netdev - Re: [net] 72fd55c0db: invoked_oom-killer:gfp

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Date:   Fri, 6 May 2022 01:15:40 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     kernel test robot <oliver.sang@...el.com>
Cc:     Eric Dumazet <eric.dumazet@...il.com>, 0day robot <lkp@...el.com>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [net] 72fd55c0db: invoked_oom-killer:gfp_mask=0x

On Thu, May 5, 2022 at 11:44 PM kernel test robot <oliver.sang@...el.com> wrote:
>
>
>
> Greeting,
>
> FYI, we noticed the following commit (built with gcc-11):
>
> commit: 72fd55c0dbb1ad5ba283ca80abc9546702815a33 ("[PATCH v2 net-next] net: generalize skb freeing deferral to per-cpu lists")
> url: https://github.com/intel-lab-lkp/linux/commits/Eric-Dumazet/net-generalize-skb-freeing-deferral-to-per-cpu-lists/20220423-060710
> base: https://git.kernel.org/cgit/linux/kernel/git/davem/net-next.git c78c5a660439d4d341a03b651541fda3ebe76160
> patch link: https://lore.kernel.org/netdev/20220422201237.416238-1-eric.dumazet@gmail.com
>

I think this commit had two follow up fixes.
Make sure to test the tree after the fixes are included, otherwise
this is adding unneeded noise.
Thank you.

commit f3412b3879b4f7c4313b186b03940d4791345534
Author: Eric Dumazet <edumazet@...gle.com>
Date:   Wed Apr 27 13:41:47 2022 -0700

    net: make sure net_rx_action() calls skb_defer_free_flush()

And:

commit 783d108dd71d97e4cac5fe8ce70ca43ed7dc7bb7
Author: Eric Dumazet <edumazet@...gle.com>
Date:   Fri Apr 29 18:15:23 2022 -0700

    tcp: drop skb dst in tcp_rcv_established()


> in testcase: xfstests
> version: xfstests-x86_64-46e1b83-1_20220414
> with following parameters:
>
>         disk: 4HDD
>         fs: ext4
>         fs2: smbv3
>         test: generic-group-10
>         ucode: 0xec
>
> test-description: xfstests is a regression test suite for xfs and other files ystems.
> test-url: git://git.kernel.org/pub/scm/fs/xfs/xfstests-dev.git
>
>
> on test machine: 8 threads Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz with 16G memory
>
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
>
>
>
> If you fix the issue, kindly add following tag
> Reported-by: kernel test robot <oliver.sang@...el.com>
>
>
>
> [   80.428226][ T1836] Attempt to set a LOCK_MAND lock via flock(2). This support has been removed and the request ignored.
> [   80.739189][  T370] generic/207       0s
> [   80.739198][  T370]
> [   80.785302][ T1696] run fstests generic/208 at 2022-05-06 02:42:26
> [   81.143444][ T1836] Attempt to set a LOCK_MAND lock via flock(2). This support has been removed and the request ignored.
> [   89.609627][   T58] kworker/u16:5 invoked oom-killer: gfp_mask=0xcd0(GFP_KERNEL|__GFP_RECLAIMABLE), order=0, oom_score_adj=0
> [   89.620805][   T58] CPU: 0 PID: 58 Comm: kworker/u16:5 Not tainted 5.18.0-rc3-00568-g72fd55c0dbb1 #1
> [   89.629899][   T58] Hardware name: HP HP Z240 SFF Workstation/802E, BIOS N51 Ver. 01.63 10/05/2017
> [   89.638822][   T58] Workqueue: writeback wb_workfn (flush-8:16)
> [   89.644727][   T58] Call Trace:
> [   89.647863][   T58]  <TASK>
> [ 89.650649][ T58] dump_stack_lvl (kbuild/src/consumer/lib/dump_stack.c:107 (discriminator 1))
> [ 89.654992][ T58] dump_header (kbuild/src/consumer/mm/oom_kill.c:73 kbuild/src/consumer/mm/oom_kill.c:461)
> [ 89.659250][ T58] oom_kill_process.cold (kbuild/src/consumer/mm/oom_kill.c:979)
> [ 89.664110][ T58] out_of_memory (kbuild/src/consumer/mm/oom_kill.c:1119 (discriminator 4))
>
>
> To reproduce:
>
>         git clone https://github.com/intel/lkp-tests.git
>         cd lkp-tests
>         sudo bin/lkp install job.yaml           # job file is attached in this email
>         bin/lkp split-job --compatible job.yaml # generate the yaml file for lkp run
>         sudo bin/lkp run generated-yaml-file
>
>         # if come across any failure that blocks the test,
>         # please remove ~/.lkp and /lkp dir to run from a clean state.
>
>
>
> --
> 0-DAY CI Kernel Test Service
> https://01.org/lkp
>
>