我有一个Xamarin iOS应用程序，我现在正在使用一段时间。我使用的是Visual Studio for Mac，直到今天，这些东西都非常好用。我的意思是，不完美，但至少我可以使用它。
然后，它发生了。我为iPad设备aaaand构建了我的应用程序..它在启动屏幕后立即崩溃，没有任何错误。我删除了我的应用程序并再次构建它 - VSfM表现得像应用程序终止，但应用程序正常工作。我关闭了应用程序，从主屏幕启动它 - 它在启动屏幕后崩溃了。想象一下这三个步骤的每个组合都可能，包括清理和重建不同的项目版本+重新安装VSfM并重新启动iPad - 仍然是相同的结果。
然而，该应用程序在模拟器中表现完全正常。它也不会在我的其他iPad上崩溃，但调试器并没有像过程那样附加到该过程。
以下是我从设备的控制台日志中获得的内容：（ARMUIIpad和com.myapp.name适用于我的应用）
Jan 17 17:20:31 iPad-Device ReportCrash[439] <Notice>: Formulating report for corpse[437] ArmUIIpad
Jan 17 17:20:31 iPad-Device CommCenter[82] <Notice>: #I BundleID: <private> is no longer a foreground app
Jan 17 17:20:31 iPad-Device CommCenter[82] <Notice>: #I BundleID: <private> is no longer a foreground app
Jan 17 17:20:31 iPad-Device CommCenter[82] <Notice>: #I BundleID: <private> is no longer a foreground app
Jan 17 17:20:31 iPad-Device CommCenter[82] <Notice>: #I BundleID: <private> is no longer a foreground app
Jan 17 17:20:31 iPad-Device duetexpertd(AppPredictionInternal)[200] <Error>: No launch reason provided for launch.
Jan 17 17:20:31 iPad-Device symptomsd(SymptomEvaluator)[129] <Notice>: Entry, display name com.myapp.name uuid (null) pid 437 isFront 0
Jan 17 17:20:31 iPad-Device symptomsd(SymptomEvaluator)[129] <Notice>: Continue with bundle name com.myapp.name, is front 0
Jan 17 17:20:31 iPad-Device symptomsd(SymptomEvaluator)[129] <Notice>: com.myapp.name: Foreground: false
Jan 17 17:20:31 iPad-Device symptomsd(SymptomEvaluator)[129] <Notice>: Entry, display name com.apple.CoreAuthUI uuid 3471220A-220B-377E-A0D5-43222A865A37 pid 242 isFront 0
Jan 17 17:20:31 iPad-Device symptomsd(SymptomEvaluator)[129] <Notice>: Entry, display name com.apple.CoreAuthUI uuid 3471220A-220B-377E-A0D5-43222A865A37 pid 242 isFront 0
Jan 17 17:20:31 iPad-Device ReportCrash(MobileCoreServices)[439] <Notice>: notify_register_check() failed with error 1000000
Jan 17 17:20:31 iPad-Device symptomsd(SymptomEvaluator)[129] <Notice>: NBSM Current state: normal, changed: systemForeground to 0 for net type 0
Jan 17 17:20:31 iPad-Device symptomsd(SymptomEvaluator)[129] <Notice>: NBSM Eligible to go to broken
Jan 17 17:20:31 iPad-Device symptomsd(SymptomEvaluator)[129] <Notice>: NBSM Current state: normal, changed: systemForeground to 0 for net type 0, eligible for broken but constraints unsatisfied (0,0)
Jan 17 17:20:31 iPad-Device ReportCrash(CrashReporterSupport)[439] <Notice>: Report of type '109(<private>)' not saved because the limit of 25 logs has been reached
Jan 17 17:20:31 iPad-Device ReportCrash(CrashReporterSupport)[439] <Notice>: Notice: This report is abbreviated for syslog inclusion because it could not be saved to disk.
Symbolication may be possible by manually cleaning up and including the Binary Image section of a full report from this same device -- good luck!
