[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

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 20 Jul 2022 18:45:01 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264257

--- Comment #85 from Richard Scheffenegger <rscheff@freebsd.org> ---
Hi Chad,

Thank you very much for your effort. Are you sure about this panic - in the
backtrace, it looks like an issue happend in 

#6 0xffffffff80d55ec7 at pfil_run_hooks+0x97
#7 0xffffffff8239af37 at bridge_pfil+0x497

(bridging code, not tcp).

In the few instances we have seen in more detail, it looked like TLS handshake
was being performed when - for one reason or another - there was no response
from the client for an extended period of time (probably 1-2 min), before
seeing ACKs (and SACKs) again.

The IP stats in your case seem pretty clean - we suspected that a missing
adjustment in a local error handling path may have something to do with this,
but after doing some error injection prior and after addressing this, the
behavior seems sufficiently different that I'm not convinced that is the
culprit either.

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