On Sat, 17 May 2008, Linus Torvalds wrote:
quoted text
> 
> Do this on the console (and having a serial console or working netconsole 
> is a wonderful thing to log it, because otherwise it will generally just 
> scroll off the screen), and trigger SysRQ-w. That dumps all blocked tasks 
> to the screen.

Another thing to try is to enable lock debugging, and have

	CONFIG_DEBUG_SPINLOCK=y
	CONFIG_DEBUG_MUTEXES=y
	CONFIG_DEBUG_LOCK_ALLOC=y
	CONFIG_PROVE_LOCKING=y
	CONFIG_LOCKDEP=y
	CONFIG_DEBUG_LOCKDEP=y

in your kernel .config file. It has performance implications, of course, 
but it can help debug incorrect locking much more quickly.

		Linus
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