[Bug 211450] Fatal trap 12: page fault while in kernel mode (iwm0: firmware error 0x2010000) (Intel 7260)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211450

--- Comment #3 from Zesen Qian <freebsd at riaqn.org> ---
I added the part of vmcore when it crashed as attachment.

Here is some info about my system:

riaqn at thinkpad ~> freebsd-version -ku
11.2-RELEASE
11.2-RELEASE
riaqn at thinkpad ~> sudo cat /var/crash/info.2
Dump header from device: /dev/ada0p3
  Architecture: amd64
  Architecture Version: 2
  Dump Length: 509345792
  Blocksize: 512
  Dumptime: Sun Jul  1 12:27:19 2018
  Hostname: thinkpad.riaqn.org
  Magic: FreeBSD Kernel Dump
  Version String: FreeBSD 11.2-RELEASE #0 r335510: Fri Jun 22 04:32:14 UTC 2018
    root at releng2.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC
  Panic String: page fault
  Dump Parity: 3006087772
  Bounds: 2
  Dump Status: good

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