GNU bug report logs - #27241
diff command modified my file

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Hong Jehn <hongjehn <at> icloud.com>
To: bug-diffutils <at> gnu.org
Subject: diff command modified my file
Date: Mon, 05 Jun 2017 04:05:37 +0800

When I use command "diff -qr abc/ usb/abc/" to compare 2 directory,  it changes the "centos_7_x86_64_Minimal.iso" sometime but the file size didn't change even when I just ran the same command and it says they are the same. Other file are fine, it changes only this iso file.

Also, I wrote a similler program like diff before it came out the same problem. I guess it's a glibc bug? I kept the broken file in case you need it.

This problem comes out like once a week, I kept the sha256-code but this problem seems serious.

Message #8 received at 27241 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Hong Jehn <hongjehn <at> icloud.com>, 27241 <at> debbugs.gnu.org
Subject: Re: [bug-diffutils] bug#27241: diff command modified my file
Date: Sun, 4 Jun 2017 14:42:21 -0700

Hong Jehn wrote:
> When I use command "diff -qr abc/ usb/abc/" to compare 2 directory,  it changes the "centos_7_x86_64_Minimal.iso" sometime but the file size didn't change even when I just ran the same command and it says they are the same. Other file are fine, it changes only this iso file.
> 
> Also, I wrote a similler program like diff before it came out the same problem. I guess it's a glibc bug? I kept the broken file in case you need it.
> 
> This problem comes out like once a week, I kept the sha256-code but this problem seems serious.
> 
> 

Since the problem affects multiple programs, it must be something else in your 
system, either in the C library or (more likely) in the underlying file system 
code or something like that.

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