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selftests/ftrace: Save kprobe_events to test log

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It may lead to kernel panic when execute the following testcase on mips:

  # cd tools/testing/selftests/ftrace
  # ./ftracetest test.d/kprobe/multiple_kprobes.tc

A preliminary analysis shows that the issue is related with

  echo 1 > events/kprobes/enable

after add the 256 probe points.

In order to find the root cause, I want to verify which probe point has
problem, so it is necessary to save kprobe_events to test log.

With this patch, we can get the 256 probe points in the test log through
the following command:

  # ./ftracetest test.d/kprobe/multiple_kprobes.tc -vvv -k

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
Tiezhu Yang 2022-05-06 19:02:02 +08:00 committed by Thomas Bogendoerfer
parent a4fa106ee1
commit eab691b1a6
1 changed files with 2 additions and 0 deletions
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2
tools/testing/selftests/ftrace/test.d/kprobe/multiple_kprobes.tc
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@ -25,6 +25,8 @@ if [ $L -ne 256 ]; then
exit_fail
fi
cat kprobe_events >> $testlog
echo 1 > events/kprobes/enable
echo 0 > events/kprobes/enable
echo > kprobe_events