Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#!/bin/bash
2# SPDX-License-Identifier: GPL-2.0-or-later
3
4TIMEOUT=30
5
6DEBUFS_DIR=`cat /proc/mounts | grep debugfs | awk '{print $2}'`
7if [ ! -e "$DEBUFS_DIR" ]
8then
9 echo "debugfs not found, skipping" 1>&2
10 exit 4
11fi
12
13if [ ! -e "$DEBUFS_DIR/tracing/current_tracer" ]
14then
15 echo "Tracing files not found, skipping" 1>&2
16 exit 4
17fi
18
19
20echo "Testing for spurious faults when mapping kernel memory..."
21
22if grep -q "FUNCTION TRACING IS CORRUPTED" "$DEBUFS_DIR/tracing/trace"
23then
24 echo "FAILED: Ftrace already dead. Probably due to a spurious fault" 1>&2
25 exit 1
26fi
27
28dmesg -C
29START_TIME=`date +%s`
30END_TIME=`expr $START_TIME + $TIMEOUT`
31while [ `date +%s` -lt $END_TIME ]
32do
33 echo function > $DEBUFS_DIR/tracing/current_tracer
34 echo nop > $DEBUFS_DIR/tracing/current_tracer
35 if dmesg | grep -q 'ftrace bug'
36 then
37 break
38 fi
39done
40
41echo nop > $DEBUFS_DIR/tracing/current_tracer
42if dmesg | grep -q 'ftrace bug'
43then
44 echo "FAILED: Mapping kernel memory causes spurious faults" 1>&2
45 exit 1
46else
47 echo "OK: Mapping kernel memory does not cause spurious faults"
48 exit 0
49fi