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Old 02-11-2012, 12:57 PM
Émeric Maschino
Default Bug#659485: General stability issues since "futex: Sanitize cmpxchg_futex_value_locked API" commit

Package: linux-image-3.2.0-1-mckinley
Version: 3.2.4-1
Severity: important

As reported first in
http://lists.debian.org/debian-ia64/2012/01/msg00016.html, I'm getting
stability issues with kernel > 2.6.38.

I've bisected the problem to commit
37a9d912b24f96a0591773e6e6c3642991ae5a70 (futex: Sanitize
cmpxchg_futex_value_locked API).

Here are some issues that can be easily observed:
- in a X session (tested under GNOME Classic as well as TWM), hitting
the Tab key while in a terminal window instantly triggers a X restart.
X isn't crashed as I wrongly assume initially. From the logs, it's
definitely properly shut down and restarted
- still in a X session, clicking on the "Edit" menu or "Back button"
of Firefox/Iceweasel triggers a crash of Firefox/Iceweasel. For this
scenario, I have some kind of gdb stack trace in PulseAudio, before
gdb itself goes wrong (more on this later; core file available)

First investigations let me wrongly assume that these issues were
related to something bad in PulseAudio, as uninstalling PulseAudio
fixed both of them (Tab key in a terminal issue and Firefox/Iceweasel

However, other crashes make me believe that PulseAudio was only a
evidence of something more general broken since the bisected commit.
Most notably, gdb can't be started at all. Every attempts to debug a
program immediately ends up with a SIGTRAP signal. Quite problematic
to debug further...

It's noteworthy that the exact same system doesn't exhibit these
issues when rebooted with kernel linux-image-2.6.38-2-mckinley.

-- System Information:
Debian Release: wheezy/sid
APT prefers testing
APT policy: (500, 'testing')
Architecture: ia64

Kernel: Linux 3.2.4-1-mckinley (SMP w/2 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

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