Jan 17 17:20:31 iPad-Device ReportCrash(CrashReporterSupport)[439] <Notice>: Process: ArmUIIpad [437]
Path: /private/var/containers/Bundle/Application/6D5CB9B7-D9B5-4A73-9431-C485C4124E6C/ArmUIIpad.app/ArmUIIpad
OS Version: iPhone OS 11.2.1 (15C153)
Jan 17 17:20:31 iPad-Device ReportCrash(CrashReporterSupport)[439] <Notice>: Exception Type: EXC_BAD_ACCESS (SIGABRT)
Exception Subtype: KERN_INVALID_ADDRESS at 0x0000000000000000
VM Region Info: 0 is not in any region. Bytes before following region: 4378001408
REGION TYPE START - END [ VSIZE] PRT/MAX SHRMOD REGION DETAIL
UNUSED SPACE AT START
--->
__TEXT 0000000104f30000-0000000107e80000 [ 47.3M] r-x/r-x SM=COW ...app/ArmUIIpad
Triggered by Thread: 0
Jan 17 17:20:31 iPad-Device ReportCrash(CrashReporterSupport)[439] <Notice>: Application Specific Information:
abort() called
Jan 17 17:20:31 iPad-Device ReportCrash(CrashReporterSupport)[439] <Notice>: Thread 0 name: tid_303 Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 libsystem_kernel.dylib 0x00000001824302e8 0x18240e000 + 140008
1 libsystem_pthread.dylib 0x00000001825452f8 0x182542000 + 13048
2 libsystem_c.dylib 0x000000018239f060 0x18233c000 + 405600
3 libsystem_c.dylib 0x000000018239efc8 0x18233c000 + 405448
4 ArmUIIpad 0x0000000107cfe614 0x104f30000 + 48031252
5 ArmUIIpad 0x0000000107c070d4 0x104f30000 + 47018196
6 ArmUIIpad 0x0000000107bbf1e8 0x104f30000 + 46723560
7 ArmUIIpad 0x0000000107bbdff8 0x104f30000 + 46718968
8 ArmUIIpad 0x0000000107bb5fd8 0x104f30000 + 46686168
9 ArmUIIpad 0x0000000105044fc4 0x104f30000 + 1134532
10 ArmUIIpad 0x000000010504456c 0x104f30000 + 1131884
11 ArmUIIpad 0x00000001056033b4 0x104f30000 + 7156660
12 ArmUIIpad <\M-b\M^@\M-&>
Jan 17 17:20:31 iPad-Device ReportCrash(CrashReporterSupport)[439] <Notice>: Thread 1:
0 libsystem_kernel.dylib 0x0000000182430d80 0x18240e000 + 142720
1 libsystem_pthread.dylib 0x0000000182542eec 0x182542000 + 3820
2 libsystem_pthread.dylib 0x0000000182542b6c 0x182542000 + 2924
Jan 17 17:20:31 iPad-Device ReportCrash(CrashReporterSupport)[439] <Notice>: Thread 2:
0 libsystem_kernel.dylib 0x0000000182430d80 0x18240e000 + 142720
1 libsystem_pthread.dylib 0x0000000182542eec 0x182542000 + 3820
2 libsystem_pthread.dylib 0x0000000182542b6c 0x182542000 + 2924
Jan 17 17:20:31 iPad-Device ReportCrash(CrashReporterSupport)[439] <Notice>: Thread 3 name: SGen worker
Thread 3:
0 libsystem_kernel.dylib 0x00000001824300f0 0x18240e000 + 139504
1 libsystem_pthread.dylib 0x0000000182546ce4 0x182542000 + 19684
2 ArmUIIpad 0x0000000107cccb84 0x104f30000 + 47827844
3 libsystem_pthread.dylib 0x00000001825442b4 0x182542000 + 8884
4 libsystem_pthread.dylib 0x0000000182544180 0x182542000 + 8576
