kernel panic on shutdown

Alex Deucher alexdeucher at
Mon Jun 29 12:09:33 PDT 2009

On Mon, Jun 29, 2009 at 3:04 PM, Gilad Arnold<arnold at> wrote:
> Any clue? Can anyone confirm that this is a problem with the radeon
> driver (based on the panic trace)?

Looks like it's related to the vblank code in the drm.  It might be
related to this commit:
However, I'm not that familiar with the drm vblank code.


> Gilad
> On Tue, Jun 16, 2009 at 10:52:51AM -0700, Gilad Arnold wrote:
>> Dear all,
>> I've been experiencing this with recent versions of xf86-driver-ati,
>> currently running 6.12.2 on a Thinkpad T40. I believe it is caused by
>> the video driver, apologies in advance if it isn't. I'm running a Gentoo
>> system with kernel 2.6.28-tuxonice, it has happened with an older
>> version of the kernel as well.
>> This kernel panic happens consistently whenever I'm issuing a system
>> shutdown from gdm. What happens is that the system switches to console
>> mode and starts shutting down various daemons, then invoking a kernel
>> panic.  This is particularly bothering because it happens before the
>> filesystems get a chance to properly flush their journals... bear in
>> mind that this is a mobile system so it gets shutdown fairly often.
>> I can work around this glitch if I manually shift to console mode
>> (Ctrl-Alt-F1), login and invoke shutdown from the command line. Also,
>> switching back and forth between console and X modes seems to work fine.
>> Here are a couple of snapshots showing the tail of the panic trace. Let
>> me know if you need more information (I'm a complete newbie when it
>> comes to deciphering panic messages).
>> Thanks for your help.
>> Gilad
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