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Date: Mon, 26 Oct 2015 22:35:39 +0900
From: Namhyung Kim <namhyung@...nel.org>
To: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Shuah Khan <shuahkh@....samsung.com>, linux-api@...r.kernel.org,
Heiko Carstens <heiko.carstens@...ibm.com>,
linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
Ingo Molnar <mingo@...hat.com>
Subject: Re: [BUGFIX PATCH] kselftest/ftrace: Fix the testcases for kprobes
on do_fork
Hi Masami,
On Fri, Oct 23, 2015 at 04:50:36PM +0900, Masami Hiramatsu wrote:
> Fix the testcase for kprobes which fails (false positive)
> because do_fork is renamed to _do_fork which is introduced
> by commit 3033f14ab78c32687 ("clone: support passing tls
> argument via C rather than pt_regs magic")
>
> This looks into /proc/kallsyms and checks whether do_fork
> or _do_fork exists.
>
> Without this fix (failure logs are removed):
> ----
> # ./ftracetest
> === Ftrace unit tests ===
> [1] Basic trace file check [PASS]
> [2] Basic test for tracers [PASS]
> [3] Basic trace clock test [PASS]
> [4] Basic event tracing check [PASS]
> [5] event tracing - enable/disable with event level files [PASS]
> [6] event tracing - enable/disable with subsystem level files [PASS]
> [7] event tracing - enable/disable with top level files [PASS]
> [8] ftrace - function graph filters with stack tracer [PASS]
> [9] ftrace - function graph filters [PASS]
> [10] ftrace - function profiler with function tracing [PASS]
> [11] Kprobe dynamic event - adding and removing [FAIL]
> [12] Kprobe dynamic event - busy event check [FAIL]
> [13] Kprobe dynamic event with arguments [FAIL]
> [14] Kprobe dynamic event with function tracer [FAIL]
> [15] Kretprobe dynamic event with arguments [FAIL]
>
> # of passed: 10
> # of failed: 5
> # of unresolved: 0
> # of untested: 0
> # of unsupported: 0
> # of xfailed: 0
> # of undefined(test bug): 0
> ----
>
> With this fix:
> ----
> # ftracetest
> === Ftrace unit tests ===
> [1] Basic trace file check [PASS]
> [2] Basic test for tracers [PASS]
> kselftest/ftrace: Fix the testcases for kprobes on do_fork
> [3] Basic trace clock test [PASS]
> [4] Basic event tracing check [PASS]
> [5] event tracing - enable/disable with event level files [PASS]
> [6] event tracing - enable/disable with subsystem level files [PASS]
> [7] event tracing - enable/disable with top level files [PASS]
> [8] ftrace - function graph filters with stack tracer [PASS]
> [9] ftrace - function graph filters [PASS]
> [10] ftrace - function profiler with function tracing [PASS]
> [11] Kprobe dynamic event - adding and removing [PASS]
> [12] Kprobe dynamic event - busy event check [PASS]
> [13] Kprobe dynamic event with arguments [PASS]
> [14] Kprobe dynamic event with function tracer [PASS]
> [15] Kretprobe dynamic event with arguments [PASS]
>
> # of passed: 15
> # of failed: 0
> # of unresolved: 0
> # of untested: 0
> # of unsupported: 0
> # of xfailed: 0
> # of undefined(test bug): 0
> ----
>
> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Shuah Khan <shuahkh@....samsung.com>
> Cc: Heiko Carstens <heiko.carstens@...ibm.com>
> Cc: linux-api@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
Acked-by: Namhyung Kim <namhyung@...nel.org>
Thanks
Namhyung
> ---
> .../ftrace/test.d/kprobe/add_and_remove.tc | 3 ++-
> .../selftests/ftrace/test.d/kprobe/busy_check.tc | 3 ++-
> .../selftests/ftrace/test.d/kprobe/kprobe_args.tc | 3 ++-
> .../ftrace/test.d/kprobe/kprobe_ftrace.tc | 15 ++++++++-------
> .../ftrace/test.d/kprobe/kretprobe_args.tc | 3 ++-
> 5 files changed, 16 insertions(+), 11 deletions(-)
>
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/add_and_remove.tc b/tools/testing/selftests/ftrace/test.d/kprobe/add_and_remove.tc
> index a5a4262..345e2ad 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/add_and_remove.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/add_and_remove.tc
> @@ -2,10 +2,11 @@
> # description: Kprobe dynamic event - adding and removing
>
> [ -f kprobe_events ] || exit_unsupported # this is configurable
> +FORK=`grep do_fork$ /proc/kallsyms | cut -f 3 -d" "`
>
> echo 0 > events/enable