5 libsystem_pthread.dylib 0x0000000182542b74 0x182542000 + 2932
Jan 17 17:20:31 iPad-Device ReportCrash(CrashReporterSupport)[439] <Notice>: Thread 4 name: Finalizer
Thread 4:
0 libsystem_kernel.dylib 0x000000018240f5a4 0x18240e000 + 5540
1 ArmUIIpad 0x0000000107c09024 0x104f30000 + 47026212
2 ArmUIIpad 0x0000000107c791b0 0x104f30000 + 47485360
3 libsystem_pthread.dylib 0x00000001825442b4 0x182542000 + 8884
4 libsystem_pthread.dylib 0x0000000182544180 0x182542000 + 8576
5 libsystem_pthread.dylib 0x0000000182542b74 0x182542000 + 2932
Jan 17 17:20:31 iPad-Device ReportCrash(CrashReporterSupport)[439] <Notice>: Thread 5:
0 libsystem_pthread.dylib 0x0000000182542b68 0x182542000 + 2920
Jan 17 17:20:31 iPad-Device ReportCrash(CrashReporterSupport)[439] <Notice>: Thread 6 name: com.apple.uikit.eventfetch-thread
Thread 6:
0 libsystem_kernel.dylib 0x000000018240f568 0x18240e000 + 5480
1 libsystem_kernel.dylib 0x000000018240f3e0 0x18240e000 + 5088
2 CoreFoundation 0x00000001828c6308 0x1827d8000 + 975624
3 CoreFoundation 0x00000001828c3ed4 0x1827d8000 + 966356
4 CoreFoundation 0x00000001827e3e58 0x1827d8000 + 48728
5 Foundation 0x0000000183219594 0x18320d000 + 50580
6 Foundation 0x00000001832389ac 0x18320d000 + 178604
7 UIKit 0x000000018c9cd7b8 0x18bdf0000 + 12441528
8 Foundation 0x000000018331b0f4 0x18320d000 + 1106164
9 libsystem_pthread.dylib 0x00000001825442b4 0x182542000 + 8884
10 libsystem_pthread.dylib 0x0000000182544180 0x182542000 + 8576
11 libsystem_pthread.dylib 0x0000000182542b74 0x182542000 + 2932
Jan 17 17:20:31 iPad-Device ReportCrash(CrashReporterSupport)[439] <Notice>: Thread 7:
0 libsystem_pthread.dylib 0x0000000182542b68 0x182542000 + 2920
Jan 17 17:20:31 iPad-Device ReportCrash(CrashReporterSupport)[439] <Notice>: Thread 8 name: tid_8803
Thread 8:
0 libsystem_kernel.dylib 0x00000001824300f0 0x18240e000 + 139504
1 libsystem_pthread.dylib 0x0000000182546ce4 0x182542000 + 19684
2 ArmUIIpad 0x0000000107ce22f4 0x104f30000 + 47915764
3 ArmUIIpad 0x0000000107c6eb38 0x104f30000 + 47442744
4 ArmUIIpad 0x0000000107c791b0 0x104f30000 + 47485360
5 libsystem_pthread.dylib 0x00000001825442b4 0x182542000 + 8884
6 libsystem_pthread.dylib 0x0000000182544180 0x182542000 + 8576
7 libsystem_pthread.dylib 0x0000000182542b74 0x182542000 + 2932
Jan 17 17:20:31 iPad-Device ReportCrash(CrashReporterSupport)[439] <Notice>: Thread 9 name: Threadpool worker
Thread 9:
0 libsystem_kernel.dylib 0x00000001824300f0 0x18240e000 + 139504
1 libsystem_pthread.dylib 0x0000000182546ce4 0x182542000 + 19684
2 ArmUIIpad 0x0000000107c6f134 0x104f30000 + 47444276
3 ArmUIIpad 0x0000000107c791b0 0x104f30000 + 47485360
4 libsystem_pthread.dylib 0x00000001825442b4 0x182542000 + 8884
5 libsystem_pthread.dylib 0x0000000182544180 0x182542000 + 8576
