linux-kernel - Re: next-20200515: Xorg killed due to "OOM"

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Message-ID: <20200528120750.GC27484@dhcp22.suse.cz>
Date:   Thu, 28 May 2020 14:07:50 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Pavel Machek <pavel@....cz>
Cc:     kernel list <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...l.org>, airlied@...ux.ie,
        daniel@...ll.ch, dri-devel@...ts.freedesktop.org,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, x86@...nel.org,
        hpa@...or.com
Subject: Re: next-20200515: Xorg killed due to "OOM"

On Thu 28-05-20 14:03:54, Pavel Machek wrote:
> On Thu 2020-05-28 11:05:17, Michal Hocko wrote:
> > On Tue 26-05-20 11:10:54, Pavel Machek wrote:
> > [...]
> > > [38617.276517] oom_reaper: reaped process 31769 (chromium), now anon-rss:0kB, file-rss:0kB, shmem-rss:7968kB
> > > [38617.277232] Xorg invoked oom-killer: gfp_mask=0x0(), order=0, oom_score_adj=0
> > > [38617.277247] CPU: 0 PID: 2978 Comm: Xorg Not tainted 5.7.0-rc5-next-20200515+ #117
> > > [38617.277256] Hardware name: LENOVO 17097HU/17097HU, BIOS 7BETD8WW (2.19 ) 03/31/2011
> > > [38617.277266] Call Trace:
> > > [38617.277286]  dump_stack+0x54/0x6e
> > > [38617.277300]  dump_header+0x45/0x321
> > > [38617.277313]  oom_kill_process.cold+0x9/0xe
> > > [38617.277324]  ? out_of_memory+0x167/0x420
> > > [38617.277336]  out_of_memory+0x1f2/0x420
> > > [38617.277348]  pagefault_out_of_memory+0x34/0x56
> > > [38617.277361]  mm_fault_error+0x4a/0x130
> > > [38617.277372]  do_page_fault+0x3ce/0x416
> > 
> > The reason the OOM killer has been invoked is that the page fault
> > handler has returned VM_FAULT_OOM. So this is not a result of the page
> > allocator struggling to allocate a memory. It would be interesting to
> > check which code path has returned this. 
> 
> Should the core WARN_ON if that happens and there's enough memory, or
> something like that?

I wish it would simply go away. There shouldn't be really any reason for
VM_FAULT_OOM to exist. The real low on memory situation is already
handled in the page allocator.

-- 
Michal Hocko
SUSE Labs