Примеры ошибок, обнаруженных с помощью диагностики V3089
V3089. Initializer of a field marked by [ThreadStatic] attribute will be called once on the first accessing thread. The field will have default value on different threads.
Mono
V3089 Initializer of a field marked by [ThreadStatic] attribute will be called once on the first accessing thread. The field will have default value on different threads. System.Data.Linq-net_4_x Profiler.cs 16
static class Profiler
{
[ThreadStatic]
private static Stopwatch timer = new Stopwatch();
....
}