linux-kernel - Re: [mm, oom_adj] 9954f89181: INFO: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected ]

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Date:	Tue, 31 May 2016 09:55:45 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	kernel test robot <xiaolong.ye@...el.com>
Cc:	lkp@...org, LKML <linux-kernel@...r.kernel.org>,
	0day robot <fengguang.wu@...el.com>
Subject: Re: [mm, oom_adj] 9954f89181: INFO: SOFTIRQ-safe -> SOFTIRQ-unsafe
 lock order detected ]

On Tue 31-05-16 04:03:35, kernel test robot wrote:
> 
> 
> FYI, we noticed the following commit:
> 
> https://github.com/0day-ci/linux Michal-Hocko/Handle-oom-bypass-more-gracefully/20160530-210927
> commit 9954f891814d3f23e10036d2b6404cc80aaa461b ("mm, oom_adj: make sure processes sharing mm have same view of oom_score_adj")

JFTR this patch the underlying code has changed and sighand lock has
been removed. See the current state in
attempts/process-share-mm-oom-sanitization branch at
git://git.kernel.org/pub/scm/linux/kernel/git/mhocko/mm.git

> (md-udevd)/256 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
> (md-udevd)/256 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
>  ( (&(&p->alloc_lock)->rlock&(&p->alloc_lock)->rlock){+.+...}){+.+...}, at: , at: [<ffffffff811d1008>] find_lock_task_mm+0x98/0x1b0
> [<ffffffff811d1008>] find_lock_task_mm+0x98/0x1b0
-- 
Michal Hocko
SUSE Labs