应用程序启动时偶尔崩溃
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【中文标题】应用程序启动时偶尔崩溃【英文标题】：Ocassional crash on the app start 【发布时间】：2016-10-25 11:30:29 【问题描述】：我在应用程序启动时遇到了非常奇怪的崩溃。我的应用产生了很多线程（超过 500 个，其中大多数与 PLPreheatItem 相关，我无法在此处粘贴完整的崩溃日志，因为 *** 限制为 30K 个符号）。
问题是我无法在我的设备上重现它。几乎每次运行时，我的客户都会在全新安装时发生这种情况。
我正在使用带有后台会话的 NSURLSession 和带有 4 个并发操作的 NSOperationQueue。这些是我认为最薄弱的部分。
有人可以建议我需要在哪里挖掘。因为我真的不知道该怎么办。
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
【问题讨论】：
【参考方案1】：错误消息被截断。显然是“内核无法分配伪接收所需的内存。”
您可能遇到了设备可以同时处理的最大线程数。 500 个线程转换为大约半 GB 的 RAM，仅用于应用程序的线程堆栈，甚至在您构建堆或为屏幕分配后备存储之前。在具有 512 MB RAM 的设备（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）上，无需祈祷它会工作。即使在较新的设备上，这也是可怕的滥用行为。
看起来这是由您使用 Apple 的照片框架执行的操作触发的。如果你正在做一些涉及查看大量图片或其他东西的元数据的事情，你应该添加延迟或其他东西来限制你这样做的速度。除此之外，除了在 bugreport.apple.com 上提交错误报告并希望获得最好的结果之外，您可能无能为力。
【讨论】：
【参考方案2】：好的，看来问题已经解决了。
在应用程序开始时，我创建了PHCachingImageManager 并调用了startCachingImagesForAssets:targetSize:contentMode:options:。我正在为用户拥有的所有 iCloud 资产执行此操作，因此如果您有很多资产要缓存，请小心立即开始缓存所有资产。
结果PHCachingImageManager在串行队列中分别为每个资产生成了数十个线程。 （我的客户超过 500 个）。所以应用程序最终内存不足。
这是人们为此做的解决方法：How to use PHCachingImageManager
【讨论】：
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