Silent reboots in head @r248550 starting xdm with x11/nvidia-driver

[Jean-Sébastien Pédron]

On 21.03.2013 09:04, Konstantin Belousov wrote:
> On Wed, Mar 20, 2013 at 06:36:10PM -0700, David Wolfskill wrote:
>> I elected to go ahead and try the bisection; here are my results:
>>
>> r248493M/248493: OK
>> r248550M/248551: resets on X startup with nvidia.ko
>> r248521M/248521: resets on X startup with nvidia.ko
>> r248507M/248507: OK
>> r248508M/248508: resets on X startup with nvidia.ko
>>
>> r248493M/248493 was my last working point (built yesterday morning).
>> r248550M/248551 was what failed for me this morning.
>> r248521M/248521 was a convenient mid-point between the above two.
>> r248507M/248507 was the next natural test-point.
>>   r248508M/248508 was a guess on my part -- I would normally have gone to
>>   r248514, but since I had previously noted that r248508 touched some
>>   things that nvidia-driver uses, I thought that test might be worthwhile.
>>
>> I am, however, mildly concerned that no one else appears to be reporting
>> similar symptoms (though I have it on good authority that someone is
>> about to test).
> 
> This gives me an idea. The only so to say 'vm' change in r248508 was an
> addition of the bio_transient_map submap. The vfs.unmapped_buf_allowed
> tunable did not eliminated the submap creation. Please try r248569
> with vfs.unmapped_buf_allowed set to 0.
> 
> If this combination allows the nvidia driver to start, please revert
> the setting of vfs.unmapped_buf_allowed, and instead set
> kern.bio_transient_maxcnt e.g. to 256 or even 128.
> 
> Also, on the machine without the tunables customization, please show
> the output of sysctl kern.nbuf, kern.bio_transient_maxcnt. Also show
> the output of pciconf -lvb.

To be able to have kernel core dumps while X.Org is running, I need to
set the "debug.debugger_on_panic=0" sysctl. Otherwise, the computer only
reboots (it doesn't honor the ddb script).

Maybe it can help here?

-- 
Jean-Sébastien Pédron

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