[Libguestfs] [nbdkit PATCH 0/2] Fix testsuite deadlocks during close

Commit 9e6d990f exposed a pre-existing deadlock between the nbd plugin as client and parallel nbdkit as server. Prior to that commit, the deadlock was "resolved" because we unloaded the .so in parallel to a .close callback that never completed (yes, it's nasty that it usually? let the testsuite pass), but now we correctly refuse to unload a plugin that has not returned from .close, which makes 'test-nbd' and 'test-parallel-nbd.sh' hang. Here are two patches which each independently break the deadlock, but where both patches should be applied so that we are robust to non-nbdkit partners that exhibit the same behaviors as our unpatched deadlock. Since testsuite hangs make automated testing less than useful, I'm going ahead and pushing them now. Eric Blake (2): nbd: Inform server of intent to quit nbd: Don't read after client sends NBD_CMD_DISC src/connections.c | 5 +++-- plugins/nbd/nbd.c | 4 +++- 2 files changed, 6 insertions(+), 3 deletions(-) -- 2.14.3