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Old 11-28-2004, 06:55 AM   #1
rbirmann
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Registered: Aug 2004
Location: São Paulo, Brazil
Distribution: Debian
Posts: 12

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Kernel Panic


Let me go straight to th point:

I woke up today and switched on my monitor (I leave my computer on 24hs/day) and had nothing but a tty-like screen with something like this (the transcription my not be accurate......the computer was completely locked and there was nothing i could do besides pushing the reset button, so I copied most of it to a piece of paper and am copying it again in here):

Quote:
=================
[<c011acff>] profile_tick+0x5f/0x70
[<c0113c30>] do_page_fault+0x0/0x599
[<c0104388>] common_interrupt+0x18/0x20
[<c0113c30>] do_page_fault+0x0/0x599
[<c0104bf3>] die+0x113/0x190
[<c011964d>] vprintk+0x10d/0x170
[<c0113c30>] do_page_fault+0x0/0x599
[<c0119537>] printk+0x17/0x20
[<c0113e5e>] do_page_fault+0x22e/0x599
=================
Unable to handle kernel paging request of virtual address 6ba68bd5
printing eip:
c01046d9
*pde=00000000
Recursive die() failure, output supressed
<0> Kernel panic - not syncing: Fatal exception in interrupt
I have recently compiled kernel 2.6.9 and am using ReiserFS so I think the all those things about "pages" are related to the Reiser paging system.

My CPU (amd athlon 3000) is really hard to keep cool; I have already three cooler installed in my box and have removed the side of the box, but still, when I rebooted it after the lockdown the CPU temperate was 68.5C / 155F.

I really think this is the reason of the kernel exception, but thought i should post just in case it is not.

any thoughts??

ricardo birmann
 
Old 11-28-2004, 07:23 AM   #2
rjlee
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Registered: Jul 2004
Distribution: Ubuntu 7.04
Posts: 1,994

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The paging refers to the virtual memory system. Basically, a kernel module has requested an address from a virtual page in user-space that isn't mapped to a physical memory page or a page of your swap file.

(We know it's a kernel module because if it was a userspace program, it would SIGSEGV and that would be that; sadly, the kernel tends to die when problems happen).

The most common cause of errors like this (aside from programmer error, i.e. bugs) is when a memory location in RAM or on the CPU decides to flip a bit of a memory pointer, making it point to an invalid address.

This can happen because of a number of reasons, including overheating a CPU register, so your hypothesis is probably correct.
 
Old 11-28-2004, 09:09 AM   #3
rbirmann
LQ Newbie
 
Registered: Aug 2004
Location: São Paulo, Brazil
Distribution: Debian
Posts: 12

Original Poster
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Quote:
This can happen because of a number of reasons, including overheating a CPU register, so your hypothesis is probably correct.
yes, I think it is....

I was recompiling my kernel and, for each time i tried to run make I got an error on a different function... (during compilation cpu time goes as high as 100%)

I think the REAL problem is the brazilian summer (I live in Sao Paulo) that is just started; the air temperature is around 32C during the day.... I will just have to buy a better cooler,

thanks for your repĺy,

ricardo
 
Old 11-28-2004, 09:16 AM   #4
rjlee
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Registered: Jul 2004
Distribution: Ubuntu 7.04
Posts: 1,994

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Random errors during compilation that are not repeatable are often caused by this same fault, because gcc uses lots of pointers internally. (One problem is the amount of cheap audio-grade memory floating around inside computers, which was never tested to hold exact numbers).

An interesting RAM test is to take a complex project (like GCC) and try and compile it; if it gets all the way through in one go then your RAM is probably OK. Overheating (or worse, overclocking) still tends to make problems appear, though.
 
  


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