linux-kernel - [PATCH v2 1/2] selftests/ftrace: Save kprobe

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Message-Id: <1651832423-7932-2-git-send-email-yangtiezhu@loongson.cn>
Date:   Fri,  6 May 2022 18:20:22 +0800
From:   Tiezhu Yang <yangtiezhu@...ngson.cn>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Shuah Khan <shuah@...nel.org>
Cc:     Xuefeng Li <lixuefeng@...ngson.cn>, linux-mips@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] selftests/ftrace: Save kprobe_events to test log

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@...ngson.cn>
Acked-by: Masami Hiramatsu <mhiramat@...nel.org>
---
 tools/testing/selftests/ftrace/test.d/kprobe/multiple_kprobes.tc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/multiple_kprobes.tc b/tools/testing/selftests/ftrace/test.d/kprobe/multiple_kprobes.tc
index 312d237..be754f5 100644
--- a/tools/testing/selftests/ftrace/test.d/kprobe/multiple_kprobes.tc
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/multiple_kprobes.tc
@@ -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
-- 
2.1.0