title: Ocassional crash on the app start
body: <p>I'm getting very strange crash at the start of the app. My app spawns a lot of threads (over 500, most of them are related to PLPreheatItem, I can not paste full crash log here, cause stackoverflow has limit to 30K symbols).</p>
  
  <p>The problem is that I can not reproduce it on my device. Also it happens on clean install for my customer almost every run.</p>
  
  <p>I am using NSURLSession with background session and NSOperationQueue with 4 concurrent operations. These are the most weak parts as I think.</p>
  
  <p>Could someone suggest where do I need to dig. Cause I'm really have no idea what to do.</p>
  
  <p>Thank you.</p>
  
  <pre><code>Incident Identifier: 3808D96D-CAA3-4DC3-9278-B1DF7CEFEF9D
  CrashReporter Key:   0f11c86163cc36bdb756e72a5b65b3db93ad673d
  Hardware Model:      iPhone8,1
  Process:             ******** [1991]
  Path:                /private/var/containers/Bundle/Application/87DD6538-DE78-4B6A-9834-58FF8C2AE22F/********.app/********
  Identifier:          ********
  Version:             75 (1.1.8)
  Code Type:           ARM-64 (Native)
  Parent Process:      launchd [1]
  
  Date/Time:           2016-10-24 15:21:42.42 +0200
  Launch Time:         2016-10-24 15:21:37.37 +0200
  OS Version:          iOS 9.3.5 (13G36)
  Report Version:      105
  
  Exception Type:  EXC_BREAKPOINT (SIGTRAP)
  Exception Codes: 0x0000000000000001, 0x000000018171e7c4
  Triggered by Thread:  40
  
  Filtered syslog:
  None found
  
  Thread 0 name:  Dispatch queue: com.apple.main-thread
  Thread 0:
  0   libsystem_kernel.dylib          0x0000000181608fd8 mach_msg_trap + 8
  1   libsystem_kernel.dylib          0x0000000181608e54 mach_msg + 72
  2   CoreFoundation                  0x0000000181a40c60 __CFRunLoopServiceMachPort + 196
  3   CoreFoundation                  0x0000000181a3e964 __CFRunLoopRun + 1032
  4   CoreFoundation                  0x0000000181968c50 CFRunLoopRunSpecific + 384
  5   GraphicsServices                0x0000000183250088 GSEventRunModal + 180
  6   UIKit                           0x0000000186c56088 UIApplicationMain + 204
  7   MyApp                           0x00000001000e1430 main (main.m:14)
  8   libdyld.dylib                   0x00000001815068b8 start + 4
  
  Thread 1 name:  Dispatch queue: PLPreheatItem
  Thread 1:
  0   libsystem_kernel.dylib          0x000000018162441c __semwait_signal + 8
  1   libsystem_c.dylib               0x000000018154122c nanosleep + 212
  2   libsystem_c.dylib               0x00000001815aa0b8 sleep + 44
  3   libxpc.dylib                    0x0000000181733ca8 _waiting4memory + 16
  4   libxpc.dylib                    0x000000018171f6d4 _xpc_mach_port_allocate + 92
  5   libxpc.dylib                    0x000000018171f62c _xpc_connection_setup_reply_port + 40
  6   libxpc.dylib                    0x000000018171f5ac xpc_connection_send_message_with_reply + 108
  7   AssetsLibraryServices           0x000000018a6f2e18 -[PLGatekeeperClient cancelCPLDownloadImageDataWithVirtualTaskIdentifiers:completionHandler:] + 332
  8   PhotoLibraryServices            0x000000018af023d0 __59-[PLPreheatItem cancelPreheatRequestWithCompletionHandler:]_block_invoke + 252
  9   AssetsLibraryServices           0x000000018a6ec508 __pl_dispatch_async_block_invoke + 36
  10  libdispatch.dylib               0x00000001814d54bc _dispatch_call_block_and_release + 24
  11  libdispatch.dylib               0x00000001814d547c _dispatch_client_callout + 16
  12  libdispatch.dylib               0x00000001814e14c0 _dispatch_queue_drain + 864
  13  libdispatch.dylib               0x00000001814d8f80 _dispatch_queue_invoke + 464
  14  libdispatch.dylib               0x00000001814e3390 _dispatch_root_queue_drain + 728
  15  libdispatch.dylib               0x00000001814e30b0 _dispatch_worker_thread3 + 112
  16  libsystem_pthread.dylib         0x00000001816ed470 _pthread_wqthread + 1092
  17  libsystem_pthread.dylib         0x00000001816ed020 start_wqthread + 4
  
