experiences with SunOS4.0.1

[Kim Kempf]

We've noticed that the problem with tty xon/xoff flow control being
disabled when a tty is closed is still there.  Tty spoolers must have an
open() hanging on the port or the flow control is gone when the last job
is printed.  Also various "bus error" panics related to tar -f /dev/rst8
seem to occur quite regularly now and didn't before.  Nothing for sure has
been determined yet, but a certain tar dump that we regularly have to do
will panic as follows:

vmunix: tar: 
vmunix: trap address 0x8, pid 6679, pc = f06f7e4, sr = 2204, stkfmt b, context 6
vmunix: Bus Error Reg 20<TIMEOUT>
vmunix: data fault address 11131113 faultc 0 faultb 0 dfault 1 rw 1 size 0 fcode 5
vmunix: KERNEL MODE
vmunix: page map 20000000 pmgrp ff
vmunix: D0-D7  2000 2200 5 0 0 f0b9ef8 2000 f0b9ef8
vmunix: A0-A7  11131113 0 f09f59a f09f56e f0b9f48 f0b9f60 ffff9630 ffff9610
vmunix: Begin traceback...fp = ffff9630, sp = ffff9610
vmunix: Called from f06f652, fp=ffff9654, args=f0b9f60 2000 0 0
vmunix: Called from f06ed86, fp=ffff9688, args=1208 0 0 2000
vmunix: Called from f06f200, fp=ffff96b0, args=1208 3 0 0
vmunix: Called from f042322, fp=ffff96d8, args=1208 3 ffff96d4 3
vmunix: Called from f039f76, fp=ffff973c, args=ffff9738 3 f1f5f44 0
vmunix: Called from f038dcc, fp=ffff9768, args=efffc79 0 603 1a4
vmunix: Called from f038d4a, fp=ffff9780, args=efffc79 603 1b6 ffff97b4
vmunix: Called from f064614, fp=ffff97a8, args=ffff9a18 efffc3c 0 0
vmunix: Called from f004768, fp=efffbf8, args=5 2 2d 5
vmunix: End traceback...
vmunix: panic: Bus error
vmunix: syncing file systems... [2] [2] done
vmunix: 
vmunix: dumping to vp f0f7ba8, offset 37096
vmunix: 1534 total pages, dump succeeded
vmunix: rebooting...
vmunix: SunOS Release 4.0 (MCRWARE) #8: Tue Dec 6 19:25:25 CST 1988