From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751758AbaKWQdE (ORCPT ); Sun, 23 Nov 2014 11:33:04 -0500 Received: from mail.skyhub.de ([78.46.96.112]:60554 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751415AbaKWQdC (ORCPT ); Sun, 23 Nov 2014 11:33:02 -0500 Date: Sun, 23 Nov 2014 17:32:58 +0100 From: Borislav Petkov To: Chris Mason Cc: torvalds@linux-foundation.org, linux-kernel@vger.kernel.org Subject: Re: New crashes walking proc with Saturday's git Message-ID: <20141123163258.GB6436@pd.tnic> References: <20141123010239.GA12691@ret.masoncoding.com> <1416758187.24312.12@mail.thefacebook.com> <20141123161120.GB7070@pd.tnic> <1416759411.24312.13@mail.thefacebook.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <1416759411.24312.13@mail.thefacebook.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Nov 23, 2014 at 11:16:51AM -0500, Chris Mason wrote: > It must be: > > commit 6e998916dfe327e785e7c2447959b2c1a3ea4930 > Author: Stanislaw Gruszka > Date: Wed Nov 12 16:58:44 2014 +0100 > > sched/cputime: Fix clock_nanosleep()/clock_gettime() inconsistency > > I'll do two runs to confirm, but it's the only related patch between rc5 and > now. Cool, let me know and I'll revert here too to verify. It might take a while to confirm as it happens only during resume but I could try the fork bomb if I must. >>From looking at it I'm not getting any smarter. We iterate over the threads under a rcu_read_lock() so we should be protected. Unless the sched changes have somehow effect on RCU grace periods but WTH do I know... This is crazy code. Thanks. -- Regards/Gruss, Boris. Sent from a fat crate under my desk. Formatting is fine. --