Re: [PATCH v2 1/3] fstests: use udevadm settle after pvremove
From: Eryu Guan
Date: Sun Aug 15 2021 - 08:36:18 EST
On Wed, Aug 11, 2021 at 08:45:10AM -0700, Luis Chamberlain wrote:
> As with creation, we also need to use udevadm settle
> when removing a pv, otherwise we can trip on races with
> module removals for the block devices in use.
>
> This reduces the amount of time in which a block device
> module refcnt for test modules such as scsi_debug spends
> outside of 0.
>
> Races with the refcnt being greater than 0 means module
> removal can fail causing false positives. This helps
> ensure that the pv is really long gone. These issues
> are tracked for scsi_debug [0] and later found to be a
> generic issue regardless of filesystem with pvremove [1].
>
> Using udevadm settle *helps*, it does not address all
> possible races with the refcnt as noted in the generic
> bug entry [1].
>
> [0] https://bugzilla.kernel.org/show_bug.cgi?id=212337
> [1] https://bugzilla.kernel.org/show_bug.cgi?id=214015
> Signed-off-by: Luis Chamberlain <mcgrof@xxxxxxxxxx>
I applied this patch for this week's update.
Thanks,
Eryu
> ---
> tests/generic/081 | 5 ++++-
> tests/generic/108 | 1 +
> tests/generic/459 | 1 +
> 3 files changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/tests/generic/081 b/tests/generic/081
> index f795b2c1..8e552074 100755
> --- a/tests/generic/081
> +++ b/tests/generic/081
> @@ -12,6 +12,7 @@ _begin_fstest auto quick
> # Override the default cleanup function.
> _cleanup()
> {
> + local pv_ret
> cd /
> rm -f $tmp.*
>
> @@ -34,7 +35,9 @@ _cleanup()
> $UMOUNT_PROG $mnt >> $seqres.full 2>&1
> $LVM_PROG vgremove -f $vgname >>$seqres.full 2>&1
> $LVM_PROG pvremove -f $SCRATCH_DEV >>$seqres.full 2>&1
> - test $? -eq 0 && break
> + pv_ret=$?
> + $UDEV_SETTLE_PROG
> + test $pv_ret -eq 0 && break
> sleep 2
> done
> }
> diff --git a/tests/generic/108 b/tests/generic/108
> index 7dd426c1..b7797e8f 100755
> --- a/tests/generic/108
> +++ b/tests/generic/108
> @@ -21,6 +21,7 @@ _cleanup()
> $UMOUNT_PROG $SCRATCH_MNT >>$seqres.full 2>&1
> $LVM_PROG vgremove -f $vgname >>$seqres.full 2>&1
> $LVM_PROG pvremove -f $SCRATCH_DEV $SCSI_DEBUG_DEV >>$seqres.full 2>&1
> + $UDEV_SETTLE_PROG
> _put_scsi_debug_dev
> rm -f $tmp.*
> }
> diff --git a/tests/generic/459 b/tests/generic/459
> index e5e5e9ab..5b44e245 100755
> --- a/tests/generic/459
> +++ b/tests/generic/459
> @@ -29,6 +29,7 @@ _cleanup()
> $UMOUNT_PROG $SCRATCH_MNT >>$seqres.full 2>&1
> $LVM_PROG vgremove -ff $vgname >>$seqres.full 2>&1
> $LVM_PROG pvremove -ff $SCRATCH_DEV >>$seqres.full 2>&1
> + $UDEV_SETTLE_PROG
> }
>
> # Import common functions.
> --
> 2.30.2