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Date: Sat, 17 May 2008 11:37:35 -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, Alistair John Strachan wrote: > > My guess is that when the kernel runs out of MemFree and starts reclaiming the > cache, something is deadlocking somewhere. Just doing a: > > cat /dev/zero >/path/to/file 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. You may need to do echo 1 > /proc/sys/kernel/sysrq before that to enable it. (Or if you have some things still running because they haevn't hit the lock that causes the deadlock, you can try echo w > /proc/sysrq-trigger rather than the key combination). Linus -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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