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The 'throttle' block driver implements .bdrv_co_drain_end, so blockdev-reopen will have to wait for it to complete in the polling loop at the end of qmp_blockdev_reopen(). This makes AIO_WAIT_WHILE() release the AioContext lock, which causes a crash if the lock hasn't correctly been taken. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Message-Id: <20220203140534.36522-3-kwolf@redhat.com> Reviewed-by: Hanna Reitz <hreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>