Re: (maybe) crash your VAX from userspace

[Ken Wellsch <kwellsch%tampabay.rr.com@localhost>]

On Sat, Mar 23, 2024 at 10:41:51AM -0400, Mouse wrote:
> > I think the point was that he wanted confirmation on real hardware.
> > He also already observed this in simh. :)
> 
> Yes...after seeing simh itself segfault, which leads to doubt that simh
> is to be entirely trusted here.
> 
> I've fetched the 10.0_RC6 VAX sets and am in the process of setting it
> up on my emulator.  It's not real iron, but it is a completely
> independent emulator implementation.

FWIW, not an issue with this version of SIMH.

[   1.0000000] NetBSD 10.0_RC6 (GENERIC) #0: Tue Mar 12 10:19:02 UTC 2024
[   1.0000000]  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/vax/compile/GENERIC
[   1.0000000] MicroVAX 3800/3900
[   1.0000000] total memory = 127 MB
[   1.0000000] avail memory = 119 MB

	...

vax# ifconfig qe0 mtu 512

[  36.4604740] r0=87fd9028 r1=00000000 r2=00000000 r3=87c5ed00 r4=80692f34 r5=00000000 r6=87fd9028 r7=87e9a940
[  36.4604740] r8=00000000 r9=87e9a940 r10=8090697f r11=00000000
[  36.4604740] ap=8b883c7c fp=8b883c68 sp=7ffff52c pc=80259431
[  36.4604740] panic: SEGV in kernel mode: pc 0x80259431 addr 0
[  36.4604740] cpu0: Begin traceback...
[  36.4604740] panic: SEGV in kernel mode: pc 0x80259431 addr 0
[  36.4604740] Stack traceback : 
[  36.4604740]   Process is executing in user space.
[  36.4604740] cpu0: End traceback...

[  36.4604740] dump to dev 9,17 not possible

HALT instruction, PC: 80013565 (PUSHAB 802A2F6B)

sim> show version

VAX simulator V3.12-4 [64b data, 64b addresses, Threaded Ethernet Packet transports:PCAP:TAP:UDP]