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I am getting a SIGTRAP crash.App receive SIGTRAP and crash at os_unfair_lock_unowned_unlock, it looks like `@synchronized` cause SIGTRAP happen.This crash only happens in iOS 12; iOS 11 & 10 is free.The App is download from AppStore, why can a release app receive a debug signal SIGTRAP ? And how to fix this crash ?Crash Detail:Hardware Model: iPhone7,2Process: LizhiFM [1673]Path: /private/var/containers/Bundle/Application/6170A78F-5047-4B3F-8AD0-7E4E6133F6F0/LizhiFM.app/LizhiFMIdentifier: com.lizhi.lizhifmVersion: 134664 (5.0.1)AppStoreTools: 10E121aAppVariant: 1:iPhone7,2:12.2Code Type: ARM-64 (Native)Role: Non UIParent Process: launchd [1]Coalition: com.lizhi.lizhifm [606]Date/Time: 2019-06-04 18:27:01.8431 +0800Launch Time: 2019-06-04 18:26:55.7277 +0800OS Version: iPhone OS 12.2 (16E227)Baseband Version: 7.55.01Report Version: 104Exception Type: EXC_BREAKPOINT (SIGTRAP)Exception Codes: 0x0000000000000001, 0x00000001a8dfa04cTermination Signal: Trace/BPT trap: 5Termination Reason: Namespace SIGNAL, Code 0x5Terminating Process: exc handler [1673]Triggered by Thread: 28Thread 0 name:Thread 0:0 libsystem_kernel.dylib 0x00000001a8d8a9d4 __ulock_wait + 81 libsystem_platform.dylib 0x00000001a8dfb348 _os_unfair_lock_lock_slow + 2202 libobjc.A.dylib 0x00000001a83daf6c objc_sync_enter + 32 (lock_private.h:437)3 LizhiFM 0x0000000101a86ef0 -[LZDBAccessor select:param:processor:] + 92 (LZDBAccessor.m:135)4 LizhiFM 0x0000000101a86e4c -[LZDBAccessor locate:param:processor:] + 24 (LZDBAccessor.m:116)5 LizhiFM 0x0000000101a87940 -[LZDBAccessor getIntValue:param:] + 28 (LZDBAccessor.m:350)6 LizhiFM 0x0000000101dceb08 -[LZConversationDao totalUnreadCountWithSessionId:types:] + 596 (LZConversationDao.m:460)7 LizhiFM 0x0000000101dd0964 -[LZConversationMgr totalUnreadCountWithTypes:] + 140 (LZConversationMgr.m:197)8 LizhiFM 0x00000001011a8c34 -[LZConversationService totalUnreadCountWithTypes:] + 84 (LZConversationService.m:93)9 LizhiFM 0x0000000101de5be4 -[LZMessageNotifyMgrService getChatMessageCount] + 292 (LZMessageNotifyMgrService.m:114)10 LizhiFM 0x0000000101de5c4c -[LZMessageNotifyMgrService getMessageAllCount] + 32 (LZMessageNotifyMgrService.m:120)11 LizhiFM 0x0000000101f600b4 -[LZMainTabBarManager updateMyItemBarBadge] + 140 (LZMainTabBarManager.m:228)12 LizhiFM 0x0000000101f5d22c -[LZMainTabBarController viewDidAppear:] + 88 (LZMainTabBarController.m:87)13 LizhiFM 0x00000001037f9a90 -[_priv_NBSUIHookMatrix nbs_jump_viewDidAppear:origIMP:superClass:] + 169614 UIKitCore 0x00000001d50480f4 -[UIViewController _setViewAppearState:isAnimating:] + 808 (UIViewController.m:4520)15 UIKitCore 0x00000001d504aa28 __64-[UIViewController viewDidMoveToWindow:shouldAppearOrDisappear:]_block_invoke + 44 (UIViewController.m:5104)16 UIKitCore 0x00000001d5049094 -[UIViewController _executeAfterAppearanceBlock] + 88 (UIViewController.m:4842)17 UIKitCore 0x00000001d55f70e8 _runAfterCACommitDeferredBlocks + 564 (UIApplication.m:2759)18 UIKitCore 0x00000001d55e5b2c _cleanUpAfterCAFlushAndRunDeferredBlocks + 352 (UIApplication.m:2728)19 UIKitCore 0x00000001d5612744 _afterCACommitHandler + 116 (UIApplication.m:2780)20 CoreFoundation 0x00000001a917d89c __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 32 (CFRunLoop.c:1822)21 CoreFoundation 0x00000001a91785c4 __CFRunLoopDoObservers + 412 (CFRunLoop.c:1932)22 CoreFoundation 0x00000001a9178b40 __CFRunLoopRun + 1228 (CFRunLoop.c:2950)23 