Strange behaviour

Kris Kennaway kris at
Wed Jan 21 10:43:13 PST 2004

On Wed, Jan 21, 2004 at 01:39:59PM -0500, Ken Smith wrote:

> I have the same machine (Dell 2650) and it's getting locked up in
> a very similar way, you don't need to get NFS involved to have
> processes get locked uup in getblk.  I'm slowly trying to remove
> variables but so far it seems like network activity of some sort
> helps cause the lockup.  The easiest way to make it lock up was
> doing backups through the network.  But find's cranked up by the
> nightly cron jobs can get locked in getblk as well (while there
> are no NFS partitions mounted, but things like cvsup updates of
> a local repo are happening).  Once things start to get locked up
> like this the system slowly degrades.  I can usually ssh in and
> reboot it if I catch it soon enough, if I leave it for a couple
> of days it will seem like it's up (rwhod is running) but ssh-ing
> in won't work.
> sledge (amd64 machine in the cluster) was showing similar symptoms
> this morning, it had failed doing its nightly rebuild/reboot and
> things like mtree commands were wedged since a day or two ago.
> The Dell I have here is not really in production at all, if me
> doing anything here will help I'm game...

OK, sounds like it might be something to do with vnode locking.
Turning on DEBUG_VFS_LOCKS might help to find it.

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