Roland Dreier wrote:
Looks like the same crash mst saw related to the multicast module
being unloaded and then having sa call back into it. One small clue:
> esi: f38a5bec edi: f38a5bf4 ebp: fffffffc esp: f599be60
ebp is -4, which is -EINTR. So this may be a callback from sa_query's
send_handler() caused by a IB_WC_WR_FLUSH_ERR status.
This makes sense given the call trace. When ib_sa is unloading, it unregisters
its mad_agent, which results in canceling all outstanding MADs.
What doesn't make sense to me is how ib_multicast could have unloaded while
there are any outstanding SA queries. All queries hold a reference on a MC
group until they complete. And all groups reference a port. The module
shouldn't unload until all references are released on all ports.
I removed some code that is intended to speed up cleanup, but is unnecessary.
We can see if that helps, but I'm skeptical.
- Sean
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