'Twas brillig, and Lennart Poettering at 28/08/09 15:39 did gyre and gimble:
3) I'm also seeing quite regularly a deadlock in pulse. This one is
quite serious as it obviously freezes the display of most libcanberra
apps :s See attached pulse-deadlock.txt
#0 0x00007f706ab57ea7 in mlock () from /lib64/libc.so.6
#1 0x00007f706e2ef0d2 in pa_will_need (p=0xc300c300c300c3, l=<value optimized
out>) at pulsecore/core-util.c:2140
#2 0x00007f706e2fdbea in pa_memchunk_will_need (c=0x23cf0f8) at
pulsecore/memchunk.c:88
#3 0x00007f706e2fccb9 in pa_memblockq_willneed (bq=<value optimized out>) at
pulsecore/memblockq.c:914
[...]
4 Thread 0x7f706a86b910 (LWP 9012) 0x00007f706ab51a47 in ppoll () from
/lib64/libc.so.6
3 Thread 0x7f70648f4910 (LWP 9016) 0x00007f706ab51a47 in ppoll () from
/lib64/libc.so.6
2 Thread 0x7f70640f3910 (LWP 9149) 0x00007f706ab51a47 in ppoll () from
/lib64/libc.so.6
* 1 Thread 0x7f706ebba6f0 (LWP 8899) 0x00007f706ab57ea7 in mlock () from
/lib64/libc.so.6
The IO threads are hanging in ppoll(), and are hence not
deadlocked. The main thread hangs in mlock(). Which is a fucntion that
locks memory into RAM. We use it as a dirty hack for making sure
cached samples are swapped back into RAM before we ask the IO threads
to play them. Normally, mlock() should just swap things in and lock
them. We then immediately call munlock(). If this freezes for you then
there is something really wrong with your kernel. I have not seen this
issue before.
This seems be be behaving better with a new kernel... not had the
problem again so far. I think the rc8 had some messed up inotify stuff
which may explain it.
Col
--
Colin Guthrie
gmane(at)colin.guthr.ie
http://colin.guthr.ie/
Day Job:
Tribalogic Limited [http://www.tribalogic.net/]
Open Source:
Mandriva Linux Contributor [http://www.mandriva.com/]
PulseAudio Hacker [http://www.pulseaudio.org/]
Trac Hacker [http://trac.edgewall.org/]
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