See https://discussions.apple.com/message/34231755

corespeechd.sample.txt

    94 Thread_1073489   DispatchQueue_10: com.apple.root.default-qos  (concurrent)
    + 94 start_wqthread  (in libsystem_pthread.dylib) + 13  [0x7fff7f862405]
    +   94 _pthread_wqthread  (in libsystem_pthread.dylib) + 619  [0x7fff7f8626dd]
    +     94 _dispatch_worker_thread2  (in libdispatch.dylib) + 90  [0x7fff7f6304bd]
    +       94 _dispatch_root_queue_drain  (in libdispatch.dylib) + 671  [0x7fff7f62fe80]
    +         94 _dispatch_client_callout  (in libdispatch.dylib) + 8  [0x7fff7f621dcf]
    +           94 _dispatch_call_block_and_release  (in libdispatch.dylib) + 12  [0x7fff7f620d53]
    +             94 __59-[CSRemoteControlClient voiceTriggerEnabledWithCompletion:]_block_invoke_2  (in CoreSpeech) + 387  [0x7fff66f95235]
    +               94 ???  (in corespeechd)  load address 0x10de44000 + 0x6159  [0x10de4a159]
    +                 92 ???  (in corespeechd)  load address 0x10de44000 + 0x6490  [0x10de4a490]
    +                 ! 92 ???  (in corespeechd)  load address 0x10de44000 + 0x65c3  [0x10de4a5c3]
    +                 !   91 -[CSRemoteControlClient transferVoiceTriggerAsset:forLanguageCode:completion:]  (in CoreSpeech) + 1167  [0x7fff66f940bf]
    +                 !   : 91 _dispatch_group_wait_slow  (in libdispatch.dylib) + 40  [0x7fff7f622d43]
    +                 !   :   91 _dispatch_wait_on_address  (in libdispatch.dylib) + 134  [0x7fff7f622531]
    +                 !   :     91 _dispatch_ulock_wait  (in libdispatch.dylib) + 47  [0x7fff7f6225ac]
    +                 !   :       91 __ulock_wait  (in libsystem_kernel.dylib) + 10  [0x7fff7f7ab94e]
    +                 !   1 -[CSRemoteControlClient transferVoiceTriggerAsset:forLanguageCode:completion:]  (in CoreSpeech) + 1021  [0x7fff66f9402d]
    +                 !     1 -[CSRemoteControlClient _transferFile:at:completion:]  (in CoreSpeech) + 476  [0x7fff66f92e33]
    +                 !       1 xpc_file_transfer_create_with_path  (in libxpc.dylib) + 31  [0x7fff7f8b9fdf]
    +                 !         1 __open  (in libsystem_kernel.dylib) + 10  [0x7fff7f7aa152]
    +                 2 ???  (in corespeechd)  load address 0x10de44000 + 0x6399  [0x10de4a399]
    +                   1 +[CSSpeakerModelRetrainer retrainSpeakerModel:forVoiceTriggerAsset:]  (in CoreSpeech) + 320  [0x7fff66f495b3]
    +                   : 1 nd_initialize  (in VoiceTrigger) + 35  [0x7fff7b7bdab3]
    +                   :   1 IntNovDetect::initialize(char const*, char const*)  (in VoiceTrigger) + 2213  [0x7fff7b7c01e5]
    +                   :     1 NConfigSection::sOpt(NString const&) const  (in VoiceTrigger) + 86  [0x7fff7b7ff316]
    +                   :       1 NString::operator==(NString const&) const  (in VoiceTrigger) + 32  [0x7fff7b807250]
    +                   1 +[CSSpeakerModelRetrainer retrainSpeakerModel:forVoiceTriggerAsset:]  (in CoreSpeech) + 1391  [0x7fff66f499e2]
    +                     1 -[CSSpeakerModel enrollmentUtterance]  (in CoreSpeech) + 51  [0x7fff66f46d08]
    +                       1 -[CSSpeakerModel utteranceDirectory]  (in CoreSpeech) + 34  [0x7fff66f46c5a]
    +                         1 -[CSSpeakerModel _satPath]  (in CoreSpeech) + 62  [0x7fff66f46aca]
    +                           1 -[CSPreferences CSSATBasePath]  (in CoreSpeech) + 33  [0x7fff66f70671]
    +                             1 -[CSPreferences baseDir]  (in CoreSpeech) + 12  [0x7fff66f6ffda]
    +                               1 NSHomeDirectoryForUser  (in Foundation) + 12  [0x7fff54781a29]
    +                                 1 _CFCopyHomeDirURLForUser  (in CoreFoundation) + 46  [0x7fff52429419]
    +                                   1 getenv  (in libsystem_c.dylib) + 54  [0x7fff7f719335]
    +                                     1 __findenv_locked  (in libsystem_c.dylib) + 59  [0x7fff7f719232]