Subject: Re: Processes getting stuck in disk wait on current currents
To: Chuck Silvers <email@example.com>
From: Wolfgang Rupprecht <firstname.lastname@example.org>
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 <email@example.com> http://www.wsrcc.com/wolfgang/
Coming soon: GPS mapping tools for Open Systems. http://www.gnomad-mapping.com/