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https://github.com/xemu-project/xemu.git
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qcow2: fix image corruption on commit with persistent bitmap
If an image contains persistent bitmaps, we cannot use the fast path of bdrv_make_empty() to clear the image during qemu-img commit, because that will lose the clusters related to the bitmaps. Also leave a comment in qcow2_read_extensions to remind future feature additions to think about fast-path removal, since we just barely fixed the same bug for LUKS encryption. It's a pain that qemu-img has not yet been taught to manipulate, or even at a very minimum display, information about persistent bitmaps; instead, we have to use QMP commands. It's also a pain that only qeury-block and x-debug-block-dirty-bitmap-sha256 will allow bitmap introspection; but the former requires the node to be hooked to a block device, and the latter is experimental. Signed-off-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Eric Blake
Kevin Wolf
parent
3590cd0f04
commit
4096974e18
@ -376,6 +376,8 @@ static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset,
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default:
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/* unknown magic - save it in case we need to rewrite the header */
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/* If you add a new feature, make sure to also update the fast
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* path of qcow2_make_empty() to deal with it. */
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{
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Qcow2UnknownHeaderExtension *uext;
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@ -3600,15 +3602,16 @@ static int qcow2_make_empty(BlockDriverState *bs)
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l1_clusters = DIV_ROUND_UP(s->l1_size, s->cluster_size / sizeof(uint64_t));
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if (s->qcow_version >= 3 && !s->snapshots &&
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if (s->qcow_version >= 3 && !s->snapshots && !s->nb_bitmaps &&
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3 + l1_clusters <= s->refcount_block_size &&
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s->crypt_method_header != QCOW_CRYPT_LUKS) {
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/* The following function only works for qcow2 v3 images (it requires
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* the dirty flag) and only as long as there are no snapshots (because
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* it completely empties the image). Furthermore, the L1 table and three
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* additional clusters (image header, refcount table, one refcount
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* block) have to fit inside one refcount block. It cannot be used
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* for LUKS (yet) as it throws away the LUKS header cluster(s) */
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/* The following function only works for qcow2 v3 images (it
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* requires the dirty flag) and only as long as there are no
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* features that reserve extra clusters (such as snapshots,
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* LUKS header, or persistent bitmaps), because it completely
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* empties the image. Furthermore, the L1 table and three
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* additional clusters (image header, refcount table, one
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* refcount block) have to fit inside one refcount block. */
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return make_completely_empty(bs);
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}
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@ -3,10 +3,11 @@
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# Commit changes into backing chains and empty the top image if the
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# backing image is not explicitly specified.
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#
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# Variant of 097, which includes snapshots to test different codepath
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# in qcow2
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# Variant of 097, which includes snapshots and persistent bitmaps, to
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# tickle the slow codepath in qcow2. See also 198, for another feature
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# that tickles the slow codepath.
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#
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# Copyright (C) 2014 Red Hat, Inc.
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# Copyright (C) 2014, 2017 Red Hat, Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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@ -43,11 +44,18 @@ trap "_cleanup; exit \$status" 0 1 2 3 15
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. ./common.filter
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. ./common.pattern
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# Any format supporting backing files and bdrv_make_empty
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# This test is specific to qcow2
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_supported_fmt qcow2
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_supported_proto file
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_supported_os Linux
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function run_qemu()
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{
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$QEMU -nographic -qmp stdio -serial none "$@" 2>&1 \
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| _filter_testdir | _filter_qmp | _filter_qemu
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}
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for reason in snapshot bitmap; do
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# Four passes:
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# 0: Two-layer backing chain, commit to upper backing file (implicitly)
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@ -66,14 +74,29 @@ _supported_os Linux
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for i in 0 1 2 3; do
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echo
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echo "=== Test pass $i ==="
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echo "=== Test pass $reason.$i ==="
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echo
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len=$((2100 * 1024 * 1024 + 512)) # larger than 2G, and not cluster aligned
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TEST_IMG="$TEST_IMG.base" _make_test_img $len
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TEST_IMG="$TEST_IMG.itmd" _make_test_img -b "$TEST_IMG.base" $len
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_make_test_img -b "$TEST_IMG.itmd" $len
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$QEMU_IMG snapshot -c snap "$TEST_IMG"
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# Update the top image to use a feature that is incompatible with fast path
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case $reason in
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snapshot) $QEMU_IMG snapshot -c snap "$TEST_IMG" ;;
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bitmap)
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run_qemu <<EOF
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{ "execute": "qmp_capabilities" }
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{ "execute": "blockdev-add",
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"arguments": { "driver": "qcow2", "node-name": "drive0",
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"file": { "driver": "file", "filename": "$TEST_IMG" } } }
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{ "execute": "block-dirty-bitmap-add",
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"arguments": { "node": "drive0", "name": "bitmap0",
