crash in cpuidle_enter_state with 5.7-rc1

Michael Ellerman mpe at ellerman.id.au
Tue Apr 21 22:21:52 AEST 2020


Michal Suchánek <msuchanek at suse.de> writes:
> On Mon, Apr 20, 2020 at 08:50:30AM +0200, Michal Suchánek wrote:
>> On Mon, Apr 20, 2020 at 04:15:39PM +1000, Michael Ellerman wrote:
>> > Michal Suchánek <msuchanek at suse.de> writes:
> ...
>> > 
>> > 
>> > And I've just hit it with your config on a machine here, but the crash
>> > is different:
>> That does not look like it.
>> You don't have this part in the stack trace:
>> > [    1.234899] [c000000007597420] [0000000000000000] 0x0
>> > [    1.234908] [c000000007597720] [0000000000000a6d] 0xa6d
>> > [    1.234919] [c000000007597a20] [0000000000000000] 0x0
>> > [    1.234931] [c000000007597d20] [0000000000000004] 0x4
>> which is somewhat random but at least on such line is always present in
>> the traces I get. Also I always get crash in cpuidle_enter_state
> ..
>> > I'm going to guess it's STRICT_KERNEL_RWX that's at fault.
>> I can try without that as well.
>
> Can't reproduce without STRICT_KERNEL_RWX either.

I've reproduced something similar all the way back to v5.5, though it
seems harder to hit - sometimes 5 boots will succeed before one fails.

Are you testing on top of PowerVM or KVM?

cheers


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