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SubjectRe: RFC: Self-snapshotting in Linux
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.

The backtraces have been harder to reproduce across different versions /
configs, but there's definitely an issue where it hangs every time after
it successfully suspends. It then tends to lock up about a minute after
resuming.

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.

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.

Alan


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