This is a Firefox desktop build with --enable-b2g-ril and a stupidly simple phone app. Backtrace: #0 0x00007f487cf0651d in nanosleep () from /lib/x86_64-linux-gnu/libc.so.6 #1 0x00007f487cf063bc in sleep () from /lib/x86_64-linux-gnu/libc.so.6 #2 0x00007f4877c9e3fd in ah_crap_handler (signum=11) at /home/philipp/dev/mc.hg/toolkit/xre/nsSigHandlers.cpp:121 #3 0x00007f4877ca40ac in nsProfileLock::FatalSignalHandler (signo=11, info=0x7fffdacaa670, context=0x7fffdacaa540) at /home/philipp/dev/mc.hg/obj-ff-dbg/toolkit/profile/nsProfileLock.cpp:226 #4 <signal handler called> #5 0x00007f48787fe9ba in mozilla::dom::telephony::Telephony::TelephoneCallback::CallStateChanged (this=0x7f485b8d3fc0, callIndex=1, callState=11, number=...) at /home/philipp/dev/mc.hg/dom/telephony/Telephony.h:146 #6 0x00007f487946161d in NS_InvokeByIndex_P (that=0x7f485b8d3fc0, methodIndex=3, paramCount=3, params=0x7fffdacaac20) at /home/philipp/dev/mc.hg/xpcom/reflect/xptcall/src/md/unix/xptcinvoke_x86_64_unix.cpp:195 #7 0x00007f4878caa7c7 in CallMethodHelper::Invoke (this=0x7fffdacaabe0) at /home/philipp/dev/mc.hg/js/xpconnect/src/XPCWrappedNative.cpp:2899 #8 0x00007f4878ca860d in CallMethodHelper::Call (this=0x7fffdacaabe0) at /home/philipp/dev/mc.hg/js/xpconnect/src/XPCWrappedNative.cpp:2230 #9 0x00007f4878ca84a4 in XPCWrappedNative::CallMethod (ccx=..., mode=XPCWrappedNative::CALL_METHOD) at /home/philipp/dev/mc.hg/js/xpconnect/src/XPCWrappedNative.cpp:2196 #10 0x00007f4878cb594e in XPC_WN_CallMethod (cx=0x7f487c8be5f0, argc=3, ---Type <return> to continue, or q <return> to quit--- vp=0x7f48643fe288) at /home/philipp/dev/mc.hg/js/xpconnect/src/XPCWrappedNativeJSOps.cpp:1540 #11 0x00007f48799929b3 in js::CallJSNative (cx=0x7f487c8be5f0, native=0x7f4878cb56f0 <XPC_WN_CallMethod(JSContext*, unsigned int, JS::Value*)>, args=...) at /home/philipp/dev/mc.hg/js/src/jscntxtinlines.h:311 #12 0x00007f4879977860 in js::InvokeKernel (cx=0x7f487c8be5f0, args=..., construct=js::NO_CONSTRUCT) at /home/philipp/dev/mc.hg/js/src/jsinterp.cpp:520 #13 0x00007f48798ddc39 in js::Invoke (cx=0x7f487c8be5f0, args=..., construct=js::NO_CONSTRUCT) at /home/philipp/dev/mc.hg/js/src/jsinterp.h:157 #14 0x00007f487992ab0a in js_fun_apply (cx=0x7f487c8be5f0, argc=2, vp=0x7f48643fe268) at /home/philipp/dev/mc.hg/js/src/jsfun.cpp:1657 #15 0x00007f48799929b3 in js::CallJSNative (cx=0x7f487c8be5f0, native=0x7f487992a880 <js_fun_apply(JSContext*, unsigned int, JS::Value*)>, args=...) at /home/philipp/dev/mc.hg/js/src/jscntxtinlines.h:311 #16 0x00007f4879977860 in js::InvokeKernel (cx=0x7f487c8be5f0, args=..., construct=js::NO_CONSTRUCT) at /home/philipp/dev/mc.hg/js/src/jsinterp.cpp:520 #17 0x00007f48799851a6 in js::Interpret (cx=0x7f487c8be5f0, entryFrame=0x7f48643fe0d0, interpMode=js::JSINTERP_NORMAL) at /home/philipp/dev/mc.hg/js/src/jsinterp.cpp:3013 #18 0x00007f4879977614 in js::RunScript (cx=0x7f487c8be5f0, ---Type <return> to continue, or q <return> to quit--- script=0x7f486369d350, fp=0x7f48643fe0d0) at /home/philipp/dev/mc.hg/js/src/jsinterp.cpp:475 #19 0x00007f4879977951 in js::InvokeKernel (cx=0x7f487c8be5f0, args=..., construct=js::NO_CONSTRUCT) at /home/philipp/dev/mc.hg/js/src/jsinterp.cpp:538 #20 0x00007f48798ddc39 in js::Invoke (cx=0x7f487c8be5f0, args=..., construct=js::NO_CONSTRUCT) at /home/philipp/dev/mc.hg/js/src/jsinterp.h:157 #21 0x00007f487992ad5e in js::CallOrConstructBoundFunction (cx=0x7f487c8be5f0, argc=1, vp=0x7f48643fe0a0) at /home/philipp/dev/mc.hg/js/src/jsfun.cpp:1781 #22 0x00007f48799929b3 in js::CallJSNative (cx=0x7f487c8be5f0, native=0x7f487992ab68 <js::CallOrConstructBoundFunction(JSContext*, unsigned int, JS::Value*)>, args=...) at /home/philipp/dev/mc.hg/js/src/jscntxtinlines.h:311 #23 0x00007f4879977860 in js::InvokeKernel (cx=0x7f487c8be5f0, args=..., construct=js::NO_CONSTRUCT) at /home/philipp/dev/mc.hg/js/src/jsinterp.cpp:520 #24 0x00007f48798ddc39 in js::Invoke (cx=0x7f487c8be5f0, args=..., construct=js::NO_CONSTRUCT) at /home/philipp/dev/mc.hg/js/src/jsinterp.h:157 #25 0x00007f4879977b3a in js::Invoke (cx=0x7f487c8be5f0, thisv=..., fval=..., argc=1, argv=0x7fffdacac4d0, rval=0x7fffdacac4e0) at /home/philipp/dev/mc.hg/js/src/jsinterp.cpp:570 ---Type <return> to continue, or q <return> to quit--- #26 0x00007f48798ba673 in JS_CallFunctionValue (cx=0x7f487c8be5f0, obj=0x7f4863697cd0, fval=..., argc=1, argv=0x7fffdacac4d0, rval=0x7fffdacac4e0) at /home/philipp/dev/mc.hg/js/src/jsapi.cpp:5455 #27 0x00007f487880f935 in mozilla::dom::workers::events::ListenerManager::DispatchEvent (this=0x7f48634bf000, aCx=0x7f487c8be5f0, aTarget=0x7f4863697cd0, aEvent=0x7f4856d6a060, aPreventDefaultCalled=0x7fffdacac60f) at /home/philipp/dev/mc.hg/dom/workers/ListenerManager.cpp:437 #28 0x00007f48788090c6 in mozilla::dom::workers::events::EventTarget::DispatchEvent (aCx=0x7f487c8be5f0, aArgc=1, aVp=0x7f48643fe088) at /home/philipp/dev/mc.hg/dom/workers/EventTarget.cpp:220 #29 0x00007f48799929b3 in js::CallJSNative (cx=0x7f487c8be5f0, native=0x7f4878809002 <mozilla::dom::workers::events::EventTarget::DispatchEvent(JSContext*, unsigned int, JS::Value*)>, args=...) at /home/philipp/dev/mc.hg/js/src/jscntxtinlines.h:311 #30 0x00007f4879977860 in js::InvokeKernel (cx=0x7f487c8be5f0, args=..., construct=js::NO_CONSTRUCT) at /home/philipp/dev/mc.hg/js/src/jsinterp.cpp:520 #31 0x00007f48798ddc39 in js::Invoke (cx=0x7f487c8be5f0, args=..., construct=js::NO_CONSTRUCT) at /home/philipp/dev/mc.hg/js/src/jsinterp.h:157 #32 0x00007f4879977b3a in js::Invoke (cx=0x7f487c8be5f0, thisv=..., fval=..., argc=1, argv=0x7fffdacac910, rval=0x7fffdacac920) at /home/philipp/dev/mc.hg/js/src/jsinterp.cpp:570 ---Type <return> to continue, or q <return> to quit--- #33 0x00007f48798ba446 in JS_CallFunctionName (cx=0x7f487c8be5f0, obj=0x7f4863697cd0, name=0x7f4879edb68d "dispatchEvent", argc=1, argv=0x7fffdacac910, rval=0x7fffdacac920) at /home/philipp/dev/mc.hg/js/src/jsapi.cpp:5442 #34 0x00007f48788087f4 in mozilla::dom::workers::events::DispatchEventToTarget (aCx=0x7f487c8be5f0, aTarget=0x7f4863697cd0, aEvent=0x7f4856d6a060, aPreventDefaultCalled=0x7fffdacac98e) at /home/philipp/dev/mc.hg/dom/workers/Events.cpp:1185 #35 0x00007f487882004a in (anonymous namespace)::MessageEventRunnable::WorkerRun (this=0x7f48561c3980, aCx=0x7f487c8be5f0, aWorkerPrivate=0x7f48634bf000) at /home/philipp/dev/mc.hg/dom/workers/WorkerPrivate.cpp:898 #36 0x00007f487882230a in mozilla::dom::workers::WorkerRunnable::Run ( this=0x7f48561c3980) at /home/philipp/dev/mc.hg/dom/workers/WorkerPrivate.cpp:1662 #37 0x00007f4879439673 in nsThread::ProcessNextEvent (this=0x7f487c85dd40, mayWait=true, result=0x7fffdacacb6f) at /home/philipp/dev/mc.hg/xpcom/threads/nsThread.cpp:660 #38 0x00007f48793cb9f7 in NS_ProcessNextEvent_P (thread=0x7f487c85dd40, mayWait=true) at /home/philipp/dev/mc.hg/obj-ff-dbg/xpcom/build/nsThreadUtils.cpp:245 #39 0x00007f48792a3bda in mozilla::ipc::MessagePump::Run (this=0x7f486e246780, aDelegate=0x7f487c8d6a80) at /home/philipp/dev/mc.hg/ipc/glue/MessagePump.cpp:134 ---Type <return> to continue, or q <return> to quit--- #40 0x00007f487948b38d in MessageLoop::RunInternal (this=0x7f487c8d6a80) at /home/philipp/dev/mc.hg/ipc/chromium/src/base/message_loop.cc:208 #41 0x00007f487948b31e in MessageLoop::RunHandler (this=0x7f487c8d6a80) at /home/philipp/dev/mc.hg/ipc/chromium/src/base/message_loop.cc:201 #42 0x00007f487948b2f7 in MessageLoop::Run (this=0x7f487c8d6a80) at /home/philipp/dev/mc.hg/ipc/chromium/src/base/message_loop.cc:175 #43 0x00007f487913c684 in nsBaseAppShell::Run (this=0x7f48698d84e0) at /home/philipp/dev/mc.hg/widget/xpwidgets/nsBaseAppShell.cpp:189 #44 0x00007f4878e802d6 in nsAppStartup::Run (this=0x7f48698ef510) at /home/philipp/dev/mc.hg/toolkit/components/startup/nsAppStartup.cpp:220 #45 0x00007f4877c8ff69 in XRE_main (argc=4, argv=0x7fffdacaf818, aAppData=0x623c60) at /home/philipp/dev/mc.hg/toolkit/xre/nsAppRunner.cpp:3537 #46 0x00000000004023f9 in do_main ( exePath=0x7fffdacae710 "/home/philipp/dev/mc.hg/obj-ff-dbg/dist/bin/", argc=4, argv=0x7fffdacaf818) at /home/philipp/dev/mc.hg/browser/app/nsBrowserApp.cpp:205 #47 0x0000000000402660 in main (argc=4, argv=0x7fffdacaf818) at /home/philipp/dev/mc.hg/browser/app/nsBrowserApp.cpp:295

Looks like we tried to be smarter than we actually are ;). Fixed! Code is much dumber now.