[Libguestfs] [PATCH nbdkit 0/2] connections: Protect open and close callbacks with the request lock.

I'm fairly sure that these bugs which appear in the Python plugin: https://bugzilla.redhat.com/show_bug.cgi?id=1566516 https://bugzilla.redhat.com/show_bug.cgi?id=1566522 are really bugs in the SERIALIZE_ALL_REQUESTS thread model. See the first patch for the full explanation. The second patch is a fix for a race condition which is probably nudged into being by the first patch. Now this all works, EXCEPT it quite reliably breaks either the NBD plugin or ‘tests/test-parallel-nbd.sh’. I have no idea why because as far as I know the change should not affect the NBD plugin or that test in any way. Unfortunately both are rather complex to debug. Rich.