[PATCH v7 16/20] tracing/remotes: selftests: Add a test for the dump_on_panic tracefs file
From: Vincent Donnefort <hidden>
Date: 2026-09-24 14:58:43
Also in:
lkml
Subsystem:
kernel selftest framework, the rest, tracing · Maintainers:
Shuah Khan, Shuah Khan, Linus Torvalds, Steven Rostedt, Masami Hiramatsu
Exercise the newly introduced dump_on_panic tracefs file that turns on or off the trace remote buffer dump on system panic. Signed-off-by: Vincent Donnefort <redacted> --- .../remotes/00hypervisor/dump_on_panic.tc | 11 ++++ .../ftrace/test.d/remotes/dump_on_panic.tc | 50 +++++++++++++++++++ .../selftests/ftrace/test.d/remotes/functions | 1 + 3 files changed, 62 insertions(+) create mode 100644 tools/testing/selftests/ftrace/test.d/remotes/00hypervisor/dump_on_panic.tc create mode 100644 tools/testing/selftests/ftrace/test.d/remotes/dump_on_panic.tc
diff --git a/tools/testing/selftests/ftrace/test.d/remotes/00hypervisor/dump_on_panic.tc b/tools/testing/selftests/ftrace/test.d/remotes/00hypervisor/dump_on_panic.tc
new file mode 100644
index 000000000000..1b6bf21c5d9c
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/remotes/00hypervisor/dump_on_panic.tc@@ -0,0 +1,11 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# description: Test hypervisor trace dump_on_panic +# requires: remotes/hypervisor/write_event remotes/hypervisor/dump_on_panic + +SOURCE_REMOTE_TEST=1 +. $TEST_DIR/remotes/dump_on_panic.tc + +set -e +setup_remote "hypervisor" +test_dump_on_panic
diff --git a/tools/testing/selftests/ftrace/test.d/remotes/dump_on_panic.tc b/tools/testing/selftests/ftrace/test.d/remotes/dump_on_panic.tc
new file mode 100644
index 000000000000..ff5ca29fb1b5
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/remotes/dump_on_panic.tc@@ -0,0 +1,50 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# description: Test trace remote dump_on_panic +# requires: remotes/test remotes/test/dump_on_panic + +. $TEST_DIR/remotes/functions + +test_dump_on_panic() +{ + # + # Toggle when the buffer is loaded + # + assert_loaded + echo 1 > dump_on_panic + echo 0 > dump_on_panic + + # + # Toggle when the buffer is unloaded + # + echo 0 > tracing_on + assert_unloaded + echo 1 > dump_on_panic + echo 0 > dump_on_panic + + # + # Load and unload buffer while dump_on_panic is enabled + # + echo 0 > tracing_on + assert_unloaded + + echo 1 > dump_on_panic + echo 1 > tracing_on + echo 0 > tracing_on + + [ -z "$TRIGGER_PANIC" ] && return + + echo 1 > tracing_on + + for i in $(seq 1 32); do + echo $i > write_event + done + + echo c > /proc/sysrq-trigger +} + +if [ -z "$SOURCE_REMOTE_TEST" ]; then + set -e + setup_remote_test + test_dump_on_panic +fi
diff --git a/tools/testing/selftests/ftrace/test.d/remotes/functions b/tools/testing/selftests/ftrace/test.d/remotes/functions
index c368dea2ac4e..f0225af23714 100644
--- a/tools/testing/selftests/ftrace/test.d/remotes/functions
+++ b/tools/testing/selftests/ftrace/test.d/remotes/functions@@ -9,6 +9,7 @@ setup_remote() cd remotes/$name/ echo 0 > tracing_on [ -f dmesg ] && echo 0 > dmesg + [ -f dump_on_panic ] && echo 0 > dump_on_panic clear_trace echo 7 > buffer_size_kb echo 0 > events/enable
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2.56.0.rc1.310.g51773c2048-goog