6 libsystem_pthread.dylib 0x0000000182542b74 0x182542000 + 2932
Jan 17 17:20:31 iPad-Device ReportCrash(CrashReporterSupport)[439] <Notice>: Thread 10 name: Threadpool worker
Thread 10:
0 libsystem_kernel.dylib 0x00000001824300f0 0x18240e000 + 139504
1 libsystem_pthread.dylib 0x0000000182546ce4 0x182542000 + 19684
2 ArmUIIpad 0x0000000107c6f134 0x104f30000 + 47444276
3 ArmUIIpad 0x0000000107c791b0 0x104f30000 + 47485360
4 libsystem_pthread.dylib 0x00000001825442b4 0x182542000 + 8884
5 libsystem_pthread.dylib 0x0000000182544180 0x182542000 + 8576
6 libsystem_pthread.dylib 0x0000000182542b74 0x182542000 + 2932
Jan 17 17:20:31 iPad-Device ReportCrash(CrashReporterSupport)[439] <Notice>: Thread 0 crashed with ARM Thread State (64-bit):
x0: 0x0000000000000000 x1: 0x0000000000000000 x2: 0x0000000000000000 x3: 0x0000000000000001
x4: 0x0000000000000000 x5: 0x0000000000989680 x6: 0x0000000000000033 x7: 0xffffffffffffffec
x8: 0x0000000008000000 x9: 0x0000000004000000 x10: 0x00000000000003e8 x11: 0x00000001b5821d54
x12: 0x00000001b5821d54 x13: 0x0000000000000018 x14: 0x0000000000000001 x15: 0x0000000000000881
x16: 0x0000000000000148 x17: 0x0000000000000000 x18: 0xfffffff00f2dd260 x19: 0x0000000000000006
x20: 0x00000001b34f6b80 x21: 0x000000016aeca7b0 x22: 0x0000000000000303 x23: 0x00000001b34f6c60
x24: 0x0000000108703240 x25: 0x0000000000000002 x26: 0x000000010881d800 x27: 0x00000001056033b3
x28: 0x0000000000010001 fp: 0x000000016aec9ce0 lr: 0x00000001825452f8
sp: 0x000000016aec9cb0 pc: 0x00000001824302e8 cpsr: 0x00000000
Jan 17 17:20:31 iPad-Device backboardd(AttentionAwareness)[62] <Notice>: EventStatistics.m:48 : 8168.31355: Info: <private>since 8161.00403 (Wed Jan 17 17:20:24 2018)
Jan 17 17:20:31 iPad-Device assertiond[68] <Notice>: [ArmUIIpad:437] Port death watcher fired.
Jan 17 17:20:31 iPad-Device assertiond[68] <Notice>: Server invalidated <BKProcessAssertion: 0x101023810; "FBSceneSnapshotAction:com.myapp.name" (finishTask:180s); id:\M-b\M^@\M-&6ADC8FB2F0F4>
Jan 17 17:20:31 iPad-Device assertiond[68] <Notice>: Server invalidated <BKProcessAssertion: 0x10063eb10; "Suspending" (suspend:10s); id:\M-b\M^@\M-&A127D87B3178>
Jan 17 17:20:31 iPad-Device assertiond[68] <Notice>: Process exited: <BKProcess: 0x100529ae0; ArmUIIpad; com.myapp.name; pid: 437; agency: Application; visibility: background; task: none; hostpid: 57>
Jan 17 17:20:31 iPad-Device powerd[39] <Notice>: Process assertiond.68 Released SystemIsActive "ArmUIIpad:437:57-5D0FDB42-E7B1-4091-AC4C-6ADC8FB2F0F4 [FBSceneSnapshotAction:com.myapp.name] [0x101023810]" age:00:00:00 id:51539641844 [System: SysAct]
Jan 17 17:20:31 iPad-Device assertiond[68] <Notice>: [ArmUIIpad:437] Invalidating...