  Thread 2 name:  Dispatch queue: com.apple.libdispatch-manager
  Thread 2:
  0   libsystem_kernel.dylib          0x0000000181608fd8 mach_msg_trap + 8
  1   libsystem_kernel.dylib          0x0000000181608e54 mach_msg + 72
  2   libdispatch.dylib               0x00000001814e91dc _dispatch_mach_msg_send + 1716
  3   libdispatch.dylib               0x00000001814e94d8 _dispatch_mach_send_drain + 236
  4   libdispatch.dylib               0x00000001814e8968 _dispatch_mach_notify_merge + 308
  5   libdispatch.dylib               0x00000001814da204 _dispatch_mach_notify_send_possible + 28
  6   libdispatch.dylib               0x00000001814d5fec _Xmach_notify_send_possible + 52
  7   libdispatch.dylib               0x00000001814d5adc libdispatch_internal_protocol_server + 104
  8   libdispatch.dylib               0x00000001814ecfdc _dispatch_mach_notify_source_invoke + 28
  9   libdispatch.dylib               0x00000001814edd48 _dispatch_kevent_mach_msg_recv + 280
  10  libdispatch.dylib               0x00000001814e8730 _dispatch_mgr_invoke + 64
  11  libdispatch.dylib               0x00000001814d7648 _dispatch_source_invoke + 0
  
  Thread 3 name:  Dispatch queue: PLPreheatItem
  Thread 3:
  0   libsystem_kernel.dylib          0x000000018162441c __semwait_signal + 8
  1   libsystem_c.dylib               0x000000018154122c nanosleep + 212
  2   libsystem_c.dylib               0x00000001815aa0b8 sleep + 44
  3   libxpc.dylib                    0x0000000181733ca8 _waiting4memory + 16
  4   libxpc.dylib                    0x000000018171f6d4 _xpc_mach_port_allocate + 92
  5   libxpc.dylib                    0x000000018171f62c _xpc_connection_setup_reply_port + 40
  6   libxpc.dylib                    0x000000018171f5ac xpc_connection_send_message_with_reply + 108
  7   AssetsLibraryServices           0x000000018a6f2e18 -[PLGatekeeperClient cancelCPLDownloadImageDataWithVirtualTaskIdentifiers:completionHandler:] + 332
  8   PhotoLibraryServices            0x000000018af023d0 __59-[PLPreheatItem cancelPreheatRequestWithCompletionHandler:]_block_invoke + 252
  9   AssetsLibraryServices           0x000000018a6ec508 __pl_dispatch_async_block_invoke + 36
  10  libdispatch.dylib               0x00000001814d54bc _dispatch_call_block_and_release + 24
  11  libdispatch.dylib               0x00000001814d547c _dispatch_client_callout + 16
  12  libdispatch.dylib               0x00000001814e14c0 _dispatch_queue_drain + 864
  13  libdispatch.dylib               0x00000001814d8f80 _dispatch_queue_invoke + 464
  14  libdispatch.dylib               0x00000001814e3390 _dispatch_root_queue_drain + 728
  15  libdispatch.dylib               0x00000001814e30b0 _dispatch_worker_thread3 + 112
  16  libsystem_pthread.dylib         0x00000001816ed470 _pthread_wqthread + 1092
  17  libsystem_pthread.dylib         0x00000001816ed020 start_wqthread + 4
  
