[bisected] Unstable desktop experience with kernel > 2.6.38. PulseAudio involved

[Émeric Maschino]

Hi,

Just to let you know that, as could have been guessed from my initial
post (http://lists.debian.org/debian-ia64/2012/01/msg00016.html),
PulseAudio is involved. Uninstalling pulseaudio,
pulseaudio-esound-compat, pulseaudio-module-x11, pulseaudio-utils and
gstreamer0.10-pulseaudio packages "fixes" the issue. Obviously, you
get no more sound :-(.

Is there something in PulseAudio source code that hasn't been updated
(maybe only on IA-64?) following commit
37a9d912b24f96a0591773e6e6c3642991ae5a70 (futex: Sanitize
cmpxchg_futex_value_locked API)?

The bad news: I can't provide more information at this time as all the
programs that I've tried to ran through gdb (most notably iceweasel
and gnome-terminal as they were my easy to reproduce scenarii) are
receiving SIGTRAP signal, and bt full reports No symbol table info
available. I however have debug packages installed.

     Émeric


Le 28 janvier 2012 20:21, Patrick Baggett <baggett.patrick at gmail.com> a écrit :
> From looking at:
>
> http://neil.brown.name/git?p=linux-2.6;a=blobdiff;f=arch/ia64/include/asm/futex.h;h=b0728404dad05c9349aea95d4e28b91b1b363a21;hp=c7f0f062239cd541112ecbe10cdd34dc54672eec;hb=37a9d912b24f96a0591773e6e6c3642991ae5a70;hpb=522d7decc0370070448a8c28982c8dfd8970489e
>
> It doesn't look like the return value (r8) is actually being set beyond
> initialized to 0. If there is some ia64 instruction that modifies it, GCC
> doesn't know about it from the inline assembly (r8 doesn't appear in the
> inputs/outputs list). From looking at the x86 version (agh, inline asm is
> hard to parse), it does modify the return value based on whether the
> comparison was a success or not, and the return value is certainly used by
> the callers.
>
> Patrick
>
> On Sat, Jan 28, 2012 at 6:43 AM, Émeric Maschino <emeric.maschino at gmail.com>
> wrote:
>>
>> Hi,
>>
>> Just to let you know that I've bisected this issue to commit
>> 37a9d912b24f96a0591773e6e6c3642991ae5a70
>> (futex: Sanitize cmpxchg_futex_value_locked API).
>>
>>     Émeric
>>
>>
>>
>> Le 17 janvier 2012 23:11, Émeric Maschino <emeric.maschino at gmail.com> a
>> écrit :
>> > Hi,
>> >
>> > Since there's a workaround allowing us to go kernel > 2.6.38
>> > (http://lists.debian.org/debian-ia64/2012/01/msg00013.html), I
>> > obviously updated my Testing system to current
>> > linux-image-3.1.0-1-mckinley_3.1.8-2_ia64.deb.
>> >
>> > Well, graphical desktop experience is _unstable_. When I say "desktop
>> > experience", I'm talking about basic desktop tasks, not fancy OpenGL
>> > rendering. I have at least two reproducible scenari (I'm running Gnome
>> > Classic):
>> > - random X restart while typing into a GNOME terminal window
>> > - Iceweasel killed when I try to click on the Back button or while
>> > trying to click on the Edit menu.
>> >
>> > For the latter one, I managed to get a stack trace with gdb, before
>> > gdb itself core dumped (huge core available if interested!) or X is
>> > restarted... It seems that something goes wrong with PulseAudio when
>> > running kernel 3.1:
>> >
>> > Program received signal SIGABRT, Aborted.
>> > [Switching to Thread 0x7002b5231e0 (LWP 2282)]
>> > 0xa000000000040721 in __kernel_syscall_via_break ()
>> >
>> > Thread 19 (Thread 0x7002b5231e0 (LWP 2282)):
>> > #0  0xa000000000040721 in __kernel_syscall_via_break ()
>> > No symbol table info available.
>> > #1  0x200000000031a900 in raise () from /lib/ia64-linux-gnu/libc.so.6.1
>> > No symbol table info available.
>> > #2  0x2000000000322eb0 in abort () from /lib/ia64-linux-gnu/libc.so.6.1
>> > No symbol table info available.
>> > #3  0x000007001612a310 in pa_mutex_unlock ()
>> >   from /usr/lib/ia64-linux-gnu/libpulsecommon-1.0.so
>> > No symbol table info available.
>> > #4  0x000007001604f8b0 in poll_func ()
>> >   from /usr/lib/ia64-linux-gnu/libpulse.so.0
>> > No symbol table info available.
>> >
>> > Rebooting my Testing system with good old kernel 2.6.38-5 brings a
>> > stable desktop experience back.
>> >
>> > I've performed regression testing: the issue is already there with
>> > linux-image-2.6.39-rc4-mckinley_2.6.39~rc4-1~experimental.1_ia64.deb,
>> > the immediate successor to
>> > linux-image-2.6.38-2-mckinley_2.6.38-5_ia64.deb in
>> > snapshot.debian.org. Latest available
>> > linux-image-3.2.0-rc7-mckinley_3.2~rc7-1~experimental.1_ia64.deb still
>> > provides unstable desktop experience.
>> >
>> > Does this sound familiar to someone? Is this problem already known and
>> > reported somewhere or is it worth filing a bug and going the git
>> > bisect route?
>> >
>> >     Émeric
>>
>>
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>>
>