Xamarin.forms: [Bug]Xamarin Forms iOS app crashes in iOS 14.2 when installed via MDM and devices enrolled with no user affinity
Description
When our app, named MedMobile (current release version 3.1) is installed via MDM ( like InTune , Applle Configurator ) on an iOS/iPad device which has been enrolled 'without user affinity' / 'with device affinity', the app fails to start under iOS 14.2.
It shows white screen and then crashes after 20 seconds. Same Configuration worked with previous OS versions, including 14.1.
The app works when installed via the App Store on iPads with iOS 14.2. App also works when installed via TestFlight on iPads with iOS 14.2
Steps to Reproduce
- Enroll iPad device in Apple Configurator or Intune running iOS 14.2 - without user affinity or as device affinity
- Install MedMobile 3.1 ( Available is Apple Business Manager) using MDM platform
- Open app
Expected Behavior
App shows activation screen
Actual Behavior
App shows white screen and the get terminated after 20 seconds
Basic Information
- Version with issue: 3.1.43510
- Last known good version: 3.0.42745
- IDE:
- Platform Target Frameworks: Xamarin Forms 4.6.0.800
- iOS: iOS 13. Minimum supported iOS 9
- Affected Devices: iPads with iOS 14.2
Screenshots
App Link on app store
https://apps.apple.com/us/app/medmobile/id1117249459
Workaround
No workaround
Crash logs
iCareHealth.Mobile.iOS-2020-11-07-212540 2020-11-08 01_11_46 .txt
Symbolicated Crash logs
iCareHealth.Mobile.iOS-2020-11-07-212540 2020-11-08 01_11_4_SYMBOLICATED.txt
akashvashisht
All 29 comments
@samhouts there are several other reports here https://forums.xamarin.com/discussion/186138/ios-14-2-app-crashes-if-deployed-via-mdm-but-not-from-appstore
cheles
on 12 Nov 2020
We have the same problem with our app.
Also, deploying it as LOB through intune works, but when using VPP released version through intune, it hangs for 15-20 seconds on "splash-screen" and then crashes.
shoyheim
on 12 Nov 2020
@shoyheim what is you Xamarin Forms version?
cheles
on 12 Nov 2020
@cheles We just rebuilt hoping to solve the problem, so we're on 4.8.0.1560, and it's built through appcenter.ms with XCode 12.1
shoyheim
on 12 Nov 2020
only Xcode 12.2 RC includes SDKs for iOS 14.2, iPadOS 14.2, tvOS 14.2, watchOS 7.1, and macOS Big Sur 11 per above link. Xcode 12.2 is currently in Beta/RC
cheles
on 12 Nov 2020
@shoyheim : Is the issue still there after you built the app with XCode 12.1 and deployed via MDM on device-affinity iPads/iPhones?
akashvashisht
on 12 Nov 2020
@akashvashisht Yes, made no difference.
Guess I'll have to try building and deploying using xcode 12.2, but I'm feeling a little hesitant to releasing using a beta-compiler...
shoyheim
on 12 Nov 2020
@shoyheim : Thanks for the confirmation !
akashvashisht
on 12 Nov 2020
I am experiencing the same issue. It occurs with Xamarin.iOS (14.4.1.3) apps as well, not just Xamarin.Forms. The app crash at launch only occurs if the app is deployed via MDM from the App Store and does not occur if the app is built as an IPA and deployed via MDM.
The following workaround resolves the app crash:
1) Deploy app via MDM.
2) Enable "Offload App" iOS feature (Settings, General, iDevice Storage, Select app, tap "Offload App")
3) Next time the app is launched it is downloaded again from the App Store and the app crash no longer occurs.
mlancione
on 12 Nov 2020
Hi all, thanks for raising this issue!
As @spouliot mentioned here in this parallel issue https://github.com/xamarin/xamarin-macios/issues/10086:
The app are build identically for AppStore / AdHoc / MDM.
The code:0x8BADF00D means the watchdog killed the app since it took too much time to startup. It's possible that some 3rd party code is trying to do something different (e.g. reach a server) and that cause an unacceptable delay.
can you open the console app and give us the logs from the device where this happens (between the app start and it's crash 20 seconds later). It's possible that either us, some 3rd party or the OS has logged warnings/errors that could shed some light on what went wrong. Thanks!
