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SubjectRe: [linux-pm] intermittent suspend problem again
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On Tuesday 01 December 2009, Ferenc Wagner wrote:
> "Rafael J. Wysocki" <rjw@sisk.pl> writes:
>
> > On Tuesday 01 December 2009, Ferenc Wagner wrote:
> >> "Rafael J. Wysocki" <rjw@sisk.pl> writes:
> >>
> >>> On Sunday 29 November 2009, Ferenc Wagner wrote:
> >>>
> >>>> "Rafael J. Wysocki" <rjw@sisk.pl> writes:
> >>>>
> >>>>> On Saturday 28 November 2009, Ferenc Wagner wrote:
> >>>>>
> >>>>>> "Rafael J. Wysocki" <rjw@sisk.pl> writes:
> >>>>>>
> >>>>>>> Compile with CONFIG_PM_VERBOSE (it does mean exactly that).
> >>>>>>
> >>>>>> The last message now was:
> >>>>>>
> >>>>>> e100: 0000:02:08.0: hibernate, may wakeup
> >>>>>>
> >>>>>> Looks like hibernating the e100 driver is unstable.
> >>>>>
> >>>>> Can you verify that by trying to hibernate without the e100 driver?
> >>>>
> >>>> Not really, as I still can't reliable reproduce the issue. Since I'm
> >>>> running with suspend loglevel = 8, it's happened only twice (in a row),
> >>>> with seemingly exact same console output. Some earlier freezes also
> >>>> happened in dpm_suspend_start, at least. However, I can certainly add
> >>>> e100 to SUSPEND_MODULES under /etc/pm/config.d, and continue running
> >>>> with that.
> >>>
> >>> That's what I'd do.
> >>
> >> That worked out mosty OK (no freeze in quite some hibernation cycles),
> >> but I'm continuing testing it.
> >
> > Great, please let me know how it works out.
>
> Will do. On the negative side, this tends to confuse NetworkManager.
>
> >> On the other hand, I reverted 8fbd962e3, recompiled and replaced the
> >> module, and got the freeze during hibernation. And that was the bulk of
> >> the changes since 2.6.31... I'll revert the rest and test again, but
> >> that seems purely cosmetic, so no high hopes.
> >>
> >>> In addition to that, you can run multiple hibernation/resume cycles in
> >>> a tight loop using the RTC wakealarm.
> >>
> >> I'll do so, as soon as I find a way to automatically supply the dm-crypt
> >> passphrase... or even better, learn to hibernate to ramdisk from the
> >> initramfs. :)
> >
> > Well, you don't need to use swap encryption for _testing_. :-)
>
> I use partition encryption, everything except for /boot is encrypted.

If /boot is big enough, you could use a swap file in /boot for the testing.

> Apropos: does s2disk perform encryption with a temporary key even if I
> don't supply and RSA key, to protect mlocked application data from being
> present in the swap after restore?

It can do that, but you need to provide a key during suspend and resume.

Otherwise it doesn't use a random key, because it would have to store it in
the clear in the image header.

Thanks,
Rafael


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