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NSCursor mismatched push and pop

From: David Chisnall
Subject: NSCursor mismatched push and pop
Date: Thu, 3 Oct 2013 18:07:43 +0100


I managed to reproduce the NSCursor mismatched push / pop issue, with tracing 
enabled.  The log is here:

I haven't yet done more than glance at it, but perhaps someone who knows this 
code better than me could gain more insight from it.  The trace is from 
launching the application until exit.  I exited after I was sure that the bug 
had been triggered.

For each NSCursor push or pop[1], there is a stack trace.  Ignore any functions 
in the trace that start .tesla or __tesla in the stack traces, these are 
artefacts of the instrumentation.


[1] Unfortunately, in this log it isn't totally clear whether the class or 
instance method is being called, so it looks like there are some duplicate pops 
that are actually -pop calling +pop.  I'll improve the trace output and try to 
recreate it.

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