@akashvashisht if you could share your build logs that capture the crash, that would be really helpful in helping us to further investigate the issue here! Thanks again :)
rachelkang
on 12 Nov 2020
@rachelkang : Here are the crash logs :
{"app_name":"iCareHealth.Mobile.iOS","timestamp":"2020-11-07 21:25:40.00 +0800","app_version":"3.1.43510","slice_uuid":"60fc0967-b84d-315c-ba71-ce474a67af15","adam_id":1117249459,"build_version":"3.1.43510","platform":2,"bundleID":"au.com.icarehealth.medmobilepublic","share_with_app_devs":0,"is_first_party":0,"bug_type":"109","os_version":"iPhone OS 14.2 (18B92)","incident_id":"BB18EB67-F23D-40F6-8E35-084D9BC604DE","name":"iCareHealth.Mobile.iOS"}
Incident Identifier: BB18EB67-F23D-40F6-8E35-084D9BC604DE
CrashReporter Key: 01f4a30ad5120b81a8190918db639c8e952e4a79
Hardware Model: iPad11,3
Process: iCareHealth.Mobile.iOS [485]
Path: /private/var/containers/Bundle/Application/779343FC-8D5D-4E06-9474-3EE166847E7A/iCareHealth.Mobile.iOS.app/iCareHealth.Mobile.iOS
Identifier: au.com.icarehealth.medmobilepublic
Version: 3.1.43510 (3.1.43510)
AppStoreTools: 12A7402a
Code Type: ARM-64 (Native)
Role: Foreground
Parent Process: launchd [1]
Coalition: au.com.icarehealth.medmobilepublic [514]
Date/Time: 2020-11-07 21:25:39.7051 +0800
Launch Time: 2020-11-07 21:25:19.6621 +0800
OS Version: iPhone OS 14.2 (18B92)
Release Type: User
Baseband Version: n/a
Report Version: 104
Exception Type: EXC_BAD_ACCESS (SIGKILL)
Exception Subtype: UNKNOWN_0x32 at 0x000000010315c868
VM Region Info: 0x10315c868 is in 0x10315c000-0x103160000; bytes after start: 2152 bytes before end: 14231
REGION TYPE START - END [ VSIZE] PRT/MAX SHRMOD REGION DETAIL
VM_ALLOCATE 103158000-10315c000 [ 16K] rw-/rwx SM=PRV
---> mapped file 10315c000-103160000 [ 16K] r-x/r-x SM=COW ...t_id=7e0ac945
VM_ALLOCATE 103160000-103164000 [ 16K] rw-/rwx SM=PRV
Termination Reason: Namespace SPRINGBOARD, Code 0x8badf00d
Termination Description: SPRINGBOARD,
Triggered by Thread: 0
Thread 0 name: tid_407 Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 ??? 0x000000010315c868 0 + 4346726504
1 iCareHealth.Mobile.iOS 0x000000010131eb40 0x100f44000 + 4041536
2 iCareHealth.Mobile.iOS 0x000000010290570c 0x100f44000 + 27006732
3 iCareHealth.Mobile.iOS 0x00000001029c0dc0 0x100f44000 + 27774400
4 iCareHealth.Mobile.iOS 0x000000010295c834 0x100f44000 + 27363380
5 iCareHealth.Mobile.iOS 0x000000010295c690 0x100f44000 + 27362960
6 iCareHealth.Mobile.iOS 0x000000010292cd8c 0x100f44000 + 27168140
7 iCareHealth.Mobile.iOS 0x000000010292c3cc 0x100f44000 + 27165644
8 iCareHealth.Mobile.iOS 0x0000000102904f9c 0x100f44000 + 27004828
9 iCareHealth.Mobile.iOS 0x00000001028e6f10 0x100f44000 + 26881808
10 iCareHealth.Mobile.iOS 0x0000000102aa0b9c 0x100f44000 + 28691356
11 iCareHealth.Mobile.iOS 0x0000000100fa8c04 0x100f44000 + 412676
