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Cc: Attilio Rao <attilio@freebsd.org>
Subject: Re: experimental qemu-devel port update, please test!
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On Monday 09 July 2007, Attilio Rao wrote:
> 2007/7/9, Eric Anderson <anderson@freebsd.org>:
> > Fatal trap 12: page fault while in kernel mode
> > cpuid = 0; apic id = 00
> > fault virtual address   = 0x82
> > fault code              = supervisor read, page not present
> > instruction pointer     = 0x20:0xc0928f00
> > stack pointer           = 0x28:0xe57b7a3c
> > frame pointer           = 0x28:0xe57b7a50
> > code segment            = base 0x0, limit 0xfffff, type 0x1b
> >                          = DPL 0, pres 1, def32 1, gran 1
> > processor eflags        = interrupt enabled, resume, IOPL = 0
> > current process         = 69 (qemu)
> >
> >
> > #9  0xc0928f00 in _vm_map_lock (map=0x1, file=0x0, line=0) at
> > /usr/src/sys/vm/vm_map.c:421
> > #10 0xc092986d in vm_map_wire (map=0x1, start=677306368,
> > end=677310464, flags=1) at /usr/src/sys/vm/vm_map.c:1964
>
> Please also note that stack here seems highly corrupted since values
> passed to _vm_map_lock are not possible (or there is something
> serious going on with them).

I had this exact same crash when attempting to use kqemu on a recent 
current. It appears as if the value it got for curproc was bad. Is 
kqemu messing with the kernel's %fs value perhaps?