Re: 2.6.32-rc1: various BUGs on resume from hibernation

Alan Jenkins
2009-10-06T08:58:48Z

Rafael J. Wysocki wrote:
> On Monday 05 October 2009, Alan Jenkins wrote:
>
>> Alan Jenkins wrote:
>>
>>> Stefan Seyfried wrote:
>>>
>>>> On Sun, 4 Oct 2009 22:47:43 +0200
>>>> "Rafael J. Wysocki" <rjw@sisk.pl> wrote:
>>>>
>>>>> On Sunday 04 October 2009, Alan Jenkins wrote:
>>>>>
>>>>>> Alan Jenkins wrote:
>>>>>>
>>>>>>> I'm seeing a variety of BUGs on my EeePC 701 after hibernation.
>>>>>>> Sometimes they cause a hang during resume; sometimes they happen
>>>>>>> just after resume. It doesn't happen all the time either - I've
>>>>>>> just hibernated three times in a row with no problems. It's most
>>>>>>> perplexing.
>>>>>>>
>>>>> As I already asked in the Bugzilla, can you verify that this is
>>>>> reproducible without KMS?
>>>>>
>>> No. I couldn't reproduce it without KMS. Then I re-enabled KMS,
>>> hibernated a couple of times, and had another resume hang (different
>>> again - this time in the freezer).
>>>
>>>
>> Perhaps this GEM backtrace is more relevant than the others, or perhaps
>> not. I closed the lid during resume from hibernation; the screen stayed
>> black when I re-opened it, but syslogd recorded the following. (Again,
>> I've done the exact thing before and often nothing unusual happens) -
>>
>
> OK, let's assume it's related to KMS, then.
>
> 1. Do we already have a Bugzilla entry for it?
> 2. Did it work with 2.6.31 (and with KMS)?
>

I thought so, but my recollection is hazy. I didn't test it for very
long if I did. I've tried it now and 2.6.31 behaves pretty similarly.
Sorry for ringing the regression bell.

Firstly the _hibernation_ process hung (after a couple of suspend-to-ram
cycles).

No text on the console (despite using s2disk). It echoed keypresses and
responds to SysRq keys. No messages from lockdep or the hung task
detector (after waiting 5 minutes). SysRq-P said we're in the idle
loop; SysRq-T said both events/0 and hald-addon-input were runnable.

Then suspend-to-ram hung (following a hibernation cycle). This time it
showed the contents of vt1, but didn't appear to respond to anything
short of SysRq+B.

> 3. Are you aware of http://marc.info/?l=linux-kernel&m=125452324520623&w=4 ?
>
> Thanks,
> Rafael
>

I guess there's no connection. That issue seems to be about generally
flickery screens. I've seen a few rare flickers that might be related.
But in general nothing bad happens until I try to suspend, and the
badness is in the form of random crashes or hangs.

Also that bug is confirmed to be a regression, and my issue isn't :-).

Many thanks
Alan