74f27eadea
This patch adds a test where we cancel a throttled mirror job and immediately close the VM before it can be cancelled. Doing so will invoke bdrv_drain_all() while the mirror job tries to drain the throttled node. When bdrv_drain_all_end() tries to lift its drain on the throttle node, the job will exit and replace the current root node of the BB drive0 (which is the job's filter node) by the throttle node. Before the previous patch, this replacement did not increase drive0's quiesce_counter by a sufficient amount, so when bdrv_parent_drained_end() (invoked by bdrv_do_drained_end(), invoked by bdrv_drain_all_end()) tried to end the drain on all of the throttle node's parents, it decreased drive0's quiesce_counter below 0 -- which fails an assertion. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
41 lines
1.7 KiB
Plaintext
41 lines
1.7 KiB
Plaintext
Finishing a commit job with background reads
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============================================
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=== Create backing chain and start VM ===
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Formatting 'TEST_DIR/PID-t.qcow2.mid', fmt=qcow2 size=134217728 cluster_size=65536 lazy_refcounts=off refcount_bits=16
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Formatting 'TEST_DIR/PID-t.qcow2', fmt=qcow2 size=134217728 cluster_size=65536 lazy_refcounts=off refcount_bits=16
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=== Start background read requests ===
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=== Run a commit job ===
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{"execute": "block-commit", "arguments": {"auto-finalize": false, "device": "overlay", "job-id": "job0", "top-node": "mid"}}
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{"return": {}}
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{"execute": "job-finalize", "arguments": {"id": "job0"}}
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{"return": {}}
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{"data": {"id": "job0", "type": "commit"}, "event": "BLOCK_JOB_PENDING", "timestamp": {"microseconds": "USECS", "seconds": "SECS"}}
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{"data": {"device": "job0", "len": 134217728, "offset": 134217728, "speed": 0, "type": "commit"}, "event": "BLOCK_JOB_COMPLETED", "timestamp": {"microseconds": "USECS", "seconds": "SECS"}}
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Closing the VM while a job is being cancelled
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=============================================
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=== Create images and start VM ===
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Formatting 'TEST_DIR/PID-src.qcow2', fmt=qcow2 size=134217728 cluster_size=65536 lazy_refcounts=off refcount_bits=16
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Formatting 'TEST_DIR/PID-dst.qcow2', fmt=qcow2 size=134217728 cluster_size=65536 lazy_refcounts=off refcount_bits=16
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wrote 1048576/1048576 bytes at offset 0
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1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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=== Start a mirror job ===
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{"execute": "blockdev-mirror", "arguments": {"device": "src-throttled", "job-id": "job0", "sync": "full", "target": "dst"}}
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{"return": {}}
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{"execute": "block-job-cancel", "arguments": {"device": "job0"}}
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{"return": {}}
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{"execute": "quit", "arguments": {}}
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{"return": {}}
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