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I had found a BUG about to create a PerformanceCounter.
It happend in Mono 3.0.12.
When i went to create a new PerformanceCounter Category and i didn't pass the category help infomation in currently method, It'll failure.
The concrete method is:
METHOD: mono_perfcounter_create (MonoString *category, MonoString *help, int type, MonoArray *items)
Info: when i passed help argument value is NULL, and then the source code of 1400 line will be failure, because of
the strlen() function cannot calculate NULL pointer size for "cphelp" local.