12 libdyld.dylib 0x00000001a92076c0 0x1a9206000 + 5824
Thread 1:
0 libsystem_pthread.dylib 0x00000001f1d4b754 0x1f1d41000 + 42836
Thread 2 name: SGen worker
Thread 2:
0 libsystem_kernel.dylib 0x00000001d5e451ac 0x1d5e1d000 + 164268
1 libsystem_pthread.dylib 0x00000001f1d46458 0x1f1d41000 + 21592
2 iCareHealth.Mobile.iOS 0x0000000102a6417c 0x100f44000 + 28443004
3 libsystem_pthread.dylib 0x00000001f1d42b40 0x1f1d41000 + 6976
4 libsystem_pthread.dylib 0x00000001f1d4b768 0x1f1d41000 + 42856
Thread 0 crashed with ARM Thread State (64-bit):
x0: 0x0000000103700048 x1: 0x0000000103700018 x2: 0x0000000000000000 x3: 0x0000000000000000
x4: 0x0000000000000000 x5: 0x0000000000000000 x6: 0x0000000000000000 x7: 0x0000000000000000
x8: 0x0000000000000000 x9: 0x00000001028ee8d4 x10: 0x00000000000000e2 x11: 0x0000000030144000
x12: 0x00000000fffffffd x13: 0x0000010000000000 x14: 0x000000016eebaaf8 x15: 0x000000016eebab40
x16: 0x000000010315c868 x17: 0x000000010104dee0 x18: 0x0000000000000000 x19: 0x000000016eebab50
x20: 0x000000016eebaea0 x21: 0x0000000000000000 x22: 0x0000000000000001 x23: 0x000000016eebaa90
x24: 0x000000016eebab40 x25: 0x000000010581b550 x26: 0x0000000280ab8280 x27: 0x0000000102ba21f8
x28: 0x000000010581b560 fp: 0x000000016eeba9f0 lr: 0x000000010104defc
sp: 0x000000016eeba9f0 pc: 0x000000010315c868 cpsr: 0x60000000
esr: 0x8200000f (Instruction Abort) Permission fault
Binary Images:
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0x1ebd1c000 - 0x1ebde5fff VoiceTrigger arm64e <230337c7b5143f3e903bd333237cb71f> /System/Library/PrivateFrameworks/VoiceTrigger.framework/VoiceTrigger
0x1ebeac000 - 0x1ebeadfff WatchdogClient arm64e <69e04563b89834cda36b91aa7fc5076b> /System/Library/PrivateFrameworks/WatchdogClient.framework/WatchdogClient
0x1ec194000 - 0x1ec8d0fff libwebrtc.dylib arm64e <4505d3294bbd38fea867f0f9114e55b0> /System/Library/PrivateFrameworks/WebCore.framework/Frameworks/libwebrtc.dylib
0x1ec94f000 - 0x1ec966fff WebUI arm64e <45f510c9f7813aad9cea0a8b4d38fc56> /System/Library/PrivateFrameworks/WebUI.framework/WebUI
0x1ecea7000 - 0x1eceaafff XCTTargetBootstrap arm64e
0x1ecf2e000 - 0x1ecf4dfff caulk arm64e
0x1ef4c2000 - 0x1ef4c7fff kperf arm64e <08ef6ced017e334dbfb52a12f911cc49> /System/Library/PrivateFrameworks/kperf.framework/kperf
0x1ef4c8000 - 0x1ef4d0fff kperfdata arm64e
0x1ef4d1000 - 0x1ef4e7fff libEDR arm64e <92fae9563a1e3aa49562c9ec8d93f705> /System/Library/PrivateFrameworks/libEDR.framework/libEDR
0x1ef500000 - 0x1ef511fff perfdata arm64e
0x1ef512000 - 0x1ef543fff vCard arm64e
0x1efe72000 - 0x1efeaefff libAWDSupport.dylib arm64e
0x1efeaf000 - 0x1f026afff libAWDSupportFramework.dylib arm64e <6005634d8044335099a30c7269ac6215> /usr/lib/libAWDSupportFramework.dylib
0x1f03ed000 - 0x1f03fcfff libAudioStatistics.dylib arm64e
0x1f059c000 - 0x1f05cffff libCRFSuite.dylib arm64e
