[LTP] [PATCH V2 2/9] tracing/ftrace: add new case for ftrace userstacktrace

Chunyu Hu
2016-04-18T08:04:09Z

From: Li Wang <liwang@redhat.com>

This case is the reproducer of ftrace userstacktrace bug.

BUG: unable to handle kernel paging request at 00000000417683c0
IP: [<ffffffff8105c834>] update_curr+0x124/0x1e0
PGD 41a796067 PUD 0
Thread overran stack, or stack corrupted
Oops: 0000 [#1] SMP
last sysfs file: /sys/devices/system/cpu/cpu15/cache/index2/shared_cpu_map

The bug was fixed by:
1dbd195 (tracing: Fix preempt count leak)

Signed-off-by: Li Wang <liwang@redhat.com>
---
runtest/tracing | 1 +
.../tracing/ftrace_test/ftrace_regression01.sh | 86 ++++++++++++++++++++++
2 files changed, 87 insertions(+)
create mode 100755 testcases/kernel/tracing/ftrace_test/ftrace_regression01.sh

diff --git a/runtest/tracing b/runtest/tracing
index ef3a048..fb82515 100644
--- a/runtest/tracing
+++ b/runtest/tracing
@@ -1,2 +1,3 @@
#DESCRIPTION:Tracing testing
+ftrace_regression01 ftrace_regression01.sh
ftrace-stress-test ftrace_stress_test.sh 90
diff --git a/testcases/kernel/tracing/ftrace_test/ftrace_regression01.sh b/testcases/kernel/tracing/ftrace_test/ftrace_regression01.sh
new file mode 100755
index 0000000..1453f5d
--- /dev/null
+++ b/testcases/kernel/tracing/ftrace_test/ftrace_regression01.sh
@@ -0,0 +1,86 @@
+#! /bin/sh
+
+###########################################################################
+## ##
+## Copyright (c) 2015, Red Hat Inc. ##
+## ##
+## This program is free software: you can redistribute it and/or modify ##
+## it under the terms of the GNU General Public License as published by ##
+## the Free Software Foundation, either version 3 of the License, or ##
+## (at your option) any later version. ##
+## ##
+## This program is distributed in the hope that it will be useful, ##
+## but WITHOUT ANY WARRANTY; without even the implied warranty of ##
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ##
+## GNU General Public License for more details. ##
+## ##
+## You should have received a copy of the GNU General Public License ##
+## along with this program. If not, see <http://www.gnu.org/licenses/>. ##
+## ##
+## Author: Li Wang <liwang@redhat.com> ##
+## ##
+###########################################################################
+## ##
+## Summary: panic while using userstacktrace ##
+## ##
+## BUG: unable to handle kernel paging request at 00000000417683c0 ##
+## IP: [<ffffffff8105c834>] update_curr+0x124/0x1e0 ##
+## PGD 41a796067 PUD 0 ##
+## Thread overran stack, or stack corrupted ##
+## Oops: 0000 [#1] SMP ##
+## last sysfs file: ../system/cpu/cpu15/cache/index2/shared_cpu_map ##
+## ##
+## The bug was fixed by: ##
+## 1dbd195 (tracing: Fix preempt count leak) ##
+## ##
+###########################################################################
+
+export TCID="ftrace_regression01"
+export TST_TOTAL=1
+
+. ftrace_lib.sh
+
+LOOP=10
+
+TSTACK_TRACE_PATH="/proc/sys/kernel/stack_tracer_enabled"
+EXC_PAGE_FAULT_ENABLE="$TRACING_PATH/events/exceptions/page_fault_kernel/enable"
+MM_PAGE_FAULT_ENABLE="$TRACING_PATH/events/kmem/mm_kernel_pagefault/enable"
+
+ftrace_userstacktrace_test()
+{
+ if [ ! -e "$TSTACK_TRACE_PATH" ]; then
+ tst_brkm TCONF ignored "Stack Tracer is not cofigured in This kernel"
+ fi
+
+ for i in $(seq $LOOP); do
+ echo 1 > $TSTACK_TRACE_PATH
+ echo userstacktrace > $TRACING_PATH/trace_options
+ grep -q "^userstacktrace" $TRACING_PATH/trace_options
+ if [ $? -ne 0 ]; then
+ tst_brkm TBROK "Failed to set userstacktrace"
+ fi
+
+ if [ -f "$EXC_PAGE_FAULT_ENABLE" ]; then
+ exc_page_fault_enable=`cat $EXC_PAGE_FAULT_ENABLE`
+ echo 1 > $EXC_PAGE_FAULT_ENABLE
+ else
+ mm_page_fault_enable=`cat MM_PAGE_FAULT_ENABLE`
+ echo 1 > $MM_PAGE_FAULT_ENABLE
+ fi
+ done
+
+ if [ -f "$EXC_PAGE_FAULT_ENABLE" ]; then
+ echo "$exc_page_fault_enable" > $EXC_PAGE_FAULT_ENABLE
+ else
+ echo "$mm_page_fault_enable" > $MM_PAGE_FAULT_ENABLE
+ fi
+
+ tst_resm TPASS "Finished running the test"
+}
+
+#--------Test Start--------------
+save_old_setting
+
+ftrace_userstacktrace_test
+
+clean_up
--
1.8.3.1