[Bug 264257] [tcp] Panic: Fatal trap 12: page fault while in kernel mode (if_io_tqg_4) - m_copydata ... at /usr/src/sys/kern/uipc_mbuf.c:659

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264257

--- Comment #80 from Richard Scheffenegger <rscheff@freebsd.org> ---
(In reply to Chad Smith from comment #79)

Do the affected servers report IP-layer output errors? Or low mbuf situations?

(netstat -s after a bit of uptime may show increasing IP output error
counters).

Background: As the full packet trace (without timing) by itself is not
sufficient to reproduce the issue, one possibility is that very infrequent
error handling is involved in the introduction of the problematic state - and
this may only happen on quite busy machines where mbuf allocation, or packet
output issues are showing up.

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