NSProgress instance crashes with when increasing completed unit count

Number:rdar://19591158 Date Originated:Jan 25 2015
Status:Open Resolved:
Product:OS X SDK Product Version:
Classification: Reproducible:
I am getting an occasional crash in this example project, that seems to be in NSProgress. I have attached an example project as well as a backtrace at the crash site.


Steps to Reproduce:
1. Run the attached example project.
2. Click the “Do lots of work” button in the main app window.
3. If it doesn’t crash at one run, just click it again. Eventually it will crash.

Expected Results:
No crash.

Actual Results:
Crash with EXC_BAD_ACCESS.

Yosemite 10.10.1 (14B25), Xcode Version 6.1.1 (6A2008a)


Retina Macbook Pro mid-2012


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