From owner-freebsd-bugs  Tue Sep 28 23:40:13 1999
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Date: Wed, 29 Sep 1999 16:02:30 +0930 (CST)
From: "Daniel O'Connor" <doconnor@gsoft.com.au>
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Subject: kern/14033: Data acq process gets stuck in vmopar
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>Number:         14033
>Category:       kern
>Synopsis:       Data acq process gets stuck in vmopar
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Sep 28 23:40:01 PDT 1999
>Closed-Date:
>Last-Modified:
>Originator:     Daniel O'Connor
>Release:        FreeBSD 3.3-RELEASE i386
>Organization:
Genesis Software
>Environment:

3.2, 3.3-RC, 3.3-REL, and 3.3-STABLE. PII-350, 128meg of RAM.

>Description:

We have a PCI data acquisition card which effectivly maps a FIFO into memory
and the kernel reads it during interrupt, and passes the data off to a userland
process in read().

Occasionally (happens much more often when the system is loaded, ie buildworld,
and doing networking) the process reading from the card gets stuck in vmopar. 

I looked in the archives and there was a suggestion that it was NFS related so
I umount'd the NFS partitions but no joy.

This problem does not occur in 2.2.8, and the driver code is almost identical,
(except poll) so I suspect the OS, but I do not know where to start looking.

>How-To-Repeat:

Rather complicated :(

>Fix:
	
Go back to 2.2.8+CAM (blerg)


>Release-Note:
>Audit-Trail:
>Unformatted:


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