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Date: Sun, 16 Jun 2013 20:06:21 +0200
From: Michiel Boland <boland37@xs4all.nl>
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To: Konstantin Belousov <kostikbel@gmail.com>
Subject: Re: system sporadically hangs on shutdown after switching to
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References: <51BDD593.5000102@xs4all.nl> <20130616153710.GT91021@kib.kiev.ua>
 <51BDF201.40703@xs4all.nl> <20130616174645.GY91021@kib.kiev.ua>
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On 06/16/2013 19:46, Konstantin Belousov wrote:
> On Sun, Jun 16, 2013 at 07:12:33PM +0200, Michiel Boland wrote:
>> On 06/16/2013 17:37, Konstantin Belousov wrote:
>> [...]
>>> I do not see anything related to i915 in the core.txt you provided.
>>>
>>> Next time the machine hangs, start with the output of ps command from
>>> ddb and 'show allpcpu', together with 'alltrace'.
>>>
>>
>> Ok, I captured 'ps', 'show allpcpu' and 'alltrace' from a stuck shutdown. I've
>> appended it to my core.txt. (See previous e-mail.) (Note that the ddb commands
>> are from a different session - so the ddb output may not match with the kgdb
>> output.)
>>
>
> Hm, how do you initiate the shutdown ? Show the exact command.
> Also, from the same moment of the hung system, enter the ddb and
> again do ps, alltrace and 'x rebooting'.
>

The exact command to generate the hangs from which I created the reports was

'shutdown -r now'

FWIW - the saved core from the ddb-induced panic has

(kgdb) print rebooting
$1 = 1