Giant deadlock related to twe

[Doug White]

On Mon, 23 Aug 2004, Vinod Kashyap wrote:

> > Just got this on my amd64 box. A disk flaked out in my
> > machine, which has
> > a 3ware 8006-2LP with 2 80GB drives in a RAID0.  My X session
> > locked up
> > and was able to break to ddb.  Some ddb twiddling follows.
> > It looks like,
> > at first glance, some sort of deadlock against softupdates.
> >
> > twed0: drive timeouttwed0: drive timeouttwed0: drive
> > timeouttwed0: drive
> > timeout
> > twed0: drive timeouttwed0: drive timeouttwed0: drive timeouttwe0: AEN:
> > <twe0: drive timeout for unknown unit 1>
> > twed0: controller error - device failure (flags = 0x80)
> > twed0: controller error - device failure (flags = 0x80)
> > twed0: controller error - device failure (flags = 0x80)
> > twed0: controller error - device failure (flags = 0x80)
>
> The messages indicate timeouts due to the drive continuously returning
> BUSY to the firmware on the controller.  This could be caused by the
> the drive going bad, or even a one time disturbance like tugging of
> cables, etc.

Right, and a failing drive it was, but it shouldn't lock up the entire
system when it happens.

-- 
Doug White                    |  FreeBSD: The Power to Serve
dwhite at gumbysoft.com          |  www.FreeBSD.org