STINNER Victor <vstin...@python.org> added the comment:

> I mention the QueryPerformanceFrequency error case here (stack misalignment): 
> https://bugs.python.org/issue41299#msg395237

Do you think that pytime.c has the bug? I don't think so.

> There are three places win_perf_counter_frequency() can fail: 
> https://github.com/python/cpython/blob/bb3e0c240bc60fe08d332ff5955d54197f79751c/Python/pytime.c#L974

In theory yes, in practice we got zero error reports. So it sounds like it 
cannot happen.

I don't think that it's a good pratice to start to add checks in all functions 
using a clock "just in case" the clock might fail.

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