Instruction access exception; one cause being trying to load an
instruction from an illegal address.
PC=0x00000000FFFFFFFC
Latest crash info for cpu 1:
Exception state (sv=0x4A39CC80)
PC=0xFFFFFFFC; MSR=0x00009030; DAR=0xF0130F70; DSISR=0x00000000;
The PC here is actually Save and Restore Register 0 (SRR0), which is
set to the effective address of the instruction that the processor
would have executed. If the address is a branch target, SRR0 is set
to the branch target address.
The link register is set to the return address following a bl (branch
then link) instruction, aka a function call. Since LR is PC + 4, I
believe the last instruction that ran was "bl 0xfffffffc". This in
turn leads me to think that somewhere a bogus function pointer has
been given to the kernel. Since you bring up USB, one possibility is
that you're using asynchronous USB calls in your app and you passed a
bad callback function pointer.
Since the kernel branched so far out into the weeds, it's
unfortunately not possible to find the rest of the backtrace.
Assuming that a callback pointer is the culprit, you could add some
defensive code to test that the function pointer is say, <
0xfffff000, before passing it to USB.
Backtrace:
0xFFFFFFFF
Proceeding back via exception chain:
Exception state (sv=0x4A39CC80)
previously dumped as "Latest" state. skipping...
Exception state (sv=0x30AB0C80)
PC=0x90007878; MSR=0x0000D030; DAR=0xE04C7CE0; DSISR=0x00200000;
LR=0x900073F8; R1=0xBFFEDCA0; XCP=0x00000030 (0xC00 - System call)
Kernel version:
Darwin Kernel Version 7.9.0:
Wed Mar 30 20:11:17 PST 2005; root:xnu/xnu-517.12.7.obj~1/RELEASE_PPC
Hope this helps,
--gc
__________________________________________________________________
Garth Cummings
Apple Developer Technical Support email@hidden
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