0x1f05d0000 - 0x1f05d1fff libCTGreenTeaLogger.dylib arm64e <748efb072c4f3afaa2dafd33fe75d7d7> /usr/lib/libCTGreenTeaLogger.dylib
0x1f05d2000 - 0x1f05dcfff libChineseTokenizer.dylib arm64e <83ce9fc370093b4e89580e4e79515060> /usr/lib/libChineseTokenizer.dylib
0x1f0893000 - 0x1f089afff libIOReport.dylib arm64e <06af496860ad388fb6c71aadaf1ec289> /usr/lib/libIOReport.dylib
0x1f0911000 - 0x1f0918fff libMatch.1.dylib arm64e <013fc0b90d5733a38c5fcafb4f531ca3> /usr/lib/libMatch.1.dylib
0x1f0a2a000 - 0x1f0a2bfff libThaiTokenizer.dylib arm64e <26ff6d4218fa3564ae85769e475085fe> /usr/lib/libThaiTokenizer.dylib
0x1f0ca0000 - 0x1f0ca2fff libapp_launch_measurement.dylib arm64e <60872b49564b34dba96053ff633a44d7> /usr/lib/libapp_launch_measurement.dylib
0x1f0ca3000 - 0x1f0cb9fff libapple_nghttp2.dylib arm64e
0x1f0cba000 - 0x1f0d4bfff libate.dylib arm64e
0x1f0ddd000 - 0x1f0dedfff libbsm.0.dylib arm64e
0x1f0dee000 - 0x1f0dfafff libbz2.1.0.dylib arm64e
0x1f0dfb000 - 0x1f0dfbfff libcharset.1.dylib arm64e
0x1f0dfc000 - 0x1f0e0dfff libcmph.dylib arm64e <100ce5367c1531e093feb698ed397d75> /usr/lib/libcmph.dylib
0x1f0e0e000 - 0x1f0e25fff libcompression.dylib arm64e
0x1f0e26000 - 0x1f0e3cfff libcoretls.dylib arm64e <5a15ba424e8c32c1852b6bf5b0b9f5e6> /usr/lib/libcoretls.dylib
0x1f0e3d000 - 0x1f0e3efff libcoretls_cfhelpers.dylib arm64e <6b34095b1eb73897a7ce5cd164b1ba59> /usr/lib/libcoretls_cfhelpers.dylib
0x1f0e62000 - 0x1f0e69fff libcupolicy.dylib arm64e <5fd954ea46503268a79279937ba46fae> /usr/lib/libcupolicy.dylib
0x1f0e6a000 - 0x1f0e71fff libdns_services.dylib arm64e <1e6278dfd78a3cfda791ec582596d6ab> /usr/lib/libdns_services.dylib
0x1f0e72000 - 0x1f0e8ffff libedit.3.dylib arm64e <6ad9bd206dd935d6825ed286b68e50c3> /usr/lib/libedit.3.dylib
0x1f0e90000 - 0x1f0e90fff libenergytrace.dylib arm64e <1f82a4e41bb13b2bbec15c8fa895bcae> /usr/lib/libenergytrace.dylib
0x1f0e91000 - 0x1f0eaafff libexpat.1.dylib arm64e <0337d28ff1203b9785468cf81228b4f4> /usr/lib/libexpat.1.dylib
0x1f0ed7000 - 0x1f0edbfff libgermantok.dylib arm64e <616d3bc7c70031c8b64cac33f622f695> /usr/lib/libgermantok.dylib
0x1f0edc000 - 0x1f0ee1fff libheimdal-asn1.dylib arm64e <2cf60e4c59493c18991607cfd599cc25> /usr/lib/libheimdal-asn1.dylib
0x1f0ee2000 - 0x1f0fd7fff libiconv.2.dylib arm64e <96c33c0a1c3e36129f5f9c5a06aa8ee6> /usr/lib/libiconv.2.dylib
0x1f0ff6000 - 0x1f0ff7fff liblangid.dylib arm64e
0x1f0ff8000 - 0x1f1003fff liblockdown.dylib arm64e <9d9e7c37660e30a1a876d6033629fcc0> /usr/lib/liblockdown.dylib
0x1f1004000 - 0x1f101cfff liblzma.5.dylib arm64e <0bcf3933a36f3b92abee3c5b5476b489> /usr/lib/liblzma.5.dylib
0x1f104b000 - 0x1f10a0fff libmecab.dylib arm64e
0x1f10a1000 - 0x1f12d8fff libmecabra.dylib arm64e <51b1d8e4aa9a3b8fb09571b4290539c4> /usr/lib/libmecabra.dylib
0x1f12d9000 - 0x1f12ebfff libmis.dylib arm64e
