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CoreData error on mergeChangesFromContextDidSaveNotification: invalid Summary

background first:

I have a singleton that does all of my CoreData related stuff. It receives a call from multiple threads. For each thread, I create a new MOC, always using the same StoreCoordinator. I have two fetchedResultsController that needs to be updated immediately after changing data in another thread. To merge the changes, I call addControllerContextDidSave: as in the demo application Books.

 - (void)addControllerContextDidSave:(NSNotification*)saveNotification { if (saveNotification) { NSManagedObjectContext *fahrzeugeContext = [fetchedFahrzeuge managedObjectContext]; NSManagedObjectContext *accountContext = [fetchedAccount managedObjectContext]; // Merging changes causes the fetched results controller to update its results @try { if (fahrzeugeContext) [fahrzeugeContext mergeChangesFromContextDidSaveNotification:saveNotification]; if (accountContext) [accountContext mergeChangesFromContextDidSaveNotification:saveNotification]; } @catch (NSException * e) {NSLog(@"Merge Notification Error: %@", e);} } }

In some really rare cases, the application crashes with EXC_BAD_ACCESS in the line mergeChangesFromContextDidSaveNotification: saying that saveNotification has an invalid Summary . (even try-catch block doesn't work)
This only happens in really, very rare situations (for example, once a week), so I can not check it correctly.

What could be the cause of this and more important how to fix it. Now I am testing if (saveNotification) {} , but again it may take some time until it repeats.

enter image description here

.

EDIT: Found old device failure log:

