolkit/xre/nsAppRunner.cpp:3477
#16 0x08049ac2 in main (argc=3, argv=0xbfda5d44) at /home/jdm/electrolysis/browser/app/nsBrowserApp.cpp:158

Comment 1

[Josh Matthews [:jdm]]

Attachment: Patch queue to reproduce assertion

Comment 2

[Chris Jones [:cjones] inactive; ni?/f?/r? if you need me]

Since this seems to have gone away, I'll mark WORKSFORME.  Please reopen or file anew if it arises again with later patches.