From: Christoph Hellwig <hch@infradead.org>
To: Dave Chinner <david@fromorbit.com>
Cc: Christoph Hellwig <hch@infradead.org>, xfs@oss.sgi.com
Subject: Re: [regression] stack overflow in xfs_buf_iodone_callbacks
Date: Fri, 22 Jun 2012 12:41:47 -0400 [thread overview]
Message-ID: <20120622164147.GA20617@infradead.org> (raw)
In-Reply-To: <20120621232414.GD10673@dastard>
On Fri, Jun 22, 2012 at 09:24:14AM +1000, Dave Chinner wrote:
> It may have been - I didn't catch the initial cause of the problem
> in my log because it hard-hung the VM and it wasn't in the
> scrollback buffer on the console. All I saw was a corruption error,
> a shutdown and the stack blowing up.
>
> Still, I think there is a real problem here - any persistent device
> error on IO submission can cause this problem to occur....
Yes, I was just trying to ask what actually happened as your original
explanation didn't seem to be possible.
I think the patch below should be enough as a minimal fix to avoid the
stack overflow for 3.5. We'll need a much bigger overhaul of the buffer
error handling after that, though.
Index: xfs/fs/xfs/xfs_buf.c
===================================================================
--- xfs.orig/fs/xfs/xfs_buf.c 2012-06-22 14:20:46.696568355 +0200
+++ xfs/fs/xfs/xfs_buf.c 2012-06-22 14:21:37.733234717 +0200
@@ -1255,7 +1255,7 @@ xfs_buf_iorequest(
*/
atomic_set(&bp->b_io_remaining, 1);
_xfs_buf_ioapply(bp);
- _xfs_buf_ioend(bp, 0);
+ _xfs_buf_ioend(bp, 1);
xfs_buf_rele(bp);
}
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next prev parent reply other threads:[~2012-06-22 16:41 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-21 9:18 [regression] stack overflow in xfs_buf_iodone_callbacks Dave Chinner
2012-06-21 9:21 ` Christoph Hellwig
2012-06-21 9:29 ` Dave Chinner
2012-06-21 10:06 ` Stan Hoeppner
2012-06-21 16:34 ` Christoph Hellwig
2012-06-21 23:24 ` Dave Chinner
2012-06-22 16:41 ` Christoph Hellwig [this message]
2012-06-22 23:39 ` Dave Chinner
2012-06-25 9:06 ` Christoph Hellwig
2012-06-26 2:20 ` Dave Chinner
2012-06-26 7:51 ` Christoph Hellwig
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