[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: Mon, 11 Jul 2022 08:51:09 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264257

--- Comment #78 from Michael Tuexen <tuexen@freebsd.org> ---
From the pcap information we were able to reconstruct the packet sequence, but
not the exact timing. Unfortunately, we were not able to reproduce the issue.
However, it seems hard, to extend the pcap logging.

So I suggest to use the BlackBox Logging instead.

Could you:

* Add
  options TCP_BLACKBOX
  to you kernel configuration file and recompile the kernel.
  You can remove the TCPPCAP option, if you want.

* Add
  net.inet.tcp.bb.log_auto_all=1
  net.inet.tcp.bb.log_auto_ratio=1
  net.inet.tcp.bb.log_auto_mode=1
  net.inet.tcp.bb.log_session_limit=200

This should enable BlackBox Logging on all TCP connections and it will the last
200
events per TCP connection stored in the end point. Once the system has crashed,
please
provide a core. This time we should not only get the packet being
sent/received, but
also internal TCP state variables and information about the retransmission
timer.
If this information is not enough, we can adhoc extend the TCP Black Box
Logging.

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