Kernel bug

Kernel bug

[Tomas Jura]

Hi, everybody

I probably hit some kernel bug, which apply to load
accounting and/or task creation.  This happens me three
times this week.  Can somebody help me to prepare trap for
it and find what has happens ? I'm not kernel guru and not
very familiar with ppc assembler.

Thanks.
Tomas

Hardware, Software and Symptoms:

HW: PPC G3 beige, 160 MB of memory, (CONFIG_HIGHMEM off)
SW: Debian 2.2 unstable, kernel 2.2.5-pre1 (gcc 2.95.4)
Do kernel debug options included ( sysmon,....)
Also happened with kernel 2.2.4-x.
Loaded machine (>1)( running package instalation or
compilation). Then dies a wmtop (Window Maker top). It is not
suid program. In this moment apperars in syslog

Oops: kernel access of bad area, sig: 11
NIP: C0058B90 XER: 00000000 LR:
C00563A8 SP: C87C7D50 REGS: c87c7ca0 TRAP: 0300
MSR: 00009032 EE: 1 PR: 0 FP: 0
ME: 1 IR/DR: 11
DAR: 00000004, DSISR: 40000000
TASK = c87c6000[18224] 'wmtop'
Last syscall: 3
.......
than any attempt of process listing fails (never finish
and stay hooked) and every time there is three proceses at the
end of listnig:

24459 ?        S      0:00 /USR/SBIN/CRON
24460 ?        S      0:00 /bin/sh -c   if [ -x /usr/sbin/exim -a -f /etc/exim/exim.conf ]; then /usr/s
24461 ?        S      0:00 /usr/sbin/exim -q
<end of list, frozen forever>

Yes, exim mailer is suid ;-(

Load measurement is still possible but, shows number of
frozen processes.
Any ideas where is a mistake or how to solve it?

Just happen again. Going to reboot....

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Re: Kernel bug

[Olaf Hering]

On Sun, May 13, Tomas Jura wrote:

> HW: PPC G3 beige, 160 MB of memory, (CONFIG_HIGHMEM off)
> SW: Debian 2.2 unstable, kernel 2.2.5-pre1 (gcc 2.95.4)

> Any ideas where is a mistake or how to solve it?

Get the linux-2.2.19.tar.bz2 from your local kernel.org mirror.
2.2.5 is pretty old or the second two is a typo ;)


Gruss Olaf

--
 $ man clone

BUGS
       Main feature not yet implemented...

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Re: Kernel bug

[Tomas Jura]

On Sun, May 13, 2001 at 07:12:35PM +0200, Olaf Hering wrote:
>
> On Sun, May 13, Tomas Jura wrote:
>
> > HW: PPC G3 beige, 160 MB of memory, (CONFIG_HIGHMEM off)
> > SW: Debian 2.2 unstable, kernel 2.2.5-pre1 (gcc 2.95.4)
>
> > Any ideas where is a mistake or how to solve it?
>
> Get the linux-2.2.19.tar.bz2 from your local kernel.org mirror.
> 2.2.5 is pretty old or the second two is a typo ;)
>
I'm sorry typo... correction: 2.4.5-pre1 and 2.4.4-x

One other thing which possibly can be a villain:
With RAM I added extra video memory so total size is now 6MB. But
dmesg shows:
atyfb: 3D RAGE PRO (PQFP, PCI) [0x4750 rev 0x7c] 4M SGRAM,
                                                 ^^^^^^^^
Tomas

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Re: Kernel bug

[Olaf Hering]

On Sun, May 13, Tomas Jura wrote:

>
> On Sun, May 13, 2001 at 07:12:35PM +0200, Olaf Hering wrote:
> >
> > On Sun, May 13, Tomas Jura wrote:
> >
> > > HW: PPC G3 beige, 160 MB of memory, (CONFIG_HIGHMEM off)
> > > SW: Debian 2.2 unstable, kernel 2.2.5-pre1 (gcc 2.95.4)
> >
> > > Any ideas where is a mistake or how to solve it?
> >
> > Get the linux-2.2.19.tar.bz2 from your local kernel.org mirror.
> > 2.2.5 is pretty old or the second two is a typo ;)
> >
> I'm sorry typo... correction: 2.4.5-pre1 and 2.4.4-x
>
> One other thing which possibly can be a villain:
> With RAM I added extra video memory so total size is now 6MB. But
> dmesg shows:
> atyfb: 3D RAGE PRO (PQFP, PCI) [0x4750 rev 0x7c] 4M SGRAM,


Have a look at this text file:
http://penguinppc.org/~olaf/reporting_kernel_issues.txt

Does this show up in the OF tree? Some models have a memory* property in
/proc/device-tree/pci\@80000000/ATY,mach64*

But it seems that Mach64 ressource handling is currently a bit broken.



Gruss Olaf

--
 $ man clone

BUGS
       Main feature not yet implemented...

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