Re: WARNING: CPU: 2 PID: 20539 at fs/iomap.c:954 iomap_dio_rw+0x39a/0x3b0

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Hi Jeff,

On Tue, Mar 07, 2017 at 04:35:59PM -0500, Jeff Layton wrote:
> I was doing an xfstests run on xfs with v4.11.0-rc1, and these two
> warnings popped. Looks like invalidate_inode_pages2_range failed? A
> small patch to print the error there showed that it was returning
> -EBUSY.
> 
> Pretty easy to reproduce by running xfstests generic/095 on a KVM guest
> running v4.11.0-rc1.
> 
> [  591.302422] run fstests generic/095 at 2017-03-07 15:38:32
> [  591.452226] XFS (vda6): Unmounting Filesystem
> [  591.825895] XFS (vda6): Mounting V5 Filesystem
> [  591.841560] XFS (vda6): Ending clean mount
> [  592.127155] ------------[ cut here ]------------
> [  592.133775] WARNING: CPU: 2 PID: 20539 at fs/iomap.c:954 iomap_dio_rw+0x39a/0x3b0

and

> [  592.202828] WARNING: CPU: 0 PID: 20540 at fs/iomap.c:896 iomap_dio_rw+0x1b1/0x3b0

IIRC, these warnings are kind of "known issue", they're filtered out by
generic/095 and should not cause the test to fail. You can check the
comments before filter_xfs_dmesg() function in generic/095 test.

Did generic/095 fail for you due to dmesg check? If so I think there
might be an fstests bug. My generic/095 run on 4.11-rc1 kernel triggered
these warnings too, but test itself didn't report failure.

Thanks,
Eryu
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