[Bug 238663] [UFS] Corrupted files since migration to FreeBSD11

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238663

--- Comment #3 from Masse Nicolas <nicolas.masse at stormshield.eu> ---
In fact I can't give you the file I ran my tests with, but fortunately I was
able to reproduce the issue with the archive llvm50-5.0.2_1.txz from pkg (took
that one because it was on my computer).
I also update my scripts in order to have something more generic, so that I can
attach them to this issue.

Here is how I did reproduce:
- grab the file
https://pkg.freebsd.org/FreeBSD:10:amd64/latest/All/llvm50-5.0.2_1.txz (other
archives should work too, but this is the one I used for my tests)
- untar the archive and generate the md5 file using the script compute_md5.sh
- copy the tar/md5 files on a specific device*
- run the test in loop using the command "./test_disk.sh llvm50-5.0.2_1.txz
/dev/<my_partition> md5_llvm5.txt"

* only devices with a recent SSD did show the problem

The number of retry to have the problem may vary from 3 up to more than 20
attempts (my last run got one corrupted file after 33 attempts).

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