  Thread 4 name:  Dispatch queue: PLPreheatItem
  Thread 4:
  0   libsystem_kernel.dylib          0x000000018162441c __semwait_signal + 8
  1   libsystem_c.dylib               0x000000018154122c nanosleep + 212
  2   libsystem_c.dylib               0x00000001815aa0b8 sleep + 44
  3   libxpc.dylib                    0x0000000181733ca8 _waiting4memory + 16
  4   libxpc.dylib                    0x000000018171f6d4 _xpc_mach_port_allocate + 92
  5   libxpc.dylib                    0x000000018171f62c _xpc_connection_setup_reply_port + 40
  6   libxpc.dylib                    0x000000018171f5ac xpc_connection_send_message_with_reply + 108
  7   AssetsLibraryServices           0x000000018a6f2e18 -[PLGatekeeperClient cancelCPLDownloadImageDataWithVirtualTaskIdentifiers:completionHandler:] + 332
  8   PhotoLibraryServices            0x000000018af023d0 __59-[PLPreheatItem cancelPreheatRequestWithCompletionHandler:]_block_invoke + 252
  9   AssetsLibraryServices           0x000000018a6ec508 __pl_dispatch_async_block_invoke + 36
  10  libdispatch.dylib               0x00000001814d54bc _dispatch_call_block_and_release + 24
  11  libdispatch.dylib               0x00000001814d547c _dispatch_client_callout + 16
  12  libdispatch.dylib               0x00000001814e14c0 _dispatch_queue_drain + 864
  13  libdispatch.dylib               0x00000001814d8f80 _dispatch_queue_invoke + 464
  14  libdispatch.dylib               0x00000001814e3390 _dispatch_root_queue_drain + 728
  15  libdispatch.dylib               0x00000001814e30b0 _dispatch_worker_thread3 + 112
  16  libsystem_pthread.dylib         0x00000001816ed470 _pthread_wqthread + 1092
  17  libsystem_pthread.dylib         0x00000001816ed020 start_wqthread + 4
  
  Thread 5 name:  WebThread
  Thread 5:
  0   libsystem_kernel.dylib          0x0000000181608fd8 mach_msg_trap + 8
  1   libsystem_kernel.dylib          0x0000000181608e54 mach_msg + 72
  2   CoreFoundation                  0x0000000181a40c60 __CFRunLoopServiceMachPort + 196
  3   CoreFoundation                  0x0000000181a3e964 __CFRunLoopRun + 1032
  4   CoreFoundation                  0x0000000181968c50 CFRunLoopRunSpecific + 384
  5   WebCore                         0x000000018595a108 RunWebThread(void*) + 456
  6   libsystem_pthread.dylib         0x00000001816efb28 _pthread_body + 156
  7   libsystem_pthread.dylib         0x00000001816efa8c _pthread_body + 0
  8   libsystem_pthread.dylib         0x00000001816ed028 thread_start + 4
  
  Thread 6:
  0   libsystem_kernel.dylib          0x0000000181624b48 __workq_kernreturn + 8
  1   libsystem_pthread.dylib         0x00000001816ed530 _pthread_wqthread + 1284
  2   libsystem_pthread.dylib         0x00000001816ed020 start_wqthread + 4
  Thread 8:
  0   libsystem_kernel.dylib          0x0000000181624b48 __workq_kernreturn + 8
  1   libsystem_pthread.dylib         0x00000001816ed530 _pthread_wqthread + 1284
  2   libsystem_pthread.dylib         0x00000001816ed020 start_wqthread + 4
  
  Thread 9 name:  com.apple.NSURLConnectionLoader
  Thread 9:
  0   libsystem_kernel.dylib          0x0000000181608fd8 mach_msg_trap + 8
  1   libsystem_kernel.dylib          0x0000000181608e54 mach_msg + 72
  2   CoreFoundation                  0x0000000181a40c60 __CFRunLoopServiceMachPort + 196
  3   CoreFoundation                  0x0000000181a3e964 __CFRunLoopRun + 1032
  4   CoreFoundation                  0x0000000181968c50 CFRunLoopRunSpecific + 384
  5   CFNetwork                       0x00000001820e9bcc +[NSURLConnection(Loader) _resourceLoadLoop:] + 412
  6   Foundation                      0x000000018245fe4c __NSThread__start__ + 1000
  7   libsystem_pthread.dylib         0x00000001816efb28 _pthread_body + 156
  8   libsystem_pthread.dylib         0x00000001816efa8c _pthread_body + 0
  9   libsystem_pthread.dylib         0x00000001816ed028 thread_start + 4
  
