From owner-freebsd-stable@freebsd.org  Sun Oct  8 19:27:33 2017
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Subject: Re: dd: vm_fault: pager read error
To: grarpamp <grarpamp@gmail.com>, freebsd-stable@freebsd.org
References: <CAD2Ti28gjhk9c2CDtuZSj0z6RXF=b3sibKmPW-M+fsxe6cK68A@mail.gmail.com>
From: Eugene Grosbein <eugen@grosbein.net>
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Date: Mon, 9 Oct 2017 02:05:21 +0700
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09.10.2017 1:23, grarpamp пишет:
> Here is a report of a repeatable unrecoverable problem.
> 
> 11.0 release amd64 r306420
> 
> kern.geom.debugflags=0 (unmodified)
> 
> # dd if=/dev/zero of=/dev/ada0s1 seek=2048 count=1 bs=1m
> 1+0 records in
> 1+0 records out
> 1048576 bytes transferred
> 
> # reboot
> # <reboot: Device not configured>

The problem is known and already fixed. You should upgrade.