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SubjectRe: [BUG] 2.6.0-test4-mm1: NFS+XFS=data corruption
Steve Lord <lord@sgi.com> wrote:
>
> > > Is this enough information to help find the cause of the bug? If not,
> > > it might be several days (if I'm unlucky, maybe even a week or two)
> > > before I have time to do anything more...
> > >
> >
> > -mm kernels have O_DIRECT-for-NFS patches in them. And some versions of
> > RPM use O_DIRECT. Whether O_DIRECT makes any difference at the server end
> > I do not know, but it would be useful if you could repeat the test on stock
> > 2.6.0-test4.
> >
> > Alternatively, run
> >
> > export LD_ASSUME_KERNEL=2.2.5
> >
> > before running RPM. I think that should tell RPM to not try O_DIRECT.
>
> I doubt the NFS client is O_DIRECT capable here, I have run some rpm
> builds over nfs to 2.6.0-test4 and an xfs filesystem, everything is
> behaving so far. I will try mm1 tomorrow.
>
> Do we know if this NFS V3 or V2 by the way?

OK, sorry for the noise. It appears that this is due to the AIO patches in
-mm. fsx-linux fails instantly on nfsv3 to localhost on XFS. It's OK on
ext2 for some reason.

Binary searching reveals that the offending patch is
O_SYNC-speedup-nolock-fix.patch

testcase:

mkfs.xfs -f /dev/hda5
mount /dev/hda5 /mnt/hda5
chmod a+rw /mnt/hda5
service nfs start
mount localhost:/mnt/hda5 /mnt/localhost
cd /mnt/localhost
fsx-linux foo


truncating to largest ever: 0x13e76
READ BAD DATA: offset = 0x18f13, size = 0xee06, fname = foo
OFFSET GOOD BAD RANGE
0x26000 0x02eb 0x0000 0x 0
operation# (mod 256) for the bad data unknown, check HOLE and EXTEND ops
0x26001 0xeb02 0x0000 0x 1
operation# (mod 256) for the bad data unknown, check HOLE and EXTEND ops
0x26002 0x0228 0x0000 0x 2
operation# (mod 256) for the bad data unknown, check HOLE and EXTEND ops
-
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