[Bug 202680] Silent data corruption on em(4) interfaces

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=202680

--- Comment #1 from Dmitry Afanasiev <KOT at MATPOCKuH.Ru> ---
Created attachment 160557
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=160557&action=edit
Corrupted data in transferred file

I created a 16Gb file "hugefile" contains 16777216 lines with 1023 spaces and
one '\n' (16777216 * (1023 + 1) = 17179869184 = 16Gb) and transferred this file
via FTP.
On destination machine I checked resulting file by this command:
$ grep '[^ ]' hugefile > wrong

Result (wrong data in hugefile) is this attachment.

As far as I know, errors are checked on:
- ethernet level
- IP level
- TCP level.
, but I got corrupted data from TCP level.

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