I see hangs killing opensm related to a bug in user_mad.c. The problem appears
to be:
ib_umad_close()
downgrade_write(&file->port->mutex)
ib_unregister_mad_agent(...)
up_read(&file->port->mutex)
ib_unregister_mad_agent() flushes any outstanding MADs, resulting in calls to
send_handler() and recv_handler(), both of which call queue_packet():
queue_packet()
down_read(&file->port->mutex)
...
up_read(&file->port->mutex)
ib_umad_kill_port() has a similar issue as ib_umad_close().
Does anyone know the reasoning for holding the mutex around
ib_unregister_mad_agent()?
- Sean
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