logrotate_sh in commands of ubuntu_ltp_stable failed with "grep -q forced from command line (5 rotations) tst_logrotate.out failed unexpectedly" on O

[Po-Hsu Lin]

Issue found since Oracular 6.11.0-8.8, the LTP build successfully since this version.

Test log:
 startup='Tue Nov 26 15:25:19 2024'
 logrotate_tests 1 TINFO: Running: logrotate_tests.sh
 logrotate_tests 1 TINFO: Tested kernel: Linux ubuntu 6.11.0-1005-raspi #5-Ubuntu SMP PREEMPT_DYNAMIC Fri Nov 22 13:24:30 UTC 2024 aarch64 aarch64 aarch64 GNU/Linux
 logrotate_tests 1 TINFO: Using /tmp/ltp-zEHMABQtkJ/LTP_logrotate_tests.PRskJA6rot as tmpdir (tmpfs filesystem)
 logrotate_tests 1 TINFO: timeout per run is 0h 5m 0s
 logrotate_tests 1 TPASS: grep -q reading config file tst_logrotate.conf tst_logrotate.out passed as expected
 logrotate_tests 1 TFAIL: grep -q forced from command line (5 rotations) tst_logrotate.out failed unexpectedly
 logrotate_tests 1 TPASS: grep -E -q compressing new|log with tst_logrotate.out passed as expected
 logrotate_tests 1 TPASS: [ -f /var/log/tst_logfile.1.gz ] passed as expected
 logrotate_tests 2 TINFO: sleep 1 min to wait for rotating logs
 logrotate_tests 2 TPASS: [ -f /var/log/tst_largelogfile.1.gz ] passed as expected
 logrotate_tests 3 TINFO: AppArmor enabled, this may affect test results
 logrotate_tests 3 TINFO: it can be disabled with TST_DISABLE_APPARMOR=1 (requires super/root)
 logrotate_tests 3 TINFO: loaded AppArmor profiles: none

 Summary:
 passed 4
 failed 1
 broken 0
 skipped 0
 warnings 0

[Po-Hsu Lin (cypressyew)]

Patch submitted upstream: https://lists.linux.it/pipermail/ltp/2024-November/040999.html