  Thread 10 name:  com.apple.CFSocket.private
  Thread 10:
  0   libsystem_kernel.dylib          0x0000000181624344 __select + 8
  1   CoreFoundation                  0x0000000181a471c8 __CFSocketManager + 648
  2   libsystem_pthread.dylib         0x00000001816efb28 _pthread_body + 156
  3   libsystem_pthread.dylib         0x00000001816efa8c _pthread_body + 0
  4   libsystem_pthread.dylib         0x00000001816ed028 thread_start + 4
  
  Thread 11:
  0   libsystem_kernel.dylib          0x0000000181624b48 __workq_kernreturn + 8
  1   libsystem_pthread.dylib         0x00000001816ed530 _pthread_wqthread + 1284
  2   libsystem_pthread.dylib         0x00000001816ed020 start_wqthread + 4
  
  Thread 12 name:  Dispatch queue: PLPreheatItem
  Thread 12:
  0   libsystem_kernel.dylib          0x000000018162441c __semwait_signal + 8
  1   libsystem_c.dylib               0x000000018154122c nanosleep + 212
  2   libsystem_c.dylib               0x00000001815aa0b8 sleep + 44
  3   libxpc.dylib                    0x0000000181733ca8 _waiting4memory + 16
  4   libxpc.dylib                    0x000000018171f6d4 _xpc_mach_port_allocate + 92
  5   libxpc.dylib                    0x000000018171f62c _xpc_connection_setup_reply_port + 40
  6   libxpc.dylib                    0x000000018171f5ac xpc_connection_send_message_with_reply + 108
  7   AssetsLibraryServices           0x000000018a6f2e18 -[PLGatekeeperClient cancelCPLDownloadImageDataWithVirtualTaskIdentifiers:completionHandler:] + 332
  8   PhotoLibraryServices            0x000000018af023d0 __59-[PLPreheatItem cancelPreheatRequestWithCompletionHandler:]_block_invoke + 252
  9   AssetsLibraryServices           0x000000018a6ec508 __pl_dispatch_async_block_invoke + 36
  10  libdispatch.dylib               0x00000001814d54bc _dispatch_call_block_and_release + 24
  11  libdispatch.dylib               0x00000001814d547c _dispatch_client_callout + 16
  12  libdispatch.dylib               0x00000001814e14c0 _dispatch_queue_drain + 864
  13  libdispatch.dylib               0x00000001814d8f80 _dispatch_queue_invoke + 464
  14  libdispatch.dylib               0x00000001814e3390 _dispatch_root_queue_drain + 728
  15  libdispatch.dylib               0x00000001814e30b0 _dispatch_worker_thread3 + 112
  16  libsystem_pthread.dylib         0x00000001816ed470 _pthread_wqthread + 1092
  17  libsystem_pthread.dylib         0x00000001816ed020 start_wqthread + 4
  
