Re: Linux v2.6.17-rc5

[Linus Torvalds <torvalds@osdl.org>]

On Thu, 25 May 2006, Luiz Fernando N. Capitulino wrote:
> 
>  I'm getting this after running 'halt':
> 
> Halting system...
> md: stopping all md devices.
> md: md0 switched to read-only mode.
> Shutdown: hda
> System halted.
> BUG: halt/3367, lock held at task exit time!
>  [dfe70494] {mddev_find}
> .. held by:              halt: 3367 [decf4a90, 118]
> ... acquired at:               md_notify_reboot+0x31/0x7f

Sounds like this is due to df5b89b323b922f56650b4b4d7c41899b937cf19, aka 
"md: Convert reconfig_sem to reconfig_mutex" by NeilBrown.

Neil? It may well be (and likely is) an old thing, just exposed by the 
lock debugging of the new mutexes.

Was it _meant_ to take the lock and hold it? Looks like it might be the

	ITERATE_MDDEV(mddev,tmp)
		if (mddev_trylock(mddev))
			do_md_stop (mddev, 1);

(maybe it should release the lock after the md_stop?)

		Linus
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