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

[drago01]

On Mon, Feb 16, 2015 at 9:34 AM, Alexander Ploumistos
<alex.ploumistos at gmail.com> wrote:
> Hello,
>
> I have upgraded 3 systems to a nonproduct F21 and I have installed F21
> to a couple of others using the x86_64 Live Workstation image. They
> all suffer from intermittent losses of bash history. When the machines
> are booted or rebooted, more than half the times, there are commands
> missing from .bash_history files. It's not only that the previous
> sessions have not been appended to the files, entire portions of the
> files are wiped on occasion, e.g. history files that were more than
> 2000 lines long are now reduced to just a couple of commands.
>
> There was a bug filed against systemd during F21 testing (#1170765),
> where I followed up, but I have no idea if systemd really is to blame
> or if there is something else that could be touching history files. I
> have read the release notes as well as the system administrator's
> guide, but couldn't find anything relevant. Does anyone have any idea
> what might be off here? Which system components are involved in
> terminal history management?

Bash ... the last closes session "wins" so if you have multiple shells
open one might overwrite the history of the other one.