  Thread 13 name:  Dispatch queue: PLPreheatItem
  Thread 13:
  0   libsystem_kernel.dylib          0x000000018162441c __semwait_signal + 8
  1   libsystem_c.dylib               0x000000018154122c nanosleep + 212
  2   libsystem_c.dylib               0x00000001815aa0b8 sleep + 44
  3   libxpc.dylib                    0x0000000181733ca8 _waiting4memory + 16
  4   libxpc.dylib                    0x000000018171f6d4 _xpc_mach_port_allocate + 92
  5   libxpc.dylib                    0x000000018171f62c _xpc_connection_setup_reply_port + 40
  6   libxpc.dylib                    0x000000018171f5ac xpc_connection_send_message_with_reply + 108
  7   AssetsLibraryServices           0x000000018a6f2e18 -[PLGatekeeperClient cancelCPLDownloadImageDataWithVirtualTaskIdentifiers:completionHandler:] + 332
  8   PhotoLibraryServices            0x000000018af023d0 __59-[PLPreheatItem cancelPreheatRequestWithCompletionHandler:]_block_invoke + 252
  9   AssetsLibraryServices           0x000000018a6ec508 __pl_dispatch_async_block_invoke + 36
  10  libdispatch.dylib               0x00000001814d54bc _dispatch_call_block_and_release + 24
  11  libdispatch.dylib               0x00000001814d547c _dispatch_client_callout + 16
  12  libdispatch.dylib               0x00000001814e14c0 _dispatch_queue_drain + 864
  13  libdispatch.dylib               0x00000001814d8f80 _dispatch_queue_invoke + 464
  14  libdispatch.dylib               0x00000001814e3390 _dispatch_root_queue_drain + 728
  15  libdispatch.dylib               0x00000001814e30b0 _dispatch_worker_thread3 + 112
  16  libsystem_pthread.dylib         0x00000001816ed470 _pthread_wqthread + 1092
  17  libsystem_pthread.dylib         0x00000001816ed020 start_wqthread + 4
  
  Thread 14:
  0   libsystem_kernel.dylib          0x0000000181624b48 __workq_kernreturn + 8
  1   libsystem_pthread.dylib         0x00000001816ed530 _pthread_wqthread + 1284
  2   libsystem_pthread.dylib         0x00000001816ed020 start_wqthread + 4
  
  Thread 15 name:  Dispatch queue: PLPreheatItem
  Thread 15:
  0   libsystem_kernel.dylib          0x000000018162441c __semwait_signal + 8
  1   libsystem_c.dylib               0x000000018154122c nanosleep + 212
  2   libsystem_c.dylib               0x00000001815aa0b8 sleep + 44
  3   libxpc.dylib                    0x0000000181733ca8 _waiting4memory + 16
  4   libxpc.dylib                    0x000000018171f6d4 _xpc_mach_port_allocate + 92
  5   libxpc.dylib                    0x000000018171f62c _xpc_connection_setup_reply_port + 40
  6   libxpc.dylib                    0x000000018171f5ac xpc_connection_send_message_with_reply + 108
  7   AssetsLibraryServices           0x000000018a6f2e18 -[PLGatekeeperClient cancelCPLDownloadImageDataWithVirtualTaskIdentifiers:completionHandler:] + 332
  8   PhotoLibraryServices            0x000000018af023d0 __59-[PLPreheatItem cancelPreheatRequestWithCompletionHandler:]_block_invoke + 252
  9   AssetsLibraryServices           0x000000018a6ec508 __pl_dispatch_async_block_invoke + 36
  10  libdispatch.dylib               0x00000001814d54bc _dispatch_call_block_and_release + 24
  11  libdispatch.dylib               0x00000001814d547c _dispatch_client_callout + 16
  12  libdispatch.dylib               0x00000001814e14c0 _dispatch_queue_drain + 864
  13  libdispatch.dylib               0x00000001814d8f80 _dispatch_queue_invoke + 464
  14  libdispatch.dylib               0x00000001814e3390 _dispatch_root_queue_drain + 728
  15  libdispatch.dylib               0x00000001814e30b0 _dispatch_worker_thread3 + 112
  16  libsystem_pthread.dylib         0x00000001816ed470 _pthread_wqthread + 1092
  17  libsystem_pthread.dylib         0x00000001816ed020 start_wqthread + 4
  
  Thread 16:
  0   libsystem_kernel.dylib          0x0000000181624b48 __workq_kernreturn + 8
  1   libsystem_pthread.dylib         0x00000001816ed530 _pthread_wqthread + 1284
  2   libsystem_pthread.dylib         0x00000001816ed020 start_wqthread + 4
  
  Thread 17:
  0   libsystem_kernel.dylib          0x0000000181624b48 __workq_kernreturn + 8
  1   libsystem_pthread.dylib         0x00000001816ed530 _pthread_wqthread + 1284
  2   libsystem_pthread.dylib         0x00000001816ed020 start_wqthread + 4
  
