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SubjectRe: NULL pointer dereference with pre 2.1.37-4
On Sun, 4 May 1997, Thorsten Kukuk wrote:

>
> Hello,
>
> With pre 2.1.37-3 and 2.1.37-4, I get the following Oops when
> starting init:
>
> Unable to handle kernel NULL pointer dereference at virtual address 00000000
> current->tss.cr3 = 00101000,%cr3=00101000
> *pde=00000000
> Oops: 0002
> CPU: 0
> EIP: 0010:[<c01d8ef0>]
> EFLAGS: 00010247
> eax: 00000000 ebx: 00004000 ecx: 00000000 edx: 00000001
> esi: c0107f60 edi: c01da4f2 ebp: c0005fdc esp: c0005fac
> ds: 0018 es: 0018 ss: 0018
> Process swapper (pid:0, process nr:1, stackpage=c0097000)
> Stack: 00001100 c0107f60 c01da4f2 00000001 c0107f60 00000001 00000000 00000005
> 00000018 00000018 ffffffff c0108440 00000e00 c0108519 00001100 c02137b0
> 00000000 c021380f 00000000 c02137a4 00000001
> Call Trace:
> Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>
> ksymoops:
> Using `/src/Linux/linux-2.1/System.map' to map addresses to symbols.
>
> >>EIP: c01d8ef0 <dst_access_fault+1a9/2c16>
>
> Code: c01d8ef0 <dst_access_fault+1a9/2c16>
>
>
> I have a Tyan Tomcat III Board with 2 Pentium 133Mhz Processors. The kernel
> is compiled with gcc 2.7.2.2.
>
> Thorsten
>
> --
> Thorsten Kukuk kukuk@vt.uni-paderborn.de
> http://www-vt.uni-paderborn.de/~kukuk

You have the same fault I do with SMP enabled and 2 Pentium 166MHz
processors. I also have the same board. I am using the aic7xxx SCSI
driver. Basically, the first time a spinwait for IRQ completion occurs,
the code executed is not as expected, i.e., zeros or whatever was in
memory at the EIP: address.

You never got to execute init. I hope Linus is reading this stuff. Actually
I hope he is fixing it!!


Cheers,
Dick Johnson
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Richard B. Johnson
Project Engineer
Analogic Corporation
Voice : (508) 977-3000 ext. 3754
Fax : (508) 532-6097
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