我有一个OS X应用程序，它使用Core Data＆amp;绑定和最近更新到新版本。较新版本包含更新的数据模型（由一个与之前的实体没有任何关系的附加实体组成）。数据模型的更新在两个版本中，我使用自动轻量级迁移功能。两个版本都在应用程序内部发布。我们有数千名用户已经更新。由于此问题，我们未收到任何支持请求或自动崩溃报告。这就是为什么我认为我的代码是（好的）OK-ish。
但仍有一个堆栈痕迹让我发疯：
OS Version: 10.9.2 (Build 13C1021)
Architecture: x86_64
Report Version: 18
Command: Rainbow Unicorn
Path: /Applications/Rainbow Unicorn.app/Contents/MacOS/Rainbow Unicorn
Version: 1.8 (35)
App Item ID: 414704443
App External ID: 510002694
Parent: launchd [155]
PID: 1390
Event: hang
Duration: 4.84s (process was unresponsive for 117 seconds before sampling)
Steps: 40 (100ms sampling interval)
Hardware model: MacBookPro8,1
Active cpus: 4
Fan speed: 1996 rpm
Free pages: 31445 pages (-25644)
Pageins: 144 pages
Pageouts: 0 pages
Swapins: 0 pages
Swapouts: 0 pages
Process: Rainbow Unicorn [1390]
Path: /Applications/Rainbow Unicorn.app/Contents/MacOS/Rainbow Unicorn
Architecture: x86_64
Parent: launchd [155]
UID: 501
Task size: 77873 pages (+13047)
CPU Time: 0.227s
Note: Unresponsive for 117 seconds before sampling
Thread 0xd10a6 DispatchQueue 1 priority 46 cpu time 0.227s
40 start + 1 (libdyld.dylib) [0x7fff835ed5fd]
40 NSApplicationMain + 448 (AppKit) [0x7fff8b328727]
40 +[NSBundle(NSNibLoading) loadNibNamed:owner:] + 357 (AppKit) [0x7fff8b32c8db]
40 -[NSBundle(NSNibLoading) loadNibNamed:owner:topLevelObjects:] + 197 (AppKit) [0x7fff8b32caec]
40 +[NSBundle(NSNibLoading) _loadNibFile:nameTable:withZone:ownerBundle:] + 288 (AppKit) [0x7fff8b32ccfc]
40 loadNib + 327 (AppKit) [0x7fff8b32d75e]
40 -[NSIBObjectData nibInstantiateWithOwner:topLevelObjects:] + 1004 (AppKit) [0x7fff8b338bf4]
40 -[NSObject(NSKeyValueBindingCreation) bind:toObject:withKeyPath:options:] + 652 (AppKit) [0x7fff8b3d30a8]
40 -[NSObjectParameterBinder _updateObject:observedController:observedKeyPath:context:] + 1118 (AppKit) [0x7fff8b3dbff9]
40 -[NSBinder valueForBinding:resolveMarkersToPlaceholders:] + 160 (AppKit) [0x7fff8b3dc3bd]
40 -[NSObject(NSKeyValueCoding) valueForKeyPath:] + 334 (Foundation) [0x7fff890714ff]
40 -[NSObject(NSKeyValueCoding) valueForKey:] + 381 (Foundation) [0x7fff89059466]
40 ??? (Rainbow Unicorn + 13382) [0x10871c446]
40 ??? (Rainbow Unicorn + 12213) [0x10871bfb5]
40 ??? (Rainbow Unicorn + 12919) [0x10871c277]
40 -[NSPersistentStoreCoordinator addPersistentStoreWithType:configuration:URL:options:error:] + 4014 (CoreData) [0x7fff888bb4de]
40 -[NSStoreMigrationPolicy(InternalMethods) _gatherDataAndPerformMigration:] + 2039 (CoreData) [0x7fff889c60a7]
