From: Christoph Hellwig <hch@infradead.org>
To: Brian Foster <bfoster@redhat.com>
Cc: linux-xfs@vger.kernel.org
Subject: Re: [PATCH v2] xfs: fix iclog release error check race with shutdown
Date: Tue, 18 Feb 2020 13:00:59 -0800 [thread overview]
Message-ID: <20200218210059.GA28343@infradead.org> (raw)
In-Reply-To: <20200218175425.20598-1-bfoster@redhat.com>
On Tue, Feb 18, 2020 at 12:54:25PM -0500, Brian Foster wrote:
> Prior to commit df732b29c8 ("xfs: call xlog_state_release_iclog with
> l_icloglock held"), xlog_state_release_iclog() always performed a
> locked check of the iclog error state before proceeding into the
> sync state processing code. As of this commit, part of
> xlog_state_release_iclog() was open-coded into
> xfs_log_release_iclog() and as a result the locked error state check
> was lost.
>
> The lockless check still exists, but this doesn't account for the
> possibility of a race with a shutdown being performed by another
> task causing the iclog state to change while the original task waits
> on ->l_icloglock. This has reproduced very rarely via generic/475
> and manifests as an assert failure in __xlog_state_release_iclog()
> due to an unexpected iclog state.
>
> Restore the locked error state check in xlog_state_release_iclog()
> to ensure that an iclog state update via shutdown doesn't race with
> the iclog release state processing code.
>
> Fixes: df732b29c807 ("xfs: call xlog_state_release_iclog with l_icloglock held")
> Reported-by: Zorro Lang <zlang@redhat.com>
> Signed-off-by: Brian Foster <bfoster@redhat.com>
Looks good:
Reviewed-by: Christoph Hellwig <hch@lst.de>
next prev parent reply other threads:[~2020-02-18 21:01 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-18 17:54 [PATCH v2] xfs: fix iclog release error check race with shutdown Brian Foster
2020-02-18 21:00 ` Christoph Hellwig [this message]
2020-02-18 21:52 ` Dave Chinner
2020-02-18 22:36 ` Christoph Hellwig
2020-02-19 3:00 ` Dave Chinner
2020-02-19 18:46 ` Christoph Hellwig
2020-02-19 13:12 ` Brian Foster
2020-02-19 21:51 ` Darrick J. Wong
2020-02-20 12:41 ` Brian Foster
2020-02-20 15:43 ` Christoph Hellwig
2020-02-20 16:02 ` Brian Foster
2020-02-20 3:32 ` Dave Chinner
2020-02-19 21:21 ` Christoph Hellwig
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