 Incident Identifier: 655DB451-81C1-41A6-942C-F54DD9F40FCC CrashReporter Key: 2495494089df0a2b47c6283c14ad5f8e7895fbbe Hardware Model: iPhone1,2 Process: MyApp [648] Path: /var/mobile/Applications/43E12C67-7D7D-4F30-A7E3-D83DDE0FDCC1/MyApp.app/MyApp Identifier: MyApp Version: ??? (???) Code Type: ARM (Native) Parent Process: launchd [1] Date/Time: 2011-02-25 13:33:30.232 +0100 OS Version: iPhone OS 4.2.1 (8C148) Report Version: 104 Exception Type: EXC_BAD_ACCESS (SIGBUS) Exception Codes: KERN_PROTECTION_FAILURE at 0x00000004 Crashed Thread: 8 Thread 0: 0 libSystem.B.dylib 0x35d5b4a0 swtch_pri + 8 1 libSystem.B.dylib 0x35de59c8 sched_yield + 8 2 UIKit 0x35a60c18 -[UITableView(_UITableViewPrivate) _smoothScroll:] + 20 3 UIKit 0x35a4a4a0 ScrollerHeartbeatCallback + 100 4 GraphicsServices 0x33e79a3c HeartbeatVBLCallback + 152 5 IOMobileFramebuffer 0x3027d864 IOMobileFramebufferVsyncNotifyFunc + 124 6 IOKit 0x307dc884 IODispatchCalloutFromCFMessage + 292 7 CoreFoundation 0x37537e30 __CFMachPortPerform + 212 8 CoreFoundation 0x3752f5c4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 22 9 CoreFoundation 0x3752f582 __CFRunLoopDoSource1 + 158 10 CoreFoundation 0x3752182e __CFRunLoopRun + 574 11 CoreFoundation 0x37521504 CFRunLoopRunSpecific + 220 12 CoreFoundation 0x37521412 CFRunLoopRunInMode + 54 13 GraphicsServices 0x33e76d1c GSEventRunModal + 188 14 UIKit 0x3591d574 -[UIApplication _run] + 580 15 UIKit 0x3591a550 UIApplicationMain + 964 16 MyApp 0x000177ae 0x1000 + 92078 17 MyApp 0x00002f68 0x1000 + 8040 Thread 1: 0 libSystem.B.dylib 0x35d8f974 kevent + 24 1 libSystem.B.dylib 0x35e5e2fc _dispatch_mgr_invoke + 88 2 libSystem.B.dylib 0x35e5dd68 _dispatch_queue_invoke + 96 3 libSystem.B.dylib 0x35e5d788 _dispatch_worker_thread2 + 120 4 libSystem.B.dylib 0x35de6970 _pthread_wqthread + 392 5 libSystem.B.dylib 0x35ddd2fc start_wqthread + 0 Thread 2: 0 libSystem.B.dylib 0x35d5b3b0 mach_msg_trap + 20 1 libSystem.B.dylib 0x35d5d894 mach_msg + 60 2 CoreFoundation 0x37521f7c __CFRunLoopServiceMachPort + 88 3 CoreFoundation 0x37521780 __CFRunLoopRun + 400 4 CoreFoundation 0x37521504 CFRunLoopRunSpecific + 220 5 CoreFoundation 0x37521412 CFRunLoopRunInMode + 54 6 WebCore 0x3318bd14 RunWebThread(void*) + 524 7 libSystem.B.dylib 0x35de5b44 _pthread_start + 364 8 libSystem.B.dylib 0x35dd77a4 thread_start + 0 Thread 3: 0 libSystem.B.dylib 0x35d5b3b0 mach_msg_trap + 20 1 libSystem.B.dylib 0x35d5d894 mach_msg + 60 2 CoreFoundation 0x37521f7c __CFRunLoopServiceMachPort + 88 3 CoreFoundation 0x37521780 __CFRunLoopRun + 400 4 CoreFoundation 0x37521504 CFRunLoopRunSpecific + 220 5 CoreFoundation 0x37521412 CFRunLoopRunInMode + 54 6 Foundation 0x3517ec4e +[NSURLConnection(NSURLConnectionReallyInternal) _resourceLoadLoop:] + 210 7 Foundation 0x3515cb8a -[NSThread main] + 42 8 Foundation 0x35155b90 __NSThread__main__ + 908 9 libSystem.B.dylib 0x35de5b44 _pthread_start + 364 10 libSystem.B.dylib 0x35dd77a4 thread_start + 0 Thread 4: 0 libSystem.B.dylib 0x35d848d8 select$DARWIN_EXTSN + 20 1 CoreFoundation 0x3755aa34 __CFSocketManager + 356 2 libSystem.B.dylib 0x35de5b44 _pthread_start + 364 3 libSystem.B.dylib 0x35dd77a4 thread_start + 0 Thread 5: 0 libSystem.B.dylib 0x35de72fc __workq_kernreturn + 8 1 libSystem.B.dylib 0x35de6b50 _pthread_wqthread + 872 2 libSystem.B.dylib 0x35ddd2fc start_wqthread + 0 Thread 6: 0 libSystem.B.dylib 0x35d5b3b0 mach_msg_trap + 20 1 libSystem.B.dylib 0x35d5d894 mach_msg + 60 2 CoreFoundation 0x37521f7c __CFRunLoopServiceMachPort + 88 3 CoreFoundation 0x37521780 __CFRunLoopRun + 400 4 CoreFoundation 0x37521504 CFRunLoopRunSpecific + 220 5 CoreFoundation 0x37521412 CFRunLoopRunInMode + 54 6 MapKit 0x3627ec44 TileCachePrivate::runCacheThread() + 412 7 MapKit 0x3627ea98 _runCacheThread(void*) + 4 8 libSystem.B.dylib 0x35de5b44 _pthread_start + 364 9 libSystem.B.dylib 0x35dd77a4 thread_start + 0 Thread 7: 0 libSystem.B.dylib 0x35de454c __semwait_signal + 24 1 libSystem.B.dylib 0x35d90f70 _pthread_cond_wait + 1140 2 libSystem.B.dylib 0x35d90910 pthread_cond_wait + 48 3 QuartzCore 0x33dd01fc CA::DispatchGroup::thread(void*) + 128 4 QuartzCore 0x33d86e30 thread_fun + 20 5 libSystem.B.dylib 0x35de5b44 _pthread_start + 364 6 libSystem.B.dylib 0x35dd77a4 thread_start + 0 Thread 8 Crashed: 0 CoreFoundation 0x374ffa7c ___CFBasicHashFindBucket_Linear + 120 1 CoreFoundation 0x374ff948 CFBasicHashAddValue + 352 2 CoreFoundation 0x3750410a CFSetAddValue + 90 3 CoreFoundation 0x3752be2a -[__NSCFSet addObject:] + 34 4 CoreData 0x34994b72 -[NSManagedObjectContext refreshObject:mergeChanges:] + 166 5 CoreData 0x349b3288 -[NSManagedObjectContext mergeChangesFromContextDidSaveNotification:] + 1800 6 MyApp 0x0001aa18 0x1000 + 104984 7 Foundation 0x351663ae _nsnote_callback + 150 8 CoreFoundation 0x3752096a __CFXNotificationPost_old + 390 9 CoreFoundation 0x3752060a _CFXNotificationPostNotification + 122 10 Foundation 0x3515569c -[NSNotificationCenter postNotificationName:object:userInfo:] + 64 11 CoreData 0x349a0a68 -[NSManagedObjectContext(_NSInternalAdditions) _didSaveChanges] + 1772 12 CoreData 0x3499b87a -[NSManagedObjectContext save:] + 462 13 MyApp 0x00018e26 0x1000 + 97830 14 MyApp 0x0001a372 0x1000 + 103282 15 MyApp 0x00005344 0x1000 + 17220 16 Foundation 0x3515cb8a -[NSThread main] + 42 17 Foundation 0x35155b90 __NSThread__main__ + 908 18 libSystem.B.dylib 0x35de5b44 _pthread_start + 364 19 libSystem.B.dylib 0x35dd77a4 thread_start + 0 Thread 8 crashed with ARM Thread State: r0: 0x00000001 r1: 0x0018be57 r2: 0x0020fdc8 r3: 0x00000001 r4: 0x00000002 r5: 0x001cde10 r6: 0x00000007 r7: 0x2ff780b8 r8: 0x00000001 r9: 0x2ff780e0 r10: 0x001ce3e0 r11: 0x00000000 ip: 0x3752be09 sp: 0x2ff78074 lr: 0x374ffa50 pc: 0x374ffa7c cpsr: 0x20000010 Binary Images: 0x1000 - 0x40fff +MyApp armv6 <1515b6768d3049d6eef946a5e74e95ed> /var/mobile/Applications/43E12C67-7D7D-4F30-A7E3-D83DDE0FDCC1/GPS-Explorer.app/GPS-Explorer 0xe3000 - 0xe4fff dns.so armv6 <88b569311cca4a9593b2d670051860d1> /usr/lib/info/dns.so 0x2fe00000 - 0x2fe29fff dyld armv6 <617f6daf4103547c47a8407a2e0b90de> /usr/lib/dyld 0x30270000 - 0x3027bfff ITSync armv6 <a451205e89373cbdf0832688085e8f72> /System/Library/PrivateFrameworks/ITSync.framework/ITSync 0x3027c000 - 0x3027efff IOMobileFramebuffer armv6 <f42bbbf67195a7b98d67ad021bba4784> /System/Library/PrivateFrameworks/IOMobileFramebuffer.framework/IOMobileFramebuffer 0x3027f000 - 0x3038dfff CFNetwork armv6 <d6eeee83216ee9c553134f069f37cbc2> /System/Library/Frameworks/CFNetwork.framework/CFNetwork 0x303ef000 - 0x303f4fff CaptiveNetwork armv6 <f41df4b358b77b29ff85e0eaea88ee1d> /System/Library/PrivateFrameworks/CaptiveNetwork.framework/CaptiveNetwork 0x303f5000 - 0x30444fff Security armv6 <cf625b4dc7ea928891313444ef64a7cb> /System/Library/Frameworks/Security.framework/Security 0x30445000 - 0x3055cfff libicucore.A.dylib armv6 <8968ff3f62d7780bb1bd75026a7628d0> /usr/lib/libicucore.A.dylib 0x3055d000 - 0x30561fff ApplePushService armv6 <0560b630d26e261e205fc58942e1885c> /System/Library/PrivateFrameworks/ApplePushService.framework/ApplePushService 0x3059d000 - 0x305a8fff MobileWiFi armv6 <c7532e63e083a1dd2a0ef7352b85749d> /System/Library/PrivateFrameworks/MobileWiFi.framework/MobileWiFi 0x305aa000 - 0x30612fff libvDSP.dylib armv6 <9d264733fc675943c082bd3b9b567b59> /System/Library/Frameworks/Accelerate.framework/Frameworks/vecLib.framework/libvDSP.dylib 0x30613000 - 0x3064dfff MobileCoreServices armv6 <beb473ce80390554bb4af21554522286> /System/Library/Frameworks/MobileCoreServices.framework/MobileCoreServices 0x3065c000 - 0x3066efff libbsm.0.dylib armv6 <51e7bb18da9afa44a33e54e42fbd0707> /usr/lib/libbsm.0.dylib 0x3066f000 - 0x306c6fff CoreMedia armv6 <cd5e9398c161f129146931e888e1c92e> /System/Library/Frameworks/CoreMedia.framework/CoreMedia 0x306f0000 - 0x306fefff libz.1.dylib armv6 <84592e96bae1a661374b0f9a5d03a3a0> /usr/lib/libz.1.dylib 0x306ff000 - 0x30729fff PrintKit armv6 <74f9710fa01a33b5bb04c4aeabd6be7d> /System/Library/PrivateFrameworks/PrintKit.framework/PrintKit 0x307d7000 - 0x3082afff IOKit armv6 <20da5e822f21a8d0a7c5b3e149330efd> /System/Library/Frameworks/IOKit.framework/Versions/A/IOKit 0x30831000 - 0x3083bfff AccountSettings armv6 <eca67ab04f724e1fa7c6406c88e75433> /System/Library/PrivateFrameworks/AccountSettings.framework/AccountSettings 0x30999000 - 0x309c5fff DataAccess armv6 <8c045822d57a369835f5b40653a48838> /System/Library/PrivateFrameworks/DataAccess.framework/DataAccess 0x309c6000 - 0x309f4fff MIME armv6 <fac8f55c508ff476e07894af7abdb761> /System/Library/PrivateFrameworks/MIME.framework/MIME 0x30a04000 - 0x30aa3fff ProofReader armv6 <2734920b62f174c17aeeb15f371615ef> /System/Library/PrivateFrameworks/ProofReader.framework/ProofReader 0x30ad6000 - 0x30b1afff AddressBook armv6 <1f30c3370dad27331a491ba4b190813c> /System/Library/Frameworks/AddressBook.framework/AddressBook 0x30b3d000 - 0x30b9cfff CoreAudio armv6 <ccc4bace0d6eca79a32ed84d566f72e9> /System/Library/Frameworks/CoreAudio.framework/CoreAudio 0x30ba6000 - 0x32ce3fff TextInput armv6 <3fa14e6e5749e0230becd6ea34a8da7a> /System/Library/PrivateFrameworks/TextInput.framework/TextInput 0x32d7d000 - 0x32d89fff libkxld.dylib armv6 <f74f359de7bbe3ccdc37fa6f332aebf4> /usr/lib/system/libkxld.dylib 0x32d95000 - 0x32e5cfff libobjc.A.dylib armv6 <429841269f8bcecd4ba3264a8725dad6> /usr/lib/libobjc.A.dylib 0x32e5d000 - 0x32ecdfff libsqlite3.dylib armv6 <87b9bb47687902d9120d03d1da9eb9fc> /usr/lib/libsqlite3.dylib 0x32f0c000 - 0x32f1ffff libmis.dylib armv6 <dba9c086b49bd9540930ff27211570d6> /usr/lib/libmis.dylib 0x33055000 - 0x33061fff SpringBoardServices armv6 <fd0c472436b3306f5b56118c93c8a423> /System/Library/PrivateFrameworks/SpringBoardServices.framework/SpringBoardServices 