dcons unload panic (including debug info): Fatal trap 12: page fault while in kernel mode

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dcons unload panic (including debug info): Fatal trap 12: page fault while in kernel mode

Eitan Adler-4
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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