Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!mips!apple!lsr@Apple.com
From: lsr@Apple.com (Larry Rosenstein)
Newsgroups: comp.sys.mac.system
Subject: Re: 7.0b4 bugs was( Re The NEW desktop)
Message-ID: <13046@goofy.Apple.COM>
Date: 13 Apr 91 01:56:17 GMT
References: <1991Mar26.210153.8372@umiami.ir.miami.edu> <50865@apple.Apple.COM> <1991Apr11.082548.28796@lth.se>
Sender: usenet@Apple.COM
Organization: Apple Computer, Inc.
Lines: 11

In article <1991Apr11.082548.28796@lth.se>, sund@tde.lth.se (Lars Sundstr|m) writes:
> 
> This is probably not VM's fault. Inits and applications that have code
> executed at interrupt time must prevent the memory pages containing that
> code from being swapped by locking it. If they don't, a page fault may
> arise within a page fault. 

See Tech Note 285.  The System Heap is held in physical memory, so INITs that
only use the System Heap will work.  If they allocate other memory that might
be needed at interrupt time then they will have to be revised to hold that
range of addresses in physical memory.