Re: general protection fault panic

On Mon, Mar 26, 2012 at 10:41 AM, Steve Kargl
<sgk_at_troutmask.apl.washington.edu> 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
> 97              __asm __volatile("sti; hlt");
> (kgdb) x/10i $rip
> 0xffffffff806dc186 <acpi_cpu_c1+6>:     leaveq
> 0xffffffff806dc187 <acpi_cpu_c1+7>:     retq
> 0xffffffff806dc188 <acpi_cpu_c1+8>:     nopl   0x0(%rax,%rax,1)
> 0xffffffff806dc190 <nexus_acpi_attach>: push   %rbp
> 0xffffffff806dc191 <nexus_acpi_attach+1>:       mov    %rsp,%rbp
> 0xffffffff806dc194 <nexus_acpi_attach+4>:       push   %r12
> 0xffffffff806dc196 <nexus_acpi_attach+6>:       push   %rbx
> 0xffffffff806dc197 <nexus_acpi_attach+7>:       mov    %rdi,%rbx
> 0xffffffff806dc19a <nexus_acpi_attach+10>:
>    callq  0xffffffff807551b0 <nexus_init_resources>
> 0xffffffff806dc19f <nexus_acpi_attach+15>:      mov    %rbx,%rdi
>
>
> In another email thread, it appears that jkim is chasing
> down some issues with the latest ACPI code.  Perhaps, this
> is related?
>
> If it helps, I'll put kernel.debug and vmcore.0 at
> http://troutmask.apl.washington.edu/~kargl/jhb
> --
> Steve
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Just in case it's related: I'm seeing the following error on my
-current system when building with clang:

clang -c -O -pipe  -std=c99 -g -Wall -Wredundant-decls
-Wnested-externs -Wstrict-prototypes  -Wmissing-prototypes
-Wpointer-arith -Winline -
Wcast-qual  -Wundef -Wno-pointer-sign -fformat-extensions
-Wmissing-include-dirs -fdiagnostics-show-option
-Wno-error-tautological-compare
 -Wno-error-empty-body  -Wno-error-parentheses-equality -nostdinc  -I.
-I/usr/src/sys -I/usr/src/sys/contrib/altq -D_KERNEL -DHAVE_KERNEL_OP
TION_HEADERS -include opt_global.h  -mno-aes -mno-avx -mno-mmx
-mno-sse -msoft-float -ffreestanding -fstack-protector -Werror
/usr/src/sys/
x86/x86/local_apic.c
/usr/src/sys/x86/x86/local_apic.c:312:2: error: array index of '-16'
indexes before the beginning of the array [-Werror,-Warray-bounds]
        lapics[apic_id].la_ioint_irqs[IDT_DTRACE_RET - APIC_IO_INTS] =
        ^                             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/src/sys/x86/x86/local_apic.c:123:2: note: array 'la_ioint_irqs'
declared here
        int la_ioint_irqs[APIC_NUM_IOINTS + 1];
        ^
1 error generated.
*** [local_apic.o] Error code 1

-- 
Jos Backus
jos at catnook.com