我在应用程序启动时遇到了非常奇怪的崩溃。我的应用程序产生了很多线程（超过500个，大多数都与PLPreheatItem有关，我不能在这里粘贴完整的崩溃日志，导致stackoverflow限制为30K符号）。
问题是我无法在我的设备上重现它。此外，它几乎每次运行都会在我的客户的干净安装中发生。
我正在使用带有后台会话的NSURLSession和带有4个并发操作的NSOperationQueue。这些是我认为最脆弱的部分。
有人可以建议我在哪里挖掘。因为我真的不知道该怎么做。
谢谢。
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
答案 0 :(得分：0)
错误消息被截断。显然＆＃34;内核无法分配伪接收所需的内存。＆＃34;
您可能遇到设备可以同时处理的最大线程数。在您构建堆或为屏幕分配后备存储之前，500个线程仅为您的应用程序的线程堆栈转换为大约半千兆字节的RAM。在具有512 MB RAM（iPhone 4S及更低版本，iPod Touch第5代及更低版本，iPad 2及更早版本，iPad Mini第1代及更早版本）的设备上，没有任何祈祷可以使用。即使在较新的设备上，这也是可怕的辱骂。
看起来这是由您在Apple的照片框架中所做的事情引发的。如果您正在执行涉及查看大量图片或其他内容的元数据的内容，则应添加延迟或某些内容以限制执行此操作的速率。除此之外，除了在bugreport.apple.com上提交错误报告并希望获得最佳效果之外，您可能无能为力。
答案 1 :(得分：0)
好的，问题似乎已经解决了。
在应用开始时，我创建了PHCachingImageManager并致电startCachingImagesForAssets:targetSize:contentMode:options:。我正在为用户拥有的所有iCloud资产执行此操作，因此，如果您有很多要缓存的资产，请注意立即开始缓存所有这些资产。
结果PHCachingImageManager分别为每个资产在串行队列中产生了数十个线程。 （我的客户超过500）。因此应用程序最终耗尽内存。
以下是人们为此做的解决方法：How to use PHCachingImageManager