sched_rr_get_interval01 in ubuntu_ltp_syscalls flaky with T-3.13 (TFAIL: /proc/sys/kernel/sched_rr_timeslice_ms != 100 got 25)

[Po-Hsu Lin]

Issue found with T-3.13.0-193

This failure should not be considered as a regression, as we didn't run ubuntu_ltp_syscalls on this kernel until we have openstack support added recently.

This test is only failing on generic kernel.

INFO: Test start time: Fri Aug 25 10:57:42 UTC 2023
COMMAND: /opt/ltp/bin/ltp-pan -q -e -S -a 22978 -n 22978 -f /tmp/ltp-28i0qQb37V/alltests -l /dev/null -C /dev/null -T /dev/null
LOG File: /dev/null
FAILED COMMAND File: /dev/null
TCONF COMMAND File: /dev/null
Running tests.......
tst_test.c:1560: TINFO: Timeout per run is 0h 00m 30s
sched_rr_get_interval01.c:40: TINFO: Testing variant: vDSO or syscall with libc spec
sched_rr_get_interval01.c:57: TPASS: sched_rr_get_interval() passed
sched_rr_get_interval01.c:65: TPASS: Time quantum 0s 100000000ns
sched_rr_get_interval01.c:72: TFAIL: /proc/sys/kernel/sched_rr_timeslice_ms != 100 got 25
sched_rr_get_interval01.c:40: TINFO: Testing variant: syscall with old kernel spec
sched_rr_get_interval01.c:57: TPASS: sched_rr_get_interval() passed
sched_rr_get_interval01.c:65: TPASS: Time quantum 0s 100000000ns
sched_rr_get_interval01.c:72: TFAIL: /proc/sys/kernel/sched_rr_timeslice_ms != 100 got 25

HINT: You _MAY_ be missing kernel fixes:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=975e155ed873

Summary:
passed 4
failed 2
broken 0
skipped 0
warnings 0
INFO: ltp-pan reported some tests FAIL
LTP Version: 20230516
INFO: Test end time: Fri Aug 25 10:57:42 UTC 2023