Subject: page fault in supervisor mode
To: None <>
From: Felix A. Croes <>
List: netbsd-bugs
Date: 11/20/1994 16:07:09
   [a copy of my posting to comp.os.386bsd.bugs]

   My system (NetBSD 1.0) rebooted with a page fault in supervisor mode.  No
core dump was generated.  I don't know if it is related, but previously, while
debugging, I noticed that gdb behaved badly.  In such innocent commands as
backtrace, sometimes a bad memory address would be accessed, and sometimes
the stated error would be "No such process."  Repeating the same command
would often succeed without any errors.
   My system configuration is given below (16 Mb swap).

   Felix Croes

Nov 20 15:14:04 pattern /netbsd: NetBSD 1.0 (PATTERN) #3: Thu Nov 10 15:09:18 ME
T 1994
Nov 20 15:14:04 pattern /netbsd:     root@pattern:/usr/src/sys/arch/i386/compile
Nov 20 15:14:04 pattern /netbsd: CPU: i486DX (486-class CPU)
Nov 20 15:14:04 pattern /netbsd: real mem  = 8257536
Nov 20 15:14:04 pattern /netbsd: avail mem = 6991872
Nov 20 15:14:04 pattern /netbsd: using 126 buffers containing 516096 bytes of me
Nov 20 15:14:04 pattern /netbsd: pc0 at isa0 port 0x60-0x6f irq 1: color
Nov 20 15:14:04 pattern /netbsd: com0 at isa0 port 0x3f8-0x3ff irq 4: ns82450 or
 ns16450, no fifo
Nov 20 15:14:04 pattern /netbsd: com1 at isa0 port 0x2f8-0x2ff irq 3: ns82450 or
 ns16450, no fifo
Nov 20 15:14:04 pattern /netbsd: com2 at isa0 port 0x3e8-0x3ef irq 5: ns16550a,
working fifo
Nov 20 15:14:04 pattern /netbsd: lpt0 at isa0 port 0x378-0x37f irq 7
Nov 20 15:14:05 pattern /netbsd: wdc0 at isa0 port 0x1f0-0x1f7 irq 14
Nov 20 15:14:05 pattern /netbsd: wd0 at wdc0 drive 0: 244MB 1010 cyl, 9 head, 55
 sec <WDC AC2250F>
Nov 20 15:14:05 pattern /netbsd: fdc0 at isa0 port 0x3f0-0x3f7 irq 6 drq 2
Nov 20 15:14:05 pattern /netbsd: fd0 at fdc0 drive 0: 1.44MB 80 cyl, 2 head, 18
Nov 20 15:14:05 pattern /netbsd: npx0 at isa0 port 0xf0-0xff: using exception 16
Nov 20 15:14:05 pattern /netbsd: biomask 4040 netmask 3a ttymask 3a

machine         "i386"
cpu             "I486_CPU"
ident           PATTERN
timezone        -1
maxusers        8
options         FFS
options         MFS
options         INET
options         "USER_LDT"
options         "COMPAT_43"
options         "TCP_COMPAT_42"
options         XSERVER,UCONSOLE
options         MSDOSFS
options         KERNFS
options         "COMPAT_NOMID"
options         "COMPAT_09"
options         "MACHINE_NONCONTIG"

config          netbsd  root on wd0 swap on wd0

controller      isa0

device          pc0     at isa? port "IO_KBD" irq 1

device          com0    at isa? port "IO_COM1" irq 4
device          com1    at isa? port "IO_COM2" irq 3
device          com2    at isa? port "IO_COM3" irq 5

device          lpt0    at isa? port "IO_LPT1" irq 7

controller      wdc0    at isa? port "IO_WD1" irq 14
disk            wd0     at wdc0 drive ?

controller      fdc0    at isa? port "IO_FD1" irq 6 drq 2
disk            fd0     at fdc0 drive ?

device          npx0    at isa? port "IO_NPX" irq 13

pseudo-device   log
pseudo-device   loop
pseudo-device   pty     32
pseudo-device   sl      1
pseudo-device   speaker