[Bug 255465] Kernel panic with Intel Wireless 4965AGN chip

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255465

            Bug ID: 255465
           Summary: Kernel panic with Intel Wireless 4965AGN chip
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: wireless
          Assignee: wireless at FreeBSD.org
          Reporter: radoslaw.chmielarz at emersi.eu

Hi,

After attaching Intel Wireless WiFi Link 4965AGN through PCIe slot I have
experienced a kernel panic on startup with stack trace pointing to
ieee80211_chan_init() originating from iwn_attach(). Probably the kernel is
pointing at a more precise piece of code but I'm using an USB keyboard and the
keyboard driver is not yet loaded so I can't type anything on DDB console.

Despite kernel panic coredump was not created. This is most probably because on
this device I have only limited amount of disk space (4GB).

If there is a way of using devctl rescan to hotplug this device after system
startup it would be great. The only idea I had is to modify iwn.c and remove
code from it until the system start panicking again to point me to the correct
line of code. But this is very time consuming because of all the recompiles.

I've made a low-tech picture with my phone.

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