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[xfs-masters] [Bug 6957] Oops with fil with holes

To: xfs-masters@xxxxxxxxxxx
Subject: [xfs-masters] [Bug 6957] Oops with fil with holes
From: bugme-daemon@xxxxxxxxxxxxxxxxxxx
Date: Thu, 4 Oct 2007 14:39:40 -0700 (PDT)
In-reply-to: <bug-6957-470@http.bugzilla.kernel.org/>
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http://bugzilla.kernel.org/show_bug.cgi?id=6957





------- Comment #10 from dgc@xxxxxxx  2007-10-04 14:39 -------
Following up from Nathan's original comments, I see that the original
report showed:

Filesystem "dm-4": Disabling barriers, not supported by the underlying device
XFS mounting filesystem dm-4
Starting XFS recovery on filesystem: dm-4 (logdev: internal)
Ending XFS recovery on filesystem: dm-4 (logdev: internal)
Access to block zero: fs: <dm-4> inode: 131 start_block : 0 start_off : 0
blkcnt : 0 extent-state : 0 

That barriers were disabled on block device you were using. This could lead
to the sort of problem that you re seeing.

Can this be reproduced on a filesystem that mounts with barriers (should
happen by default) and does not produce the "barriers disabled" warning
on mount?

Also, from comment #9, this is from an extent btree block full of
zeros, which again implies a log recovery problem which initially points
back to the above question about barriers....


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