Here is a FIX for a segfault in usbmuxd when connecting an IPHONE4S...

....

Symptom:
usbmuxd[3579]: segfault at 0 ip 00007fc99315b0f1 sp 00007fffbfa84ce8 error 4 in libc-2.17.so[7fc992ff1000+1bd000]