TEST-37-RUNTIMEDIRECTORYPRESERVE gets stuck on focal-s390x, focal-ppc64el #21458
Description
For a couple of weeks now s390x and ppc64el runs of integration tests seem to timeout pretty consistently (but not 100% of the time). Adding some timestamps (#21455), it seems the whole test suite runs in a few minutes, but then gets stuck for ~3 hours:
[01:35:40] --x-- Running TEST-01-BASIC --x--
[01:36:16] --x-- Running TEST-02-UNITTESTS --x--
[01:39:27] --x-- Running TEST-03-JOBS --x--
[01:39:39] --x-- Running TEST-04-JOURNAL --x--
[01:39:55] --x-- Running TEST-05-RLIMITS --x--
[01:39:56] --x-- Running TEST-06-SELINUX --x--
[01:39:56] --x-- Running TEST-07-ISSUE-1981 --x--
[01:39:58] --x-- Running TEST-08-ISSUE-2730 --x--
[01:40:31] --x-- Running TEST-09-ISSUE-2691 --x--
[01:40:32] --x-- Running TEST-10-ISSUE-2467 --x--
[01:40:43] --x-- Running TEST-11-ISSUE-3166 --x--
[01:40:44] --x-- Running TEST-12-ISSUE-3171 --x--
[01:40:47] --x-- Running TEST-13-NSPAWN-SMOKE --x--
[01:40:49] --x-- Running TEST-14-MACHINE-ID --x--
[01:40:51] --x-- Running TEST-15-DROPIN --x--
[01:41:02] --x-- Running TEST-16-EXTEND-TIMEOUT --x--
[01:42:08] --x-- Running TEST-17-UDEV --x--
[01:42:08] --x-- Running TEST-18-FAILUREACTION --x--
[01:42:10] --x-- Running TEST-19-DELEGATE --x--
[01:42:11] --x-- Running TEST-20-MAINPIDGAMES --x--
[01:42:15] --x-- Running TEST-22-TMPFILES --x--
[01:42:19] --x-- Running TEST-23-TYPE-EXEC --x--
[01:42:20] --x-- Running TEST-24-CRYPTSETUP --x--
[01:42:55] --x-- Running TEST-26-SETENV --x--
[01:42:57] --x-- Running TEST-27-STDOUTFILE --x--
[01:42:58] --x-- Running TEST-28-PERCENTJ-WANTEDBY --x--
[01:43:00] --x-- Running TEST-29-PORTABLE --x--
[01:43:06] --x-- Running TEST-30-ONCLOCKCHANGE --x--
[01:43:07] --x-- Running TEST-31-DEVICE-ENUMERATION --x--
[01:43:07] --x-- Running TEST-32-OOMPOLICY --x--
[01:43:08] --x-- Running TEST-33-CLEAN-UNIT --x--
[01:43:10] --x-- Running TEST-34-DYNAMICUSERMIGRATE --x--
[01:43:14] --x-- Running TEST-37-RUNTIMEDIRECTORYPRESERVE --x--
autopkgtest [04:22:20]: ERROR: timed out on command ...