2 # SPDX-License-Identifier: GPL-2.0
3 # Copyright (C) 2019 SUSE Linux Products GmbH. All Rights Reserved.
7 # Stress send running in parallel with balance and deduplication against files
8 # that belong to the snapshots used by send. The goal is to verify that these
9 # operations running in parallel do not lead to send crashing (trigger assertion
10 # failures and BUG_ONs), or send finding an inconsistent snapshot that leads to
11 # a failure (reported in dmesg/syslog). The test needs big trees (snapshots)
12 # with large differences between the parent and send snapshots in order to hit
13 # such issues with a good probability.
16 _begin_fstest auto send dedupe clone balance
18 # Import common functions.
23 # real QA test starts here
25 _require_scratch_dedupe
28 # We at least need 8GB of free space on $SCRATCH_DEV
29 _require_scratch_size $((8 * 1024 * 1024))
31 _scratch_mkfs >>$seqres.full 2>&1
36 trap "wait; exit" SIGTERM
38 local f1=$(find $SCRATCH_MNT/snap1 -type f | shuf -n 1)
39 local f2=$(find $SCRATCH_MNT/snap2 -type f | shuf -n 1)
41 if (( RANDOM % 2 )); then
47 # Ignore errors from dedupe. We just want to test for crashes and
49 $XFS_IO_PROG -r -c "dedupe $f1 0 0 64K" $f2 &> /dev/null
56 # Avoid executing 'wait' inside the trap, because when we receive
57 # SIGTERM we might be already executing the wait command in the while
58 # loop below. When that is the case, bash 5.0+ with debug enabled prints
59 # a warning message that makes the test fail due to a mismatch with the
60 # golden output. That warning message is the following:
62 # warning: wait_for: recursively setting old_sigint_handler to wait_sigint_handler: running_trap = 16
66 while [ $stop -eq 0 ]; do
67 for ((i = 1; i <= 5; i++)); do
76 trap "wait; exit" SIGTERM
79 # Balance only metadata block groups, since this is makes it
80 # easier to hit problems (crashes and errors) in send.
81 # Ignore errors from balance. We just want to test for crashes
83 _run_btrfs_balance_start -f -m $SCRATCH_MNT &> /dev/null
90 trap "wait; exit" SIGTERM
94 for ((i = 1; i <= $count; i++)); do
95 # Ignore errors from send. We will check for errors later in
97 $BTRFS_UTIL_PROG send -f /dev/null \
98 $SCRATCH_MNT/snap1 &> /dev/null
105 trap "wait; exit" SIGTERM
109 for ((i = 1; i <= $count; i++)); do
110 # Ignore errors from send. We will check for errors later in
112 $BTRFS_UTIL_PROG send -f /dev/null \
113 -p $SCRATCH_MNT/snap1 $SCRATCH_MNT/snap2 &> /dev/null
114 sleep $((RANDOM % 3))
123 for ((i = 1; i <= $count; i++)); do
124 $XFS_IO_PROG -f -c "pwrite -S 0xea 0 64K" \
125 $SCRATCH_MNT/file_$((i + offset)) >/dev/null
134 for ((i = 1; i <= $count; i++)); do
135 $SETFATTR_PROG -n 'user.x1' -v $xattr_value \
136 $SCRATCH_MNT/file_$((i + offset))
140 # Number of files created before first snapshot. Must be divisable by 4.
141 nr_initial_files=40000
142 # Number of files created after the first snapshot. Must be divisable by 4.
145 # Create initial files.
146 step=$((nr_initial_files / 4))
147 for ((n = 0; n < 4; n++)); do
148 offset=$((step * $n))
149 write_files_loop $step $offset &
152 wait ${create_pids[@]}
154 $BTRFS_UTIL_PROG subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/snap1 \
157 # Add some more files, so that that are substantial differences between the
158 # two test snapshots used for an incremental send later.
161 step=$((nr_more_files / 4))
162 for ((n = 0; n < 4; n++)); do
163 offset=$((nr_initial_files + step * $n))
164 write_files_loop $step $offset &
167 wait ${create_pids[@]}
169 # Add some xattrs to all files, so that every leaf and node of the fs tree is
170 # COWed. Adding more files does only adds leafs and nodes to the tree's right
171 # side, since inode numbers are based on a counter and form the first part
172 # (objectid) of btree keys (we only modifying the right most leaf of the tree).
173 # Use large values for the xattrs to quickly increase the height of the tree.
174 xattr_value=$(printf '%0.sX' $(seq 1 3800))
176 # Split the work into 4 workers working on consecutive ranges to avoid contention
177 # on the same leafs as much as possible.
178 step=$(((nr_more_files + nr_initial_files) / 4))
179 for ((n = 0; n < 4; n++)); do
180 offset=$((step * $n))
181 set_xattrs_loop $step $offset &
184 wait ${setxattr_pids[@]}
186 $BTRFS_UTIL_PROG subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/snap2 \
210 # Check for errors messages that happen due to inconsistent snapshot caused by
211 # deduplication and balance running in parallel with send, causing btree nodes
212 # and leafs to disappear and getting reused while send is using them.
216 # BTRFS error (device sdc): did not find backref in send_root. inode=63292, \
217 # offset=0, disk_byte=5228134400 found extent=5228134400
219 # BTRFS error (device sdc): parent transid verify failed on 32243712 wanted 24 \
222 _dmesg_since_test_start | egrep -e '\bBTRFS error \(device .*?\):'