40 -[NSStoreMigrationPolicy migrateStoreAtURL:withManager:metadata:options:error:] + 102 (CoreData) [0x7fff889c4626]
40 -[NSStoreMigrationPolicy(InternalMethods) migrateStoreAtURL:toURL:storeType:options:withManager:error:] + 290 (CoreData) [0x7fff889c5792]
40 -[NSMigrationManager migrateStoreFromURL:type:options:withMappingModel:toDestinationURL:destinationType:destinationOptions:error:] + 521 (CoreData) [0x7fff889c7889]
40 -[NSSQLiteInPlaceMigrationManager migrateStoreFromURL:type:options:withMappingModel:toDestinationURL:destinationType:destinationOptions:error:] + 1737 (CoreData) [0x7fff889ddac9]
40 -[_NSSQLiteStoreMigrator performMigration:] + 782 (CoreData) [0x7fff889e142e]
40 -[NSSQLConnection prepareAndExecuteSQLStatement:] + 52 (CoreData) [0x7fff88901e44]
40 -[NSSQLiteConnection execute] + 2040 (CoreData) [0x7fff888c75d8]
40 _execute + 214 (CoreData) [0x7fff888c7926]
40 sqlite3_step + 666 (libsqlite3.dylib) [0x7fff893be40a]
32 sqlite3VdbeExec + 68340 (libsqlite3.dylib) [0x7fff893cff44]
32 sqlite3VdbeMemFromBtree + 438 (libsqlite3.dylib) [0x7fff893db306]
29 accessPayload + 752 (libsqlite3.dylib) [0x7fff893fa6c0]
29 sqlite3PagerAcquire + 349 (libsqlite3.dylib) [0x7fff893a518d]
29 readDbPage + 478 (libsqlite3.dylib) [0x7fff893a65ee]
29 pread + 10 (libsystem_kernel.dylib) [0x7fff835a4962]
*29 hndl_unix_scall64 + 22 (mach_kernel) [0xffffff80002f3b76]
*29 unix_syscall64 + 499 (mach_kernel) [0xffffff800063e413]
*29 pread_nocancel + 137 (mach_kernel) [0xffffff80005efc49]
*29 ??? (mach_kernel + 4127438) [0xffffff80005eface]
*29 ??? (mach_kernel + 2045365) [0xffffff80003f35b5]
*29 VNOP_READ + 225 (mach_kernel) [0xffffff80003fda01]
*29 hfs_vnop_read + 566 (mach_kernel) [0xffffff800056b1f6]
*29 cluster_read_ext + 5045 (mach_kernel) [0xffffff80003d0765]
*28 ??? (mach_kernel + 1904306) [0xffffff80003d0eb2]
*28 ??? (mach_kernel + 1910723) [0xffffff80003d27c3]
*28 memory_object_control_uiomove + 284 (mach_kernel) [0xffffff800026cdcc]
*28 lck_rw_sleep + 81 (mach_kernel) [0xffffff800022d921]
*28 thread_block_reason + 204 (mach_kernel) [0xffffff8000235d8c]
*28 ??? (mach_kernel + 223627) [0xffffff800023698b]
*28 machine_switch_context + 354 (mach_kernel) [0xffffff80002d7e92]
*1 ??? (mach_kernel + 1904418) [0xffffff80003d0f22]
*1 ??? (mach_kernel + 1914137) [0xffffff80003d3519]
*1 lck_rw_lock_exclusive + 17 (mach_kernel) [0xffffff80002d0c81]
3 accessPayload + 918 (libsqlite3.dylib) [0x7fff893fa766]
3 _platform_memmove$VARIANT$Nehalem + 178 (libsystem_platform.dylib) [0x7fff8b19c092]
*3 hndl_alltraps + 219 (mach_kernel) [0xffffff80002f327b]