0x33062000 - 0x3306ffff MobileBluetooth armv6 <2b68516e1321011a4efbee2947d463c6> /System/Library/PrivateFrameworks/MobileBluetooth.framework/MobileBluetooth 0x33070000 - 0x338bffff WebCore armv6 <aa3b6827f051da7a3494c9bee4ebe290> /System/Library/PrivateFrameworks/WebCore.framework/WebCore 0x338c0000 - 0x338d4fff MobileDeviceLink armv6 <19d66078f8cf19be558713c13612c7a3> /System/Library/PrivateFrameworks/MobileDeviceLink.framework/MobileDeviceLink 0x338d5000 - 0x33a1dfff libmecabra.dylib armv6 <fc962eeb4e6cfe4ad5ebee6fb4b1d5c1> /usr/lib/libmecabra.dylib 0x33a21000 - 0x33a6afff CoreLocation armv6 <a69399375024b2bfae8bb96e845f4fd0> /System/Library/Frameworks/CoreLocation.framework/CoreLocation 0x33a6b000 - 0x33ab3fff iCalendar armv6 <fbb717874ea0ede24454a5def644ab69> /System/Library/PrivateFrameworks/iCalendar.framework/iCalendar 0x33ab4000 - 0x33ab4fff Accelerate armv6 <cdde24a7ad004b2b2e600cd4f3ac5eb7> /System/Library/Frameworks/Accelerate.framework/Accelerate 0x33b32000 - 0x33b72fff QuickLook armv6 <54400e0d48ec86c84e937e55790b9e54> /System/Library/Frameworks/QuickLook.framework/QuickLook 0x33bbc000 - 0x33c0afff CoreText armv6 <16c9582fdffb598178287c6ce9fd6897> /System/Library/Frameworks/CoreText.framework/CoreText 0x33c16000 - 0x33d73fff libGLProgrammability.dylib armv6 <aec6b54ffd532bb607aab4acbab679b6> /System/Library/Frameworks/OpenGLES.framework/libGLProgrammability.dylib 0x33d76000 - 0x33d79fff ActorKit armv6 <d3ec50b4a7f0257ef31baf37936dc275> /System/Library/PrivateFrameworks/ActorKit.framework/ActorKit 0x33d85000 - 0x33e71fff QuartzCore armv6 <77cd91ff21fe6c58c309f2c82eb95ca5> /System/Library/Frameworks/QuartzCore.framework/QuartzCore 0x33e72000 - 0x33e81fff GraphicsServices armv6 <af20aba0ec96e7b7c42bb55ac763c784> /System/Library/PrivateFrameworks/GraphicsServices.framework/GraphicsServices 0x33ead000 - 0x33f6efff ImageIO armv6 <0c1b6f466667ff345f2399d8142a9d10> /System/Library/Frameworks/ImageIO.framework/ImageIO 0x33f78000 - 0x33f79fff CoreSurface armv6 <5e290514380c626e9b0f9f9985b9dc7a> /System/Library/PrivateFrameworks/CoreSurface.framework/CoreSurface 0x340ac000 - 0x340bffff Notes armv6 <acf9e548948ecb299270c8398ef297a1> /System/Library/PrivateFrameworks/Notes.framework/Notes 0x34137000 - 0x34156fff EAP8021X armv6 <fa56845b5396c3ebb368c2368331643c> /System/Library/PrivateFrameworks/EAP8021X.framework/EAP8021X 0x341ad000 - 0x341ebfff ContentIndex armv6 <7f3334380acc72292571803f0b490189> /System/Library/PrivateFrameworks/ContentIndex.framework/ContentIndex 0x343a0000 - 0x343bffff Bom armv6 <f41bef81e23e2bff59155e5ce46762d3> /System/Library/PrivateFrameworks/Bom.framework/Bom 0x343c0000 - 0x344bdfff JavaScriptCore armv6 <3547c92c1efc0522b087e7f10eba7728> /System/Library/PrivateFrameworks/JavaScriptCore.framework/JavaScriptCore 0x344be000 - 0x34500fff ManagedConfiguration armv6 <397723a33c19c3487d304d69580acbfc> /System/Library/PrivateFrameworks/ManagedConfiguration.framework/ManagedConfiguration 0x34954000 - 0x34a5cfff CoreData armv6 <6e3af4b4648ae695f8d4bc0bf5a9dba5> /System/Library/Frameworks/CoreData.framework/CoreData 0x34a6e000 - 0x34a72fff CertUI armv6 <57c499baf9d343a78fe1b43f0f3ef997> /System/Library/PrivateFrameworks/CertUI.framework/CertUI 0x34b52000 - 0x34f1ffff libLAPACK.dylib armv6 <0eb734c91165416224b98c943ff6476b> /System/Library/Frameworks/Accelerate.framework/Frameworks/vecLib.framework/libLAPACK.dylib 0x34f20000 - 0x35014fff libiconv.2.dylib armv6 <01916d6784f4de8f3746978faae9c5fa> /usr/lib/libiconv.2.dylib 0x35015000 - 0x35022fff CoreVideo armv6 <7b100fd5fdf98db1cd0f0649e7f6f316> /System/Library/Frameworks/CoreVideo.framework/CoreVideo 0x35023000 - 0x3507dfff MessageUI armv6 <21bb9d93911f7015b79aef9dc6df55ef> /System/Library/Frameworks/MessageUI.framework/MessageUI 0x35087000 - 0x35148fff AddressBookUI armv6 <fea72732451610277e22a667d35ad76d> /System/Library/Frameworks/AddressBookUI.framework/AddressBookUI 0x35151000 - 0x35272fff Foundation armv6 <6bdeb19a1fcb93e2930dadb50416f881> /System/Library/Frameworks/Foundation.framework/Foundation 0x3529b000 - 0x352a6fff libbz2.1.0.dylib armv6 <6aa8a4ed0906a495d059ace9125f525d> /usr/lib/libbz2.1.0.dylib 0x352dc000 - 0x35342fff libBLAS.dylib armv6 <11a3677a08175a30df1b3d66d7e0951a> /System/Library/Frameworks/Accelerate.framework/Frameworks/vecLib.framework/libBLAS.dylib 0x35348000 - 0x353b0fff GMM armv6 <adcdfedd491ac237b385b6c2d7f684e3> /System/Library/PrivateFrameworks/GMM.framework/GMM 0x35406000 - 0x35406fff vecLib armv6 <8f914b3e8a581d49fb21d2c0ff75be03> /System/Library/Frameworks/Accelerate.framework/Frameworks/vecLib.framework/vecLib 0x35407000 - 0x3540afff MobileInstallation armv6 <456ed7fe6dd9fcd8e78df425085b1452> /System/Library/PrivateFrameworks/MobileInstallation.framework/MobileInstallation 0x35541000 - 0x35547fff MBX2D armv6 <fad4955cab36e0179df6f8f27d365b8f> /System/Library/PrivateFrameworks/MBX2D.framework/MBX2D 0x35758000 - 0x35778fff AppleAccount armv6 <0ef3f6564414f3ef030031ae25b28bbd> /System/Library/PrivateFrameworks/AppleAccount.framework/AppleAccount 0x35779000 - 0x3577bfff TextInput_de armv6 <e51cb663d64b8ced7dccfdbd3ad04591> /System/Library/TextInput/TextInput_de.bundle/TextInput_de 0x35815000 - 0x3581afff AssetsLibraryServices armv6 <224b3cf992a01814f91481244e3213eb> /System/Library/PrivateFrameworks/AssetsLibraryServices.framework/AssetsLibraryServices 0x3581b000 - 0x35877fff libGLImage.dylib armv6 <7c1049f20c4e64591c09d3ac00c7d3ab> /System/Library/Frameworks/OpenGLES.framework/libGLImage.dylib 0x358bc000 - 0x358c3fff liblockdown.dylib armv6 <f470dea180ddf23886df75eb256d3888> /usr/lib/liblockdown.dylib 0x358cc000 - 0x358cffff libgcc_s.1.dylib armv6 <bed95ed187350ce27d22ed241ef892ea> /usr/lib/libgcc_s.1.dylib 0x358d3000 - 0x35d4ffff UIKit armv6 <14ec6c926b8bda71b73136f6e1a6ac1b> /System/Library/Frameworks/UIKit.framework/UIKit 0x35d5a000 - 0x35e98fff libSystem.B.dylib armv6 <70571c1e697e2ae7f7a9b1a499453bb6> /usr/lib/libSystem.B.dylib 0x35f7e000 - 0x35fc2fff VideoToolbox armv6 <101dbbcd34cc3231a8be3fd6392556aa> /System/Library/PrivateFrameworks/VideoToolbox.framework/VideoToolbox 0x35fdb000 - 0x36162fff CoreGraphics armv6 <9a1d72fa9549d83abc1e735ba37a4dc2> /System/Library/Frameworks/CoreGraphics.framework/CoreGraphics 0x36167000 - 0x36178fff DataAccessExpress armv6 <c112bd2791eb706526db25407ec117d4> /System/Library/PrivateFrameworks/DataAccessExpress.framework/DataAccessExpress 