Re: [mm? 4.15-rc7] Random oopses under memory pressure.

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On Thu 11-01-18 23:11:12, Tetsuo Handa wrote:
> Michal Hocko wrote:
> > On Wed 10-01-18 22:37:52, Tetsuo Handa wrote:
> > > Michal Hocko wrote:
> > > > On Wed 10-01-18 20:49:56, Tetsuo Handa wrote:
> > > > > Tetsuo Handa wrote:
> > > > > > I can hit this bug with Linux 4.11 and 4.8. (i.e. at least all 4.8+ have this bug.)
> > > > > > So far I haven't hit this bug with Linux 4.8-rc3 and 4.7.
> > > > > > Does anyone know what is happening?
> > > > > 
> > > > > I simplified the reproducer and succeeded to reproduce this bug with both
> > > > > i7-2630QM (8 core) and i5-4440S (4 core). Thus, I think that this bug is
> > > > > not architecture specific.
> > > > 
> > > > Can you see the same with 64b kernel?
> > > 
> > > No. I can hit this bug with only x86_32 kernels.
> > > But if the cause is not specific to 32b, this might be silent memory corruption.
> > > 
> > > > It smells like a ref count imbalance and premature page free to me. Can
> > > > you try to bisect this?
> > > 
> > > Too difficult to bisect, but at least I can hit this bug with 4.8+ kernels.
> 
> The bug in 4.8 kernel might be different from the bug in 4.15-rc7 kernel.
> 4.15-rc7 kernel hits the bug so trivially.

Maybe you want to disable the oom reaper to reduce chances of some issue
there.
-- 
Michal Hocko
SUSE Labs



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