CoreFoundation 0x00000001a9178354 CFRunLoopRunSpecific + 436 (CFRunLoop.c:3247)24 GraphicsServices 0x00000001ab37879c GSEventRunModal + 104 (GSEvent.c:2245)25 UIKitCore 0x00000001d55ebb68 UIApplicationMain + 212 (UIApplication.m:4353)26 LizhiFM 0x0000000101173d64 main + 88 (main.m:25)27 libdyld.dylib 0x00000001a8c3e8e0 start + 4Thread 10 name:Thread 10:0 libsystem_kernel.dylib 0x00000001a8d8a9d4 __ulock_wait + 81 libsystem_platform.dylib 0x00000001a8dfb348 _os_unfair_lock_lock_slow + 2202 libobjc.A.dylib 0x00000001a83daf6c objc_sync_enter + 32 (lock_private.h:437)3 LizhiFM 0x0000000101a86ef0 -[LZDBAccessor select:param:processor:] + 92 (LZDBAccessor.m:135)4 LizhiFM 0x0000000101a80244 -[LZBaseDao loadCondition:condition:] + 760 (LZBaseDao.m:197)5 LizhiFM 0x0000000101a7ebfc -[KeyValueStoreMgr getValueWithKey:defaultValue:xid:] + 216 (KeyValueStoreMgr.m:260)6 LizhiFM 0x00000001020379a8 -[KeyValueStoreMgr(Config) getCheckSubapp] + 68 (KeyValueStoreMgr+Config.m:170)7 LizhiFM 0x0000000101265dbc -[LZLaunchTaskMgr reportSubappTransform] + 76 (LZLaunchTaskMgr.m:1158)8 LizhiFM 0x00000001012643ec -[LZLaunchTaskMgr initComponentsOnGloabalThread] + 40 (LZLaunchTaskMgr.m:867)9 Foundation 0x00000001a9c728d4 __NSThreadPerformPerform + 336 (NSThread.m:1259)10 CoreFoundation 0x00000001a917e2bc __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 24 (CFRunLoop.c:1980)11 CoreFoundation 0x00000001a917e23c __CFRunLoopDoSource0 + 88 (CFRunLoop.c:2015)12 CoreFoundation 0x00000001a917db24 __CFRunLoopDoSources0 + 176 (CFRunLoop.c:2051)13 CoreFoundation 0x00000001a9178a60 __CFRunLoopRun + 1004 (CFRunLoop.c:2922)14 CoreFoundation 0x00000001a9178354 CFRunLoopRunSpecific + 436 (CFRunLoop.c:3247)15 CoreFoundation 0x00000001a91790b0 CFRunLoopRun + 80 (CFRunLoop.c:3271)16 LizhiFM 0x0000000101f64bf4 +[LZThreadMgr runGlobalFunc] + 148 (LZThreadMgr.m:47)17 Foundation 0x00000001a9c726e4 __NSThread__start__ + 984 (NSThread.m:1175)18 libsystem_pthread.dylib 0x00000001a8e0c2c0 _pthread_body + 128 (pthread.c:857)19 libsystem_pthread.dylib 0x00000001a8e0c220 _pthread_start + 44 (pthread.c:884)20 libsystem_pthread.dylib 0x00000001a8e0fcdc thread_start + 4Thread 28 name:Thread 28 Crashed:0 libsystem_platform.dylib 0x00000001a8dfa04c _os_unfair_lock_unowned_abort + 36 (lock.c:525)1 libsystem_platform.dylib 0x00000001a8dfb4ec _os_unfair_lock_unlock_slow + 1442 libsqlite3.dylib 0x00000001a95e8124 fillInUnixFile + 460 (sqlite3.c:24953)3 libsqlite3.dylib 0x00000001a95e7d24 unixOpen + 1996 (sqlite3.c:42486)4 libsqlite3.dylib 0x00000001a964adf4 pager_write + 916 (sqlite3.c:22120)5 libsqlite3.dylib 0x00000001a964a5f0 sqlite3BtreeDelete + 780 (sqlite3.c:62327)6 libsqlite3.dylib 0x00000001a9627798 sqlite3VdbeExec + 17628 (sqlite3.c:93758)7 libsqlite3.dylib 0x00000001a9621d24 sqlite3_step + 444 (sqlite3.c:86839)8 LizhiFM 0x0000000101a87458 -[LZDBAccessor update:param:isInsert:] + 440 (LZDBAccessor.m:216)9 LizhiFM 0x0000000101a811d0 -[LZBaseDao updateRecord:condition:] + 692 (LZBaseDao.m:374)10 LizhiFM 0x0000000101a88918 -[LZKeyValueStoreDao commit:] + 180 (LZKeyValueStoreDao.m:55)11 LizhiFM 0x0000000101a7e5b4 __34-[KeyValueStoreMgr p_synchronize:]_block_invoke + 204 (KeyValueStoreMgr.m:155)12 CoreFoundation 0x00000001a90d67c0 -[__NSDictionaryM enumerateKeysAndObjectsWithOptions:usingBlock:] + 232 (NSDictionaryM_Common.h:310)13 LizhiFM 0x0000000101a7e718 __36-[KeyValueStoreMgr asyncSynchronize]_block_invoke + 168 (KeyValueStoreMgr.m:181)14 