This issue is encountered every time, that make the daemon to reload every time.
Running with squid3.2 + Debian 6 + 64 bits
2011-12-30 15:47:27 [27079] the new configuration and database are loaded for ufdbguardd 1.27
2011-12-30 15:47:32 [27079] pstack Attaching to program: /proc/27079/exe, process 27079
2011-12-30 15:47:32 [27079] pstack [Thread debugging using libthread_db enabled]
2011-12-30 15:47:32 [27079] pstack 0x00007f71b5666be5 in pthread_join () from /lib/libpthread.so.0
2011-12-30 15:47:32 [27079] pstack Hangup detected on fd 0
2011-12-30 15:47:32 [27079] pstack error detected on stdin
2011-12-30 15:47:32 [27079] pstack A debugging session is active.
2011-12-30 15:47:32 [27079] pstack
2011-12-30 15:47:32 [27079] pstack Inferior 1 [process 27079] will be detached.
2011-12-30 15:47:32 [27079] pstack
2011-12-30 15:47:32 [27079] pstack Quit anyway? (y or n) [answered Y; input not from terminal]
2011-12-30 15:47:32 [27079] pstack Detaching from program: /proc/27079/exe, process 27079
2011-12-30 15:47:32 [27079] "thread worker-47" caught signal 11.
2011-12-30 16:11:49 [26591] pstack Attaching to program: /proc/26591/exe, process 26591
2011-12-30 16:11:49 [26591] pstack [Thread debugging using libthread_db enabled]
2011-12-30 16:11:49 [26591] pstack 0x00007f3ba0cfebe5 in pthread_join () from /lib/libpthread.so.0
2011-12-30 16:11:49 [26591] pstack Hangup detected on fd 0
2011-12-30 16:11:49 [26591] pstack error detected on stdin
2011-12-30 16:11:49 [26591] pstack A debugging session is active.
2011-12-30 16:11:49 [26591] pstack
2011-12-30 16:11:49 [26591] pstack Inferior 1 [process 26591] will be detached.
2011-12-30 16:11:49 [26591] pstack
2011-12-30 16:11:49 [26591] pstack Quit anyway? (y or n) [answered Y; input not from terminal]
2011-12-30 16:11:49 [26591] pstack Detaching from program: /proc/26591/exe, process 26591
2011-12-30 16:11:49 [26591] "thread worker-58" caught signal 11.
the issue was fixed in version 1.28.