*3 user_trap + 748 (mach_kernel) [0xffffff80002dc2bc]
*2 vm_fault + 5246 (mach_kernel) [0xffffff80002791be]
*2 delay + 51 (mach_kernel) [0xffffff80002221d3]
*2 thread_block_reason + 204 (mach_kernel) [0xffffff8000235d8c]
*2 ??? (mach_kernel + 223627) [0xffffff800023698b]
*2 machine_switch_context + 354 (mach_kernel) [0xffffff80002d7e92]
*1 vm_fault + 4767 (mach_kernel) [0xffffff8000278fdf]
*1 vm_fault_enter + 2631 (mach_kernel) [0xffffff8000277587]
*1 pmap_enter_options + 5013 (mach_kernel) [0xffffff80002c4ef5]
7 sqlite3VdbeExec + 30051 (libsqlite3.dylib) [0x7fff893c69b3]
7 sqlite3BtreeInsert + 1205 (libsqlite3.dylib) [0x7fff893e6655]
6 allocateBtreePage + 1626 (libsqlite3.dylib) [0x7fff893ecbba]
5 sqlite3PagerAcquire + 349 (libsqlite3.dylib) [0x7fff893a518d]
5 readDbPage + 478 (libsqlite3.dylib) [0x7fff893a65ee]
5 pread + 10 (libsystem_kernel.dylib) [0x7fff835a4962]
*5 hndl_unix_scall64 + 22 (mach_kernel) [0xffffff80002f3b76]
*5 unix_syscall64 + 499 (mach_kernel) [0xffffff800063e413]
*5 pread_nocancel + 137 (mach_kernel) [0xffffff80005efc49]
*5 ??? (mach_kernel + 4127438) [0xffffff80005eface]
*5 ??? (mach_kernel + 2045365) [0xffffff80003f35b5]
*5 VNOP_READ + 225 (mach_kernel) [0xffffff80003fda01]
*5 hfs_vnop_read + 566 (mach_kernel) [0xffffff800056b1f6]
*5 cluster_read_ext + 5045 (mach_kernel) [0xffffff80003d0765]
*5 ??? (mach_kernel + 1905981) [0xffffff80003d153d]
*5 msleep + 114 (mach_kernel) [0xffffff80005e1852]
*5 ??? (mach_kernel + 4068901) [0xffffff80005e1625]
*5 lck_mtx_sleep + 78 (mach_kernel) [0xffffff800022d1be]
*5 thread_block_reason + 204 (mach_kernel) [0xffffff8000235d8c]
*5 ??? (mach_kernel + 223627) [0xffffff800023698b]
*5 machine_switch_context + 354 (mach_kernel) [0xffffff80002d7e92]
1 sqlite3PagerAcquire + 68 (libsqlite3.dylib) [0x7fff893a5074]
1 sqlite3PcacheFetch + 299 (libsqlite3.dylib) [0x7fff893a53fb]
1 pagerStress + 326 (libsqlite3.dylib) [0x7fff8943b736]
1 syncJournal + 436 (libsqlite3.dylib) [0x7fff893efec4]
1 fsync + 10 (libsystem_kernel.dylib) [0x7fff835a4392]
*1 hndl_unix_scall64 + 22 (mach_kernel) [0xffffff80002f3b76]
*1 unix_syscall64 + 499 (mach_kernel) [0xffffff800063e413]
*1 ??? (mach_kernel + 2010599) [0xffffff80003eade7]
*1 VNOP_FSYNC + 67 (mach_kernel) [0xffffff80003fe063]
*1 hfs_vnop_fsync + 107 (mach_kernel) [0xffffff8000589fbb]
*1 hfs_fsync + 295 (mach_kernel) [0xffffff8000586677]
*1 cluster_push_ext + 521 (mach_kernel) [0xffffff80003d1e39]
*1 vnode_waitforwrites + 227 (mach_kernel) [0xffffff80003d8693]
