Messages in this thread | | | Date | Sat, 17 May 2008 11:37:35 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: XFS/md/blkdev warning (was Re: Linux 2.6.26-rc2) |
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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
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