From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f69.google.com (mail-wm0-f69.google.com [74.125.82.69]) by kanga.kvack.org (Postfix) with ESMTP id DD96C6B026B for ; Tue, 12 Jul 2016 03:19:29 -0400 (EDT) Received: by mail-wm0-f69.google.com with SMTP id r190so6722816wmr.0 for ; Tue, 12 Jul 2016 00:19:29 -0700 (PDT) Received: from mail-wm0-f52.google.com (mail-wm0-f52.google.com. [74.125.82.52]) by mx.google.com with ESMTPS id qs5si3544511wjb.98.2016.07.12.00.19.28 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 12 Jul 2016 00:19:28 -0700 (PDT) Received: by mail-wm0-f52.google.com with SMTP id f126so116812491wma.1 for ; Tue, 12 Jul 2016 00:19:28 -0700 (PDT) Date: Tue, 12 Jul 2016 09:19:27 +0200 From: Michal Hocko Subject: Re: bug in memcg oom-killer results in a hung syscall in another process in the same cgroup Message-ID: <20160712071927.GD14586@dhcp22.suse.cz> References: <20160711064150.GB5284@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org List-ID: To: Shayan Pooya Cc: cgroups mailinglist , LKML , linux-mm@kvack.org On Mon 11-07-16 11:33:19, Shayan Pooya wrote: > >> Could you post the stack trace of the hung oom victim? Also could you > >> post the full kernel log? > > With strace, when running 500 concurrent mem-hog tasks on the same > kernel, 33 of them failed with: > > strace: ../sysdeps/nptl/fork.c:136: __libc_fork: Assertion > `THREAD_GETMEM (self, tid) != ppid' failed. > > Which is: https://sourceware.org/bugzilla/show_bug.cgi?id=15392 > And discussed before at: https://lkml.org/lkml/2015/2/6/470 but that > patch was not accepted. OK, so the problem is that the oom killed task doesn't report the futex release properly? If yes then I fail to see how that is memcg specific. Could you try to clarify what you consider a bug again, please? I am not really sure I understand this report. Thanks! -- Michal Hocko SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org