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Date: Sun, 20 Dec 1998 17:00:46 +0100
From: pascal@finesse (Pascal Gienger)
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To: FreeBSD-gnats-submit@FreeBSD.ORG
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Subject: kern/9143: Instabilities of 3.0-RELEASE due to syscons driver
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>Number:         9143
>Category:       kern
>Synopsis:       syscons of 3.0-RELEASE causes system to crash
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:
>Keywords:
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Dec 20 08:10:00 PST 1998
>Last-Modified:
>Originator:     Pascal Gienger
>Organization:
Factum Data Network Services, Konstanz
>Release:        FreeBSD 3.0-RELEASE i386
>Environment:

486DX2, 16 MB RAM, Tseng ET4000 based ISA video adapter.
sc driver (syscons) of 3.0-RELEASE.

>Description:

The sc driver may cause the kernel to panic when using multiple video
modes and/or XFree86.

>How-To-Repeat:

Simple: Type "vidcontrol VGA_80x30" on a virtual tty (you will get 30 lines
on your display). Start some applications. Try to switch back to a terminal
with the standard mode (25 lines). You will get a long beep and the system
crashes.

With X11: start X11 via xdm. Wait until xdm login screen appears. Log
in, start a memory intensive application (e.g. Netscape Communicator 4.5).
Try to switch back to a virtual syscons tty (CTRL-ALT-F1 for example).
A long beep, and the system crashes.

>Fix:
	
The problem went away when I upgraded the sc driver with the one of
3.0-CURRENT (current from 1998/12/18). You have to tweak a little bit because
 f the changed inthand2_t (ointhand2_t)-stuff of 3.0-CURRENT.


>Audit-Trail:
>Unformatted:

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