  Thread 18:
  0   libsystem_kernel.dylib          0x0000000181624b48 __workq_kernreturn + 8
  1   libsystem_pthread.dylib         0x00000001816ed530 _pthread_wqthread + 1284
  2   libsystem_pthread.dylib         0x00000001816ed020 start_wqthread + 4
  
  Thread 19:
  0   libsystem_kernel.dylib          0x0000000181624b48 __workq_kernreturn + 8
  1   libsystem_pthread.dylib         0x00000001816ed530 _pthread_wqthread + 1284
  2   libsystem_pthread.dylib         0x00000001816ed020 start_wqthread + 4
  
  Thread 20:
  0   libsystem_kernel.dylib          0x0000000181624b48 __workq_kernreturn + 8
  1   libsystem_pthread.dylib         0x00000001816ed530 _pthread_wqthread + 1284
  2   libsystem_pthread.dylib         0x00000001816ed020 start_wqthread + 4
  
  Thread 21 name:  Dispatch queue: PLPreheatItem
  Thread 21:
  0   libsystem_kernel.dylib          0x000000018162441c __semwait_signal + 8
  1   libsystem_c.dylib               0x000000018154122c nanosleep + 212
  2   libsystem_c.dylib               0x00000001815aa0b8 sleep + 44
  3   libxpc.dylib                    0x0000000181733ca8 _waiting4memory + 16
  4   libxpc.dylib                    0x000000018171f6d4 _xpc_mach_port_allocate + 92
  5   libxpc.dylib                    0x000000018171f62c _xpc_connection_setup_reply_port + 40
  6   libxpc.dylib                    0x000000018171f5ac xpc_connection_send_message_with_reply + 108
  7   AssetsLibraryServices           0x000000018a6f2e18 -[PLGatekeeperClient cancelCPLDownloadImageDataWithVirtualTaskIdentifiers:completionHandler:] + 332
  8   PhotoLibraryServices            0x000000018af023d0 __59-[PLPreheatItem cancelPreheatRequestWithCompletionHandler:]_block_invoke + 252
  9   AssetsLibraryServices           0x000000018a6ec508 __pl_dispatch_async_block_invoke + 36
  10  libdispatch.dylib               0x00000001814d54bc _dispatch_call_block_and_release + 24
  11  libdispatch.dylib               0x00000001814d547c _dispatch_client_callout + 16
  12  libdispatch.dylib               0x00000001814e14c0 _dispatch_queue_drain + 864
  13  libdispatch.dylib               0x00000001814d8f80 _dispatch_queue_invoke + 464
  14  libdispatch.dylib               0x00000001814e3390 _dispatch_root_queue_drain + 728
  15  libdispatch.dylib               0x00000001814e30b0 _dispatch_worker_thread3 + 112
  16  libsystem_pthread.dylib         0x00000001816ed470 _pthread_wqthread + 1092
  17  libsystem_pthread.dylib         0x00000001816ed020 start_wqthread + 4
  
  Thread 22:
  0   libsystem_kernel.dylib          0x0000000181624b48 __workq_kernreturn + 8
  1   libsystem_pthread.dylib         0x00000001816ed530 _pthread_wqthread + 1284
  2   libsystem_pthread.dylib         0x00000001816ed020 start_wqthread + 4
  
