"mutex destroyed while busy" when stopping ASIOTest

[dechamps]

Just got this once:

2019-01-23T20:08:34.4659475-00:00 16808 15816 bufferSwitchTimeInfo(params = (ASIO time with reserved 0 0 0 0, time info (ASIO time info with speed 0, system time 802573166000000, sample position 0, sample rate 48000 Hz, flags 7 [kSystemTimeValid, kSamplePositionValid, kSampleRateValid], reserved 0 0 0 0 0 0 0 0 0 0 0 0), time code (ASIO time code with speed 0, samples 0, flags 0, future 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0)), doubleBufferIndex = 0, directProcess = 1)
2019-01-23T20:08:34.4668960-00:00 16808 15816 ASIOGetSamplePosition()
2019-01-23T20:08:34.4676852-00:00 16808 15816 -> 0 [ASE_OK]
2019-01-23T20:08:34.4678572-00:00 16808 15816 Sample position: 0 timestamp: 0
2019-01-23T20:08:34.4680116-00:00 16808 15816 ASIOOutputReady()
2019-01-23T20:08:34.4683469-00:00 16808 15816 -> -1000 [ASE_NotPresent]
2019-01-23T20:08:34.4685409-00:00 16808 15816 Buffer switch count: 469/469
2019-01-23T20:08:34.4687069-00:00 16808 15816 <- nullptr
2019-01-23T20:08:34.4687617-00:00 16808 12064
2019-01-23T20:08:34.4689738-00:00 16808 12064 ASIOStop()
d:\agent\_work\3\s\src\vctools\crt\crtw32\stdcpp\thr\mutex.c(51): mutex destroyed while busy

This after hitting CTRL+C in ASIO401Test. It doesn't seem easy to reproduce.

[dechamps]

I'm still unable to reproduce this, and the stopping logic has been reworked several times since then (in particular 7ccbf3e and 7ccbf3e), so I'm calling it.