[Bug 234846] [lagg] race condition when adding port

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234846

--- Comment #15 from Alexandre martins <alexandre.martins at stormshield.eu> ---
Hello Stephen,

I'm sorry, I have made a mistake when I give the revision of the bug, It's the
317696 that introduce the bug, when the lock was split in two (SX plus RM).

I'm resume all of my story:

- We are working on a base of FreeBSD 10.3, and faced crashes with LACP
- We updated the if_lagg code to the revision 321477, which solved our initial
problem
- However, another crash is occurring (the one that I put the backtrace here)
- When I searched the cause of the race, I take the wrong lock change (333612
instead of 321477)

The root cause of the problem remain the same: ether_input call lagg_input with
the lacp port not fully initialized.
The function lagg_input locks the (RM / EPOCK) in read mode but that lock is
not taken in lagg_port_create/lagg_port_destroy, who is locked by the SX.

The first patch with LAGG_PORT_DISABLED works for us.

My apologies for the confusion.

Best regards,

Alexandre

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