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I just opened a solution using XS/master and it crashed within seconds.
Happened with Mono JIT compiler version 220.127.116.11 (2017-02/9ecfd9f Sat Mar 18 02:18:24 EDT 2017)
I've seen reports of this crash since 4.6, also with non-concurrent GC.
Also seen once on jenkins, but never been able to repro so far.
Fixed on 5.0 by bdf17346a6cea527160dd56b5ff448cd296a9da5
Oh wow! Good catch!