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iotest 151: add test-case that shows active mirror dead-lock
There is a dead-lock in active mirror: when we have parallel intersecting requests (note that non intersecting requests may be considered intersecting after aligning to mirror granularity), it may happen that request A waits request B in mirror_wait_on_conflicts() and request B waits for A. Look at the test for details. Test now dead-locks, that's why it's disabled. Next commit will fix mirror and enable the test. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-Id: <20210702211636.228981-3-vsementsov@virtuozzo.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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