[Bug 246951] carp(4): Active CARP member crashes: panic, trap_pfault, ip_input || ip_output when using ipSec, AES-NI (on Intel I350)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246951

Ryan Moeller <freqlabs at FreeBSD.org> changed:

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                 CC|                            |freqlabs at FreeBSD.org

--- Comment #15 from Ryan Moeller <freqlabs at FreeBSD.org> ---
I have a FreeNAS bug report where ifa_addr is NULL on 11.3, too. I was
suspecting some local patches we have for dealing with various IGMP / multicast
issues, but I did not find anything in auditing those patches. I haven't found
any way to explain ifa_addr being NULL in an ifma that is still linked into a
list.

In my user's case the panic is cropping up in igmp_fasttimo. Though the
circumstances are different, I wonder if these may be caused by the same
underlying problem.

One thing I have thought to double-check next is making sure that the maddr
locks match up with the correct ifp everywhere the list is modified.

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