btrfs-progs: tests: add 013-subvolume-sync-crash

Test for "btrfs-progs: subvol sync: fix memory corruption, undersized
array", a lot of deleted subvolumes in the 'subvol sync' will not fit
into the array, should result in a glibc report.

Signed-off-by: David Sterba <dsterba@suse.com>

tests/misc-tests/013-subvolume-sync-crash/test.sh

@@ -0,0 +1,49 @@
+#!/bin/bash
+#
+# Verify that subovolume sync waits until the subvolume is cleaned and does not
+# crash at the end
+
+source $TOP/tests/common
+
+check_prereq mkfs.btrfs
+check_prereq btrfs
+
+setup_root_helper
+
+run_check truncate -s 2G $IMAGE
+run_check $TOP/mkfs.btrfs -f $IMAGE
+run_check $SUDO_HELPER mount $IMAGE $TEST_MNT
+run_check $SUDO_HELPER chmod a+rw $TEST_MNT
+
+cd $TEST_MNT
+
+for i in `seq 5`; do
+	run_check dd if=/dev/zero of=file$i bs=1M count=10
+done
+
+# 128 is minimum
+for sn in `seq 130`;do
+	run_check $SUDO_HELPER $TOP/btrfs subvolume snapshot . snap$sn
+	for i in `seq 10`; do
+		run_check dd if=/dev/zero of=snap$sn/file$i bs=1M count=1
+	done
+done
+
+run_check $SUDO_HELPER $TOP/btrfs subvolume list .
+run_check $SUDO_HELPER $TOP/btrfs subvolume list -d .
+
+idtodel=`run_check_stdout $SUDO_HELPER $TOP/btrfs inspect-internal rootid snap3`
+
+# delete, sync after some time
+run_check $SUDO_HELPER $TOP/btrfs subvolume delete -c snap*
+{ sleep 5; run_check $TOP/btrfs filesystem sync $TEST_MNT; } &
+
+run_check $SUDO_HELPER $TOP/btrfs subvolume sync .
+
+run_check $TOP/btrfs filesystem sync $TEST_MNT
+run_check $SUDO_HELPER $TOP/btrfs subvolume list -d .
+
+wait
+cd ..
+
+run_check $SUDO_HELPER umount $TEST_MNT