More odd behavior with the new PCI code (and, maybe, ata)

Niels Chr. Bank-Pedersen ncbp at
Wed Apr 14 14:49:46 PDT 2004

On Wed, Apr 14, 2004 at 01:26:54PM -0700, Kevin Oberman wrote:
> I have noticed a very odd behavior since the new PCI code went into
> CVS. I have virtually no real data on the problem and no idea if it's
> really serious. It's only happened three time, always in single-user
> mode. 
> 1. boot -s
> 2. <CR> to start sh
> 3. fsck -p
> 4. adjkerntz -i
> 5. swapon -a
> 6. mount -a -t ufs
> 7. cd /usr/src
> These are the only things I am sure of as common. After this, an attempt
> to run something will simply hang. In mergemaster I had it happen when I
> tried to do an edit (e b) in a merge. Another time 'make installworld'
> hung in 'mktemp'. Interrupting the operation (^C) and restarting does
> not seem to help, but doing some other operation that accesses the disk
> seems to clear the problem. (E.g. ls /usr/src).
> Once cleared, the problem never seems to recur. I have not seen it in
> multi-user mode. I can't imagine what could be causing it, but loss of
> interrupts from the ata MIGHT explain it.
> Any suggestions on where to look?

Sounds like blocking on random(3).

> /tmp is on real disk, not RAM. (I've seen reports of problems with
> md's elsewhere.) 
> This is probably not enough information to be useful, but I'll try to
> collect more information when/if I see it again. I am hoping to find out
> if it's just me or a more common issue.
> -- 
> R. Kevin Oberman, Network Engineer
> Energy Sciences Network (ESnet)
> Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
> E-mail: oberman at			Phone: +1 510 486-8634
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/Niels Chr.

 Niels Christian Bank-Pedersen, NCB1-RIPE.
 Network Manager, TDC, IP-section.

 "Hey, are any of you guys out there actually *using* RFC 2549?"

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