[Bug 278081] Kernel panic in bwn

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278081

            Bug ID: 278081
           Summary: Kernel panic in bwn
           Product: Base System
           Version: 13.3-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: wireless
          Assignee: wireless@FreeBSD.org
          Reporter: tom.mcclean@gmail.com

The Broadcom wifi driver causes a kernel panic (page fault) at line 1041 of
/usr/src/sys/dev/bwn/if_bwn.c on a MacBook Pro 5,5 witha Broadcom BCM4322
running a fresh install of FreeBSD 13.3.

This occurs every time the wifi connection is configured, up and being actively
used, but the precise timing varies. It appears to be related to the overall
volume of traffic. The panic sometimes occurs within minutes of cold boot,
sometimes up to a quarter of an hour later.

This issue appears to be specific to FreeBSD 13.3. It does not arise on the
same machine running a fresh install of FreeBSD 13.2 (which runs regularly for
at least 8h under heavy wifi load with no issues). Nor does the difference
appear to be due to configuration issues. Under both FreeBSD 13.2 and 13.3, I
use a custom kernel where the only change from GENERIC is to enable options for
BWN_DEBUG and BWN_GPL_PHY. Both machines have correct firmware installed by
building the port net/bwn-firmware-kmod with no special options.

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