I'm accustomed have longer bash history - usually my HISTSIZE=10000. Never from Redhat 4 epoch was problems with this, but now at F15 and F16 I in several cases I found weirdness, when my commands are missing in history, in one case I had .bash_history completely empty.
IMO it is problem in newer bash versions, but yet more I suspect when it may be any cripled systemd behavior at init 0/6 (sorry, i want say poweroff.target/reboot.target ;), whether systemd (in order to halt/reboot computer several microseconds faster) kill bash before it is able save their stuff.
Have You met someone with this problem? Any idea how diagnose it?
Thanks, Franta