Re: [bisected] Unstable desktop experience with kernel > 2.6.38

[Émeric Maschino <emeric.maschino@gmail.com>]

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@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