  Thread 23 name:  Dispatch queue: PLPreheatItem
  Thread 23:
  0   libsystem_kernel.dylib          0x0000000181623f6c __psynch_mutexwait + 8
  1   libsystem_pthread.dylib         0x00000001816f239c _pthread_mutex_lock_wait + 96
  2   libsystem_pthread.dylib         0x00000001816f257c _pthread_mutex_lock_slow + 296
  3   libsystem_c.dylib               0x000000018153b77c vfprintf_l + 36
  4   libsystem_c.dylib               0x000000018153b748 fprintf + 76
  5   libsystem_c.dylib               0x00000001815411ec nanosleep + 148
  6   libsystem_c.dylib               0x00000001815aa0b8 sleep + 44
  7   libxpc.dylib                    0x0000000181733ca8 _waiting4memory + 16
  8   libxpc.dylib                    0x000000018171f6d4 _xpc_mach_port_allocate + 92
  9   libxpc.dylib                    0x000000018171f62c _xpc_connection_setup_reply_port + 40
  10  libxpc.dylib                    0x000000018171f5ac xpc_connection_send_message_with_reply + 108
  11  AssetsLibraryServices           0x000000018a6f2e18 -[PLGatekeeperClient cancelCPLDownloadImageDataWithVirtualTaskIdentifiers:completionHandler:] + 332
  12  PhotoLibraryServices            0x000000018af023d0 __59-[PLPreheatItem cancelPreheatRequestWithCompletionHandler:]_block_invoke + 252
  13  AssetsLibraryServices           0x000000018a6ec508 __pl_dispatch_async_block_invoke + 36
  14  libdispatch.dylib               0x00000001814d54bc _dispatch_call_block_and_release + 24
  15  libdispatch.dylib               0x00000001814d547c _dispatch_client_callout + 16
  16  libdispatch.dylib               0x00000001814e14c0 _dispatch_queue_drain + 864
  17  libdispatch.dylib               0x00000001814d8f80 _dispatch_queue_invoke + 464
  18  libdispatch.dylib               0x00000001814e3390 _dispatch_root_queue_drain + 728
  19  libdispatch.dylib               0x00000001814e30b0 _dispatch_worker_thread3 + 112
  20  libsystem_pthread.dylib         0x00000001816ed470 _pthread_wqthread + 1092
  21  libsystem_pthread.dylib         0x00000001816ed020 start_wqthread + 4
  
  Thread 24:
  0   libsystem_kernel.dylib          0x0000000181624b48 __workq_kernreturn + 8
  1   libsystem_pthread.dylib         0x00000001816ed530 _pthread_wqthread + 1284
  2   libsystem_pthread.dylib         0x00000001816ed020 start_wqthread + 4
  Thread 36 name:  Dispatch queue: PLPreheatItem
  Thread 36:
  0   libsystem_kernel.dylib          0x000000018162441c __semwait_signal + 8
  1   libsystem_c.dylib               0x000000018154122c nanosleep + 212
  2   libsystem_c.dylib               0x00000001815aa0b8 sleep + 44
  3   libxpc.dylib                    0x0000000181733ca8 _waiting4memory + 16
  4   libxpc.dylib                    0x000000018171f6d4 _xpc_mach_port_allocate + 92
  5   libxpc.dylib                    0x000000018171f62c _xpc_connection_setup_reply_port + 40
  6   libxpc.dylib                    0x000000018171f5ac xpc_connection_send_message_with_reply + 108
  7   AssetsLibraryServices           0x000000018a6f2e18 -[PLGatekeeperClient cancelCPLDownloadImageDataWithVirtualTaskIdentifiers:completionHandler:] + 332
  8   PhotoLibraryServices            0x000000018af023d0 __59-[PLPreheatItem cancelPreheatRequestWithCompletionHandler:]_block_invoke + 252
  9   AssetsLibraryServices           0x000000018a6ec508 __pl_dispatch_async_block_invoke + 36
  10  libdispatch.dylib               0x00000001814d54bc _dispatch_call_block_and_release + 24
  11  libdispatch.dylib               0x00000001814d547c _dispatch_client_callout + 16
  12  libdispatch.dylib               0x00000001814e14c0 _dispatch_queue_drain + 864
  13  libdispatch.dylib               0x00000001814d8f80 _dispatch_queue_invoke + 464
  14  libdispatch.dylib               0x00000001814e3390 _dispatch_root_queue_drain + 728
  15  libdispatch.dylib               0x00000001814e30b0 _dispatch_worker_thread3 + 112
  16  libsystem_pthread.dylib         0x00000001816ed470 _pthread_wqthread + 1092
  17  libsystem_pthread.dylib         0x00000001816ed020 start_wqthread + 4
  
