powerpc/security: mitigation-patching.sh in ubuntu_kernel_selftests failed on K-5.19 P9

[Po-Hsu Lin]

This is not a regression in this cycle, this issue can be found since 5.19.0-37.38, at that point we have the workaround for bug 2000778 added to the test.

This test is failing simply because the kernel has already been tainted before the test:

Running 'make run_tests -C powerpc/security TEST_PROGS=mitigation-patching.sh TEST_GEN_PROGS='' TEST_CUSTOM_PROGS='''
 make: Entering directory '/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/powerpc/security'
 TAP version 13
 1..1
 # selftests: powerpc/security: mitigation-patching.sh
 # Error: kernel already tainted!
 not ok 1 selftests: powerpc/security: mitigation-patching.sh # exit=1
 make: Leaving directory '/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/powerpc/security'

Next is to identify which test is causing the taint.

[Po-Hsu Lin (cypressyew)]

The taint is with code 16384, soft lockup occurred, caused by net:udpgro_frglist.sh test (bug 2015843)

[Po-Hsu Lin (cypressyew)]

One quick solution to this is the re-order the test sequence, testing this on maas@obruchev.

[Po-Hsu Lin (cypressyew)]

https://git.launchpad.net/~canonical-kernel-team/+git/autotest-client-tests/commit/?id=2a6944ac1a20fc76d665aafc1be2ebd3a656788b