linux-ext4 - Re: Lockup in wait_transaction_locked under memory pressure

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]

Date:	Thu, 25 Jun 2015 15:58:59 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Nikolay Borisov <kernel@...p.com>
Cc:	linux-ext4@...r.kernel.org, Marian Marinov <mm@...com>
Subject: Re: Lockup in wait_transaction_locked under memory pressure

On Thu 25-06-15 16:54:23, Nikolay Borisov wrote:
> 
> 
> On 06/25/2015 04:45 PM, Michal Hocko wrote:
[...]
> > memcg oom killer ignores oom_kill_allocating_task so the victim might be
> > different from the current task. That means the victim might get stuck
> > behind a lock held by somebody else. If the ext4 journaling code depends
> > on memcg charges and retry endlessly then the waiters would get stuck as
> > well.
> 
> I've patched the cgroup OOM so that it takes into account the
> oom_kill_allocating_task.

I am not very much keen on this configuration because it behaves very
randomly and I am pretty sure it will just paper over the real issue
here.

-- 
Michal Hocko
SUSE Labs
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html