Which of the changes introduced in F21 might affect bash history?

[Alexander Ploumistos]

On Mon, Feb 16, 2015 at 12:06 PM, Tomasz Torcz <tomek at pipebreaker.pl> wrote:
>   systemd only involvement seem to be killing processes in user
> session being closed.  Maybe bash is killed before it flushes
> history?

This would make sense if the problem only involved session history not
getting appended (which does happen), but we are also seeing user and
root .bash_history files randomly losing parts of their contents or
even being emptied.