ovl-refcnt.sh in ubuntu_overlayfs_smoke_test failed when trying to umount (target is busy) on Lunar

[Po-Hsu Lin]

Test failed with Lunar since 6.2.0-31.31 (the first time we test it with the updated ubuntu_overlayfs_smoke_test and with the proxy issue bug 2030958 fixed):

 Running 'sudo -iu ubuntu /home/ubuntu/autotest/client/tmp/ubuntu_overlayfs_smoke_test/src/overlay-shiftfs-tests/tests/ovl-refcnt.sh'
Creating ovl-test

Retrieving image: Unpack: 100% (2.01GB/s)

Retrieving image: Unpack: 100% (2.01GB/s)

Starting ovl-test
 + '[' 'proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)' == '' ']'
 + mkdir -p /tmp/ovlissue/mountpointtmp
 + mount -t tmpfs tmpfs /tmp/ovlissue/mountpointtmp
 + mkdir -p /tmp/ovlissue/mountpointtmp/firstupperdir
 + mkdir -p /tmp/ovlissue/mountpointtmp/firstworkdir
 + mkdir -p /tmp/ovlissue/mountpointtmp/firstunion
 + mount -t overlay overlay -o lowerdir=/,upperdir=/tmp/ovlissue/mountpointtmp/firstupperdir,workdir=/tmp/ovlissue/mountpointtmp/firstworkdir /tmp/ovlissue/mountpointtmp/firstunion
 + mkdir -p /tmp/ovlissue/mountpointtmp/firstunion/tmp/ovlissue/mountpointtmp
 + mount --bind /tmp/ovlissue/mountpointtmp /tmp/ovlissue/mountpointtmp/firstunion/tmp/ovlissue/mountpointtmp
 + mkdir /tmp/ovlissue/mountpointtmp/firstunion/tmp/ovlissue/mountpointtmp/secondupperdir
 + mkdir /tmp/ovlissue/mountpointtmp/firstunion/tmp/ovlissue/mountpointtmp/workdir
 + mkdir /tmp/ovlissue/mountpointtmp/firstunion/tmp/ovlissue/mountpointtmp/secondunion
 + mount -t overlay overlay -o lowerdir=/tmp/ovlissue/mountpointtmp/firstunion,upperdir=/tmp/ovlissue/mountpointtmp/firstunion/tmp/ovlissue/mountpointtmp/secondupperdir,workdir=/tmp/ovlissue/mountpointtmp/firstunion/tmp/ovlissue/mountpointtmp/workdir /tmp/ovlissue/mountpointtmp/firstunion/tmp/ovlissue/mountpointtmp/secondunion
 + chroot /tmp/ovlissue/mountpointtmp/firstunion/tmp/ovlissue/mountpointtmp/secondunion true
 + umount /tmp/ovlissue/mountpointtmp/firstunion/tmp/ovlissue/mountpointtmp/secondunion
 umount: /tmp/ovlissue/mountpointtmp/firstunion/tmp/ovlissue/mountpointtmp/secondunion: target is busy.

Pushing /var/lib/snapd/hostfs/home/ubuntu/test.sh to /root/test.sh: 100% (4.69GB/s)

FAIL

[Po-Hsu Lin (cypressyew)]

This issue has been fixed with commit
UBUNTU: SAUCE: overlayfs: fix reference count mismatch
in -32

We can close this in the next cycle.