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Created attachment 19930 [details]
VS Mac IDE log
See attached crash log and VS Mac log for managed and native stack traces.
> $ mono64 --version
> Mono JIT compiler version 4.8.0 (mono-4.8.0-branch/135ebee Mon Jan 30 12:03:00 EST 2017)
> Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
> TLS: normal
> SIGSEGV: altstack
> Notification: kqueue
> Architecture: amd64
> Disabled: none
> Misc: softdebug
> LLVM: yes(3.6.0svn-mono-master/8b1520c)
> GC: sgen
Created attachment 19931 [details]
Crash reporter log
Looks like an sgen root contains a reference to a nursery object that it's missing its least significant byte.
Is this reproductible ? At least lldb attaching could be useful.
Fixed on 5.0 by bdf17346a6cea527160dd56b5ff448cd296a9da5