Re: how to capture kernel panics

[Jeff Moyer]

==> Regarding Re: how to capture kernel panics; "shabanip" <shabanip@xxxxxxxxxxxxxxxx> adds:

shabanip> thanks for the help.  does anything else left to configure?

On the log target system, you will probably want to run something similar
to netcat to capture the logs.  To simply output to a terminal, you could
do something like this:

nc -l -p 6666 -u

-Jeff

shabanip> Payam Shabanian shabanip -at- avapajoohesh.com


>> ==> Regarding Re: how to capture kernel panics; "shabanip"
>> <shabanip@xxxxxxxxxxxxxxxx> adds:
>> 
shabanip> as i see netconsole is a kernel module.  so i just need to load
shabanip> netconsole module with server:port parameters.  am i right?
>> MODULE_PARM_DESC(netconsole, "
>> netconsole=[src-port]@[src-ip]/[dev],[tgt-port]@<tgt-ip>/[tgt-macaddr]\n");
>> 
>> So, for example:
>> 
>> modprobe netconsole
>> netconsole=6666@xxxxxxxxxxx/eth0,6666@xxxxxxxxxxxxx/00:40:95:9A:12:34
>> 
>> -Jeff
>> 
>> 
shabanip> Payam Shabanian shabanip -at- avapajoohesh.com
>>
>>>> ==> Regarding Re: how to capture kernel panics; Christian Borntraeger
>>>> <linux-kernel@xxxxxxxxxxxxxxx> adds:
>>>> 
linux-kernel> shabanip wrote:
>>>>>> is there any way to capture and log kernel panics on disk or ...?
>>>>
linux-kernel> In former times, the Linux kernel tried to sync in the panic
linux-kernel> function. (If the panic did not happen in interrupt context)
linux-kernel> Unfortunately this had severe side effects in cases where
>>>> the
linux-kernel> panic was triggered by file system block device code or any
linux-kernel> other part which is necessary for syncing. In most cases the
linux-kernel> call trace never made it onto disk anyway. So currently the
linux-kernel> kernel does not support saving a panic.
>>>>
linux-kernel> Apart from using a serial console, you might have a look at
linux-kernel> several kexec/kdump/lkcd tools where people are working on
linux-kernel> being able to dump the memory of a paniced kernel.
>>>> Or netconsole, which will dump printk's do the server:port of your
>>>> choosing.
>>>> 
>>>> -Jeff
>>>> 
>>
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