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Christos Zoulas wrote:
> On Apr 18,  1:38am, lguillaume@berklee.edu ("Louis  Guillaume") wrote:
> -- Subject: Re: `panic: lockmgr: no context' on 2.0.2 with network load
> 
> | Ok - Do I just compile a kernel with "options LOCKDEBUG"? I don't see 
> | any references to this in the GENERIC kernel.
> 
> Yes, that would do it.
> 
> | Also - Is there a way to get the backtrace from ddb (at panic-time) into 
> | a file somewhere?
> 
> t /l should work.
> 
> | On reboot, savecore just says "savecore: no core dump (invalid dumplo)".
> | 
> | Maybe I didn't make enough swap: I have 64MB RAM, 64MB swap.
> 
> I am not sure why; looks like a bug to me.
> 

I've installed a GENERIC kernel with `options LOCKDEBUG' added. The 
backtraces are much more verbose. But I can't grab them. They don't end 
up in the dmesg output and I get nothing from savecore.

Is there another way to get at those messages? Perhaps in single user 
before swap is configured?

What i did from ddb is...

t /l
continue

... it sync'd disks then rebooted.

This seems to be a serious problem, should I be filing a PR once I get a 
reasonable backtrace?

BTW - It looks like this is definitely happening with ftp processes 
only. IPFilter (ipnat) has its basic ftp proxy rules installed, i.e...

map ae0 192.168.1.0/24 -> 0/32 proxy port ftp ftp/tcp

... I don't know if that could be something, but there it is.

Thanks for helping,

Louis





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