kern/104406: [ufs] Processes get stuck in "ufs" stateunderpersistent CPU load

Oleg Derevenetz oleg at
Mon Nov 5 02:07:49 PST 2007

> Anyway, I looked at the ddb output already, said that it looks as either
> driver or hw problem with very high confidence.
> I think the time of the project could be spent more productive elsewere,
> while submitter checks his hardware, for instance, by changing controller,
> disks, or controller type.

I already said that:

1. This controller and disks succesfully works earlier with FreeBSD 4.6.2 
without any problems;
2. I tried to replace a disk with another one (the same model), but it 
doesn't help. Unfortunately, I have no another free SCSI controller (but see 
3. I have another AMD64 machine with different hardware (including disks and 
SCSI controller) that periodically suffers from the same problem. 
Unfortunately, that machine is in production and heavily loaded, so I can't 
overload it even more with INVARIANTS, WITNESS, and DIAGNOSTIC - my clients 
will not forgive me for that.

Oleg Derevenetz <oleg at> OOD3-RIPE
Phone: +7 4732 539880
Fax:   +7 4732 531415
CenterTelecom Voronezh ISP

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