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"persistent": true, "autoload": true } }
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{ "execute": "quit" }
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EOF
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;;
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esac
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$QEMU_IO -c "write -P 1 0x7ffd0000 192k" "$TEST_IMG.base" | _filter_qemu_io
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$QEMU_IO -c "write -P 2 0x7ffe0000 128k" "$TEST_IMG.itmd" | _filter_qemu_io
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@ -122,8 +145,26 @@ $QEMU_IMG map "$TEST_IMG.base" | _filter_qemu_img_map
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$QEMU_IMG map "$TEST_IMG.itmd" | _filter_qemu_img_map
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$QEMU_IMG map "$TEST_IMG" | _filter_qemu_img_map
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done
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# Check that the reason for slow path is still present, as appropriate
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case $reason in
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snapshot)
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$QEMU_IMG snapshot -l "$TEST_IMG" |
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sed 's/^\(.\{20\}\).*/\1/; s/ *$//' ;;
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bitmap)
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run_qemu <<EOF
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{ "execute": "qmp_capabilities" }
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{ "execute": "blockdev-add",
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"arguments": { "driver": "qcow2", "node-name": "drive0",
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"file": { "driver": "file", "filename": "$TEST_IMG" } } }
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{ "execute": "x-debug-block-dirty-bitmap-sha256",
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"arguments": { "node": "drive0", "name": "bitmap0" } }
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{ "execute": "quit" }
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EOF
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;;
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esac
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done
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done
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# success, all done
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echo "*** done"
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@ -1,6 +1,6 @@
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QA output created by 176
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=== Test pass 0 ===
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=== Test pass snapshot.0 ===
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Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=2202010112
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Formatting 'TEST_DIR/t.IMGFMT.itmd', fmt=IMGFMT size=2202010112 backing_file=TEST_DIR/t.IMGFMT.base
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@ -36,8 +36,11 @@ Offset Length File
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0x7ffd0000 0x10000 TEST_DIR/t.IMGFMT.base
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0x7ffe0000 0x20000 TEST_DIR/t.IMGFMT.itmd
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0x83400000 0x200 TEST_DIR/t.IMGFMT.itmd
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Snapshot list:
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ID TAG
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1 snap
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=== Test pass 1 ===
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=== Test pass snapshot.1 ===
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Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=2202010112
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Formatting 'TEST_DIR/t.IMGFMT.itmd', fmt=IMGFMT size=2202010112 backing_file=TEST_DIR/t.IMGFMT.base
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@ -74,8 +77,11 @@ Offset Length File
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0x7ffe0000 0x10000 TEST_DIR/t.IMGFMT.itmd
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0x7fff0000 0x10000 TEST_DIR/t.IMGFMT
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0x83400000 0x200 TEST_DIR/t.IMGFMT
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Snapshot list:
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ID TAG
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1 snap
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=== Test pass 2 ===
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=== Test pass snapshot.2 ===
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Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=2202010112
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Formatting 'TEST_DIR/t.IMGFMT.itmd', fmt=IMGFMT size=2202010112 backing_file=TEST_DIR/t.IMGFMT.base
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@ -112,8 +118,11 @@ Offset Length File
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0x7ffe0000 0x10000 TEST_DIR/t.IMGFMT.itmd
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0x7fff0000 0x10000 TEST_DIR/t.IMGFMT
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0x83400000 0x200 TEST_DIR/t.IMGFMT
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Snapshot list:
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ID TAG
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1 snap
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=== Test pass 3 ===
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=== Test pass snapshot.3 ===
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Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=2202010112
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Formatting 'TEST_DIR/t.IMGFMT.itmd', fmt=IMGFMT size=2202010112 backing_file=TEST_DIR/t.IMGFMT.base
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@ -147,4 +156,203 @@ Offset Length File
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0x7ffe0000 0x10000 TEST_DIR/t.IMGFMT.itmd
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0x7fff0000 0x10000 TEST_DIR/t.IMGFMT
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0x83400000 0x200 TEST_DIR/t.IMGFMT
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Snapshot list:
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ID TAG
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1 snap
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=== Test pass bitmap.0 ===
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Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=2202010112
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Formatting 'TEST_DIR/t.IMGFMT.itmd', fmt=IMGFMT size=2202010112 backing_file=TEST_DIR/t.IMGFMT.base
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Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=2202010112 backing_file=TEST_DIR/t.IMGFMT.itmd
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QMP_VERSION
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{"return": {}}
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{"return": {}}
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{"return": {}}
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{"return": {}}
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{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "SHUTDOWN", "data": {"guest": false}}
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wrote 196608/196608 bytes at offset 2147287040
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192 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 131072/131072 bytes at offset 2147352576
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128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 65536/65536 bytes at offset 2147418112
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64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 512/512 bytes at offset 2202009600
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512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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Image committed.
