linux-kernel - Re: [percpu] 28c9dada65: invoked_oom-killer:gfp

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Date:   Mon, 29 Mar 2021 11:19:07 -0700
From:   Roman Gushchin <guro@...com>
To:     kernel test robot <oliver.sang@...el.com>
CC:     0day robot <lkp@...el.com>, LKML <linux-kernel@...r.kernel.org>,
        <lkp@...ts.01.org>, Dennis Zhou <dennis@...nel.org>,
        Tejun Heo <tj@...nel.org>, Christoph Lameter <cl@...ux.com>,
        Andrew Morton <akpm@...ux-foundation.org>, <linux-mm@...ck.org>
Subject: Re: [percpu]  28c9dada65: invoked_oom-killer:gfp_mask=0x

On Mon, Mar 29, 2021 at 04:37:15PM +0800, kernel test robot wrote:
> 
> 
> Greeting,
> 
> FYI, we noticed the following commit (built with gcc-9):
> 
> commit: 28c9dada655513462112084f5f1769ee49d6fe87 ("[PATCH rfc 3/4] percpu: on demand chunk depopulation")
> url: https://github.com/0day-ci/linux/commits/Roman-Gushchin/percpu-partial-chunk-depopulation/20210325-030746
> base: https://git.kernel.org/cgit/linux/kernel/git/dennis/percpu.git for-next
> 
> in testcase: trinity
> version: trinity-i386-4d2343bd-1_20200320
> with following parameters:
> 
> 	group: group-01
> 
> test-description: Trinity is a linux system call fuzz tester.
> test-url: http://codemonkey.org.uk/projects/trinity/ 
> 
> 
> on test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 16G
> 
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
> 
> 
> +---------------------------------------------------------+------------+------------+
> |                                                         | 0a6ed3d793 | 28c9dada65 |
> +---------------------------------------------------------+------------+------------+
> | boot_successes                                          | 6          | 0          |
> | boot_failures                                           | 0          | 6          |
> | invoked_oom-killer:gfp_mask=0x                          | 0          | 6          |
> | Mem-Info                                                | 0          | 6          |
> | Out_of_memory_and_no_killable_processes                 | 0          | 6          |
> | Kernel_panic-not_syncing:System_is_deadlocked_on_memory | 0          | 6          |
> +---------------------------------------------------------+------------+------------+

Found and fixed the problem. V2 will include the fix.

Thanks!