Jan 17 17:20:31 iPad-Device assertiond[68] <Notice>: Releasing PowerAssertion on ArmUIIpad:437 from invalidate
Jan 17 17:20:31 iPad-Device assertiond[68] <Notice>: Client relinquished <BKProcessAssertion: 0x101023810; "FBSceneSnapshotAction:com.myapp.name" (finishTask:180s); id:\M-b\M^@\M-&6ADC8FB2F0F4>
Jan 17 17:20:31 iPad-Device assertiond[68] <Notice>: Client relinquished <BKProcessAssertion: 0x10063eb10; "Suspending" (suspend:10s); id:\M-b\M^@\M-&A127D87B3178>
Jan 17 17:20:31 iPad-Device assertiond[68] <Notice>: [ArmUIIpad:437] dump all assertions HWM:3 (CPUMON check): {
<BKProcessAssertion: 0x101023810; "FBSceneSnapshotAction:com.myapp.name" (finishTask:180s); id:\M-b\M^@\M-&6ADC8FB2F0F4> [active]
<BKProcessAssertion: 0x10063eb10; "Suspending" (suspend:10s); id:\M-b\M^@\M-&A127D87B3178> [active]
}
Jan 17 17:20:31 iPad-Device assertiond[68] <Notice>: [ArmUIIpad:437] Ignoring assertion remove, because we are terminated or pending termination
Jan 17 17:20:31 iPad-Device assertiond[68] <Notice>: [ArmUIIpad:437] Ignoring assertion remove, because we are terminated or pending termination
Jan 17 17:20:31 iPad-Device awdd[90] <Notice>: loc.mgr:#N Marking location used by calling current location
Jan 17 17:20:31 iPad-Device awdd(CoreLocation)[90] <Notice>: {"msg":"CLLocationManager", "event":"activity", "_cmd":"location", "self":"0x105204c40"}
Jan 17 17:20:31 iPad-Device locationd[65] <Notice>: {"msg":"client getting effective client name", "clientName":"\134/System\134/Library\134/PrivateFrameworks\134/WirelessDiagnostics.framework\134/Support\134/awdd", "bundleId":"", "bundlePath":"\134/System\134/Library\134/PrivateFrameworks\134/WirelessDiagnostics.framework"}
Jan 17 17:20:31 iPad-Device assertiond[68] <Notice>: [ArmUIIpad:437] Got exit context: <BKSProcessExitContext: 0x1010210f0; reason: (none)>
Jan 17 17:20:31 iPad-Device SpringBoard(FrontBoard)[57] <Notice>: <FBApplicationProcess: 0x137033720; ArmUIIpad (com.myapp.name); pid: 437> exited.
看起来有某种崩溃，但我不确定到底发生了什么。我只看到了：
Jan 17 17:20:31 iPad-Device SpringBoard(FrontBoard)[57] <Notice>: <FBApplicationProcess: 0x137033720; ArmUIIpad (com.myapp.name); pid: 437> exited.
Jan 17 17:20:31 iPad-Device SpringBoard(FrontBoard)[57] <Notice>: [FBProcessManager] Removing: <FBApplicationProcess: 0x137033720; ArmUIIpad (com.myapp.name); pid: -1>
Jan 17 17:20:31 iPad-Device SpringBoard[57] <Notice>: Process exited: <FBApplicationProcess: 0x137033720; ArmUIIpad (com.myapp.name); pid: -1> -> <FBApplicationProcessExitContext: 0x1c884d1a0; exitReason: (none); terminationReason: (none)> {
stateAtExit = <FBProcessState: 0x1c882e360; pid: 437; taskState: Not Running; visibility: Unknown>;
}
崩溃的iPad：iPad7,4 iOS 11.2.1
没有崩溃但没有附着的iPad：iPad3,4 iOS 10.3.3
我主要使用的模拟器：iPad（第5代）11.2
你能帮我找一下问题所在吗？