This has been fixed by Xamarin in v4.0.4.4 of the MonoSDK. There is a comment 
in their source that says
"* Apple now loads a different version of pthread_getspecific when launched 
from Xcode"  and they look for a different sequence of instructions. Eww...

DaveB

> Date: Tue, 03 Nov 2015 22:32:02 +0000
> From: Dave Burnard <[email protected]>
> To: "[email protected]" <[email protected]>
> Subject: Re: Crash running C code built on OS X El Capitan in Xcode 7
> Message-ID: <[email protected]>
> Content-Type: text/plain; charset="utf-8"
> 
> We see a similar crash in our app in mono-runtime initialization when trying 
> to debug on El Cap.
> In our scenario it crashes launching the app under Xcode 6.X and Xcode 7, but 
> the app runs fine from the Finder, command line, or under lldb.
> 
> I posted about this on the 
> [email protected]<mailto:[email protected]> list and a few 
> others appear to be seeing this as well, but no remedy has been suggested.
> 
> Dave Burnard
> 
> 
> Message: 2
> Date: Tue, 03 Nov 2015 11:43:32 +0000
> From: Sak Wathanasin 
> <[email protected]<mailto:[email protected]>>
> To: [email protected]<mailto:[email protected]>
> Subject: Re: Crash running C code built on OS X El Capitan in Xcode 7
> Message-ID:
> <8bd9be893d7bbe7c9c5e021409256063.squir...@post.network-analysis.ltd.uk<mailto:8bd9be893d7bbe7c9c5e021409256063.squir...@post.network-analysis.ltd.uk>>
> 
> Content-Type: text/plain; charset=iso-8859-1
> 
> 
> On Mon, November 2, 2015 17:24, Jens Alfke wrote:
> 
> If you do keep troubleshooting on your own, what I would try next is starting 
> an lldb session from
> a shell and running your program in it. That will isolate whether it's 
> something to do with
> Xcode itself.
> 
> I'm seeing this crash in the mono runtime as well and I can confirm that it 
> runs fine in lldb when
> invoked from the command line but not when invoked from Xcode (7.0, 7.1; 
> works in 6.4). When I was
> trying to get our app EC-ready I had to resort to using lldb directly and the 
> good old print
> statements inserted into the code.
> 
> --
> Sak Wathanasin
> Network Analysis Limited           http://www.network-analysis.ltd.uk
> 
> 3 Edison Buildings, Electric Wharf, Coventry CV1 4JA, UK
> Registered in England No: 2407211
> Phone: (+44) 24 7655 12 20     Mobile: (+44) 79 70 75 19 12
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