On Mon, Mar 26, 2018 at 12:28:40PM +1000, ronnie sahlberg wrote:
> I have also built on linus current master and can not reprroduce there
> either. The oplocks are broken correctly.
You can run the reproducer miltiple times. It does not reproduce everytime.
>
> Xiong, since you can reproduce, can you try to git bisect and find
> which commit this failure started at ?
The oldest kernel I can reproduce this on is v4.2 Linus tree.
I got boot issue with v4.1.
Thanks,
XIong
>
snip..
----------------------------------------------------------
#! /bin/bash
err_exit() { echo -e $1; exit 1; }
setup_cifs()
{
local cifs_tst_export=/export/cifstest
local cifs_sch_export=/export/cifsscratch
mkdir -p $cifs_tst_export $cifs_sch_export
\cp -f /etc/samba/smb.conf{,.bak}
cat > /etc/samba/smb.conf << EOF
[test]
path = $cifs_tst_export
writeable = yes
[scratch]
path = $cifs_sch_export
writeable = yes
EOF
which systemctl && systemctl restart smb > /dev/null 2>&1
service stop smb > /dev/null 2>&1
restorecon /etc/samba/smb.conf
testparm -s
chcon -t samba_share_t $cifs_sch_export
chcon -t samba_share_t $cifs_tst_export
echo -e "redhat\nredhat" | smbpasswd -a root
service start smb > /dev/null 2>&1
}
preset_cifs()
{
local vers=${1:-3.0}
echo Testing $vers
TEST_DEV=//localhost/test
SCRATCH_DEV=//localhost/scratch
TEST_DIR=/cifsmnt
SCRATCH_MNT=/cifssch
umount $TEST_DEV $SCRATCH_DEV $TEST_DIR $SCRATCH_MNT > /dev/null 2>&1
mkdir -p $TEST_DIR $SCRATCH_MNT
MOUNT_OPTIONS="-o vers=${vers},username=root,password=redhat"
TEST_FS_MOUNT_OPTS="-o vers=${vers},username=root,password=redhat"
mount.cifs $TEST_DEV $TEST_DIR $MOUNT_OPTIONS || err_exit "cifs mount $TEST_DEV failed"
mount.cifs $SCRATCH_DEV $SCRATCH_MNT $MOUNT_OPTIONS || err_exit "cifs mount $SCRATCH_DEV failed"
}
cleanup_cifs()
{
killall open_wait open
echo cnt=$cnt
umount $TEST_DEV $SCRATCH_DEV $TEST_DIR $SCRATCH_MNT > /dev/null 2>&1
\cp -f /etc/samba/smb.conf{.bak,}
which systemctl && systemctl restart smb
service stop smb > /dev/null 2>&1
service start smb > /dev/null 2>&1
}
trap "cleanup_cifs; exit" 2
do_test()
{
touch $SCRATCH_MNT/testfile
mount | grep $SCRATCH_MNT
cnt=0
while true ; do
while killall open_wait open ; do sleep 1; done
./open_wait $SCRATCH_MNT/testfile &
./open $SCRATCH_MNT/testfile 2>&1 | tee log
grep -E "2\..* seconds" log && { echo reproduced; break; }
((cnt++))
[ $cnt -gt 100 ] && break
done
echo "cnt=$cnt"
}
start_debug()
{
dmesg -C
modprobe cifs
echo 7 > /proc/fs/cifs/cifsFYI
echo 'module cifs +p' > /sys/kernel/debug/dynamic_debug/control
echo 'file fs/cifs/* +p' > /sys/kernel/debug/dynamic_debug/control
tcpdump -i lo -s0 -w cifs-traffic.pcap host localhost and port 445 &
pid=$!
echo $pid
}
stop_debug()
{
echo 0 > /proc/fs/cifs/cifsFYI
echo 'module cifs -p' > /sys/kernel/debug/dynamic_debug/control
echo 'file fs/cifs/* -p' > /sys/kernel/debug/dynamic_debug/control
while kill -2 $pid ; do sleep 1; done
dmesg > dmesg
tcpdump -r cifs-traffic.pcap > pcap.log
sleep 1
}
rpm -qv cifs-utils || yum intsall -y cifs-utils
rpm -qv samba || yum intsall -y samba samba-client
uname -r
cleanup_cifs
setup_cifs
cc open_wait.c -o open_wait
cc open.c -o open
preset_cifs 2.0
do_test
cleanup_cifs
rm -f open_wait open a.out
exit
--
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