Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
selftests/ftrace: Add a testcase for fprobe events on module
Add a testcase for fprobe events on module, which unloads a kernel
module on which fprobe events are probing and ensure the ftrace
hash map is cleared correctly.
Link: https://lore.kernel.org/all/177669369564.132053.623527664540176496.stgit@mhiramat.tok.corp.google.com/
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
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tools/testing/selftests/ftrace/test.d/dynevent/add_remove_fprobe_module.tc
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tools/testing/selftests/ftrace/test.d/dynevent/add_remove_fprobe_module.tc
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#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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# description: Generic dynamic event - add/remove fprobe events on module
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# requires: dynamic_events "f[:[<group>/][<event>]] <func-name>[%return] [<args>]":README enabled_functions
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rmmod trace-events-sample ||:
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if ! modprobe trace-events-sample ; then
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echo "No trace-events sample module - please make CONFIG_SAMPLE_TRACE_EVENTS=m"
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exit_unresolved;
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fi
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trap "lsmod | grep -q trace_events_sample && rmmod trace-events-sample" EXIT
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echo 0 > events/enable
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echo > dynamic_events
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FUNC1='foo_bar*'
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FUNC2='vfs_read'
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:;: "Add an event on the test module" ;:
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echo "f:test1 $FUNC1" >> dynamic_events
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echo 1 > events/fprobes/test1/enable
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:;: "Ensure it is enabled" ;:
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funcs=`cat enabled_functions | wc -l`
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test $funcs -ne 0
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:;: "Check the enabled_functions is cleared on unloading" ;:
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rmmod trace-events-sample
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funcs=`cat enabled_functions | wc -l`
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test $funcs -eq 0
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:;: "Check it is kept clean" ;:
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modprobe trace-events-sample
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echo 1 > events/fprobes/test1/enable || echo "OK"
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funcs=`cat enabled_functions | wc -l`
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test $funcs -eq 0
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:;: "Add another event not on the test module" ;:
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echo "f:test2 $FUNC2" >> dynamic_events
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echo 1 > events/fprobes/test2/enable
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:;: "Ensure it is enabled" ;:
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ofuncs=`cat enabled_functions | wc -l`
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test $ofuncs -ne 0
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:;: "Disable and remove the first event"
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echo 0 > events/fprobes/test1/enable
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echo "-:fprobes/test1" >> dynamic_events
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funcs=`cat enabled_functions | wc -l`
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test $ofuncs -eq $funcs
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:;: "Disable and remove other events" ;:
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echo 0 > events/fprobes/enable
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echo > dynamic_events
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funcs=`cat enabled_functions | wc -l`
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test $funcs -eq 0
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rmmod trace-events-sample
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:;: "Add events on kernel and test module" ;:
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modprobe trace-events-sample
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echo "f:test1 $FUNC1" >> dynamic_events
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echo 1 > events/fprobes/test1/enable
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echo "f:test2 $FUNC2" >> dynamic_events
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echo 1 > events/fprobes/test2/enable
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ofuncs=`cat enabled_functions | wc -l`
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test $ofuncs -ne 0
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:;: "Unload module (ftrace entry should be removed)" ;:
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rmmod trace-events-sample
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funcs=`cat enabled_functions | wc -l`
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test $funcs -ne 0
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test $ofuncs -ne $funcs
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:;: "Disable and remove core-kernel fprobe event" ;:
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echo 0 > events/fprobes/test2/enable
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echo "-:fprobes/test2" >> dynamic_events
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:;: "Ensure ftrace is disabled." ;:
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funcs=`cat enabled_functions | wc -l`
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test $funcs -eq 0
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echo 0 > events/fprobes/enable
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echo > dynamic_events
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trap "" EXIT
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clear_trace