*1 msleep + 114 (mach_kernel) [0xffffff80005e1852]
*1 ??? (mach_kernel + 4068901) [0xffffff80005e1625]
*1 lck_mtx_sleep + 78 (mach_kernel) [0xffffff800022d1be]
*1 thread_block_reason + 204 (mach_kernel) [0xffffff8000235d8c]
*1 ??? (mach_kernel + 223627) [0xffffff800023698b]
*1 machine_switch_context + 354 (mach_kernel) [0xffffff80002d7e92]
1 allocateBtreePage + 1691 (libsqlite3.dylib) [0x7fff893ecbfb]
1 sqlite3PagerWrite + 90 (libsqlite3.dylib) [0x7fff893e330a]
1 pager_write + 1450 (libsqlite3.dylib) [0x7fff893e3e7a]
1 pwrite + 10 (libsystem_kernel.dylib) [0x7fff835a49aa]
*1 hndl_unix_scall64 + 22 (mach_kernel) [0xffffff80002f3b76]
*1 unix_syscall64 + 499 (mach_kernel) [0xffffff800063e413]
*1 pwrite_nocancel + 362 (mach_kernel) [0xffffff80005f030a]
*1 ??? (mach_kernel + 4128961) [0xffffff80005f00c1]
*1 ??? (mach_kernel + 2046147) [0xffffff80003f38c3]
*1 VNOP_WRITE + 225 (mach_kernel) [0xffffff80003fdb31]
*1 hfs_vnop_write + 2472 (mach_kernel) [0xffffff800056bce8]
*1 cluster_write + 37 (mach_kernel) [0xffffff80003cd0a5]
*1 cluster_write_ext + 3864 (mach_kernel) [0xffffff80003cdfc8]
*1 ??? (mach_kernel + 1896259) [0xffffff80003cef43]
*1 ubc_upl_commit_range + 136 (mach_kernel) [0xffffff8000600138]
*1 upl_commit_range + 3006 (mach_kernel) [0xffffff800029dd6e]
1 sqlite3VdbeExec + 4284 (libsqlite3.dylib) [0x7fff893c050c]
1 sqlite3BtreeMovetoUnpacked + 1143 (libsqlite3.dylib) [0x7fff893da8f7]
1 sqlite3PagerAcquire + 349 (libsqlite3.dylib) [0x7fff893a518d]
1 readDbPage + 478 (libsqlite3.dylib) [0x7fff893a65ee]
1 pread + 10 (libsystem_kernel.dylib) [0x7fff835a4962]
*1 hndl_unix_scall64 + 22 (mach_kernel) [0xffffff80002f3b76]
*1 unix_syscall64 + 499 (mach_kernel) [0xffffff800063e413]
*1 pread_nocancel + 137 (mach_kernel) [0xffffff80005efc49]
*1 ??? (mach_kernel + 4127438) [0xffffff80005eface]
*1 ??? (mach_kernel + 2045365) [0xffffff80003f35b5]
*1 VNOP_READ + 225 (mach_kernel) [0xffffff80003fda01]
*1 hfs_vnop_read + 566 (mach_kernel) [0xffffff800056b1f6]
*1 cluster_read_ext + 5045 (mach_kernel) [0xffffff80003d0765]
*1 ??? (mach_kernel + 1905981) [0xffffff80003d153d]
*1 msleep + 114 (mach_kernel) [0xffffff80005e1852]
*1 ??? (mach_kernel + 4068901) [0xffffff80005e1625]
*1 lck_mtx_sleep + 78 (mach_kernel) [0xffffff800022d1be]
*1 thread_block_reason + 204 (mach_kernel) [0xffffff8000235d8c]
*1 ??? (mach_kernel + 223627) [0xffffff800023698b]
*1 machine_switch_context + 354 (mach_kernel) [0xffffff80002d7e92]
它只发生在一个客户身上，并且可以在她的Mac上重现。你知道问题的根源是什么吗？我该如何解决这个错误？到目前为止我唯一知道的事情是在自动轻量级迁移期间发生崩溃并且需要花费很多时间。