Kernel panic when unpluggin AC adaptor

[Brandon Gooch]

On Thu, May 13, 2010 at 7:25 PM, Giovanni Trematerra
<giovanni.trematerra at gmail.com> wrote:
> On Thu, May 13, 2010 at 1:09 AM, Brandon Gooch
> <jamesbrandongooch at gmail.com> wrote:
>> On Wed, May 12, 2010 at 9:41 AM, Attilio Rao <attilio at freebsd.org> wrote:
>>> 2010/5/12 David DEMELIER <demelier.david at gmail.com>:
>>>> I remove the patch, and built the kernel (I updated the src this
>>>> morning) and it does not panic now. It's really odd. If it reappears
>>>> soon I will tell you.
>>>
>>> I looked at the code with Giovanni and I have the feeling that the
>>> race with the idle thread may still be fatal.
>>> We need to fix that.
>>>
>>> Attilio
>>>
>>
>> That seems to be the case, as my laptop shows about an 80-85 % chance
>> of experiencing a panic if left idle for long-ish periods of time (2
>> to 4 hours). I usually rebuild world or big ports overnight, and more
>> often than not I wake up to a panicked machine, same situation every
>> time:
>>
>> ...
>> rman_get_bushandle() at rman_get_bushandle+0x1
>> sched_idletd() at sched_idletd+0x123
>> fork_exit() at fork_exit+0x12a
>> fork_trampoline() at fork_trampoline+0xe
>> ...
>>
>> The kernel/userland is rebuilt, the ports are finished compiling --
>> it's in the time AFTER the completion of all tasks that the machine
>> gets bored and tries to kill itself :)
>>
>> I have seen the AC adapter plug/unplug "hang" in the past on this
>> laptop, but I never made the connection between the events, as
>> nowadays my laptop usually stays plugged in :(
>>
>> Attilio, I hope you can track this one down, let me know if I can do
>> anything to help or test...
>>
>
> Attilio and I came up with this patch. It seems ready for stress
> testing and review
> Please test and report back.
>
> Thank you
>
> P.S: all the faults are only mine.

I tried the patch, and my kernel panics I panic on boot. I have
8.5MB(!) of JPG images (6 of them) if anyone needs to see them. I'm
looking for a place to post them, but if anyone wants, I can send via
e-mail...

-Brandon