This is a realtime MMO client, at some random point it will crash with a jump to 0, and the stack frame is unreadable. The crashreporter (and gdb) will report thead 0 crashed
XC_BAD_ACCESS (SIGBUS) KERN_PROTECTION_FAILURE at 0x0000000000000000
and srr0=lr=exception address=0
How can I catch where this error occurs?
If your stack pointer (r1) and link register are trashed then it's not looking good. However, it's possible that some other registers may still have the value of a frame pointer in them - for example non-leaf functions often seen to move the address to they return to to/from the stack via r0.
Other than that there's a couple of tricks you could pull - assuming that there is nothing mapped in the processes' address space at address 0x0 (which appears to be the case from the EXEC_BAD_ACCESS error) you could write a simple preload library which mapped page zero; which would allow you to add a breakpoint at 0x0; which may give you more info on what's going on.