linux-kernel - Re: WARNING in kmem_cache

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Message-ID: <20180408060140.GB16007@bombadil.infradead.org>
Date:   Sat, 7 Apr 2018 23:01:40 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     syzbot <syzbot+75397ee3df5c70164154@...kaller.appspotmail.com>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs@...glegroups.com, Al Viro <viro@...iv.linux.org.uk>
Subject: Re: WARNING in kmem_cache_free

On Fri, Apr 06, 2018 at 03:33:36PM +0200, Dmitry Vyukov wrote:
> On Fri, Apr 6, 2018 at 3:24 PM, syzbot
> <syzbot+75397ee3df5c70164154@...kaller.appspotmail.com> wrote:
> > Unfortunately, I don't have any reproducer for this crash yet.
> 
> Interesting type of bug, I think we see this for the first time.

Can you focus syzbot to try to find a reproducer?  This seems to be
produced by calling mount() with a pathname that's somewhere between,
say, 3950 & 4100 bytes long from a compat 32-bit task.