[Bug 212413] FreeBSD 11-RC2 crashing after some time

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212413

freebsd at mcwest.org changed:

           What    |Removed                     |Added
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                 CC|                            |freebsd at mcwest.org

--- Comment #3 from freebsd at mcwest.org ---
(In reply to nicolas from comment #2)
FYI, including ALTQ in the kernel config switches igb(4) interfaces to legacy
single-queue mode.  I have seen crashes like these with high-bandwidth traffic
when the driver is in this mode.  If you need ALTQ, add a queue to limit
throughput through igb interfaces.  For example, the following workaround has
prevented crashes on my systems for the last six months:

     ## Limit bandwidth on internal interface to avoid igb driver bug
     altq on $int_if cbq bandwidth 404Mb queue { internal }
     queue internal bandwidth 99% priority 1 cbq(default red borrow)

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