[Bug 65496] [HSW] resume from s4 sporadically causes call trace and system hang, with warm boot

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=65496

--- Comment #36 from Paulo Zanoni <przanoni at gmail.com> ---
Hi

I did some more investigation and I discovered the following:

- It seems that, after resuming, if you run "slabinfo -v" (from tools/vm/),
there's a good chance you'll see dmesg messages saying we detected corruption
on our slabs. It seems to me that it is much much easier to reproduce the bug
with "hibernate, resume, run slabinfo -v, check dmesg, hibernate, resume, etc"
than with just "hibernate, resume". Can you confirm that?

- It also seems that the bug goes away if the kernel that resumes the machine
doesn't load i915.ko. So an experiment you can try is: boot the machine
normally, with i915.ko loaded, tell it to hibernate. Then make the machine
wake-up, and use the "modprobe.blacklist=i915" option when loading the kernel
that will resume the machine. After it resumes, check if the bug is there
(possibly with slabinfo -v). The bug should be gone. Can you please confirm
that?

Thanks,
Paulo

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