Panic output

Panic output

[simon]

During writing a driver for a PCI board I experienced the hardware 
hanging and I had to press the big red button. The hang was traced 
using a PCI analyzer and I found that the driver, loaded as a 
module, was taking a route which called panic. I changed 
/proc/sys/kernel/panic to a non zero value and the machine started 
to reboot on PCI hang. My problem is I never see any output on the 
screen or in /var/log/messages. All the stuff I have looked at in 
/usr/src/linux/Documentation suggests the messages should be 
here. I am running a 2.4.0 kernel with a SuSE 7.1 installation. At 
the hang time the system is running kde 2 and in a command 
winow I have a tail -f /var/log/messages running. The first change I 
see is the PC bios startup. 

Please Help

Simon.
__________________________

Simon Haynes - Baydel 
Phone : 44 (0) 1372 378811
Email : simon@baydel.com
__________________________

Re: Panic output

[Peter Wächtler]

simon@baydel.com schrieb:
> 
> During writing a driver for a PCI board I experienced the hardware
> hanging and I had to press the big red button. The hang was traced
> using a PCI analyzer and I found that the driver, loaded as a
> module, was taking a route which called panic. I changed
> /proc/sys/kernel/panic to a non zero value and the machine started
> to reboot on PCI hang. My problem is I never see any output on the
> screen or in /var/log/messages. All the stuff I have looked at in
> /usr/src/linux/Documentation suggests the messages should be
> here. I am running a 2.4.0 kernel with a SuSE 7.1 installation. At
> the hang time the system is running kde 2 and in a command
> winow I have a tail -f /var/log/messages running. The first change I
> see is the PC bios startup.
> 

First: try to start your driver from the console.
There you should see the panic message.

Then look at Documentation/serial-console.txt and hook up a serial 
console to your box

Re: Panic output

[simon]

I have tried the console only method and this does not work either. 
Perhaps I sould add some more information about the panic. This 
card is a FC board and there was a bug in the hardware which 
caused invalid frame reception. When this happens the driver is 
interrupted and goes off to have a look at the frame. It sorts ou the 
hardware and continues. Initially I was just dumping part of the 
frame and the system continued and all was ok. I decided in 
certain circumstances this would not be a good idea so I inserted 
the panic. At this stage I get the hang or reboot depending how I 
set /proc/sys/kernel/panic. I guess if this is set to 0 the hang 
should be a screen oops message ?

I get the impression from the responses that panic does not aways 
work, is that correct ?

At this point the hardware is all ok and can be made to continue 
running all that has happened is some isolated event internal to a 
PCI card.

I will try the serial line.

Many Thanks

Simon. 


On 17 Dec 2001, at 14:57, Peter Wächtler wrote:

> simon@baydel.com schrieb:
> > 
> > During writing a driver for a PCI board I experienced the hardware
> > hanging and I had to press the big red button. The hang was traced
> > using a PCI analyzer and I found that the driver, loaded as a
> > module, was taking a route which called panic. I changed
> > /proc/sys/kernel/panic to a non zero value and the machine started
> > to reboot on PCI hang. My problem is I never see any output on the
> > screen or in /var/log/messages. All the stuff I have looked at in
> > /usr/src/linux/Documentation suggests the messages should be
> > here. I am running a 2.4.0 kernel with a SuSE 7.1 installation. At
> > the hang time the system is running kde 2 and in a command
> > winow I have a tail -f /var/log/messages running. The first change I
> > see is the PC bios startup.
> > 
> 
> First: try to start your driver from the console.
> There you should see the panic message.
> 
> Then look at Documentation/serial-console.txt and hook up a serial 
> console to your box


__________________________

Simon Haynes - Baydel 
Phone : 44 (0) 1372 378811
Email : simon@baydel.com
__________________________

Re: Panic output

[willy tarreau]

Hello !

You may also try kmsgdump which will try to catch the
panic,
dump it to an interactive (blue) screen and let you
read all your
messages, and print them or dump them on a floppy
disk.

depending on the nature of the panic, it cannot always
do
something usefull, but generally it works.

http://wtarreau.free.fr/kmsgdump/0.4.3/

Regards,
Willy


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