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-rwxr-xr-xtests/qemu-iotests/10310
-rw-r--r--tests/qemu-iotests/103.out5
2 files changed, 15 insertions, 0 deletions
diff --git a/tests/qemu-iotests/103 b/tests/qemu-iotests/103
index ccab551..fa9a3c1 100755
--- a/tests/qemu-iotests/103
+++ b/tests/qemu-iotests/103
@@ -93,6 +93,16 @@ $QEMU_IO -c "open -o l2-cache-size=1M,refcount-cache-size=0.25M $TEST_IMG" \
-c 'read -P 42 0 64k' \
| _filter_qemu_io
+echo
+echo '=== Testing minimal L2 cache and COW ==='
+echo
+
+$QEMU_IMG snapshot -c foo "$TEST_IMG"
+# This requires a COW operation, which accesses two L2 tables simultaneously
+# (COW source and destination), so there must be enough space in the cache to
+# place both tables there (and qemu should not crash)
+$QEMU_IO -c "open -o cache-size=0 $TEST_IMG" -c 'write 0 64k' | _filter_qemu_io
+
# success, all done
echo '*** done'
rm -f $seq.full
diff --git a/tests/qemu-iotests/103.out b/tests/qemu-iotests/103.out
index ee705b0..d05f49f 100644
--- a/tests/qemu-iotests/103.out
+++ b/tests/qemu-iotests/103.out
@@ -26,4 +26,9 @@ read 65536/65536 bytes at offset 0
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 65536/65536 bytes at offset 0
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+=== Testing minimal L2 cache and COW ===
+
+wrote 65536/65536 bytes at offset 0
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
*** done
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