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read 196608/196608 bytes at offset 2147287040
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192 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 512/512 bytes at offset 2202009600
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512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 65536/65536 bytes at offset 2147287040
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64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 65536/65536 bytes at offset 2147352576
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64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 65536/65536 bytes at offset 2147418112
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64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 512/512 bytes at offset 2202009600
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512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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Offset Length File
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0x7ffd0000 0x30000 TEST_DIR/t.IMGFMT.base
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Offset Length File
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0x7ffd0000 0x10000 TEST_DIR/t.IMGFMT.base
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0x7ffe0000 0x20000 TEST_DIR/t.IMGFMT.itmd
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0x83400000 0x200 TEST_DIR/t.IMGFMT.itmd
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Offset Length File
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0x7ffd0000 0x10000 TEST_DIR/t.IMGFMT.base
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0x7ffe0000 0x20000 TEST_DIR/t.IMGFMT.itmd
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0x83400000 0x200 TEST_DIR/t.IMGFMT.itmd
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QMP_VERSION
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{"return": {}}
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{"return": {}}
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{"return": {"sha256": "e12600978d86b5a453861ae5c17d275204673fef3874b7c3c5433c6153d84706"}}
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{"return": {}}
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{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "SHUTDOWN", "data": {"guest": false}}
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=== Test pass bitmap.1 ===
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Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=2202010112
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Formatting 'TEST_DIR/t.IMGFMT.itmd', fmt=IMGFMT size=2202010112 backing_file=TEST_DIR/t.IMGFMT.base
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Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=2202010112 backing_file=TEST_DIR/t.IMGFMT.itmd
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QMP_VERSION
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{"return": {}}
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{"return": {}}
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{"return": {}}
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{"return": {}}
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{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "SHUTDOWN", "data": {"guest": false}}
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wrote 196608/196608 bytes at offset 2147287040
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192 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 131072/131072 bytes at offset 2147352576
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128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 65536/65536 bytes at offset 2147418112
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64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 512/512 bytes at offset 2202009600
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512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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Image committed.
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read 196608/196608 bytes at offset 2147287040
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192 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 512/512 bytes at offset 2202009600
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512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 65536/65536 bytes at offset 2147287040
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64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 65536/65536 bytes at offset 2147352576
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64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 65536/65536 bytes at offset 2147418112
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64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 512/512 bytes at offset 2202009600
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512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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Offset Length File
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0x7ffd0000 0x30000 TEST_DIR/t.IMGFMT.base
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Offset Length File
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0x7ffd0000 0x10000 TEST_DIR/t.IMGFMT.base
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0x7ffe0000 0x20000 TEST_DIR/t.IMGFMT.itmd
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0x83400000 0x200 TEST_DIR/t.IMGFMT.itmd
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Offset Length File
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0x7ffd0000 0x10000 TEST_DIR/t.IMGFMT.base
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0x7ffe0000 0x10000 TEST_DIR/t.IMGFMT.itmd
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0x7fff0000 0x10000 TEST_DIR/t.IMGFMT
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0x83400000 0x200 TEST_DIR/t.IMGFMT
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QMP_VERSION
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{"return": {}}
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{"return": {}}
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{"return": {"sha256": "e12600978d86b5a453861ae5c17d275204673fef3874b7c3c5433c6153d84706"}}
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{"return": {}}
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{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "SHUTDOWN", "data": {"guest": false}}
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=== Test pass bitmap.2 ===
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Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=2202010112
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Formatting 'TEST_DIR/t.IMGFMT.itmd', fmt=IMGFMT size=2202010112 backing_file=TEST_DIR/t.IMGFMT.base
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Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=2202010112 backing_file=TEST_DIR/t.IMGFMT.itmd
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QMP_VERSION
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{"return": {}}
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{"return": {}}
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{"return": {}}
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{"return": {}}
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{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "SHUTDOWN", "data": {"guest": false}}
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wrote 196608/196608 bytes at offset 2147287040
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192 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 131072/131072 bytes at offset 2147352576
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128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 65536/65536 bytes at offset 2147418112
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64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 512/512 bytes at offset 2202009600
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512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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Image committed.
