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List:       netbsd-port-i386
Subject:    Re: kernel page 0
From:       Maxime Villard <max () m00nbsd ! net>
Date:       2016-12-04 9:30:27
Message-ID: 09a1d430-de53-e162-3284-01bdcf19e833 () m00nbsd ! net
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Le 28/11/2016 à 09:57, Masanobu SAITOH a écrit :
>   Hello.
> 
>   Thank you for all of your work.
> 
>   Do you remember the following mail?
> 
>> http://mail-index.netbsd.org/port-i386/2016/01/15/msg003432.html
> 
>   You've fixed a lot of problem on x86, so I suspected that the above
> problem might be fixed. Today, I tried again and I knew the problem
> still exist. I can't fix it because I'm not familiar with vm&pmap :-<
> 
>   As you know, when we fix this problem, we will see a lot of unknown
> bugs. It's important.
> 
>   Thanks.
> 

There is no problem in the amd64 and i386 maps, and NULL is never readable.
In fact, you just forgot to add a {x,z,o,d,u,r,c,s,m} in your "x/l 0x0"
command.

Having only "l" does not actually read anything. With a proper command,
you can see that reading NULL indeed panics the kernel, as expected.
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