0x36179000 - 0x36255fff WebKit armv6 <83da207070be989ba81dba3a83d5206a> /System/Library/PrivateFrameworks/WebKit.framework/WebKit 0x36269000 - 0x36278fff OpenGLES armv6 <37eda5ddcff210dd321157da35a87a5e> /System/Library/Frameworks/OpenGLES.framework/OpenGLES 0x36279000 - 0x36362fff MapKit armv6 <d28b96a0107a7822fda677ed28901c0c> /System/Library/Frameworks/MapKit.framework/MapKit 0x363f3000 - 0x363f9fff MobileKeyBag armv6 <2d83bf6a43bab972d77a1a6e0f3b03d2> /System/Library/PrivateFrameworks/MobileKeyBag.framework/MobileKeyBag 0x363fa000 - 0x36483fff Message armv6 <9ed4944d998f99e69ba81afdda659bee> /System/Library/PrivateFrameworks/Message.framework/Message 0x36500000 - 0x36508fff ProtocolBuffer armv6 <8ed6e560e85eecfaf625219a8247aea4> /System/Library/PrivateFrameworks/ProtocolBuffer.framework/ProtocolBuffer 0x365db000 - 0x365f9fff libresolv.9.dylib armv6 <9c94634beea733e754dc115737b6e63c> 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0x36a30fff CrashReporterSupport armv6 <00bc60f690e6328b64e7a7b718edf45a> /System/Library/PrivateFrameworks/CrashReporterSupport.framework/CrashReporterSupport 0x36a31000 - 0x36a74fff CoreTelephony armv6 <cabbce0fa7630065dc7e7d3ca3bc616c> /System/Library/Frameworks/CoreTelephony.framework/CoreTelephony 0x36c1c000 - 0x36c26fff AggregateDictionary armv6 <f7429444c955e4f13c6761d20032ab52> /System/Library/PrivateFrameworks/AggregateDictionary.framework/AggregateDictionary 0x36c2b000 - 0x36de1fff AudioToolbox armv6 <bb65e8ed531fe5923eb8ac00a7c0d87d> /System/Library/Frameworks/AudioToolbox.framework/AudioToolbox 0x36de2000 - 0x36e16fff AppSupport armv6 <783e14db9585fd063c0c2a755cd121b6> /System/Library/PrivateFrameworks/AppSupport.framework/AppSupport 0x36e17000 - 0x36e2dfff PersistentConnection armv6 <006723906b8ac250c1681a1821fbe94d> /System/Library/PrivateFrameworks/PersistentConnection.framework/PersistentConnection 0x36e2e000 - 0x37140fff GeoServices armv6 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2 answers

In some really rare cases, the application crashes with EXC_BAD_ACCESS on the line mergeChangesFromContextDidSaveNotification: saying that saveNotification has an Invalid Summary. (even if you try the block does not work)

EXC_BAD_ACCESS is a complex failure, not an exception, so try-catch will not catch it.

Can you post a crash backtrace and an invalid summary message?

All in all, this sounds like a thread synchronization issue. It looks like you have a relatively complex concurrency model and most likely there is a synchronization error there.

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If you are using multiple ManagedObjectContext for threads, you need to lock the context before any read / write operation to ManagedObjects from that context.

This is especially important when implementing mergeContextFromDidSaveNotification, because in this case the context is used simultaneously by two threads. Then you need to lock the context before merging in the notified stream (usually in the main stream) and before any change in the background stream.

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Source: https://habr.com/ru/post/1344414/

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