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Date: Wed, 10 Feb 2016 10:46:31 +0100
From: Thomas Quinot <thomas@FreeBSD.ORG>
To: Maxim Sobolev <sobomax@FreeBSD.org>
Cc: kib@freebsd.org, src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-head@freebsd.org
Subject: Re: svn: head/bin/dd
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* Maxim Sobolev, 2016-02-10 :

> $ dd if=/dev/zero of=/tmp/foo.bar bs=1m count=10
> 10+0 records in
> 10+0 records out
> 10485760 bytes transferred in 0.003244 secs (3232431656 bytes/sec)
> $ ktrace dd if=/tmp/foo.bar of=/tmp/foo.bar1 bs=1m conv=sparse
> 10+0 records in
> 10+0 records out
> $ ls -l /tmp/foo.bar /tmp/foo.bar1
> -rw-r--r--  1 sobomax  wheel  10485760 Feb  9 23:59 /tmp/foo.bar
> -rw-r--r--  1 sobomax  wheel         0 Feb  9 23:59 /tmp/foo.bar1


Hummm, this looks clearly incorrect :-)

Will look into this ASAP. Would you mind opening a PR so that we can
track the analysis and resolution of this issue?

Thanks!
Thomas.