Hi list,
I'm having trouble reproducing (and fixing) a rare bug that I
sometimes get reports about.
Here's the code that causes the crash. streamPosition and length are
checked to make sure they're within the range of the NSData object:
// Allocate a buffer.
void *buffer = malloc(length);
// Fill the buffer with the requested bytes.
[_data getBytes:buffer range:NSMakeRange(streamPosition, length)];
Very occasionally, this fails with this crash:
Exception: EXC_BAD_ACCESS (0x0001)
Codes: KERN_PROTECTION_FAILURE (0x0002) at 0x00000000
Thread 6 Crashed:
0 <<00000000>> 0xffff0d3f __memcpy + 1439 (cpu_capabilities.h:228)
1 com.apple.Foundation 0x9282e456 -[NSConcreteData
getBytes:range:] + 267
I don't think it's the file that the NSData is created from - indeed,
the customer sent me a copy of the file in question and it works
perfectly on my machine. Any help in debugging this would be greatly
appreciated! Surrounding the code in a @try block doesn't help - it
still ends up with a hard crash (which is what I was expecting, given
that is a EXC_BAD_ACCESS).
Thanks,
-- Daniel
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