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SubjectRe: RFC: Self-snapshotting in Linux
On Wed 2008-04-16 14:50:46, Alan Jenkins wrote:
> Pavel Machek wrote:
>>> I guess there is the hardware / drivers issue. I would like to claim
>>> I've found hibernation to be reliable but unfortunately that's not
>>> 100% true.
>>>
>> So debug it, it is open source after all. Or at least file a bugs.
>>
> I definitely want to debug it; I love hibernating. It's a regression and
> it'll affect my distro kernel once I upgrade to Ubuntu Hardy.
>
> <http://bugzilla.kernel.org/show_bug.cgi?id=10196> "Backtraces during
> hibernate / resume".
>
> I posted the backtraces but nobody could tell me what they were - they
> don't actually say whether they're OOPs or BUGs etc. They might be
> softlockups - some times I got softlockup warnings, though thats not in the
> log I posted.

Not sure what that is, I never seen that before.

Can you try vanilla 2.6.25-rc9 or something?

> I'm confused about some details (exactly which versions / configs produced
> which symptoms). I don't have the machine right now, but I'll get back to
> it some time soon. I think I managed to get a pair of broken and
> non-broken kernels to work on, and it seems to be a regression going from
> 2.6.22 to 2.6.23.

If you can do a git bisect between those two, we could probably fix it
very quickly.

> Any help in clearing up my confusion would be appreciated. Is it worth
> trying to narrow down exactly where the hang happens between writing the
> hibernation image and shutting down? If so how? I suspect that's going to
> be easier than bisecting it.

Adding printks?
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html


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