0x1f12ec000 - 0x1f1301fff libnetworkextension.dylib arm64e
0x1f16ac000 - 0x1f16e6fff libpcap.A.dylib arm64e <1a8ae5ac32ba3816a9b5917e402a1515> /usr/lib/libpcap.A.dylib
0x1f16e7000 - 0x1f16f5fff libperfcheck.dylib arm64e <76d92bc0ad533f27a19d6fc816595eeb> /usr/lib/libperfcheck.dylib
0x1f16fd000 - 0x1f170ffff libprequelite.dylib arm64e <0769f4c5597d3a8cabb3dd2f4150832b> /usr/lib/libprequelite.dylib
0x1f1710000 - 0x1f1722fff libprotobuf-lite.dylib arm64e
0x1f1723000 - 0x1f1785fff libprotobuf.dylib arm64e <6bae89e501373fcba31ec70c089f6281> /usr/lib/libprotobuf.dylib
0x1f17e6000 - 0x1f17fefff libresolv.9.dylib arm64e <543fc2cd008c3ead84a72f434ea8f8e7> /usr/lib/libresolv.9.dylib
0x1f17ff000 - 0x1f1801fff libsandbox.1.dylib arm64e <56c512172a463088bb0b92b35f973c32> /usr/lib/libsandbox.1.dylib
0x1f184b000 - 0x1f184efff libutil.dylib arm64e
0x1f184f000 - 0x1f193afff libxml2.2.dylib arm64e <69f58a5d55e3350384fc69de109a27b8> /usr/lib/libxml2.2.dylib
0x1f193f000 - 0x1f1968fff libxslt.1.dylib arm64e
0x1f1969000 - 0x1f197afff libz.1.dylib arm64e
0x1f1bcc000 - 0x1f1bd1fff libcache.dylib arm64e
0x1f1bd2000 - 0x1f1bdffff libcommonCrypto.dylib arm64e
0x1f1be0000 - 0x1f1be3fff libcompiler_rt.dylib arm64e <94009075862d337481ebc6ce2f19c920> /usr/lib/system/libcompiler_rt.dylib
0x1f1be4000 - 0x1f1becfff libcopyfile.dylib arm64e
0x1f1ccc000 - 0x1f1cccfff liblaunch.dylib arm64e <910b87c7ffbc3870ad492c33c6bac42f> /usr/lib/system/liblaunch.dylib
0x1f1ccd000 - 0x1f1cd2fff libmacho.dylib arm64e <6135fd257d293340b73a89f4f47bebc0> /usr/lib/system/libmacho.dylib
0x1f1cd3000 - 0x1f1cd5fff libremovefile.dylib arm64e
0x1f1cd6000 - 0x1f1cd7fff libsystem_blocks.dylib arm64e <0264eb2280a734bb89228396234ae825> /usr/lib/system/libsystem_blocks.dylib
0x1f1cd8000 - 0x1f1cdafff libsystem_collections.dylib arm64e <511397d6929531aea7e0a3dd5eb3dd22> /usr/lib/system/libsystem_collections.dylib
0x1f1cdb000 - 0x1f1cdffff libsystem_configuration.dylib arm64e
0x1f1ce0000 - 0x1f1cf2fff libsystem_containermanager.dylib arm64e
0x1f1cf3000 - 0x1f1cf4fff libsystem_coreservices.dylib arm64e
0x1f1cf5000 - 0x1f1cfefff libsystem_darwin.dylib arm64e <3811e6bc768d37d3ab928af58f302dd9> /usr/lib/system/libsystem_darwin.dylib
0x1f1cff000 - 0x1f1d07fff libsystem_dnssd.dylib arm64e
0x1f1d08000 - 0x1f1d0afff libsystem_featureflags.dylib arm64e
0x1f1d0b000 - 0x1f1d38fff libsystem_m.dylib arm64e <588d2652ea2d38ca87da2abd2d4d2a13> /usr/lib/system/libsystem_m.dylib
0x1f1d39000 - 0x1f1d3ffff libsystem_platform.dylib arm64e <73f3e4590f823377a7d1ef05cae41c0a> /usr/lib/system/libsystem_platform.dylib
0x1f1d40000 - 0x1f1d40fff libsystem_product_info_filter.dylib arm64e <1ac730a9de2f32dfa875392aa0007ef2> /usr/lib/system/libsystem_product_info_filter.dylib
0x1f1d41000 - 0x1f1d4cfff libsystem_pthread.dylib arm64e <677a4a3539f3303e8c653fa891a75caf> /usr/lib/system/libsystem_pthread.dylib
