deflateInit2 causing unknown crashes

[tesiawu]

We've experienced a few crashes that point to the deflateInit2 method when the gzippedDataWithCompressionLevel method in NSData+GZIP is called. Has there been any documentation of a crash like this before?

[nicklockwood]

@tesiawu AFAIK you're the first to report such a crash

[tesiawu]

Hey @nicklockwood, could you take a look into the deflateInit2 method? From what I've gathered, it seems like the method crashes regardless of the value being passed in. It also seems like there are a lot more crashes that are popping up recently. Were there any recent changes related to this method?

[tesiawu]

Sorry, I realized I didn't put the any context! This is what the stacktrace shows for us just before the crashes:

at libsystem_platform.dylib.OSAtomicAnd32Barrier$VARIANT$mp + 0(UNKNOWN_FILE.c:1) at libz.1.dylib.deflateInit2_ + 324(UNKNOWN_FILE.c:1)