Hello,
I am looking at a very peculiar race condition and dont quite
understand why rdma cm
is generating a certain event.
The race is as follows.
Lets say Process P1 is connection to Process P2 (RC connection) using RDMA CM.
Also the connection is asynchronous, i.e the fd associated with the cm
event channel has been converted to non blocking.
Consider Time along the vertical access.
P1-> addr_resolve()
select(cm_event_fd)
gets RDMA_CM_ADDR_RESOLVED
rout_resolve()
gets RDMA_CM_ROUTE_RESOLVE
connect():
P2: Gets Connect request
P1: -> Dies
P2: create_qp() -> Fails -> deletes the cmid associated
P2: select(cm_fd)
P2: gets RDMA_CM_EVENT_REJECTED -> event->status = 4...
P2 does not have ANY outstanding connections. It is not trying to connect to
anything. It is just passively accepting connections.
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