Date: Wed, 11 Apr 2018 21:22:33 -0700 From: Eitan Adler <lists@eitanadler.com> To: "hackers@freebsd.org" <hackers@freebsd.org> Subject: dcons unload panic (including debug info): Fatal trap 12: page fault while in kernel mode Message-ID: <CAF6rxgkM=M7e_PNCEMNRyV0z%2BzC40qZrW-1hwDLC7uXeJ9YTbg@mail.gmail.com>
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How to reproduce:
kldload dcons; kldunload dcons
Unread portion of the kernel message buffer:
[124]
[124]
[124] Fatal trap 12: page fault while in kernel mode
[124] cpuid = 10; apic id = 0a
[124] fault virtual address = 0xffffffff8423ef48
[124] fault code = supervisor read data, page not present
[124] instruction pointer = 0x20:0xffffffff80be84d0
[124] stack pointer = 0x28:0xfffffe0077bff920
[124] frame pointer = 0x28:0xfffffe0077bff930
[124] code segment = base 0x0, limit 0xfffff, type 0x1b
[124] = DPL 0, pres 1, long 1, def32 0, gran 1
[124] processor eflags = interrupt enabled, resume, IOPL = 0
[124] current process = 12 (swi6: Giant taskq)
__curthread () at ./machine/pcpu.h:230
230 __asm("movq %%gs:%1,%0" : "=r" (td)
more here: https://reviews.freebsd.org/P170
--
Eitan Adler
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