Re: [9fans] GUI toolkit for Plan 9

[Martin C.Atkins <martin@mca-ltd.com>]

Thanks Nigel,

On Mon, 4 Mar 2002 14:02:41 0000 nigel@9fs.org wrote:
> du -a . | grep ...

Great hack! Thanks also to the other who pointed this out.

> 
> panic iunlock can be caused by two things:
> 
> 	if(l->key == 0)
> 		print("iunlock: not locked: pc %luX\n", getcallerpc(&l));
> 	if(!l->isilock)
> 		print("iunlock of lock: pc %lux, held by %lux\n", getcallerpc(&l), l->pc);
> 

Actually I don't remember a pc - is this because it happened before Plan9 proper
got going? I.e. long before the "root is from..." question. (Possibly at about
the "using sdC0!..." line), but I don't remember for sure. As I remember the message
was simply:
	panic iunlock

I suppose the real fustration was that there didn't seem to be anything I could
do about it, short of re-installing from scratch (and having the installer
screw up my partition table - again!)

> i.e. iunlocking something not locked at all, or iunlocking something
> that was locked.
> 
> lock = spin lock
> ilock = disable interrupts and spin lock
> 
> the real interest is the pc printed out, because it tells you where the iunlock()
> was called from. You can consult the kernel image to find out where this
> is.
> 
> 

Anyway, like I said... It's working great now!

Martin
-- 
Martin C. Atkins	martin@mca-ltd.com
Mission Critical Applications Ltd, U.K.