I've had the same issue on 3 different machines that had installed Sierra. 
Hopefully GAE 1.9.42 can address this, as 1.9.40 will not compile because 
it doesn't use Go 1.7.x.

On Saturday, September 10, 2016 at 1:23:07 PM UTC-7, Dmitry Matyukhin wrote:
>
> It seems that the problem is in the new macOS Sierra. I just installed the 
> GM on my main laptop, where appengine used to work and I get exactly the 
> same crash. And I just realised that the other laptop where it was 
> crashing, also had macOS Sierra.
>
> Just searched on the issue tracker and there is already a report - 
> https://code.google.com/p/googleappengine/issues/detail?id=13198 and the 
> crash log look the same.
>
> On Saturday, 3 September 2016 00:00:34 UTC+1, Adam (Cloud Platform 
> Support) wrote:
>>
>> Interesting. This may be worth a cross post to the google-appengine 
>> issue tracker <https://code.google.com/p/googleappengine/issues/list> to 
>> see if someone with a similarly spec'd Mac can reproduce it.
>>
>> On Tuesday, August 30, 2016 at 3:29:46 PM UTC-4, Dmitry Matyukhin wrote:
>>>
>>> Just double checked on my MacBook (12" with Intel Core M),
>>>
>>> $goapp version
>>> go version go1.6.2 (appengine-1.9.40) darwin/amd64
>>>
>>> Initially `go` wasn't installed at all, but 32-bit goapp SDK worked. So 
>>> I installed it with brew and got:
>>> $go version
>>> go version go1.7 darwin/amd64
>>>
>>> It still crashes.
>>>
>>> $ system_profiler SPHardwareDataType
>>> Hardware:
>>>
>>>     Hardware Overview:
>>>
>>>       Model Name: MacBook
>>>       Model Identifier: MacBook8,1
>>>       Processor Name: Intel Core M
>>>       Processor Speed: 1.3 GHz
>>>       Number of Processors: 1
>>>       Total Number of Cores: 2
>>>       L2 Cache (per Core): 256 KB
>>>       L3 Cache: 4 MB
>>>       Memory: 8 GB
>>>       Boot ROM Version: MB81.0164.B18
>>>       SMC Version (system): 2.25f87
>>>       Serial Number (system): C02PM0NFGCN2
>>>       Hardware UUID: 433DD06F-1BCF-5AA8-884C-FA7B668C0B82
>>>
>>> According to Intel, it is a 64-bit processor.
>>>
>>> On Tuesday, 30 August 2016 16:35:50 UTC+1, Dmitry Matyukhin wrote:
>>>>
>>>> Adam, thanks for clarification.
>>>>
>>>> I just tried to install it on another machine - MacBook Pro and I can 
>>>> confirm that 64-bit works. The problem was happening on 12-inch MacBook 
>>>> which is also 64-bit, but I'll double check the version of go that is 
>>>> installed.
>>>>
>>>> On Monday, 29 August 2016 21:40:29 UTC+1, Adam (Cloud Platform Support) 
>>>> wrote:
>>>>>
>>>>> AMD64 is actually the standard used by both Intel and AMD, and is just 
>>>>> another name for 'x86-64' or 'x64' 
>>>>> <https://en.wikipedia.org/wiki/X86-64>. It's so named because AMD 
>>>>> first developed the architecture which Intel later adopted. Rest assured, 
>>>>> we would not release an SDK for a 'darwin_amd64' architecture if it 
>>>>> didn't 
>>>>> exist! 
>>>>>
>>>>> As for the reason it's crashing on your system, it's likely that you 
>>>>> just have an older 32-bit version of Go installed. As of Go 1.5, 
>>>>> 'darwin-amd64' is the only supported architecture 
>>>>> <https://golang.org/dl/>. You can confirm your version and 
>>>>> architecture by typing 'go version' from the command prompt.
>>>>>
>>>>> Otherwise, if you have a very old 2008 or prior Mac with a 1st gen 
>>>>> Core processor, your Mac is 32-bit only.
>>>>>
>>>>> On Sunday, August 28, 2016 at 11:45:39 AM UTC-4, Dmitry Matyukhin 
>>>>> wrote:
>>>>>>
>>>>>> I tried to use Go Runtime for AppEngine for Mac. Since, there is a 
>>>>>> 64-bit version, I installed that one.
>>>>>>
>>>>>> However, whenever I tried to run anything, it was always crashing. 