0x1f1d4d000 - 0x1f1d50fff libsystem_sandbox.dylib arm64e <4e4d7b23761d3615acb01746f670d335> /usr/lib/system/libsystem_sandbox.dylib
0x1f1d51000 - 0x1f1d5bfff libunwind.dylib arm64e <056b2b8f555b3f75a9a98b6c42648ddd> /usr/lib/system/libunwind.dylib
0x1f1d5c000 - 0x1f1d92fff libxpc.dylib arm64e <71a903b4e73136b6bfdaba9e03b53e8c> /usr/lib/system/libxpc.dylib
0x1f2a5c000 - 0x1f2a6efff SpotlightLinguistics arm64e
EOF
akashvashisht
on 12 Nov 2020
@rachelkang : These are the symbolicated logs :
tid_407 Dispatch queue: com.apple.main-thread (0)
0 (null) in 0 ()
1 (null) in plcrash::MS::async::dwarf_cfa_state_iterator::next+ 4041536 (unsigned int, plcrash::MS::async::plcrash_dwarf_cfa_reg_rule_t, unsigned long long*) ()
2 (null) in plcrash::MS::async::dwarf_cfa_state_iterator::next+ 27006732 (unsigned int, plcrash::MS::async::plcrash_dwarf_cfa_reg_rule_t, unsigned long long*) ()
3 (null) in plcrash::MS::async::dwarf_cfa_state_iterator::next+ 27774400 (unsigned int, plcrash::MS::async::plcrash_dwarf_cfa_reg_rule_t, unsigned long long*) ()
4 (null) in plcrash::MS::async::dwarf_cfa_state_iterator::next+ 27363380 (unsigned int, plcrash::MS::async::plcrash_dwarf_cfa_reg_rule_t, unsigned long long*) ()
5 (null) in plcrash::MS::async::dwarf_cfa_state_iterator::next+ 27362960 (unsigned int, plcrash::MS::async::plcrash_dwarf_cfa_reg_rule_t, unsigned long long*) ()
6 (null) in plcrash::MS::async::dwarf_cfa_state_iterator::next+ 27168140 (unsigned int, plcrash::MS::async::plcrash_dwarf_cfa_reg_rule_t, unsigned long long*) ()
7 (null) in plcrash::MS::async::dwarf_cfa_state_iterator::next+ 27165644 (unsigned int, plcrash::MS::async::plcrash_dwarf_cfa_reg_rule_t, unsigned long long*) ()
8 (null) in plcrash::MS::async::dwarf_cfa_state_iterator::next+ 27004828 (unsigned int, plcrash::MS::async::plcrash_dwarf_cfa_reg_rule_t, unsigned long long*) ()
9 (null) in plcrash::MS::async::dwarf_cfa_state_iterator::next+ 26881808 (unsigned int, plcrash::MS::async::plcrash_dwarf_cfa_reg_rule_t, unsigned long long*) ()
10 (null) in xamarin_release_block_on_main_thread ()
11 (null) in plcrash::MS::async::dwarf_cfa_state_iterator::next+ 412676 (unsigned int, plcrash::MS::async::plcrash_dwarf_cfa_reg_rule_t, unsigned long long*) ()
12 (null) in 0x18562e000 ()
Thread 1
0 (null) in 0x1ce169000 ()
SGen worker (2)
0 (null) in 0x1b2245000 ()
1 (null) in 0x1ce169000 ()
2 (null) in plcrash::MS::async::dwarf_cfa_state_iterator::next+ 28443004 (unsigned int, plcrash::MS::async::plcrash_dwarf_cfa_reg_rule_t, unsigned long long*) ()
3 (null) in 0x1ce169000 ()
4 (null) in 0x1ce169000 ()
akashvashisht
on 12 Nov 2020
@mlancione : We tried your workaround after deploying the app via InTune and also tried via Apple Configurator and we don't see our app in the list of apps which can be offloaded.
