Le 05.06.2006 03:10, Andrew Morton a écrit :
> On Sun, 4 Jun 2006 20:59:50 -0400
> Chuck Ebbert <76306.1226@compuserve.com> wrote:
> 
>> In-Reply-To: <44833955.9000104@free.fr>
>>
>> On Sun, 04 Jun 2006 21:49:41 +0200, Laurent Riffard wrote:
>>
>>>> Something strange is happening with the stack.  Can you try with 8K stacks?
>>>>
>>>> kernel hacking --->
>>>>    [ ] Use 4Kb for kernel stacks instead of 8Kb
>>>>
>>> Good catch!
>> Jan Beulich was the one who noticed the stack overflow.
>>
>>> I just tried with 2.6.17-rc5-mm3. The BUG still happens with 4K stacks,
>>> but the system runs fine with 8K stacks.
>> Can you try -mm3 with "check for stack overflows" and 4k stacks?
> 
> Maybe we could modify the check-for-stack-overflows code with 8k stacks to
> be "check for overflows which would kill a 4k stack kernel".  By decreasing
> the thresholds to 3k (say).
> 
>>> Another info: the system is able to run fine with the following scenario,
>>> even with 4K stack:
>>> - boot to runlevel 1
>>> - load pktcdvd (modprobe + pktsetup)
>>> - then go to runlevel 5 
>>> It fails if pktcdvd is loaded at runlevel 2 or higher.
>> I have no idea why that would happen.
> 
> I'd be surprised if it has to do with the packet code - more likely someone
> screwed something up in the lockdep/genirq/unwind area and the kernel went
> recursive.
>
> I tried it here, couldn't reproduce it.  Laurent, can you (re?)send the
> offending .config?
 
.config is attached

I run a few additional tests:

- 2.6.17-rc5-mm3 +  CONFIG_DEBUG_STACKOVERFLOW=y,
CONFIG_DEBUG_STACK_USAGE=y, CONFIG_4KSTACKS=y:

system freezes right after typing "pktsetup test /dev/dvd". 
No stack trace printed.

- Same config as above + lockdep-combo-2.6.17-rc5-mm3.patch +
lockdep-tracer-2.6.17-rc5-mm3.patch:

Random Oops (recursive dies) on early boot. I sometimes succeded on 
booting but the system dies on "pktsetup test /dev/dvd". I can't get a full 
trace since I don't have my second box here for some days. I tried to boot
with vga=791, but system hangs with a blank screen.

-- 
laurent