Date: Thu, 29 Jul 1999 07:03:34 -0400 (EDT) From: Thomas David Rivers <rivers@dignus.com> To: green@FreeBSD.ORG, rivers@dignus.com Cc: freebsd-hackers@FreeBSD.ORG, jmz@FreeBSD.ORG Subject: Re: interesting bug in /usr/bin/cmp Message-ID: <199907291103.HAA68156@lakes.dignus.com> In-Reply-To: <Pine.BSF.4.10.9907290051210.3955-100000@janus.syracuse.net>
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> > > > > > > If someone is interested to solve a problem: > > > > > > $ dd if=/dev/zero bs=8848 count=1 of=a 2>/dev/null > > > $ cp a b > > > $ cmp a b 0 0x300 > > > Segmentation fault (core dumped) > > > $ cmp a b 0 0x200 > > > cmp: EOF on b > > > $ cmp a b 0x300 0 > > > cmp: EOF on a > > > > > > Jean-Marc > > > > > > > I've seen a similar problem when doing cmp with CD-ROM > > devices (I believe I entered a PR on it.) > > > > I think the problem has to do with cmp's use of mmap(), and > > potential issues there... But, that's just a guess on my part. > > It has to do with mmap(), but not any specific issues with mmap(), just a > bug in its use. > > If noone has any objections, I will commit this and MFC it in a week or so. When I get into work today, I can apply your change and see if it fixes my problem as well. If it works, then, we can close the PR I entered on it... (kern/11969). - Dave Rivers - To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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