> echo > kprobe_events
> -echo p:myevent do_fork > kprobe_events
> +echo p:myevent $FORK > kprobe_events
> grep myevent kprobe_events
> test -d events/kprobes/myevent
> echo > kprobe_events
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/busy_check.tc b/tools/testing/selftests/ftrace/test.d/kprobe/busy_check.tc
> index d8c7bb6..fe80134 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/busy_check.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/busy_check.tc
> @@ -2,10 +2,11 @@
> # description: Kprobe dynamic event - busy event check
>
> [ -f kprobe_events ] || exit_unsupported
> +FORK=`grep do_fork$ /proc/kallsyms | cut -f 3 -d" "`
>
> echo 0 > events/enable
> echo > kprobe_events
> -echo p:myevent do_fork > kprobe_events
> +echo p:myevent $FORK > kprobe_events
> test -d events/kprobes/myevent
> echo 1 > events/kprobes/myevent/enable
> echo > kprobe_events && exit 1 # this must fail
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args.tc
> index c45ee27..938b061 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args.tc
> @@ -2,10 +2,11 @@
> # description: Kprobe dynamic event with arguments
>
> [ -f kprobe_events ] || exit_unsupported # this is configurable
> +FORK=`grep do_fork$ /proc/kallsyms | cut -f 3 -d" "`
>
> echo 0 > events/enable
> echo > kprobe_events
> -echo 'p:testprobe do_fork $stack $stack0 +0($stack)' > kprobe_events
> +echo 'p:testprobe '$FORK' $stack $stack0 +0($stack)' > kprobe_events
> grep testprobe kprobe_events
> test -d events/kprobes/testprobe
> echo 1 > events/kprobes/testprobe/enable
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_ftrace.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_ftrace.tc
> index ab41d2b..51067c9 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_ftrace.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_ftrace.tc
> @@ -3,34 +3,35 @@
>
> [ -f kprobe_events ] || exit_unsupported # this is configurable
> grep function available_tracers || exit_unsupported # this is configurable
> +FORK=`grep do_fork$ /proc/kallsyms | cut -f 3 -d" "`
>
> # prepare
> echo nop > current_tracer
> -echo do_fork > set_ftrace_filter
> +echo $FORK > set_ftrace_filter
> echo 0 > events/enable
> echo > kprobe_events
> -echo 'p:testprobe do_fork' > kprobe_events
> +echo 'p:testprobe '"$FORK" > kprobe_events
>
> # kprobe on / ftrace off
> echo 1 > events/kprobes/testprobe/enable
> echo > trace
> ( echo "forked")
> grep testprobe trace
> -! grep 'do_fork <-' trace
> +! grep "$FORK"' <-' trace
>
> # kprobe on / ftrace on
> echo function > current_tracer
> echo > trace
> ( echo "forked")
> grep testprobe trace
> -grep 'do_fork <-' trace
> +grep "$FORK"' <-' trace
>
> # kprobe off / ftrace on
> echo 0 > events/kprobes/testprobe/enable
> echo > trace
> ( echo "forked")
> ! grep testprobe trace
> -grep 'do_fork <-' trace
> +grep "$FORK"' <-' trace
>
> # kprobe on / ftrace on
> echo 1 > events/kprobes/testprobe/enable
> @@ -38,14 +39,14 @@ echo function > current_tracer
> echo > trace
> ( echo "forked")
> grep testprobe trace
> -grep 'do_fork <-' trace
> +grep "$FORK"' <-' trace
>
> # kprobe on / ftrace off
> echo nop > current_tracer
> echo > trace
> ( echo "forked")
> grep testprobe trace
> -! grep 'do_fork <-' trace
> +! grep "$FORK"' <-' trace
>
> # cleanup
> echo nop > current_tracer
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kretprobe_args.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kretprobe_args.tc
> index 3171798..683d290 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/kretprobe_args.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kretprobe_args.tc
> @@ -2,10 +2,11 @@
> # description: Kretprobe dynamic event with arguments
>
> [ -f kprobe_events ] || exit_unsupported # this is configurable
> +FORK=`grep do_fork$ /proc/kallsyms | cut -f 3 -d" "`
>
> echo 0 > events/enable
> echo > kprobe_events
> -echo 'r:testprobe2 do_fork $retval' > kprobe_events
> +echo 'r:testprobe2 '$FORK' $retval' > kprobe_events
> grep testprobe2 kprobe_events
> test -d events/kprobes/testprobe2
> echo 1 > events/kprobes/testprobe2/enable
>
--
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