cve-2017-17053 from ubuntu_ltp_cve passed but marked as failed due to "/opt/ltp/runltp: 920: /opt/ltp/runltp: Cannot fork"

[Po-Hsu Lin]

Issue found on X-4.4.0-242.276 and X-aws-4.4.0-1158.173 in sru-20230612 on specific nodes:
 * X-4.4 vought
 * X-aws-4.4 i3.metal, r5.metal

Test output:
COMMAND: /opt/ltp/bin/ltp-pan -e -S -a 59705 -n 59705 -p -f /tmp/ltp-fksY2j1FHc/alltests -l /opt/ltp/results/LTP_RUN_ON-2023_07_07-10h_41m_28s.log -C /opt/ltp/output/LTP_RUN_ON-2023_07_07-10h_41m_28s.failed -T /opt/ltp/output/LTP_RUN_ON-2023_07_07-10h_41m_28s.tconf
LOG File: /opt/ltp/results/LTP_RUN_ON-2023_07_07-10h_41m_28s.log
FAILED COMMAND File: /opt/ltp/output/LTP_RUN_ON-2023_07_07-10h_41m_28s.failed
TCONF COMMAND File: /opt/ltp/output/LTP_RUN_ON-2023_07_07-10h_41m_28s.tconf
Running tests.......
<<<test_start>>>
tag=cve-2017-17053 stime=1688726488
cmdline="cve-2017-17053"
contacts=""
analysis=exit
<<<test_output>>>
incrementing stop
tst_test.c:1560: TINFO: Timeout per run is 0h 00m 30s
cve-2017-17053.c:144: TPASS: kernel survived
tst_test.c:1606: TINFO: Killed the leftover descendant processes

Summary:
passed 1
failed 0
broken 0
skipped 0
warnings 0
<<<execution_status>>>
initiation_status="ok"
duration=5 termination_type=exited termination_id=0 corefile=no
cutime=13 cstime=485
<<<test_end>>>
INFO: ltp-pan reported all tests PASS
LTP Version: 20230516
/opt/ltp/runltp: 927: /opt/ltp/runltp: Cannot fork
/opt/ltp/runltp: 950: /opt/ltp/runltp: Cannot fork
$ echo $?
2

I can reproduce this with 4.4.0-210-generic so this is not a regression. Probably something has to do with LTP update (https://lists.ubuntu.com/archives/kernel-team/2023-June/140734.html)