libdispatch.dylib 0x00000001a8c2ca38 _dispatch_call_block_and_release + 24 (init.c:1372)15 libdispatch.dylib 0x00000001a8c2d7d4 _dispatch_client_callout + 16 (object.m:511)16 libdispatch.dylib 0x00000001a8bd6320 _dispatch_lane_serial_drain$VARIANT$mp + 592 (inline_internal.h:2441)17 libdispatch.dylib 0x00000001a8bd6e3c _dispatch_lane_invoke$VARIANT$mp + 428 (queue.c:3805)18 libdispatch.dylib 0x00000001a8bdf4a8 _dispatch_workloop_worker_thread + 596 (queue.c:5889)19 libsystem_pthread.dylib 0x00000001a8e0d114 _pthread_wqthread + 304 (pthread.c:2371)20 libsystem_pthread.dylib 0x00000001a8e0fcd4 start_wqthread + 4Thread 32 name:Thread 32:0 libsystem_kernel.dylib 0x00000001a8d8a9d4 __ulock_wait + 81 libsystem_platform.dylib 0x00000001a8dfb348 _os_unfair_lock_lock_slow + 2202 libobjc.A.dylib 0x00000001a83daf6c objc_sync_enter + 32 (lock_private.h:437)3 LizhiFM 0x0000000101a86ef0 -[LZDBAccessor select:param:processor:] + 92 (LZDBAccessor.m:135)4 LizhiFM 0x0000000101a86e4c -[LZDBAccessor locate:param:processor:] + 24 (LZDBAccessor.m:116)5 LizhiFM 0x0000000101a87940 -[LZDBAccessor getIntValue:param:] + 28 (LZDBAccessor.m:350)6 LizhiFM 0x0000000101a80948 -[LZBaseDao recordExistWithCondition:] + 108 (LZBaseDao.m:276)7 LizhiFM 0x0000000102026d0c -[LZSessionDao commit:] + 172 (LZSessionDao.m:74)8 LizhiFM 0x0000000102027a88 -[LZSessionMgr(DataItem) setValue:key:] + 288 (LZSessionMgr+DataItem.m:27)9 LizhiFM 0x0000000101e7cd30 -[ITWhereToGoWhenRichScene onResponseWithNetId:errType:errCode:errMsg:packet:] + 544 (ITWhereToGoWhenRichScene.m:128)10 LizhiFM 0x00000001018f4494 -[ReqResp onResponseImplInThread:] + 44411 Foundation 0x00000001a9c728d4 __NSThreadPerformPerform + 336 (NSThread.m:1259)12 CoreFoundation 0x00000001a917e2bc __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 24 (CFRunLoop.c:1980)13 CoreFoundation 0x00000001a917e23c __CFRunLoopDoSource0 + 88 (CFRunLoop.c:2015)14 CoreFoundation 0x00000001a917db24 __CFRunLoopDoSources0 + 176 (CFRunLoop.c:2051)15 CoreFoundation 0x00000001a9178a60 __CFRunLoopRun + 1004 (CFRunLoop.c:2922)16 CoreFoundation 0x00000001a9178354 CFRunLoopRunSpecific + 436 (CFRunLoop.c:3247)17 CoreFoundation 0x00000001a91790b0 CFRunLoopRun + 80 (CFRunLoop.c:3271)18 LizhiFM 0x00000001018c7070 +[PodITNetLibrary_LZThreadMgr(Network) runNetSceneResponseFunc] + 14819 Foundation 0x00000001a9c726e4 __NSThread__start__ + 984 (NSThread.m:1175)20 libsystem_pthread.dylib 0x00000001a8e0c2c0 _pthread_body + 128 (pthread.c:857)21 libsystem_pthread.dylib 0x00000001a8e0c220 _pthread_start + 44 (pthread.c:884)22 libsystem_pthread.dylib 0x00000001a8e0fcdc thread_start + 4Thread 28 crashed with ARM Thread State (64-bit): x0: 0x0000000000000001 x1: 0x0000000000000000 x2: 0x000000000000f20b x3: 0x0000000000000000 x4: 0x0000000000000000 x5: 0x0000000000000000 x6: 0x0000000281ece480 x7: 0x0000000000000000 x8: 0x0000000000000001 x9: 0x00000002832dc850 x10: 0x0000000000000850 x11: 0x0000000000000000 x12: 0x0000000000000085 x13: 0x0000000000000001 x14: 0x0000000000000085 x15: 0x000000000000037a x16: 0x00000001a8dfb430 x17: 0x0000000011800000 x18: 0x0000000000000000 x19: 0x00000001dfd5db80 x20: 0x000000015a00d020 x21: 0x00000001d8b98a78 x22: 0x0000000000000030 x23: 0x0000000000000000 x24: 0x00000001dfd5f000 x25: 0x00000001dfd5cf40 x26: 0x00000001d8b98a78 x27: 0x00000001dfd5d120 x28: 0x0000000000000000 fp: 0x000000016fcc5020 lr: 0x00000001a8dfb4ec sp: 0x000000016fcc5010 pc: 0x00000001a8dfa04c cpsr: 0x00000000