[PATCH 0/4] aborted fstests may leave frozen fs behind

[Amir Goldstein <amir73il@gmail.com>]

Zorro,

I was analyzing a flakey test failure of xfs/517 and
fell down a rabbit hole of frzon fs cleanups.

Patch 4 fixes the false positive I was running into occasionnaly
in cases where xfs/517 was completed successfully.

While testing, I found out that if I interrupt the run of xfs/517
this often leaves the fs frozen. So I did an audit of the tests that
freeze the fs and found that very few of them unfreeze fs on interrupt.

This is an attempt to provide a robust solution that minimizes the
risks of that happenning.

I tested that all the tests in the 'freeze' group that I modified
run to completion.

I did not try to interrupt all the rest of the tests, because
interrupting a test at exact time that it is frozen is quite hard.

I did test that interrupting xfs/517 several times did not leave the fs
frozen.  Before the changes, it was rather easy to get it to leave a
frozen fs behind, because the freeze_loop() keeps the fs frozon around
half of the time that the test is running.

As far as I can tell, this series is orthogonal to Dave's _cleanup()
work [1]. It adds missing cleanups to tests (e.g. xfs/422) that could
later make use of the common cleanup helpers (i.e. _fsstress_cleanup).
However, the common _fsstress_cleanup() helper will need to kill without
waiting. To my understand, Dave was also against waiting in the cleanup
helper.

Thanks,
Amir.

[1] https://lore.kernel.org/fstests/20220524073411.1943480-1-david@fromorbit.com/

Amir Goldstein (4):
  fstests: add missing _require_freeze() to tests
  fstests: make sure to unfreeze test and scratch mounts
  xfs/{422,517}: add missing killall to _cleanup()
  xfs/{422,517}: fix false positive failure

 check             | 14 ++++++++------
 common/rc         |  5 +++--
 tests/generic/390 |  2 --
 tests/xfs/011     |  2 --
 tests/xfs/119     |  1 +
 tests/xfs/318     |  3 ++-
 tests/xfs/325     |  3 ++-
 tests/xfs/422     | 16 ++++++++++++++--
 tests/xfs/438     |  2 +-
 tests/xfs/517     |  8 ++++++--
 10 files changed, 37 insertions(+), 19 deletions(-)

-- 
2.25.1