linux-kernel - Re: XFS/md/blkdev warning (was Re: Linux 2.6.26-rc2)

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Date:	Sat, 17 May 2008 11:41:20 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Alistair John Strachan <alistair@...zero.co.uk>
cc:	Jens Axboe <jens.axboe@...cle.com>, xfs@....sgi.com,
	Neil Brown <neilb@...e.de>, Nick Piggin <npiggin@...e.de>,
	linux-kernel@...r.kernel.org
Subject: Re: XFS/md/blkdev warning (was Re: Linux 2.6.26-rc2)



On Sat, 17 May 2008, Linus Torvalds wrote:
> 
> 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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