On Fri, Aug 01, 2003 at 02:44:55PM -0700, Andrew Morton wrote:
> Diffie <diffie@blazebox.homeip.net> wrote:
> >
> > Unable to handle kernel NULL pointer dereference at virtual address 00000120
> > printing eip:
> > c02a8cae
> > *pde = 00000000
> > Oops: 0000 [#1]
> > PREEMPT
> > CPU:    0
> > EIP:    0060:[<c02a8cae>]    Not tainted VLI
> > EFLAGS: 00210286
> > EIP is at aic7xxx_proc_info+0x2e/0xc80
> > eax: c1bb25b0   ebx: c1bb2400   ecx: c038bb20   edx: 00000000
> > esi: 00000400   edi: f1715000   ebp: 412de000   esp: f620fecc
> > ds: 007b   es: 007b   ss: 0068
> > Process nautilus (pid: 3555, threadinfo=f620e000 task=f6216720)
> > Stack: 000001f7 00000000 00000000 c013c612 c0379eb0 00000000 00000000 f6613340
> >        00000000 00000000 c0379eb0 00000400 00000400 f1715000 412de000 c02956fc
> >        c1bb2400 f1715000 f620ff60 00000000 00000400 00000000 c02956c0 c018bc91
> > Call Trace:
> > [<c013c612>] __alloc_pages+0x92/0x320
> > [<c02956fc>] proc_scsi_read+0x3c/0x60
> > [<c02956c0>] proc_scsi_read+0x0/0x60
> 
> This patch should fix the oops.
> 
> As for why the proc reading code was unable to locate the HBA: dunno, but
> this is a first step.
> 
> Or maybe you don't have any adaptec controllers in the machine?
> 
> (jejb, please apply..)
> 
> 
>  25-akpm/drivers/scsi/aic7xxx_old/aic7xxx_proc.c |    2 +-
>  1 files changed, 1 insertion(+), 1 deletion(-)
> 
> diff -puN drivers/scsi/aic7xxx_old/aic7xxx_proc.c~aic7xxx_old-oops-fix drivers/scsi/aic7xxx_old/aic7xxx_proc.c
> --- 25/drivers/scsi/aic7xxx_old/aic7xxx_proc.c~aic7xxx_old-oops-fix	Fri Aug  1 14:41:14 2003
> +++ 25-akpm/drivers/scsi/aic7xxx_old/aic7xxx_proc.c	Fri Aug  1 14:41:20 2003
> @@ -92,7 +92,7 @@ aic7xxx_proc_info ( struct Scsi_Host *HB
>  
>    HBAptr = NULL;
>  
> -  for(p=first_aic7xxx; p->host != HBAptr; p=p->next)
> +  for(p=first_aic7xxx; p && p->host != HBAptr; p=p->next)
>      ;
>  
>    if (!p)
> 
> _
> 
> 

Andrew,

After applaying the above patch and testing it still oopses the kernel.

I noticed same patch in today's mm3 which i compiled and use right now.

When using cat /proc/scsi/aic7xxx/0 i get segmentation fault and oops
which i'll attach to this email.

uname: Linux blaze 2.6.0-test2-mm3 #1 Sat Aug 2 20:12:35 EDT 2003 i686 unknown

gcc version 3.2.2 on Slackware 9.0

I noticed this when the SCSI sybsystem is initialized upon boot:
scsi: Device offlined - not ready after error recovery: host 0 channel 0 id 1 lun 0

Regards,

Paul B.