linux-kernel - Re: general protection fault in put

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Message-ID: <20190327225102.GB29086@twin.jikos.cz>
Date:   Wed, 27 Mar 2019 23:51:03 +0100
From:   David Sterba <dsterba@...e.cz>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     syzbot <syzbot+1145ec2e23165570c3ac@...kaller.appspotmail.com>,
        akpm@...ux-foundation.org, clm@...com, dan.carpenter@...cle.com,
        dave@...olabs.net, dhowells@...hat.com, dsterba@...e.com,
        dvyukov@...gle.com, ebiederm@...ssion.com, jbacik@...com,
        ktkhai@...tuozzo.com, ktsanaktsidis@...desk.com,
        linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, manfred@...orfullife.com, mhocko@...e.com,
        nborisov@...e.com, penguin-kernel@...ove.SAKURA.ne.jp,
        rppt@...ux.vnet.ibm.com, sfr@...b.auug.org.au, shakeelb@...gle.com,
        syzkaller-bugs@...glegroups.com, vdavydov.dev@...il.com
Subject: Re: general protection fault in put_pid

On Wed, Mar 27, 2019 at 01:27:12PM -0700, Matthew Wilcox wrote:
> On Wed, Mar 27, 2019 at 01:10:01PM -0700, syzbot wrote:
> > syzbot has bisected this bug to:
> > 
> > commit b9b8a41adeff5666b402996020b698504c927353
> > Author: Dan Carpenter <dan.carpenter@...cle.com>
> > Date:   Mon Aug 20 08:25:33 2018 +0000
> > 
> >     btrfs: use after free in btrfs_quota_enable
> 
> Not plausible.  Try again.

Agreed, grep for 'btrfs' in the console log does not show anything, ie.
no messages, slab caches nor functions on the stack.