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profiling:invalid arc tag ( iOS unit tests )

profiling:invalid arc tag ( iOS unit tests )
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We’re running unit tests in the CI flow for our iOS products.

One day the CI builds started failing with hundreds of lines of the following:

profiling:invalid arc tag (0x0000000c)
profiling:invalid arc tag (0x43555b2d)
profiling:invalid arc tag (0x0000000c)
profiling:invalid arc tag (0x43555b2d)
profiling:invalid arc tag (0x0000000c)
profiling:invalid arc tag (0x614d534e)
profiling:invalid arc tag (0x5f787863)
profiling:invalid arc tag (0x00000000)
profiling:invalid arc tag (0x00000000)
** TEST FAILED **

But there were no actual failures in any of the tests.
Turns out the thing to do is to clean out the derived data folder
( default: ~/Library/Developer/Xcode/DerivedData )

Problem solved 🙂

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