ptrace10 from ubuntu_ltp_syscalls failed on T/X/B

[Po-Hsu Lin]

Issue found on B-AWS 4.15.0-1087.92

This is a new test case added a week ago [1]. Test failed with:
 startup='Wed Oct 21 13:10:37 2020'
 tst_test.c:1250: TINFO: Timeout per run is 0h 05m 00s
 ptrace10.c:60: TFAIL: The rd0 wasn't set on second PTRACE_POKEUSER

 HINT: You _MAY_ be missing kernel fixes, see:

 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bd14406b78e6

 Summary:
 passed 0
 failed 1
 skipped 0
 warnings 0
 tag=ptrace10 stime=1603285837 dur=0 exit=exited stat=1 core=no cu=0 cs=0

[1] https://github.com/linux-test-project/ltp/blob/master/testcases/kernel/syscalls/ptrace/ptrace10.c

[Po-Hsu Lin (cypressyew)]

Can be found on X-4.15

[Po-Hsu Lin (cypressyew)]

Spotted on AWS 4.4.0-1118.132

[Kelsey Steele (kelsey-steele)]

found on bionic/fips 4.15.0-1053.61

[Kleber Sacilotto de Souza (kleber-souza)]

Failed on xenial/linux-oracle: 4.15.0-1069.77~16.04.1 for sru-20210315

[Kleber Sacilotto de Souza (kleber-souza)]

Found with trusty/linux-azure 4.15.0-1114.127~14.04.1.

[Guilherme G. Piccoli (gpiccoli)]

Observed in T-4.15/Azure, cycle sru-20210531 .

[Guilherme G. Piccoli (gpiccoli)]

Observed in B/aws (kernel 4.15), cycle sru-20210621.

[Guilherme G. Piccoli (gpiccoli)]

Observed in B/aws-fips (kernel 4.15), cycle sru-20210621.

[Krzysztof Kozlowski (krzk)]

Found on xenial/oracle 4.15.0-1077.85~16.04.1

[Krzysztof Kozlowski (krzk)]

Found on bionic/linux-azure-4.15/4.15.0-1123.136

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Krzysztof Kozlowski (krzk)]

Bionic 4.15: The kernel might be missing commit bd14406b78e6 ("perf/hw_breakpoint: Modify breakpoint even if the new attr has disabled set") but its backport relies on several other refactoring commits in that area. No plans for backporting it to Bionic and earlier.

[Po-Hsu Lin (cypressyew)]

Found on T-azure 4.15.0-1124.137~14.04.1