osx - What do the different exception codes in OS X / iOS Crash reports mean? -

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in apple crash reports, there 2 lines providing exception type , exception codes crash report. know these codes mean?

there self-explaining ones ones, kern_invalid_address:

for example, 1 null pointer dereference:

exception type:  exc_bad_access (sigsegv) exception codes: kern_invalid_address @ 0x0000000000000000

if made error pointer arithmetic, you'll end similar:

exception type:  exc_bad_access (sigsegv) exception codes: kern_invalid_address @ 0x00007fff50399000

but there lots of these exception codes! example, here's 1 encountered , have no clue means (the address points big memory-mapped file):

exception type:  exc_bad_access (sigbus) exception codes: 0x000000000000000a, 0x0000000137676004

all found crash reports this technote, no detailed reference how interpret exception codes.

a list of exception codes can found in xnu source. 0x000000000000000a kern_mem0ry_error:

#define kern_memory_error       10     /* during page fault, memory object indicated      * data not returned.  failure      * may temporary; future attempts access      * same data may succeed, defined memory      * object.      */

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