It's deployed on iPads which are enrolled with device-affinity
akashvashisht
on 12 Nov 2020
The logs still seem to indicate that watchdog is terminating the application due to it taking > 20s to launch. Can you help provide more context around what your app is doing in the AppDelegate and Forms startup?
Redth
on 12 Nov 2020
I am experiencing the same issue with an application, the live version has been live for a while but since the 14.2 release, clients using an MDM deployment have been unable to run the application. As the OP says, if the App is downloaded from the app store, or the work around above is used, they can run the application. The behaviour (runs on <= 14.1 via various MDM solutions, but not on 14.2, and runs on all versions via App Store) has been confirmed. This is affecting multiple airline businesses who use the app.
Its almost as if the MDM installed version is now failing a permission check, where as the Store installed version is fine (They are the same binary signed with different certs). The version available to users was built using Xamarin,iOS 13.20 and XCode 11.7 (I haven't updated to XCode 12 due to a number of issues relating to multitasking). Start up time is usually about 3 seconds. The logs are showing the same watchdog shutting the app down after 20s. It seems very odd that 14.1 is fine and 14.2 is an issue.
RobertPeppin
on 12 Nov 2020
@RobertPeppin, yep, same issue as ours, by the sounds of it. Is your MDM deployment enrolling the device without user affinity? (i.e. with device affinity; no Apple ID associated with the devices). This seems to be significant in our case. The app works when installed via MDM with user affinity, but crashes when installed without user affinity.
stewart-rae
on 13 Nov 2020
@Redth , here is the startup code in our AppDelegate:
[Register("AppDelegate")]
public partial class AppDelegate : global::Xamarin.Forms.Platform.iOS.FormsApplicationDelegate
{
private App _app;
public override bool FinishedLaunching(UIApplication app, NSDictionary options)
{
#if DEBUG
System.Net.ServicePointManager.ServerCertificateValidationCallback = ValidateServerCertificate;
#endif
Forms.Init();
Forms.ViewInitialized += delegate (object sender, ViewInitializedEventArgs e)
{
if (null != e.View.StyleId)
{
e.NativeView.AccessibilityIdentifier = e.View.StyleId;
}
};
var version = NSBundle.MainBundle.InfoDictionary[new NSString("CFBundleVersion")].ToString();
_app = new App(version);
LoadApplication(_app);
return base.FinishedLaunching(app, options);
}
private static bool ValidateServerCertificate(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
{
// Any custom certificate validation checks can be done here,
// e.g. interrogating the certificate of the SSL policy errors.
// To get the system to ignore any certificate errors, just return true.
return true;
}
}
Also, potentially of significance:
The app call AppCenter.Start() as soon as it is loaded to register the app with Microsoft AppCenter for crash logs and telemetry, however the app start is never recorded in the AppCenter. The call to AppCenter.Start may not be finishing, perhaos
The app accesses the file system on the device to create a SQLite database.
It is perhaps related to permissions in some way? Just a hunch. We see this in the app crash:
Exception Type: EXC_BAD_ACCESS (SIGKILL)
Exception Subtype: UNKNOWN_0x32 at 0x0000000106570868
VM Region Info: 0x106570868 is in 0x106570000-0x106574000; bytes after start: 2152 bytes before end: 14231
REGION TYPE START - END [ VSIZE] PRT/MAX SHRMOD REGION DETAIL
VM_ALLOCATE 10656c000-106570000 [ 16K] rw-/rwx SM=PRV
---> mapped file 106570000-106574000 [ 16K] r-x/r-x SM=COW ...t_id=9267310b
VM_ALLOCATE 106574000-106578000 [ 16K] rw-/rwx SM=PRV
Termination Reason: Namespace SPRINGBOARD, Code 0x8badf00d
Termination Description: SPRINGBOARD, <RBSTerminateContext| domain:10 code:0x8BADF00D explanation:process-launch watchdog transgression: application<REDACTED>:555 exhausted real (wall clock) time allowance of 20.00 seconds | ProcessVisibility: Foreground | ProcessState: Running | WatchdogEvent: process-launch | WatchdogVisibility: Foreground | WatchdogCPUStatistics: ( | "Elapsed total CPU time (seconds): 32.050 (user 32.050, system 0.000), 27% CPU", | "Elapsed application CPU time (seconds): 19.973, 17% CPU" | ) reportType:CrashLog maxTerminationResistance:Interactive>
Triggered by Thread: 0
Thread 0 name: tid_407 Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 ??? 0x0000000106570868 0 + 4401334376
1 REDACTED.Mobile.iOS 0x0000000104712b40 0x104338000 + 4041536
... snip ...