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read 196608/196608 bytes at offset 2147287040
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192 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 512/512 bytes at offset 2202009600
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512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 65536/65536 bytes at offset 2147287040
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64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 65536/65536 bytes at offset 2147352576
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64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 65536/65536 bytes at offset 2147418112
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64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 512/512 bytes at offset 2202009600
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512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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Offset Length File
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0x7ffd0000 0x30000 TEST_DIR/t.IMGFMT.base
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Offset Length File
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0x7ffd0000 0x10000 TEST_DIR/t.IMGFMT.base
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0x7ffe0000 0x20000 TEST_DIR/t.IMGFMT.itmd
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0x83400000 0x200 TEST_DIR/t.IMGFMT.itmd
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Offset Length File
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0x7ffd0000 0x10000 TEST_DIR/t.IMGFMT.base
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0x7ffe0000 0x10000 TEST_DIR/t.IMGFMT.itmd
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0x7fff0000 0x10000 TEST_DIR/t.IMGFMT
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0x83400000 0x200 TEST_DIR/t.IMGFMT
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QMP_VERSION
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{"return": {}}
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{"return": {}}
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{"return": {"sha256": "e12600978d86b5a453861ae5c17d275204673fef3874b7c3c5433c6153d84706"}}
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{"return": {}}
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{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "SHUTDOWN", "data": {"guest": false}}
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=== Test pass bitmap.3 ===
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Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=2202010112
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Formatting 'TEST_DIR/t.IMGFMT.itmd', fmt=IMGFMT size=2202010112 backing_file=TEST_DIR/t.IMGFMT.base
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Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=2202010112 backing_file=TEST_DIR/t.IMGFMT.itmd
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QMP_VERSION
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{"return": {}}
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{"return": {}}
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{"return": {}}
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{"return": {}}
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{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "SHUTDOWN", "data": {"guest": false}}
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wrote 196608/196608 bytes at offset 2147287040
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192 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 131072/131072 bytes at offset 2147352576
|
||||
128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
|
||||
wrote 65536/65536 bytes at offset 2147418112
|
||||
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
|
||||
wrote 512/512 bytes at offset 2202009600
|
||||
512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
|
||||
Image committed.
|
||||
read 65536/65536 bytes at offset 2147287040
|
||||
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
|
||||
read 65536/65536 bytes at offset 2147352576
|
||||
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
|
||||
read 65536/65536 bytes at offset 2147418112
|
||||
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
|
||||
read 512/512 bytes at offset 2202009600
|
||||
512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
|
||||
Offset Length File
|
||||
0x7ffd0000 0x30000 TEST_DIR/t.IMGFMT.base
|
||||
0x83400000 0x200 TEST_DIR/t.IMGFMT.base
|
||||
Offset Length File
|
||||
0x7ffd0000 0x10000 TEST_DIR/t.IMGFMT.base
|
||||
0x7ffe0000 0x20000 TEST_DIR/t.IMGFMT.itmd
|
||||
0x83400000 0x200 TEST_DIR/t.IMGFMT.base
|
||||
Offset Length File
|
||||
0x7ffd0000 0x10000 TEST_DIR/t.IMGFMT.base
|
||||
0x7ffe0000 0x10000 TEST_DIR/t.IMGFMT.itmd
|
||||
0x7fff0000 0x10000 TEST_DIR/t.IMGFMT
|
||||
0x83400000 0x200 TEST_DIR/t.IMGFMT
|
||||
QMP_VERSION
|
||||
{"return": {}}
|
||||
{"return": {}}
|
||||
{"return": {"sha256": "e12600978d86b5a453861ae5c17d275204673fef3874b7c3c5433c6153d84706"}}
|
||||
{"return": {}}
|
||||
{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "SHUTDOWN", "data": {"guest": false}}
|
||||
*** done
|
||||
|
||||
Loading…
Reference in New Issue
Block a user