Odd history clobbering.

[Matthew A. R. Sherian]

I have seen, upon occasion, that my ridiculously long HISTSIZE  
(100000) will be truncated if two bash instances are closed at the  
same time. Always to 1000 lines. In order to work around this behavior  
I have a rather icky .bash_logout that uses fuser and gzip to archive  
the entire history to a new file whenever a shell instance exits. Do  
any other bash users see history truncation? If you do, aside from  
working around the issue have you any advice for methods by which this  
may be further analysed? Or perhaps there is a known remedy.