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Wong wrote: > On Fri, Feb 06, 2026 at 08:40:07AM +0000, Shinichiro Kawasaki wrote: > > Hello Darrick, > >=20 > > Recently, my fstests run for null_blk (8GiB size) as SCRATCH_DEV failed= at > > xfs/802 [3]. I took a look and observed following points: > >=20 > > 1) xfs_scrub_all command ran as expected. Even though SCRATCH_DEV is mo= unted, > > it did not scrub SCRATCH_DEV. Hence the failure. > > 2) xfs_scrub_all uses lsblk command to list all mounted xfs filesystems= [1]. > > However, lsblk command does not report that SCRATCH_DEV is mounted a= s xfs. > > 3) I leanred that lsblk command refers to udev database [2], and udev d= atabase > > sometimes fails to update the filesystem information. This is the ca= se for > > the null_blk as SCRATCH_DEV on my test nodes. >=20 > Hrm. I wonder if we're starting xfs_scrub_all too soon after the > _scratch_cycle_mount? It's possible that if udev is running slowly, > it won't yet have poked blkid to update its cache, in which case lsblk > won't show it. >=20 > If you add _udev_wait after _scratch_cycle_mount, does the "Health > status has not beel collected" problem go away? I couldn't reproduce > this specific problem on my test VMs, but the "udev hasn't caught up and > breaks fstests" pattern is very familiar. :/ Unfortunately, no. I made the change below in the test case, but I still se= e the "Health status has not beel collected" message. diff --git a/tests/xfs/802 b/tests/xfs/802 index fc4767a..77e09f8 100755 --- a/tests/xfs/802 +++ b/tests/xfs/802 @@ -131,6 +131,8 @@ systemctl cat "$new_scruball_svc" >> $seqres.full # Cycle mounts to clear all the incore CHECKED bits. _scratch_cycle_mount =20 +_udev_wait $SCRATCH_DEV + echo "Scrub Everything" run_scrub_service "$new_scruball_svc" =20 I also manually mounted the null_blk device with xfs, and ran "udevadm sett= le". Then still lsblk was failing to report fstype for the null_blk device (FYI,= I use Fedora 43 to recreate the failure). >=20 > > Based on these observations, I think there are two points to improve: > >=20 > > 1) I found "blkid -p" command reports that null_blk is mounted as xfs, = even when > > lsblk does not report it. I think xfs_scrub_all can be modified to u= se > > "blkid -p" instead of lsblk to find out xfs filesystems mounted. > > 2) When there are other xfs filesystems on the test node than TEST_DEV = or > > SCRATCH_DEV, xfs_scrub_all changes the status of them. This does not= sound > > good to me since it affects system status out of the test targets bl= ock > > devices. I think he test case can be improved to check that there is= no other > > xfs filesystems mounted other than TEST_DEV or SCRATCH_DEV/s. If not= , the > > test case should be skipped. >=20 > I wonder if a better solution would be to add to xfs_scrub_all a > --restrict $SCRATCH_MNT --restrict $TEST_DIR option so that it ignores > mounts that aren't under test? Yes, I agree that it will be the better solution since the test case will n= ot be skipped even when there are other xfs filesystems mounted.=