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From: brett@solar.card.inpu.oz.au (Brett Sealey)
Newsgroups: comp.protocols.tcp-ip
Subject: SLIP problems under SunOS 4.1.1
Keywords: SLIP Sun4 SPARC SunOS
Message-ID: <1991Apr12.060432.1266@solar.card.inpu.oz.au>
Date: 12 Apr 91 06:04:32 GMT
Organization: Telecom Australia
Lines: 30

Lately we have been playing with the "Beta SLIP for SunOS 4.0" written by
Rayan Zachariassen. We have been using it on Sun SPARCstation IPC's
running SunOS 4.1.1 (This may well be the problem).

Occasionally these machines crash with a "panic: mget" or even more rarely
a "panic: mfree" message.

Looking into the SLIP code I can see a MGET call within the tty_slip.c
file. MGET is a macro which can cause a "panic: mget" if the next mbuf on
the free list (mfree) is not correctly marked as "MT_FREE".

As I see it this is reasonable, the question is why does this condition
arise in the first place and, even more importantly, how can it be
prevented.

A comment in tty_slip.c indicates that :-
	/* (SLIP_CLUSTERS doesn't work under SunOS 4.0) */
Is this true under SunOS 4.1.1?

If anyone has any clues as to what could be causing this rather
embarassing problem I'd be very keen to hear from them.

Thanks (in advance :-)
       Brett Sealey
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 /__) /__) /_    /    /				brett@solar.card.inpu.oz.au
/__) / \  /__   /    /					       Brett Sealey
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