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> Null pointer dereference
bentobox
post May 3 2006, 07:05 PM
Post #1


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OK, I'm a noob. Inherited some Linux systems from my predecessor, one of which is an FTP server. It is now crashing every couple of days. I have no clue as to where to find what is wrong...

Linux version 2.2.14-5.0smp (root@porky.devel.redhat.com) (gcc version egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)

nothing shows up in /var/log/messages.

I took a photo of the console screen and it had:

scsi0 channel 0 target 0 lun 0 request sense failed, performing reset
SCSI bus is being reset for host 0 channel 0.
Unable to handle kernel NULL pointer dereference at virtual address 00000110
current->tss.cr3 = 00101000, %cr3 = 00101000
*pde = 00000000
ooops: 0002
CPU 0
EIP 0010:[<d000a61a>]
EFLAGS: 00010002
eax: cf856878 ebx: cf856878 ecx: 00000001 edx: 00000086
esi: 00000000 edi: 00000093 ebp: 00000003 esp: c0247eb8
ds: 0018 es: 0018 ss: 0018
Process swapper (pid: 0, process nr: 0, stackpage=c0247000)
Stack: cf856000 cf838000 00000000 00000001 cff1fbc0 c01bc313 cf838000 00000001
00000000 cf838000 000007d0 00000000 00000001 c01bbc23 cf838000 00000001
c0206320 00000000 00000000 00000000 00000000 cf856078 04000001 00000001
Call Trace: [<c01bc313>] [<c01bbc23>] [<c0206320>] [<d000e9e3>] [<d000ecd0>] [<c010b500>]
[<c0110205>] [<c010b66d>] [<c010a6b0>] [<c010794d>] [<c0106000>] [<c01001ae>]
Code: c7 86 10 01 00 00 00 00 00 00 56 8b 86 e4 00 00 00 ff d0 83
Aiee, killing interrupt handler
Kernel panic: Attempted to kill the idle task!
In swapper task - not syncing

TIA
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Robert83
post May 4 2006, 09:57 AM
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Hi,

something with the SCSI controller might be problematic or the Disk itself, if you can maybe you should switch the SCSI controller to some new same brand and if it goes away, that was the problem.

Sincerely
Robert B


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DS2K3
post May 4 2006, 10:09 AM
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That used to happen to me when I had a faulty memory module. It is proabbly easiest to recompile/upgrade the kernel first though (Get the newest version you can) since it might be abug that's been fixed in a newer release.


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bentobox
post May 4 2006, 11:20 AM
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Thanks for the suggestions. As this is a crucial production system for me I'll just start working through one thing at a time as I find more clues.
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