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Date: Thu, 20 Aug 2009 19:40:27 -0700
From: Scott Schappell <archon@silvertree.org>
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Subject: Re: Remounting a drive as read/write crashes the system
	and	no	dmesg.boot
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On 8/20/2009 7:36 PM, Scott Schappell wrote:
> On 8/20/2009 4:31 PM, Mel Flynn wrote:
>>
>> http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug.html
>>
>
> OK, /backup was mounted read only, I did the following
>
> umount /backup
> mount -o rw /backup
> [root@arthur ~]# dd if=/dev/zero of=/backup/testfile bs=1024
> dd: /backup/testfile: end of device
> 21122+0 records in
> 21121+0 records out
> 21627904 bytes transferred in 2.215991 secs (9759924 bytes/sec)
> [root@arthur ~]#
>

As of now, the dd command above has not crashed and it's past 3 GiB, 
using the mount -u -w syntax versus unmount, mount -o rw.

This is puzzling.