Re: 2.6.21-rc5 possible regression: KDE processes die silently (was: 2.6.21-rc3-mm2: KDE processes die while system is idle)

[Adrian Bunk <bunk@stusta.de>]

On Sun, Apr 01, 2007 at 06:48:03PM +0200, Rafael J. Wysocki wrote:
> On Sunday, 1 April 2007 17:21, Tilman Schmidt wrote:
> > I'm sorry to say this has now happened with kernel 2.6.21-rc5, too.
> > I started a kernel compilation in the evening and came back in the
> > morning to find all KDE decorations gone. All processes normally
> > running for a KDE session and labelled "[kinit]" in ps were gone
> > but everything else was running fine, and the system was still
> > usable via ssh. /var/log/kdm.log and /var/log/Xorg.0.log contained
> > nothing remotely suspicious. /var/log/messages had two lines I
> > never saw before:
> > 
> > Mar 31 02:27:36 gx110 kernel: [153577.891443] ReiserFS: hda3: warning: vs-8115: get_num_ver: not directory or indirect item
> > Mar 31 02:27:36 gx110 kernel: [153577.891559] ReiserFS: hda3: warning: vs-8115: get_num_ver: not directory or indirect item
> > 
> > But those didn't appear on previous occurrences of the "dying KDE"
> > problem so I guess they are not related.
> > 
> > This is SUSE LINUX 10.0 (i586) running on a Dell OptiPlex GX110
> > (Intel P3, 933 MHz, i810 chipset, 512 MB RAM, 60 GB ATA disk)
> > % uname -a
> > Linux gx110 2.6.21-rc5-noinitrd #1 PREEMPT Sat Mar 31 02:15:19 CEST 2007 i686 i686 i386 GNU/Linux
> > % cat /proc/cmdline
> > root=/dev/hda3 selinux=0 x11i=vesa video=intelfb:mode=1280x1024-32@70 nmi_watchdog=2 lapic 5
> > Kernel configuration mostly-modular, based on standard SuSE kernel's
> > /proc/config.gz, just compiling into the kernel everything I need to
> > boot without an initrd and omitting some parts I'm not interested in.
> > (.config attached.) What else might be relevant?
> > 
> > Again, this is a Heisenbug, ie. it's not reproducible and invariably
> > happens when I'm away from the machine. (Probably Murphy at work.)
> > It's pretty rare: I have seen it four times on 2.6.21-rc3-mm2 and
> > once on 2.6.21-rc5, on a machine which spends about equal amounts
> > of time running the latest stable, rc, and mm kernels. OTOH, so far
> > it hasn't ever happened with any 2.6.20 or earlier kernel. Nor have
> > I seen it with 2.6.21-rc[1-4] or 2.6.21-rc4-mm* - but for the -rc4
> > and -rc4-mm releases that's not conclusive as those have only been
> > running for a very short time.
> 
> I have a similar problem on x86_64 OpenSUSE 10.2, but it seems to happen
> when a sound (eg. notification) is played while the display is suspended
> (or "powered off").

Is it easily reproducible and still present with the latest -git?
If yes, can you bisect?

> IMO it's a SUSE bug.

We also have a report of KDE crashes on Debian [1].
And just a few days ago a kernel bug kwin ran into was fixed [2].

If the pattern is "works with 2.6.20 but does not work with 2.6.21-rc",
then it's most likely a kernel regression. 

> Greetings,
> Rafael

cu
Adrian

[1] http://bugzilla.kernel.org/show_bug.cgi?id=8157
[2] commit 14e9d5730adfca26452b3a2838a80af6950556f5

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