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Date: Fri, 17 Mar 2017 13:56:54 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Bertram Scharpf <lists@bertram-scharpf.de>
cc: freebsd-questions@freebsd.org
Subject: Re: Second severe crash in six weeks
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On Fri, 17 Mar 2017, Bertram Scharpf wrote:

> On Thursday, 16. Mar 2017, 08:59:44 +0000, Matthew Seaman wrote:
>> On 15/03/2017 22:22, Bertram Scharpf wrote:
>>> since I upgraded to FreeBSD 11.0, every second
>>> port rebuild freezes the system. Besides that,
>>> in the last two weeks I had two packages that
>>> refused to build.
>>
>> This does sound like hardware problems to me.
>
> I admit the hardware is a little bit old. But at the moment
> _everything_ is messed up almost at once. That's too much.
>
> Today I began trying to reproduce the problem by creating
> a USB stick with 11.0. I started saying this:
>
>  # dd if=/dev/zero of=usbstick.img bs=1M count=7552

A count should not be necessary, it will stop when it runs out of input.

> And yet, the system froze again!

This really sounds like hardware problems, likely RAM or power supply. 
Can it run memtest86 for any length of time?