pipe15 from ubuntu_ltp_syscalls failed with T-lts / X

[Po-Hsu Lin]

This issue pops up after updating to the latest tip of LTP test suite (commit 776b57984 "rwtest: Remove df symlink check")

This is a new test case added in this Nov. https://github.com/linux-test-project/ltp/commit/4e3bb6b7baa462056c890134e9deef0cd343463b

It's only failing with T-lts (4.4.0-248.282~14.04.1) and X (4.4.0-248.282).

Test log:
INFO: Test start time: Wed Dec 6 08:44:46 UTC 2023
COMMAND: /opt/ltp/bin/ltp-pan -q -e -S -a 17743 -n 17743 -f /tmp/ltp-sAlLAYWC1I/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:1690: TINFO: LTP version: 20230929
tst_test.c:1576: TINFO: Timeout per run is 0h 00m 30s
pipe15.c:57: TINFO: Soft limit for pipes: 16384 pages
pipe15.c:58: TINFO: Buffer size: 65536 byte
pipe15.c:59: TINFO: Creating 1024 pipes
pipe15.c:34: TINFO: Soft-limited buffer size: 4096 bytes
Test timeouted, sending SIGKILL!
tst_test.c:1629: TINFO: If you are running on slow machine, try exporting LTP_TIMEOUT_MUL > 1
tst_test.c:1630: TBROK: Test killed! (timeout?)

HINT: You _MAY_ be missing kernel fixes:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=46c4c9d1beb7
INFO: ltp-pan reported some tests FAIL
LTP Version: 20230929
INFO: Test end time: Wed Dec 6 08:45:16 UTC 2023

I can't find commit 46c4c9d1beb7 in our 4.4 kernel tree.

[Po-Hsu Lin (cypressyew)]

This can be found failing on T-3.13.0-197.248