diff mbox series

[v2,1/2] selftests/ftrace: Add new test case which adds multiple consecutive probes in a function

Message ID 20230418095557.19061-2-akanksha@linux.ibm.com (mailing list archive)
State Superseded
Headers show
Series selftests/ftrace: Add tests for kprobes and optimized probes | expand

Commit Message

Akanksha J N April 18, 2023, 9:55 a.m. UTC
Commit 97f88a3d723162 ("powerpc/kprobes: Fix null pointer reference in
arch_prepare_kprobe()") fixed a recent kernel oops that was caused as
ftrace-based kprobe does not generate kprobe::ainsn::insn and it gets
set to NULL.
Add new test case kprobe_insn_boundary.tc which adds a
kprobe at every byte within $FUNCTION_FORK up to an offset of 256 bytes,
to be able to test potential issues with kprobes on
successive instructions.
The '|| continue' is added with the echo statement to ignore errors that
are caused by trying to add kprobes to non probeable lines and continue
with the test.
Signed-off-by: Akanksha J N <akanksha@linux.ibm.com>
---
 .../test.d/kprobe/kprobe_insn_boundary.tc     | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 tools/testing/selftests/ftrace/test.d/kprobe/kprobe_insn_boundary.tc

Comments

Masami Hiramatsu (Google) April 25, 2023, 12:12 a.m. UTC | #1
On Tue, 18 Apr 2023 15:25:56 +0530
Akanksha J N <akanksha@linux.ibm.com> wrote:

> Commit 97f88a3d723162 ("powerpc/kprobes: Fix null pointer reference in
> arch_prepare_kprobe()") fixed a recent kernel oops that was caused as
> ftrace-based kprobe does not generate kprobe::ainsn::insn and it gets
> set to NULL.
> Add new test case kprobe_insn_boundary.tc which adds a
> kprobe at every byte within $FUNCTION_FORK up to an offset of 256 bytes,
> to be able to test potential issues with kprobes on
> successive instructions.
> The '|| continue' is added with the echo statement to ignore errors that
> are caused by trying to add kprobes to non probeable lines and continue
> with the test.

Hi Akanksha,

Thanks for adding test case. This looks good to me.

Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>

> Signed-off-by: Akanksha J N <akanksha@linux.ibm.com>
> ---
>  .../test.d/kprobe/kprobe_insn_boundary.tc     | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
>  create mode 100644 tools/testing/selftests/ftrace/test.d/kprobe/kprobe_insn_boundary.tc
> 
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_insn_boundary.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_insn_boundary.tc
> new file mode 100644
> index 000000000000..4f7cc318f331
> --- /dev/null
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_insn_boundary.tc
> @@ -0,0 +1,19 @@
> +#!/bin/sh
> +# SPDX-License-Identifier: GPL-2.0-or-later
> +# Copyright (C) 2023 Akanksha J N, IBM corporation
> +# description: Register multiple kprobe events in a function
> +# requires: kprobe_events
> +
> +for i in `seq 0 255`; do
> +  echo p $FUNCTION_FORK+${i} >> kprobe_events || continue
> +done
> +
> +cat kprobe_events >> $testlog
> +
> +echo 1 > events/kprobes/enable
> +( echo "forked" )
> +echo 0 > events/kprobes/enable
> +echo > kprobe_events
> +echo "Waiting for unoptimizing & freeing"
> +sleep 5
> +echo "Done"
> -- 
> 2.31.1
>
diff mbox series

Patch

diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_insn_boundary.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_insn_boundary.tc
new file mode 100644
index 000000000000..4f7cc318f331
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_insn_boundary.tc
@@ -0,0 +1,19 @@ 
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0-or-later
+# Copyright (C) 2023 Akanksha J N, IBM corporation
+# description: Register multiple kprobe events in a function
+# requires: kprobe_events
+
+for i in `seq 0 255`; do
+  echo p $FUNCTION_FORK+${i} >> kprobe_events || continue
+done
+
+cat kprobe_events >> $testlog
+
+echo 1 > events/kprobes/enable
+( echo "forked" )
+echo 0 > events/kprobes/enable
+echo > kprobe_events
+echo "Waiting for unoptimizing & freeing"
+sleep 5
+echo "Done"