Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uwm.edu!cs.utexas.edu!rutgers!mcdchg!ddsw1!karl
From: karl@ddsw1.MCS.COM (Karl Denninger)
Newsgroups: comp.unix.xenix
Subject: Re: Kernel panics and double panics
Summary: Try to do things that make it happen, then start removing drivers
Message-ID: <1989Dec28.182255.1778@ddsw1.MCS.COM>
Date: 28 Dec 89 18:22:55 GMT
References: <2599259F.31C0@marob.masa.com>
Reply-To: karl@mcs.MCS.COM (Karl Denninger)
Organization: Macro Computer Solutions, Inc. - Mundelein, IL
Lines: 37

In article <2599259F.31C0@marob.masa.com> daveh@marob.masa.com (Dave Hammond) writes:
>OS: Xenix 386, release 2.3.2, update R ("GT" upgrade kit)
>Hardware: Everex 25mhz 386, 6 MB 32 bit RAM
>Peripherals: 80387, ESDI drive, 60MB QIC tape, Arnet Smart-8 serial expander.
>
>The system boots and operates normally for a period of time, but will
>eventually panic with an error:
>
>	Kernel Panic - Non-recoverable Kernel Page Fault.
>
>The most recent panic (this morning) was followed by:
>
>	Kernel Double Panic - Stack Fault.
>
>The panics can occur hours or days apart, and (as yet) can not be
>attributed to any specific condition.  

Try running 80286 things, such as the 286 compiler.  That seems to provoke
it in some cases.

>The most obvious hint that the
>problem is surfacing is when an exec?() call causes a segmentation
>violation, without ever loading the program.  If the shell is attempting
>the exec?(), this results in a "Memory fault, core dumped" message and a
>return to the shell prompt.
>
>Advice as to remedial action, debugging procedures, etc is desparately
>sought!  E-mail is preferred, however, I read this newsgroup daily.

Try removing the Arnet support.  We had just such a problem and it
disappeared when we got rid of the Anvil board in our system!

--
Karl Denninger (karl@ddsw1.MCS.COM, <well-connected>!ddsw1!karl)
Public Access Data Line: [+1 708 566-8911], Voice: [+1 708 566-8910]
Macro Computer Solutions, Inc.		"Quality Solutions at a Fair Price"