I've experienced the following problem (Linux 2.4.22 + gcc 3.2.2):

My interface setting is: "interfaces = 192.168.1.0/24" and "bind interfaces 
only = Yes"

smbd and nmbd are running fine after startup. But when I change anything with 
my network interfaces (i.e. adding or removing an interface), nmbd dies within 
the next minutes, claiming "reload_interfaces: No subnets to listen to. 
Shutting down..."

I've had a closer look and found out that on the call of load_interfaces() 
(from reload_interfaces()) the interface string hadn't been "192.168.1.0/24", 
but only "192.168.1.0". Thus, it couldn't find the network any longer, as the 
netmask didn't match.

The problem seems to be the following line in interpret_interfaces():
 /* parse it into an IP address/netmasklength pair */
 *p++ = 0;

Here, the "/" is overwritten to split the string into tokens. However, as p 
points to Globals.szInterfaces, it seems to modify the string also there. 
Thus, next time lp_interfaces() is used, the configuration settings are 
returned as if the "/24" had never been there.