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SubjectRe: X freezes kernel during exit [Re: 2.6.23-rc3-mm1]
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On 09/09/2007 02:47 PM, Andrew Morton wrote:
> On Sun, 09 Sep 2007 13:44:56 +0200 Jiri Slaby <> wrote:
>> On 08/28/2007 01:41 PM, Jiri Slaby wrote:
>>> Does this went through to your boxes? Any progress, clue, idea?
>>> Jiri Slaby napsal(a):
>>>> Andrew Morton napsal(a):
>>>> Hi,
>>>> I've found a regression against 2.6.23-rc2-mm2. X server shutdown freezes
>>>> (untainted) kernel hardly. Nothing on netconsole, X output follows:

sorry, both netconsole and my usb devices (including my keyboard -- no numlock
led switch) are dead. The trace I've taken appears on the screen after a while.

>>>> X Window System Version 1.3.0
>>>> Release Date: 19 April 2007
>>>> X Protocol Version 11, Revision 0, Release 1.3
>>>> Build Operating System: Fedora Core 7 Red Hat, Inc.
>>>> Current Operating System: Linux bellona 2.6.23-rc3-mm1 #315 SMP Wed Aug 22
>>>> (**) RADEON(0): RADEONDRICloseScreen
>>>> the only difference is, that 2.6.23-rc2-mm2 writes further
>>>> FreeFontPath: FPE "/usr/share/X11/fonts/misc:unscaled" refcount is 2, should be
>>>> 1; fixing.
>>>> and exits succesfully (note that these messages are taken on remote host, X
>>>> runned remotely).
>>>> Both vesa and radeon + Option "NoAccel" "true" works obviously fine.
>> Also intel on integrated i915 causes this (NoAccell has no effect in this case).
>> Note that also 2.6.23-rc4-mm1 is affected by this behaviour.
>> I have a trace for you:
>> (this is the only what I'm able to grab so far)
> afacit everything on that call trace is good. I guess it's possible that
> one of the higher-level loops has gone infinite (eg, the one in
> agp_remove_controller()).

There is no loop in this function. Anyway, going to track this whole issue down.
Hold on.

> Are you able to get netconsole working, and run sysrq-P and sysrq-T
> ten or so times, see if it's always stuck in the same place on the
> same CPU?

thanks so far,
Jiri Slaby (
Faculty of Informatics, Masaryk University
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