It's an attempted comm_read of closed FD after reconfigure.
Nasty, but I think the asserts can be converted to a nop return. Does anyone know of a subsystem that would fail badly after a failed read with all its sockets and networking closed anyway?
Amos -- Please be using Current Stable Squid 2.7.STABLE6 or 3.0.STABLE15 Current Beta Squid 3.1.0.7