linux-kernel - Re: xfs: list corruption in xfs_setup

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Message-ID: <20171101213230.GR5858@dastard>
Date:   Thu, 2 Nov 2017 08:32:30 +1100
From:   Dave Chinner <david@...morbit.com>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     Dave Chinner <dchinner@...hat.com>, darrick.wong@...cle.com,
        linux-xfs@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Christoph Hellwig <hch@....de>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: xfs: list corruption in xfs_setup_inode()

On Wed, Nov 01, 2017 at 04:07:01PM +1100, Dave Chinner wrote:
> On Tue, Oct 31, 2017 at 09:43:03PM -0700, Cong Wang wrote:
> > On Tue, Oct 31, 2017 at 8:05 PM, Dave Chinner <david@...morbit.com> wrote:
> > > On Tue, Oct 31, 2017 at 06:51:08PM -0700, Cong Wang wrote:
> > >> >> Please let me know if I can provide any other information.
> > >> >
> > >> > How do you reproduce the problem?
> > >>
> > >> The warning is reported via ABRT email, we don't know what was
> > >> happening at the time of crash.
> > >
> > > Which makes it even harder to track down. Perhaps you should
> > > configure the box to crashdump on such a failure and then we
> > > can do some post-failure forensic analysis...
> > 
> > Yeah.
> > 
> > We are trying to make kdump working, but even if kdump works
> > we still can't turn on panic_on_warn since this is production
> > machine.
> 
> Hmmm. Ok, maybe you could leave a trace of the xfs_iget* trace
> points running and check the log tail for unusual events around the
> time of the next crash. e.g. xfs_iget_reclaim_fail events. That
> might point us to a potential interaction we can look at more
> closely. I'd also suggest slab poisoning as well, as that will
> catch other lifecycle problems that could be causing list
> corruptions such as use-after-free.

FWIW, I note that you are reporting another memory
corruption/use-after-free related crash in the pipe_inode_info
structure on these same machines.  I'd suggest that you start with
the premise that this list corruption has the same root cause...

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com