Thank you for posting your crash log. Your app is being hung while it's being loaded into memory so watchdog is killing it because FRONTBOARD became unresponsive:
Termination Reason: FRONTBOARD; [2343432205]
<RBSTerminateContext| domain:10 code:0x8BADF00D explanation:process-launch watchdog transgression: application<com.myapp.xyz>:522 exhausted real (wall clock) time allowance of 20.00 seconds
...
Thread 0 Crashed:
0 dyld 0x101b5dc80 __fcntl + 8
1 dyld 0x101b8d628 fcntl + 84
2 dyld 0x101b5d530 dyld4::SyscallDelegate::fcntl(int, int, void*) const + 28
3 dyld 0x101b6db18 dyld4::Loader::mapSegments(Diagnostics&, dyld4::RuntimeState&, char const*, unsigned long long, dyld4::Loader::CodeSignatureInFile const&, bool, dyld3::Array<dyld4::Loader::Region> const&, bool, bool, dyld4::Loader::FileValidationInfo const&) + 400
4 dyld 0x101b63f80 invocation function for block in dyld4::JustInTimeLoader::makeJustInTimeLoaderDisk(Diagnostics&, dyld4::RuntimeState&, char const*, dyld4::Loader::LoadOptions const&, bool, unsigned int) + 64
During launch is your app doing anything out of the ordinary? For example, loading a large amount of libraries into memory with dlopen during startup?
Matt Eaton
DTS Engineering, CoreOS
meaton3@apple.com