linux-kernel - Re: [lkp-developer] [mm, memcg] d18e2b2aca: WARNING:at_mm/memcontrol.c:#mem_cgroup_update_lru

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Date:   Mon, 26 Dec 2016 13:26:51 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     kernel test robot <xiaolong.ye@...el.com>
Cc:     Nils Holland <nholland@...ys.org>, Mel Gorman <mgorman@...e.de>,
        Johannes Weiner <hannes@...xchg.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Chris Mason <clm@...com>, David Sterba <dsterba@...e.cz>,
        linux-btrfs@...r.kernel.org, lkp@...org
Subject: Re: [lkp-developer] [mm, memcg]  d18e2b2aca:
 WARNING:at_mm/memcontrol.c:#mem_cgroup_update_lru_size

On Mon 26-12-16 06:25:56, kernel test robot wrote:
> 
> FYI, we noticed the following commit:
> 
> commit: d18e2b2aca0396849f588241e134787a829c707d ("mm, memcg: fix (Re: OOM: Better, but still there on)")
> url: https://github.com/0day-ci/linux/commits/Michal-Hocko/mm-memcg-fix-Re-OOM-Better-but-still-there-on/20161223-225057
> base: git://git.cmpxchg.org/linux-mmotm.git master
> 
> in testcase: boot
> 
> on test machine: qemu-system-i386 -enable-kvm -m 360M
> 
> caused below changes:
> 
> 
> +--------------------------------------------------------+------------+------------+
> |                                                        | c7d85b880b | d18e2b2aca |
> +--------------------------------------------------------+------------+------------+
> | boot_successes                                         | 8          | 0          |
> | boot_failures                                          | 0          | 2          |
> | WARNING:at_mm/memcontrol.c:#mem_cgroup_update_lru_size | 0          | 2          |
> | kernel_BUG_at_mm/memcontrol.c                          | 0          | 2          |
> | invalid_opcode:#[##]DEBUG_PAGEALLOC                    | 0          | 2          |
> | Kernel_panic-not_syncing:Fatal_exception               | 0          | 2          |
> +--------------------------------------------------------+------------+------------+
> 
> 
> 
> [   95.226364] init: tty6 main process (990) killed by TERM signal
> [   95.314020] init: plymouth-upstart-bridge main process (1039) terminated with status 1
> [   97.588568] ------------[ cut here ]------------
> [   97.594364] WARNING: CPU: 0 PID: 1055 at mm/memcontrol.c:1032 mem_cgroup_update_lru_size+0xdd/0x12b
> [   97.606654] mem_cgroup_update_lru_size(40297f00, 0, -1): lru_size 1 but empty
> [   97.615140] Modules linked in:
> [   97.618834] CPU: 0 PID: 1055 Comm: killall5 Not tainted 4.9.0-mm1-00095-gd18e2b2 #82
> [   97.628008] Call Trace:
> [   97.631025]  dump_stack+0x16/0x18
> [   97.635107]  __warn+0xaf/0xc6
> [   97.638729]  ? mem_cgroup_update_lru_size+0xdd/0x12b

Do you have the full backtrace?
-- 
Michal Hocko
SUSE Labs