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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,

...olation without the previous patch to the nbd plugin is sufficient to make the testsuite deadlock go away. Signed-off-by: Eric Blake <eblake@redhat.com> --- src/connections.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/src/connections.c b/src/connections.c index 46f2cd4..6c1f8cd 100644 --- a/src/connections.c +++ b/src/connections.c @@ -1056,8 +1056,9 @@ recv_request_send_reply (struct connection *conn) /* Read the request packet. */ { ACQUIRE_LOCK_FOR_CURRENT_SCOPE (&conn->read_lock); - if (get_status (conn) < 0) - return -1; + r =...