  Thread 37 name:  Dispatch queue: PLPreheatItem
  Thread 37:
  0   libsystem_kernel.dylib          0x000000018162441c __semwait_signal + 8
  1   libsystem_c.dylib               0x000000018154122c nanosleep + 212
  2   libsystem_c.dylib               0x00000001815aa0b8 sleep + 44
  3   libxpc.dylib                    0x0000000181733ca8 _waiting4memory + 16
  4   libxpc.dylib                    0x000000018171f6d4 _xpc_mach_port_allocate + 92
  5   libxpc.dylib                    0x000000018171f62c _xpc_connection_setup_reply_port + 40
  6   libxpc.dylib                    0x000000018171f5ac xpc_connection_send_message_with_reply + 108
  7   AssetsLibraryServices           0x000000018a6f2e18 -[PLGatekeeperClient cancelCPLDownloadImageDataWithVirtualTaskIdentifiers:completionHandler:] + 332
  8   PhotoLibraryServices            0x000000018af023d0 __59-[PLPreheatItem cancelPreheatRequestWithCompletionHandler:]_block_invoke + 252
  9   AssetsLibraryServices           0x000000018a6ec508 __pl_dispatch_async_block_invoke + 36
  10  libdispatch.dylib               0x00000001814d54bc _dispatch_call_block_and_release + 24
  11  libdispatch.dylib               0x00000001814d547c _dispatch_client_callout + 16
  12  libdispatch.dylib               0x00000001814e14c0 _dispatch_queue_drain + 864
  13  libdispatch.dylib               0x00000001814d8f80 _dispatch_queue_invoke + 464
  14  libdispatch.dylib               0x00000001814e3390 _dispatch_root_queue_drain + 728
  15  libdispatch.dylib               0x00000001814e30b0 _dispatch_worker_thread3 + 112
  16  libsystem_pthread.dylib         0x00000001816ed470 _pthread_wqthread + 1092
  17  libsystem_pthread.dylib         0x00000001816ed020 start_wqthread + 4
  
  Thread 38:
  0   libsystem_kernel.dylib          0x0000000181624b48 __workq_kernreturn + 8
  1   libsystem_pthread.dylib         0x00000001816ed530 _pthread_wqthread + 1284
  2   libsystem_pthread.dylib         0x00000001816ed020 start_wqthread + 4
  
  Thread 39:
  0   libsystem_kernel.dylib          0x0000000181624b48 __workq_kernreturn + 8
  1   libsystem_pthread.dylib         0x00000001816ed530 _pthread_wqthread + 1284
  2   libsystem_pthread.dylib         0x00000001816ed020 start_wqthread + 4
  
  Thread 40 name:  Kernel bug: The kernel cannot allocate memory needed for the ps  Dispatch queue: com.apple.root.default-qos
  Thread 40 Crashed:
  0   libxpc.dylib                    0x000000018171e7c4 _xpc_connection_mach_event + 776
  1   libxpc.dylib                    0x000000018171e7c4 _xpc_connection_mach_event + 776
  2   libdispatch.dylib               0x00000001814d5578 _dispatch_client_callout4 + 16
  3   libdispatch.dylib               0x00000001814d9864 _dispatch_mach_msg_invoke + 656
  4   libdispatch.dylib               0x00000001814e1694 _dispatch_queue_drain + 1332
  5   libdispatch.dylib               0x00000001814d8978 _dispatch_mach_invoke + 600
  6   libdispatch.dylib               0x00000001814d547c _dispatch_client_callout + 16
  7   libdispatch.dylib               0x00000001814e3914 _dispatch_root_queue_drain + 2140
  8   libdispatch.dylib               0x00000001814e30b0 _dispatch_worker_thread3 + 112
  9   libsystem_pthread.dylib         0x00000001816ed470 _pthread_wqthread + 1092
  10  libsystem_pthread.dylib         0x00000001816ed020 start_wqthread + 4
  
  Activity ID:             0x0000000000156343
  Activity Name:           starting resolver activity
  Activity Image Path:     /usr/lib/system/libsystem_network.dylib
  Activity Image UUID:     A8E4200A-ECC7-3E56-A845-8A0E9CB4A6F0
  Activity Offset:         0x0003333c
  Activity Running Time:   5.357751 sec
  </code></pre>