I am testing qcow2 with qemu-iotests on F17, using upstream QEMU source tree: $ uname -a Linux Test.Server 3.8.12-100.fc17.x86_64 #1 SMP Wed May 8 15:36:14 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux But got failed result as follows: $ ./check -qcow2 QEMU -- /usr/bin/qemu QEMU_IMG -- /usr/bin/qemu-img QEMU_IO -- /usr/bin/qemu-io IMGFMT -- qcow2 (compat=1.1) IMGPROTO -- file PLATFORM -- Linux/x86_64 11 3.8.12-100.fc17.x86_64 001 002 003 004 005 006 [not run] not suitable for this image format: qcow2 007 008 009 010 011 012 013 014 015 016 [not run] not suitable for this image format: qcow2 017 018 019 020 021 022 023 024 025 026 - output mismatch (see 026.out.bad) --- 026.out 2013-05-16 10:53:54.637625453 +0800 +++ 026.out.bad 2013-05-19 14:05:10.447854701 +0800 @@ -126,62 +126,64 @@ Event: l2_update; errno: 5; imm: off; once: on; write write failed: Input/output error -128 leaked clusters were found on the image. +127 leaked clusters were found on the image. This means waste of disk space, but no harm to data. Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 Event: l2_update; errno: 5; imm: off; once: on; write -b write failed: Input/output error -128 leaked clusters were found on the image. +127 leaked clusters were found on the image. This means waste of disk space, but no harm to data. Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 Event: l2_update; errno: 5; imm: off; once: off; write write failed: Input/output error -128 leaked clusters were found on the image. +127 leaked clusters were found on the image. This means waste of disk space, but no harm to data. Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 Event: l2_update; errno: 5; imm: off; once: off; write -b write failed: Input/output error -128 leaked clusters were found on the image. +127 leaked clusters were found on the image. This means waste of disk space, but no harm to data. Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 Event: l2_update; errno: 28; imm: off; once: on; write write failed: No space left on device -128 leaked clusters were found on the image. +127 leaked clusters were found on the image. This means waste of disk space, but no harm to data. Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 Event: l2_update; errno: 28; imm: off; once: on; write -b write failed: No space left on device -128 leaked clusters were found on the image. +127 leaked clusters were found on the image. This means waste of disk space, but no harm to data. Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 Event: l2_update; errno: 28; imm: off; once: off; write write failed: No space left on device -128 leaked clusters were found on the image. +127 leaked clusters were found on the image. This means waste of disk space, but no harm to data. Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 Event: l2_update; errno: 28; imm: off; once: off; write -b write failed: No space left on device -128 leaked clusters were found on the image. +127 leaked clusters were found on the image. This means waste of disk space, but no harm to data. Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 Event: l2_alloc.write; errno: 5; imm: off; once: on; write write failed: Input/output error -No errors were found on the image. + +1 leaked clusters were found on the image. +This means waste of disk space, but no harm to data. Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 Event: l2_alloc.write; errno: 5; imm: off; once: on; write -b @@ -205,7 +207,9 @@ Event: l2_alloc.write; errno: 28; imm: off; once: on; write write failed: No space left on device -No errors were found on the image. + +1 leaked clusters were found on the image. +This means waste of disk space, but no harm to data. Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 Event: l2_alloc.write; errno: 28; imm: off; once: on; write -b @@ -575,7 +579,6 @@ Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 Event: l1_grow.write_table; errno: 5; imm: off; once: off -qcow2_free_clusters failed: Input/output error write failed: Input/output error No errors were found on the image. Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 @@ -586,7 +589,6 @@ Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 Event: l1_grow.write_table; errno: 28; imm: off; once: off -qcow2_free_clusters failed: No space left on device write failed: No space left on device No errors were found on the image. Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 @@ -597,7 +599,6 @@ Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 Event: l1_grow.activate_table; errno: 5; imm: off; once: off -qcow2_free_clusters failed: Input/output error write failed: Input/output error 96 leaked clusters were found on the image. @@ -610,7 +611,6 @@ Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 Event: l1_grow.activate_table; errno: 28; imm: off; once: off -qcow2_free_clusters failed: No space left on device write failed: No space left on device 96 leaked clusters were found on the image. 027 028 029 030 031 032 033 034 035 036 037 038 - output mismatch (see 038.out.bad) --- 038.out 2013-05-16 10:53:54.639625449 +0800 +++ 038.out.bad 2013-05-19 14:05:55.892149537 +0800 @@ -519,6 +519,8 @@ == Some concurrent requests touching the same cluster == qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> qemu-io> wrote 65536/65536 bytes at offset XXX 64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +wrote 81920/81920 bytes at offset XXX +80 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) wrote 65536/65536 bytes at offset XXX 64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) wrote 65536/65536 bytes at offset XXX @@ -577,8 +579,6 @@ 64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) wrote 65536/65536 bytes at offset XXX 64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) -wrote 81920/81920 bytes at offset XXX -80 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) wrote 65536/65536 bytes at offset XXX 64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) wrote 65536/65536 bytes at offset XXX @@ -613,6 +613,8 @@ 64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) wrote 65536/65536 bytes at offset XXX 64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +wrote 81920/81920 bytes at offset XXX +80 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) wrote 65536/65536 bytes at offset XXX 64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) wrote 65536/65536 bytes at offset XXX @@ -645,8 +647,6 @@ 64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) wrote 65536/65536 bytes at offset XXX 64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) -wrote 81920/81920 bytes at offset XXX -80 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) wrote 65536/65536 bytes at offset XXX 64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) wrote 65536/65536 bytes at offset XXX 039 040 041 042 043 044 045 [not run] not suitable for this image format: qcow2 046 047 048 049 050 052 053 Not run: 006 016 045 Failures: 026 038 Failed 2 of 49 tests