This Can't be Good

Part of a crash log report that caused my iPhone not to sync last night:

Crashed Thread:  0  Dispatch queue: com.apple.main-thread

Exception Type:  EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000100700000

VM Regions Near 0x100700000:
    MALLOC_TINY      0000000100600000-0000000100700000 [ 1024K] rw-/rwx SM=PRV  
--> STACK GUARD      0000000100700000-0000000100701000 [    4K] ---/rwx SM=NUL  stack guard for thread 1
    Stack            0000000100701000-0000000100783000 [  520K] rw-/rwx SM=COW  thread 1

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread

• macosx