Subject: port-i386/1416: vm-related panics when using caches on Pentium
To: None <>
From: Jason Thorpe <>
List: netbsd-bugs
Date: 08/28/1995 19:18:40
>Number:         1416
>Category:       port-i386
>Synopsis:       vm-related panics when using caches on Pentium
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    gnats-admin (GNATS administrator)
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Aug 28 22:20:03 1995
>Originator:     Jason Thorpe
Numerical Aerodynamic Simulation Project - NASA Ames
>Release:        -current, Aug 22 1995
System: NetBSD sticky 1.0A NetBSD 1.0A (STICKY) #1: Mon Aug 28 18:15:31 PDT 1995 thorpej@antie:/work/netbsd/src/sys/arch/i386/compile/STICKY i386

	When using the internal and external caches on a Pentium
	system (ASUS mainboard), I let the system run for a while and
	get vm-related panics.  I managed to get a stack trace of one of

	vmfault(f8275000, fc840000, 1, 0) -> 1
	kernel: page fault trap, code=0
	stopped at	_vm_object_copy: cmpl $0,0x28 (%ebx)


	syscall #2

	See above.  It's worth noting that running with the internal
	cache only produces "Data modified on free list" messages
	before the system wedges.

	Zero clue.  One thing's for sure, disabling all of the cache
	is _not_ the Right Thing.  It's ... slow.