Hi,
I collected some stack traces and apparently the problem happens in
libcanberra-pulse :
Thread 1 (Thread 0x7f5fdf4bb780 (LWP 2004) "firefox-bin"):
#0 __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0,
op=393, expected=0, futex_word=0x7f5f992d5f3c) at ./nptl/futex-internal.c:57
#1 __futex_abstimed_wait_common
(futex_word=futex_word@entry=0x7f5f992d5f3c, expected=expected@entry=0,
clockid=clockid@entry=0, abstime=abstime@entry=0x0,
private=private@entry=0, cancel=cancel@entry=true) at
./nptl/futex-internal.c:87
#2 0x00007f5fdee844bb in __GI___futex_abstimed_wait_cancelable64
(futex_word=futex_word@entry=0x7f5f992d5f3c, expected=expected@entry=0,
clockid=clockid@entry=0, abstime=abstime@entry=0x0,
private=private@entry=0) at ./nptl/futex-internal.c:139
#3 0x00007f5fdee86c00 in __pthread_cond_wait_common (abstime=0x0,
clockid=0, mutex=0x7f5f97b907c0, cond=0x7f5f992d5f10) at
./nptl/pthread_cond_wait.c:503
#4 ___pthread_cond_wait (cond=0x7f5f992d5f10, mutex=0x7f5f97b907c0) at
./nptl/pthread_cond_wait.c:618
#5 0x00007f5facf68577 in pa_cond_wait (c=<optimized out>, m=<optimized
out>) at ../src/pulsecore/mutex-posix.c:146
#6 0x00007f5fad53da48 in pa_threaded_mainloop_wait (m=0x7f5f98c52f40)
at ../src/pulse/thread-mainloop.c:216
#7 0x00007f5fae589d90 in pulse_driver_open (c=0x7f5fa5487440) at
./src/pulse.c:436
#8 0x00007f5f94f4e379 in driver_open (c=c@entry=0x7f5fa5487440) at
./src/dso.c:273
#9 0x00007f5f94f45868 in context_open_unlocked
(c=c@entry=0x7f5fa5487440) at ./src/common.c:293
#10 0x00007f5f94f4650e in ca_context_play_full
(c=c@entry=0x7f5fa5487440, id=id@entry=0, p=0x7f5f991c7de0,
cb=cb@entry=0x0, userdata=userdata@entry=0x0) at ./src/common.c:517
#11 0x00007f5f94f46915 in ca_context_play (c=0x7f5fa5487440, id=0) at
./src/common.c:462
#12 0x00007f5fd520603c in nsSound::PlayEventSound(unsigned int) () from
/home/gabriel/software/firefox/libxul.so
#13 0x00007f5fd53f19cc in nsMenuPopupFrame::ShowPopup(bool) () from
/home/gabriel/software/firefox/libxul.so
#14 0x00007f5fd53fd8fb in
nsXULPopupManager::ShowPopupCallback(nsIContent*, nsMenuPopupFrame*,
bool, bool) () from /home/gabriel/software/firefox/libxul.so
#15 0x00007f5fd53fc7a1 in
nsXULPopupManager::BeginShowingPopup(PendingPopup const&, bool, bool) ()
from /home/gabriel/software/firefox/libxul.so
#16 0x00007f5fd53fc485 in nsXULPopupManager::ShowMenu(nsIContent*, bool)
() from /home/gabriel/software/firefox/libxul.so
#17 0x00007f5fd53f9d60 in
mozilla::detail::RunnableFunction<nsMenuFrame::OpenMenu(bool)::$_0>::Run()
() from /home/gabriel/software/firefox/libxul.so
#18 0x00007f5fd7243f80 in
mozilla::TaskController::DoExecuteNextTaskOnlyMainThreadInternal(mozilla::detail::BaseAutoLock<mozilla::Mutex&>
const&) () from /home/gabriel/software/firefox/libxul.so
#19 0x00007f5fd724b2ea in nsThread::ProcessNextEvent(bool, bool*) ()
from /home/gabriel/software/firefox/libxul.so
#20 0x00007f5fd72928f5 in
mozilla::ipc::MessagePump::Run(base::MessagePump::Delegate*) () from
/home/gabriel/software/firefox/libxul.so
#21 0x00007f5fd7dd032f in MessageLoop::Run() () from
/home/gabriel/software/firefox/libxul.so
#22 0x00007f5fd84f4249 in nsBaseAppShell::Run() () from
/home/gabriel/software/firefox/libxul.so
#23 0x00007f5fd5fc75c5 in nsAppStartup::Run() () from
/home/gabriel/software/firefox/libxul.so
#24 0x00007f5fd603cf60 in XREMain::XRE_mainRun() () from
/home/gabriel/software/firefox/libxul.so
#25 0x00007f5fd603d893 in XREMain::XRE_main(int, char**,
mozilla::BootstrapConfig const&) () from
/home/gabriel/software/firefox/libxul.so
#26 0x00007f5fd603dc76 in XRE_main(int, char**, mozilla::BootstrapConfig
const&) () from /home/gabriel/software/firefox/libxul.so
#27 0x000055b10856e652 in ma in ()
[Inferior 1 (process 2004) detached]
Apparently clicking on a menu triggers a canberra notification which
goes trough pulseaudio. Looking at canberra source code, it creates a
pulse audio threaded mainloop which appears to never reach the
PA_CONTEXT_READY state.
Gabriel
