[alsa-devel] Random process lockup on ARM board: alsa-lib-1.0.25, FUTEX_WAIT_PRIVATE

[Jonathan Andrews]

On Thu, 2012-03-08 at 16:34 +0100, Takashi Iwai wrote:
> At Thu, 08 Mar 2012 15:14:50 +0000,
> Jonathan Andrews wrote:
> > 
> > On Thu, 2012-03-08 at 15:35 +0100, Clemens Ladisch wrote:
> > > Jonathan Andrews wrote:
> > > > Getting closer, alsalib now builds without the need for pthreads but
> > > > seems to insist on dlopen dlclose even in static lib ?
> > > 
> > > Add --without-libdl.
> > > 
Using the static libasound without pthreads now.

Process still stalls in same way:

ARM / # strace -p 408
Process 408 attached - interrupt to quit
futex(0x15a684, FUTEX_WAIT, 2, NULL
^C <unfinished ...>
Process 408 detached

Took 3 hours 1 min to stall. It was decoding 8 udp audio streams, a
second tx process reading from the same sound device was also running.


An strace of a stall (intel this time) is here.  Its 2GB and on a slow
link (sorry).
http://www.jonshouse.co.uk/download/a_stop.txt

futex(0xae5320, FUTEX_WAIT_PRIVATE, 2, NULL) = ? ERESTARTSYS (To be
restarted)
--- SIGINT (Interrupt) @ 0 (0) ---

The futex address 0xae5320 occurs only once at the end of the text file
so I have no idea what sets it up.

Thanks,
Jon