linux-kernel - Re: PROBLEM: Crash cgdeleting empty memory cgroups with memory.kmem.limit_in

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <51260390.8010203@parallels.com>
Date:	Thu, 21 Feb 2013 15:22:56 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	Tejun Heo <tj@...nel.org>
CC:	Steffen Michalke <StMichalke@....de>,
	<linux-kernel@...r.kernel.org>, "Li Zefan" <lizefan@...wei.com>,
	<containers@...ts.linux-foundation.org>,
	"Johannes Weiner" <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	Balbir Singh <bsingharora@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: PROBLEM: Crash cgdeleting empty memory cgroups with memory.kmem.limit_in_bytes
 set

On 02/21/2013 03:00 AM, Tejun Heo wrote:
> (cc'ing cgroup / memcg people and quoting whole body)
> 
> Looks like something is going wrong with memcg cache destruction.
> Glauber, any ideas?  Also, can we please not use names as generic as
> kmem_cache_destroy_work_func for something specific to memcg?  How
> about something like memcg_destroy_cache_workfn?
> 
> Thanks.

Steffen,

Is there any chance you could test that using SLAB instead of SLUB?
I haven't manage to reproduce it yet, but I am working on some theories
about why this is happening. If I could at least know if this is likely
a cache problem vs a inner-memcg problem, that would help. The calltrace
is not incredibly helpful, but it does indicate that the problem happens
when freeing cache objects.



--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/