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eab691b1a6
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>
36 lines
881 B
Bash
36 lines
881 B
Bash
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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# description: Register/unregister many kprobe events
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# requires: kprobe_events
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# ftrace fentry skip size depends on the machine architecture.
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# Currently HAVE_KPROBES_ON_FTRACE defined on x86 and powerpc64le
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case `uname -m` in
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x86_64|i[3456]86) OFFS=5;;
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ppc64le) OFFS=8;;
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*) OFFS=0;;
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esac
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N=0
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echo "Setup up kprobes on first available 256 text symbols"
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grep -i " t " /proc/kallsyms | cut -f3 -d" " | grep -v .*\\..* | \
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while read i; do
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echo p ${i}+${OFFS} >> kprobe_events && N=$((N+1)) ||:
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test $N -eq 256 && break
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done
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L=`cat kprobe_events | wc -l`
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if [ $L -ne 256 ]; then
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echo "The number of kprobes events ($L) is not 256"
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exit_fail
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fi
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cat kprobe_events >> $testlog
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echo 1 > events/kprobes/enable
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echo 0 > events/kprobes/enable
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echo > kprobe_events
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echo "Waiting for unoptimizing & freeing"
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sleep 5
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echo "Done"
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