>>>>>> For example, this happens when I did "goapp get 
>>>>>> google.golang.org/appengine"
>>>>>>
>>>>>> # net
>>>>>> fatal error: unexpected signal during runtime execution
>>>>>> [signal 0xb code=0x1 addr=0x1161be989d12 pc=0xf0eb]
>>>>>>
>>>>>> runtime stack:
>>>>>> runtime.throw(0x497380, 0x2a)
>>>>>>         
>>>>>> /private/var/folders/9y/ppk2fnqj5lscwqw_l6lhdrx8005bt1/T/appengine/go_appengine/goroot/src/runtime/panic.go:547
>>>>>>  
>>>>>> +0x90
>>>>>> runtime.sigpanic()
>>>>>>         
>>>>>> /private/var/folders/9y/ppk2fnqj5lscwqw_l6lhdrx8005bt1/T/appengine/go_appengine/goroot/src/runtime/sigpanic_unix.go:12
>>>>>>  
>>>>>> +0x5a
>>>>>> runtime.unlock(0x988540)
>>>>>>         
>>>>>> /private/var/folders/9y/ppk2fnqj5lscwqw_l6lhdrx8005bt1/T/appengine/go_appengine/goroot/src/runtime/lock_sema.go:107
>>>>>>  
>>>>>> +0x14b
>>>>>> runtime.(*mheap).alloc_m(0x988540, 0x1, 0x21, 0xec2ff0)
>>>>>>         
>>>>>> /private/var/folders/9y/ppk2fnqj5lscwqw_l6lhdrx8005bt1/T/appengine/go_appengine/goroot/src/runtime/mheap.go:492
>>>>>>  
>>>>>> +0x314
>>>>>> runtime.(*mheap).alloc.func1()
>>>>>>         
>>>>>> /private/var/folders/9y/ppk2fnqj5lscwqw_l6lhdrx8005bt1/T/appengine/go_appengine/goroot/src/runtime/mheap.go:502
>>>>>>  
>>>>>> +0x41
>>>>>> runtime.systemstack(0x7fff5fbfe348)
>>>>>>         
>>>>>> /private/var/folders/9y/ppk2fnqj5lscwqw_l6lhdrx8005bt1/T/appengine/go_appengine/goroot/src/runtime/asm_amd64.s:307
>>>>>>  
>>>>>> +0xab
>>>>>> runtime.(*mheap).alloc(0x988540, 0x1, 0x10000000021, 0xed8f)
>>>>>>         
>>>>>> /private/var/folders/9y/ppk2fnqj5lscwqw_l6lhdrx8005bt1/T/appengine/go_appengine/goroot/src/runtime/mheap.go:503
>>>>>>  
>>>>>> +0x63
>>>>>> runtime.(*mcentral).grow(0x98a680, 0x0)
>>>>>>         
>>>>>> /private/var/folders/9y/ppk2fnqj5lscwqw_l6lhdrx8005bt1/T/appengine/go_appengine/goroot/src/runtime/mcentral.go:209
>>>>>>  
>>>>>> +0x93
>>>>>> runtime.(*mcentral).cacheSpan(0x98a680, 0xec2ff0)
>>>>>>         
>>>>>> /private/var/folders/9y/ppk2fnqj5lscwqw_l6lhdrx8005bt1/T/appengine/go_appengine/goroot/src/runtime/mcentral.go:89
>>>>>>  
>>>>>> +0x47d
>>>>>> runtime.(*mcache).refill(0xafa000, 0x21, 0xec2ff0)
>>>>>>         
>>>>>> /private/var/folders/9y/ppk2fnqj5lscwqw_l6lhdrx8005bt1/T/appengine/go_appengine/goroot/src/runtime/mcache.go:119
>>>>>>  
>>>>>> +0xcc
>>>>>> runtime.mallocgc.func2()
>>>>>>         
>>>>>> /private/var/folders/9y/ppk2fnqj5lscwqw_l6lhdrx8005bt1/T/appengine/go_appengine/goroot/src/runtime/malloc.go:642
>>>>>>  
>>>>>> +0x2b
>>>>>> runtime.systemstack(0x979d00)
>>>>>>         
>>>>>> /private/var/folders/9y/ppk2fnqj5lscwqw_l6lhdrx8005bt1/T/appengine/go_appengine/goroot/src/runtime/asm_amd64.s:291
>>>>>>  
>>>>>> +0x79
>>>>>> runtime.mstart()
>>>>>>         
>>>>>> /private/var/folders/9y/ppk2fnqj5lscwqw_l6lhdrx8005bt1/T/appengine/go_appengine/goroot/src/runtime/proc.go:1051
>>>>>>
>>>>>> goroutine 1 [running]:
>>>>>> runtime.systemstack_switch()
>>>>>>         
>>>>>> /private/var/folders/9y/ppk2fnqj5lscwqw_l6lhdrx8005bt1/T/appengine/go_appengine/goroot/src/runtime/asm_amd64.s:245
>>>>>>  
>>>>>> fp=0xc8241ed290 sp=0xc8241ed288
>>>>>> runtime.mallocgc(0x500, 0x0, 0x3, 0xc825f0c400)
>>>>>>         
>>>>>> /private/var/folders/9y/ppk2fnqj5lscwqw_l6lhdrx8005bt1/T/appengine/go_appengine/goroot/src/runtime/malloc.go:643
>>>>>>  
