2.9.1 reload crashes

[Nick Edwards]

Today, upgraded 2.9.0 to 2.9.1, and found that when sa-update script
runs, which at the end of all of that, calls amavisd reload

amavisd exits!
only log message is:

(!)Net::Server: 2014/07/01-00:12:31 Re-exec server during HUP

this happens  every time on reload, but a stop/start or restart, does
not appear to cause any issue

Any suggestions?

(if it helps - perl 5.10.1, and kernel 3.14.10 on slackware)