Date: Mon, 26 Mar 2012 10:59:18 -0700 From: Steve Kargl <sgk@troutmask.apl.washington.edu> To: John Baldwin <jhb@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: general protection fault panic Message-ID: <20120326175918.GA2053@troutmask.apl.washington.edu> In-Reply-To: <201203261353.25138.jhb@freebsd.org> References: <20120323222313.GA1331@troutmask.apl.washington.edu> <201203261318.37373.jhb@freebsd.org> <20120326174155.GA1931@troutmask.apl.washington.edu> <201203261353.25138.jhb@freebsd.org>
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On Mon, Mar 26, 2012 at 01:53:25PM -0400, John Baldwin wrote:
> On Monday, March 26, 2012 1:41:55 pm Steve Kargl wrote:
> > On Mon, Mar 26, 2012 at 01:18:37PM -0400, John Baldwin wrote:
> > > On Monday, March 26, 2012 12:21:29 pm Steve Kargl wrote:
> > >
> > > You know your APIC ID is 0, so you should be able to find the IRQ for vector
> > > 51 from here in apic_idt_to_irq():
> > >
> > > irq = lapics[apic_id].la_ioint_irqs[vector - APIC_IO_INTS];
> > >
> > > Your apic_id is 0, and APIC_IO_INTS is 48, so you should be able to do this
> > > in kgdb:
> > >
> > > p lapics[0].la_ioint_irqs[3]
> > >
> > > That should give you an index, and intr_lookup_source() just does an array
> > > lookup. However, I'd be curious to see what the assembly looks like
> > > (x/10i $rip at this frame).
> > >
> >
> >
> > (kgdb) p lapics[0].la_ioint_irqs[3]
> > $1 = 16
> > (kgdb) frame 27
> > #27 0xffffffff806dc186 in acpi_cpu_c1 ()
> > at /usr/src/sys/amd64/acpica/acpi_machdep.c:97
>
> Sorry, I meant down at the frame that faulted (frame 7 in this case).
>
(kgdb) frame 7
#7 0xffffffff80751232 in lapic_handle_intr (vector=51,
frame=0xffffff8000229a70) at /usr/src/sys/x86/x86/local_apic.c:777
777 {
(kgdb) x/10i $rip
0xffffffff80751232 <lapic_handle_intr+2>: stos %eax,%es:(%rdi)
0xffffffff80751233 <lapic_handle_intr+3>: (bad)
0xffffffff80751234 <lapic_handle_intr+4>: pop %rbp
0xffffffff80751235 <lapic_handle_intr+5>: pop %rsi
0xffffffff80751236 <lapic_handle_intr+6>: fsubr %st(3),%st
0xffffffff80751238 <lapic_handle_intr+8>: (bad)
0xffffffff80751239 <lapic_handle_intr+9>: or $0xac1ae6b3,%eax
0xffffffff8075123e <lapic_handle_intr+14>: out %eax,$0x19
0xffffffff80751240 <lapic_handle_intr+16>:
jl 0xffffffff8075125e <lapic_handle_intr+46>
0xffffffff80751242 <lapic_handle_intr+18>: adc %r12d,0xc6aa671(%rdi)
--
Steve
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