Subject: Re: Processes getting stuck in disk wait on current currents
To: Chuck Silvers <>
From: Wolfgang Rupprecht <>
List: current-users
Date: 02/18/2001 19:46:43
Chuck Silvers writes:
> I just copied 500 MB from NFS to a local filesystem with "tar | (cd && tar)"
> on an x86 and it worked fine.

It doesn't seem to happen on my other 3 machines either, and they all
run the same fs code and mostly the same kernel.

> can you get a crashdump while some processes are hung in biowait?

I tried to initiate a "sync" from DDB and got a panic.  (transcribing
by hand) the panic was:

	syncing disks... 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 ... giving up
	dumping to dev 0,1 offset 153,331
	dump panic: wddump: polled command has been queued.
	stopped at cpu_debugger+0x4 leave

Hmm.  Seems like when this happens the disk is really OTL.

Wolfgang Rupprecht    <>
Coming soon: GPS mapping tools for Open Systems.