> On Wed, 24 Oct 2007 12:54:36 +0100
> Andy Whitcroft <apw@shadowen.org> wrote:
>
>> On Tue, Oct 23, 2007 at 08:44:20PM +0200, Jens Axboe wrote:
>>> On Tue, Oct 23 2007, Kamalesh Babulal wrote:
>>>> Hi,
>>>>
>>>> Kernel oops is triggered while running fsx-linux test, followed by cpu softlock
>>>> over the AMD box
>>>>
>>>> Unable to handle kernel NULL pointer dereference at 0000000000000018 RIP:
>>>> [<ffffffff8021f2f6>] gart_map_sg+0x26c/0x406
>>>> PGD 10185b067 PUD 10075b067 PMD 0
>>>> Oops: 0002 [1] SMP
>>>> CPU 3
>>>> Modules linked in:
>>>> Pid: 18676, comm: fsx-linux Not tainted 2.6.23-git18-autokern1 #1
>>>> RIP: 0010:[<ffffffff8021f2f6>] [<ffffffff8021f2f6>] gart_map_sg+0x26c/0x406
>>>> RSP: 0000:ffff810181edf948 EFLAGS: 00010002
>>> Can you check where gart_map_sg+0x26c is at? Make sure you have
>>> CONFIG_DEBUG_INFO defined, then do:
>>>
>>> $ gdb vmlinux
>>> $ l *gart_map_sg+0x26c
>> Ok, this problem still seems to be about in 2.6.24-rc1. Here is the gdb
>> output from that version, the panic (also below) seems the same:
>>
>> (gdb) l *gart_map_sg+0x26c
>> 0xffffffff8022011e is in gart_map_sg (arch/x86/kernel/pci-gart_64.c:433).
>> 428 goto error;
>> 429 out++;
>> 430 flush_gart();
>> 431 if (out < nents) {
>> 432 sgmap = sg_next(sgmap);
>> 433 sgmap->dma_length = 0;
>> 434 }
>> 435 return out;
>> 436
>> 437 error:
>>
>> So it seems sg_next has returned 0.
>
> Have you tried this?
>
>
http://marc.info/?l=linux-kernel&m=119317981406073&w=2
> -
