> On May 23, 2015, at 9:20 AM, Greg Parker <[email protected]> wrote:
>
> free() does that sometimes. If zombies doesn't find anything then try guard
> malloc.
Good suggestion! I’d forgotten about guard malloc. This changes the crash; now
the parameter to objc_release points to unmapped memory, implying that the
object has been dealloced:
(lldb) p/x $rdi
(unsigned long) $2 = 0x000061000d5a3fd0
(lldb) x $rdi
error: memory read failed for 0x61000d5a3e00
Still no clue what object this is/was, though. And it seems weird that it got
freed instead of turned into a zombie, since I still have zombies enabled too.
I’m not at all good at reading IA64 assembly, but so far my suspicion is that
this object is a temporary NSString being created from a Swift String in order
to pass to -[NSObject addObserver:…] as the keyPath parameter. But since this
NSString never appears in the source code at all, I don’t see how I could be
messing up its refcount.
The method and its disassembly can be found here in case anyone feels like
reading them:
https://gist.github.com/snej/f6c0e1ba9230b3591a9f
<https://gist.github.com/snej/f6c0e1ba9230b3591a9f>
(I tried to get a backtrace, but Xcode crashed when I entered the “bt” command…)
—Jens
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