name : stress_code_patching.sh #!/bin/bash # SPDX-License-Identifier: GPL-2.0-or-later TIMEOUT=30 DEBUFS_DIR=`cat /proc/mounts | grep debugfs | awk '{print $2}'` if [ ! -e "$DEBUFS_DIR" ] then echo "debugfs not found, skipping" 1>&2 exit 4 fi if [ ! -e "$DEBUFS_DIR/tracing/current_tracer" ] then echo "Tracing files not found, skipping" 1>&2 exit 4 fi echo "Testing for spurious faults when mapping kernel memory..." if grep -q "FUNCTION TRACING IS CORRUPTED" "$DEBUFS_DIR/tracing/trace" then echo "FAILED: Ftrace already dead. Probably due to a spurious fault" 1>&2 exit 1 fi dmesg -C START_TIME=`date +%s` END_TIME=`expr $START_TIME + $TIMEOUT` while [ `date +%s` -lt $END_TIME ] do echo function > $DEBUFS_DIR/tracing/current_tracer echo nop > $DEBUFS_DIR/tracing/current_tracer if dmesg | grep -q 'ftrace bug' then break fi done echo nop > $DEBUFS_DIR/tracing/current_tracer if dmesg | grep -q 'ftrace bug' then echo "FAILED: Mapping kernel memory causes spurious faults" 1>&2 exit 1 else echo "OK: Mapping kernel memory does not cause spurious faults" exit 0 fi