Re: PAE + i7 + 24G RAM + i386 kernel = panic

[Stephen Borrill <netbsd%precedence.co.uk@localhost>]

On Thu, 31 Mar 2016, Swift Griggs wrote:
> I just took the GENERIC kernel, modified one line to enable PAE and then 
> rebooted my i7 with 24G of RAM. I'm using NetBSD 7.0 i386. As soon as the 
> bootloader passes off to the kernel, it crashes and drops into the debugger. 
> Trying to do a 'bt' (backtrace) causes an instant-reboot.
>
> So, I recompiled again and turned on all the debugging features. It didn't 
> crash this time and I was able to get a backtrace (once, but type it twice 
> and get another instant-reboot). I can transcribe what I saw on the screen 
> and file a PR if that's helpful. However, I'm curious:
>
> 1. Is this a known issue ?
>
> 2. Is this reproducible for anyone else ?

Not tried it with GENERIC, but with XEN3_DOMU I found that the actual RAM 
you got was mod(4GB), so 3=>3, 4=>0, 5=>1, etc. Therefore every multiple 
of 4GB (e.g. 24GB) failed to boot as there was zero usable RAM.

--
Stephen