Hi Naresh,

On Wed, 15 Mar 2023 14:41:51 +0530 Naresh Kamboju naresh.kamboju@linaro.org wrote:

Hi Masami San,

On Wed, 15 Mar 2023 at 14:03, Masami Hiramatsu mhiramat@kernel.org wrote:

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Hi Naresh,

On Tue, 14 Mar 2023 15:52:44 +0530 Naresh Kamboju naresh.kamboju@linaro.org wrote:

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Results from Linaro’s test farm.

selftests ftrace failed on qemu-x86_64 and qemu-arm64. Please find the test log below.

Thanks for reporting! Can you share the kernel config which you used for this build? And the kernel is "next-20230314", is that correct?

I have attached a test log file and Kconfig file.

Thanks! I could reproduced.

The error log is here. ---- + . /mnt/ftrace/test.d/filter/event-filter-function.tc + echo 'Test event filter function name' Test event filter function name + echo 0 + echo 0 + echo + echo 'call_site.function == exit_mmap' + echo 1 + echo 1 + ls + echo 0 + + wcgrep -l exit_mmap + grep kmem_cache_free trace + hitcnt=0 + + wcgrep -l -v+ exit_mmap grep kmem_cache_free trace + misscnt=0 + '[' 0 -eq 0 ] + exit_fail + exit 1

And the test case is here. ----- echo 'call_site.function == exit_mmap' > events/kmem/kmem_cache_free/filter echo 1 > events/kmem/kmem_cache_free/enable echo 1 > tracing_on ls > /dev/null echo 0 > events/kmem/kmem_cache_free/enable

hitcnt=`grep kmem_cache_free trace| grep exit_mmap | wc -l` misscnt=`grep kmem_cache_free trace| grep -v exit_mmap | wc -l`

if [ $hitcnt -eq 0 ]; then exit_fail fi -----

The test case expects the `ls > /dev/null` involves 'kmem_cache_free' trace event, but it doesn't.

BTW, this code is a bit fragile because the function caller can be changed frequently. I think it should sample the events and use one of them. Let me fix that.

Thank you,

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Is this expected to fail ? Am I missing anything ?

No, it should be a bug. I would like to reproduce it.

• Naresh