>>>>>> +0x869 fp=0xc8241ed368 sp=0xc8241ed290
>>>>>> runtime.rawmem(0x500, 0x200)
>>>>>>         
>>>>>> /private/var/folders/9y/ppk2fnqj5lscwqw_l6lhdrx8005bt1/T/appengine/go_appengine/goroot/src/runtime/malloc.go:809
>>>>>>  
>>>>>> +0x32 fp=0xc8241ed390 sp=0xc8241ed368
>>>>>> runtime.growslice(0x3b2760, 0xc825f0c400, 0x400, 0x400, 0x401, 0x0, 
>>>>>> 0x0, 0x0)
>>>>>>         
>>>>>> /private/var/folders/9y/ppk2fnqj5lscwqw_l6lhdrx8005bt1/T/appengine/go_appengine/goroot/src/runtime/slice.go:95
>>>>>>  
>>>>>> +0x233 fp=0xc8241ed400 sp=0xc8241ed390
>>>>>> cmd/internal/obj.Symgrow(0xc8200b4000, 0xc8221d5b80, 0x401)
>>>>>>         
>>>>>> /private/var/folders/9y/ppk2fnqj5lscwqw_l6lhdrx8005bt1/T/appengine/go_appengine/goroot/src/cmd/internal/obj/data.go:50
>>>>>>  
>>>>>> +0x237 fp=0xc8241ed4c0 sp=0xc8241ed400
>>>>>> cmd/internal/obj/x86.span6(0xc8200b4000, 0xc8221d5b80)
>>>>>>         
>>>>>> /private/var/folders/9y/ppk2fnqj5lscwqw_l6lhdrx8005bt1/T/appengine/go_appengine/goroot/src/cmd/internal/obj/x86/asm6.go:1962
>>>>>>  
>>>>>> +0x9b9 fp=0xc8241ed650 sp=0xc8241ed4c0
>>>>>> cmd/internal/obj.Flushplist(0xc8200b4000)
>>>>>>         
>>>>>> /private/var/folders/9y/ppk2fnqj5lscwqw_l6lhdrx8005bt1/T/appengine/go_appengine/goroot/src/cmd/internal/obj/objfile.go:300
>>>>>>  
>>>>>> +0x32e fp=0xc8241ed870 sp=0xc8241ed650
>>>>>> cmd/internal/obj.Writeobjdirect(0xc8200b4000, 0xc82039c600)
>>>>>>         
>>>>>> /private/var/folders/9y/ppk2fnqj5lscwqw_l6lhdrx8005bt1/T/appengine/go_appengine/goroot/src/cmd/internal/obj/objfile.go:114
>>>>>>  
>>>>>> +0x21 fp=0xc8241ed888 sp=0xc8241ed870
>>>>>> cmd/compile/internal/gc.dumpobj()
>>>>>>         
>>>>>> /private/var/folders/9y/ppk2fnqj5lscwqw_l6lhdrx8005bt1/T/appengine/go_appengine/goroot/src/cmd/compile/internal/gc/obj.go:88
>>>>>>  
>>>>>> +0xe5f fp=0xc8241edac0 sp=0xc8241ed888
>>>>>> cmd/compile/internal/gc.Main()
>>>>>>         
>>>>>> /private/var/folders/9y/ppk2fnqj5lscwqw_l6lhdrx8005bt1/T/appengine/go_appengine/goroot/src/cmd/compile/internal/gc/lex.go:495
>>>>>>  
>>>>>> +0x2225 fp=0xc8241edde0 sp=0xc8241edac0
>>>>>> cmd/compile/internal/amd64.Main()
>>>>>>         
>>>>>> /private/var/folders/9y/ppk2fnqj5lscwqw_l6lhdrx8005bt1/T/appengine/go_appengine/goroot/src/cmd/compile/internal/amd64/galign.go:127
>>>>>>  
>>>>>> +0x58d fp=0xc8241ede48 sp=0xc8241edde0
>>>>>> main.main()
>>>>>>         
>>>>>> /private/var/folders/9y/ppk2fnqj5lscwqw_l6lhdrx8005bt1/T/appengine/go_appengine/goroot/src/cmd/compile/main.go:32
>>>>>>  
>>>>>> +0x395 fp=0xc8241edf20 sp=0xc8241ede48
>>>>>> runtime.main()
>>>>>>         
>>>>>> /private/var/folders/9y/ppk2fnqj5lscwqw_l6lhdrx8005bt1/T/appengine/go_appengine/goroot/src/runtime/proc.go:188
>>>>>>  
>>>>>> +0x2b0 fp=0xc8241edf70 sp=0xc8241edf20
>>>>>> runtime.goexit()
>>>>>>         
>>>>>> /private/var/folders/9y/ppk2fnqj5lscwqw_l6lhdrx8005bt1/T/appengine/go_appengine/goroot/src/runtime/asm_amd64.s:1998
>>>>>>  
>>>>>> +0x1 fp=0xc8241edf78 sp=0xc8241edf70
>>>>>>
>>>>>>
>>>>>> And then I spotted "asm_amd64.s" in the stacktrace which made me 
>>>>>> double check the installation. So Google provides 32-bit version for x86 
>>>>>> and 64-bit version for AMD. But there are no Macs with AMD processors!
>>>>>>
>>>>>> After installing 32-bit version everything works well. 
>>>>>>
>>>>>

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