From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sasha Levin Subject: Re: fs: use after free in /proc/pid/mountinfo Date: Wed, 09 Jul 2014 18:10:47 -0400 Message-ID: <53BDBDE7.8090600@oracle.com> References: <53B3F331.7090204@oracle.com> <53B4CAB8.5070407@oracle.com> <53B6C051.2060704@oracle.com> <20140706100420.GB3589@osiris> <20140709142406.GA27561@osiris> <20140709133138.c523aa03883be5417a4d19a4@linux-foundation.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: David Rientjes , linux-fsdevel , Al Viro , Jan Kara , Dave Jones , LKML , Linus Torvalds To: Andrew Morton , Heiko Carstens Return-path: In-Reply-To: <20140709133138.c523aa03883be5417a4d19a4@linux-foundation.org> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-fsdevel.vger.kernel.org On 07/09/2014 04:31 PM, Andrew Morton wrote: > On Wed, 9 Jul 2014 16:24:06 +0200 Heiko Carstens wrote: > >> > 058504edd026 ("fs/seq_file: fallback to vmalloc allocation") is suspected to >> > cause a crash. Actually I can't reprocude the crash nor would I be able to >> > tell how the commit could cause the crash. >> > Anyway, I'll be offline for the next 2.5 weeks. So if Sasha could confirm >> > that reverting the patch actually does fix the crash, please revert the >> > commit, unless somebody else can make sense of the report of course. >> > >> > I'm still wondering how Sasha could reproduce the crash. > This really sucks :( > > I suppose I'll queue up a revert of 058504edd026 as a for-3.16 bandaid. > > Sasha, it would be great if you could delve a bit further into this, > see if we can identify a way for others to reproduce the bug. > > Did you test that little patchlet which Heiko sent? I've been trying, but as there isn't an easy way to reproduce it, breakage elsewhere in -next (there is a long list) is slowing me down. I'll revert back to the -next where I've initially observed this issue and will retry. Thanks, Sasha