linux-kernel - Re: xfstest failure with xfs, dax and v4.4-rc3

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Message-ID: <20151203065127.GB26718@dastard>
Date:	Thu, 3 Dec 2015 17:51:27 +1100
From:	Dave Chinner <david@...morbit.com>
To:	Jeff Moyer <jmoyer@...hat.com>
Cc:	Ross Zwisler <ross.zwisler@...ux.intel.com>, xfs@....sgi.com,
	Brian Foster <bfoster@...hat.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: xfstest failure with xfs, dax and v4.4-rc3

On Wed, Dec 02, 2015 at 10:12:29AM -0500, Jeff Moyer wrote:
> Dave Chinner <david@...morbit.com> writes:
> 
> > On Tue, Dec 01, 2015 at 03:43:46PM -0700, Ross Zwisler wrote:
> >> I'm seeing a new intermittent xfstests failure with v4.4-rc3 using XFS and
> >> DAX.  The test that is failing is generic/083, and it fails about 50% of the
> >> time in my setup.  Here's the output:
> >> 
> >> FSTYP         -- xfs (debug)
> >> PLATFORM      -- Linux/x86_64 lorwyn 4.4.0-rc3
> >> MKFS_OPTIONS  -- -f -bsize=4096 /dev/pmem0p2
> >> MOUNT_OPTIONS -- -o dax -o context=system_u:object_r:nfs_t:s0 /dev/pmem0p2
> >> /mnt/xfstests_scratch
> >> 
> >> generic/083 2s ... 2s
>    ^^^^^^^
> >> _check_xfs_filesystem: filesystem on /dev/pmem0p2 is inconsistent (r) (see
> >> /root/xfstests/results//generic/083.full)
> >> Ran: generic/083
> >> Failures: generic/083
> >> Failed 1 of 1 tests
> >
> > $ grep 083  tests/xfs/group
> > 083 dangerous_fuzzers
> > $
> 
> That's great, but Ross reported an issues with *generic*/083.  ;-)
> 
> /me hands Dave more coffee.

Ah, some days I need more coffee than others :/

As it is, that test does not fail on my DAX testing on RAM disks.
ISTR it failing up until recently, though. Yeah:

Last login: Tue Nov 17 08:45:55 2015 from 192.168.1.103
$ cd ~/src/xfstests-dev; sudo mkfs.xfs -f /dev/ram0 ; sudo xfs_admin -U generate /dev/ram0 ; sudo MOUNT_OPTIONS="-o dax" ./check -g auto
SECTION       -- xfs
FSTYP         -- xfs (debug)
PLATFORM      -- Linux/x86_64 test4 4.3.0-dgc+
MKFS_OPTIONS  -- -f -bsize=4096 /dev/ram1
MOUNT_OPTIONS -- -o dax /dev/ram1 /mnt/scratch
....
generic/083 2s ... 1s
_check_xfs_filesystem: filesystem on /dev/ram1 is inconsistent (c) (see /home/dave/src/xfstests-dev/results//xfs/generic/083.full)
_check_xfs_filesystem: filesystem on /dev/ram1 is inconsistent (r) (see /home/dave/src/xfstests-dev/results//xfs/generic/083.full)
....

But as I ran earlier today when testing the ENOSPC fix:

PLATFORM      -- Linux/x86_64 test4 4.4.0-rc2-dgc+
MKFS_OPTIONS  -- -f -bsize=4096 /dev/ram1
MOUNT_OPTIONS -- -o dax /dev/ram1 /mnt/scratch
....
generic/083 1s ... 2s
....

So I'm seeing that the current 4.4-rc2 + my local dev tree patches
appear to have fixed whatever was causing generic/083 to fail
here...

What version of xfsprogs are you using, Ross?

Cheers,

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