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To: glibc-bugs@sources.redhat.com
Subject: [Bug nptl/14417] New: EAGAIN handling in pthread_cond_wait make pulseaudio hang
Date: Sun, 29 Jul 2012 14:33:00 -0000
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http://sourceware.org/bugzilla/show_bug.cgi?id=14417

             Bug #: 14417
           Summary: EAGAIN handling in pthread_cond_wait make pulseaudio
                    hang
           Product: glibc
           Version: 2.16
            Status: NEW
          Severity: normal
          Priority: P2
         Component: nptl
        AssignedTo: unassigned@sourceware.org
        ReportedBy: dev@blino.org
                CC: drepper.fsp@gmail.com
    Classification: Unclassified


Since commit c5a0802a682dba23f92d47f0f99775aebfbe2539 (Handle EAGAIN from
FUTEX_WAIT_REQUEUE_PI), pulseaudio apps often hang.

Example backtrace from gnome-shell and libcanberra:

Thread 1 (Thread 0x7f975cfe8900 (LWP 2367)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:144
#1  0x00007f97558a4aa0 in pa_threaded_mainloop_wait (m=0x21bdf00) at
pulse/thread-mainloop.c:206
#2 0x00007f97460aaa0b in pulse_driver_play (c=0x21b5280, id=<optimized
out>, proplist=0x704c9c0, cb=<optimized out>, userdata=<optimized
out>) at pulse.c:1085
#3 0x00007f975955624e in ca_context_play_full (c=c@entry=0x21b5280,
id=id@entry=1, p=0x704c9c0, cb=cb@entry=0x0,
userdata=userdata@entry=0x0) at common.c:522
#4  0x00007f97595565cf in ca_context_play (c=0x21b5280, id=1) at common.c:462
...

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