Subject: bug#30174: shred bug - 1st byte written is wrong sometimes

From: Paul Eggert <[email-masked]>
Date: Fri, 19 Jan 2018 16:21:10 -0800

On 01/19/2018 10:19 AM, [email-masked] wrote:
> shred is doing
> wrong.
> Looks like a bug to me.

I don't see why it is a bug. It does appear to be intended behavior. 
Look in the source code, at src/shred.c, and look for "Invert the first 
bit of every sector."