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From: robert@hslrswi.UUCP
Newsgroups: comp.bugs.4bsd
Subject: 4.3BSD DEQUNA Driver Panics MicroVax
Message-ID: <433@hslrswi.UUCP>
Date: Mon, 9-Mar-87 04:41:12 EST
Article-I.D.: hslrswi.433
Posted: Mon Mar  9 04:41:12 1987
Date-Received: Thu, 12-Mar-87 23:43:54 EST
Organization: Hasler AG, Berne, Switzerland
Lines: 43
Keywords: 4.3 BSD DEQUNA panic MicroVax


Index:	 /sys/vaxif/if_qe.c 4.3BSD

Description:
	The 4.3 BSD diver for the DEQUNA contains a bug that causes the
	MicroVax to panic with a "Protection fault" as soon as one
	does an "ifconfig qe0 <flags> <address>".

	The problem here is that, inside qerestart(), the driver requires
	the `addr' field of the `qe_softc' structure to be set before an
	ioctl( ..., SIOCSIFFLAGS, ... ) is done. This field is set inside
	qeinit() when an ioctl( ..., SIOCSIFADDR, ... ) is called.
	Unfortunately, ifconfig calls the ioctl's in the opposite order -
	that is, SIOCSIFFLAGS before SIOCSIFADDR - regardless of the order
	of the command flags.

Repeat-By:
	Bring up 4.3BSD on a MicroVax. Type something like:

	ifconfig qe0 myaddress broadcast ... trailers up

	Watch as your MicroVax immediately blows up with a
	"Panic: protection fault"

Fix:
	I haven't got a fix for this but here is a ...

Work-Around:
	Split the ifconfig command into two parts. Thus:

	ifconfig qe0 myaddress
	ifconfig qe0 broadcast ... trailers up


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    J. Robert Ward,						   ___________
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