ad8: TIMEOUT - WRITE_DMA errors UFS 7.0-RC1

Michael Haro mharo at
Sun Jan 27 00:30:07 PST 2008

On Jan 26, 2008 3:28 PM, Joe Peterson <joe at> wrote:
> Remco van Bekkum wrote:
> > Same here. On an amd64 system with 1x sata disk (Western Digital Caviar
> > Green Power) on an amd690G chipset, with UFS and intensive disk activity
> > the system hangs and in the end it may panic. I've csupped today and
> > rebuild world & generic kernel but still it's very unstable, sometimes it
> > even hangs when activating geom volumes at boot time...
> > I must add that this is a new system so I'm not 100% sure the hardware is sane.
> > Using ZFS it also crashed when doing intensive I/O.
> This is very interesting.  It seems to there are several of us who are
> experiencing something that *looks* like hardware (disk) issues when using 7.0.
> Could this be related to the mouse freeze issue?  Could some process be
> locking/grabbing the CPU at inopportune times and causing not only the
> freezing symptoms but also reads/writes problems?
> Can anyone else using 7.0 who hasn't already (especially those using ZFS)
> check his/her /var/log/messages for disk TIMEOUTs or other disk error
> messages?  If this is widespread, I think the chances re slim that it is a
> hardware problem in every case.

I've had this problem with Hitachi sata drives using a promise sata controller.

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