block-nbd was refacted during release 6.2.0, but we didn't induced
all the needed patches within the 6.2.0 baseline, which leads to
vm crash during migration.
the reasons are as below:
when iothread is configured, the coroutines should get back to
the exact iothread that was out of. But within the 6.2.0 baseline,
patches were missing, nbd related coroutine didn't have its related
aio_context. It in fact get to the mainline aio_context, the mistaken
context leads to vm crash.
