From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx202.postini.com [74.125.245.202]) by kanga.kvack.org (Postfix) with SMTP id 497BF6B005C for ; Wed, 30 May 2012 07:39:27 -0400 (EDT) Received: by lbjn8 with SMTP id n8so4210891lbj.14 for ; Wed, 30 May 2012 04:39:25 -0700 (PDT) Message-ID: <4FC606E7.4090701@openvz.org> Date: Wed, 30 May 2012 15:39:19 +0400 From: Konstantin Khlebnikov MIME-Version: 1.0 Subject: Re: 3.4-rc7: BUG: Bad rss-counter state mm:ffff88040b56f800 idx:1 val:-59 References: <4FBC1618.5010408@fold.natur.cuni.cz> <20120522162835.c193c8e0.akpm@linux-foundation.org> <20120522162946.2afcdb50.akpm@linux-foundation.org> <20120523172146.GA27598@redhat.com> <4FC52F17.20709@openvz.org> <20120529132658.14ab9ba3.akpm@linux-foundation.org> <4FC546B1.8050508@fold.natur.cuni.cz> In-Reply-To: <4FC546B1.8050508@fold.natur.cuni.cz> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Martin Mokrejs Cc: Andrew Morton , Oleg Nesterov , LKML , "markus@trippelsdorf.de" , "hughd@google.com" , "kamezawa.hiroyu@jp.fujitsu.com" , Michal Hocko , "linux-mm@kvack.org" Martin Mokrejs wrote: > Andrew Morton wrote: >> On Wed, 30 May 2012 00:18:31 +0400 >> Konstantin Khlebnikov wrote: >> >>> Oleg Nesterov wrote: >>>> On 05/22, Andrew Morton wrote: >>>>> >>>>> Also, I have a note here that Oleg was unhappy with the patch. Oleg >>>>> happiness is important. Has he cheered up yet? >>>> >>>> Well, yes, I do not really like this patch ;) Because I think there is >>>> a more simple/straightforward fix, see below. In my opinion it also >>>> makes the original code simpler. >>>> >>>> But. Obviously this is subjective, I can't prove my patch is "better", >>>> and I didn't try to test it. >>>> >>>> So I won't argue with Konstantin who dislikes my patch, although I >>>> would like to know the reason. >>> >>> I don't remember why I dislike your patch. >>> For now I can only say ACK ) >> >> We'll need a changelogged signed-off patch, please Oleg. And some evidence >> that it was tested would be nice ;) > > I will reboot in few hours, finally after few days ... I am running this first > patch. I will try to test the second/alternative patch more quickly. Sorry for > the delay. > easiest way trigger this bug: #define _GNU_SOURCE #include #include #include #include static inline int sys_clone(unsigned long flags, void *stack, int *ptid, int *ctid) { return syscall(SYS_clone, flags, stack, ptid, ctid); } int main(int argc, char **argv) { void *page; page = mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); sys_clone(CLONE_VFORK | CLONE_VM | CLONE_CHILD_CLEARTID, NULL, NULL, page); } -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org