Backend crashes in 7.0.3

Hello, 

I observe occasionaly crashes on 7.0.3 under medium load:

Backend message type 0x49 arrived while idle
Backend message type 0x44 arrived while idle
Backend message type 0x54 arrived while idle

I recently upgraded from 7.0.2 to 7.0.3 on RH6.0, Linux 2.2.10 and I
haven't observed these messages before. I have
compiled the source on my own  (egcs 2.91.66). 

Can I downgrade from 7.0.3 to 7.0.2 without dump/restore?

Dirk