Thread 1:
0 libsystem_pthread.dylib 0x00000001ce173754 0x1ce169000 + 42836
Thread 2 name: SGen worker
Thread 2:
0 libsystem_kernel.dylib 0x00000001b226d1ac 0x1b2245000 + 164268
1 libsystem_pthread.dylib 0x00000001ce16e458 0x1ce169000 + 21592
2 REDACTED.Mobile.iOS 0x0000000105e5817c 0x104338000 + 28443004
3 libsystem_pthread.dylib 0x00000001ce16ab40 0x1ce169000 + 6976
4 libsystem_pthread.dylib 0x00000001ce173768 0x1ce169000 + 42856
Thread 0 crashed with ARM Thread State (64-bit):
x0: 0x0000000108b00048 x1: 0x0000000108b00018 x2: 0x0000000000000000 x3: 0x0000000000000000
x4: 0x0000000000000000 x5: 0x0000000000000000 x6: 0x0000000000000000 x7: 0x0000000000000000
x8: 0x0000000000000000 x9: 0x0000000105ce28d4 x10: 0x00000000000000e2 x11: 0x0000000030144000
x12: 0x00000000fffffffd x13: 0x0000010000000000 x14: 0x000000016bac6af8 x15: 0x000000016bac6b40
x16: 0x0000000106570868 x17: 0x0000000104441ee0 x18: 0x0000000000000000 x19: 0x000000016bac6b50
x20: 0x000000016bac6ea0 x21: 0x0000000000000000 x22: 0x0000000000000001 x23: 0x000000016bac6a90
x24: 0x000000016bac6b40 x25: 0x000000010901a550 x26: 0x0000000283363750 x27: 0x0000000105f961f8
x28: 0x000000010901a560 fp: 0x000000016bac69f0 lr: 0x0000000104441efc
sp: 0x000000016bac69f0 pc: 0x0000000106570868 cpsr: 0x60000000
esr: 0x8200000f (Instruction Abort) Permission fault
... perhaps the 'Permission fault' and mapped file 'r-x/r-x' permissions are significant here?
stewart-rae
on 13 Nov 2020
@spouliot any ideas?
Also is it possible to post some of the ctor of your App class?
Redth
on 13 Nov 2020
@stewart-rae would it be possible to re-build/deploy w/MDM your app without AppCenter ? Ideally removing the dependency (so nothing from the binaries is part of the app bundle) but it might be simpler just to comment the code first.
(Instruction Abort) Permission fault sounds like file permission but it's not. It's the MPU (Memory Protection Unit) that's not happy. It might not mean anything since we don't know the state of the process when the watchdog killed the process.
spouliot
on 13 Nov 2020
@spouliot We are experiencing this crash and do not use AppCenter.
mlancione
on 13 Nov 2020
@mlancione can you share your build logs ? many solutions are using common libraries (e.g. PLCrashReporter) so what I'm most curious is to avoid anything that could be MDM aware.
spouliot
on 13 Nov 2020
@spouliot Sure. Can this be done directly to you via email or via another private channel?
mlancione
on 13 Nov 2020
@mlancione [email protected] thanks!
spouliot
on 13 Nov 2020
Our App constructor looks like this:
public class AppStarter
{
private readonly string _appVersion;
public AppStarter(string appVersion = "")
{
_appVersion = appVersion;
}
private NavigationPage InitializeAsync()
{
var appVersioningService = SimpleIoc.Default.GetInstance<IAppVersioningService>();
appVersioningService.VersionNumber = _appVersion;
... snip code that initialises navigation ...
// Create the main page, based on whether the device is activated or not.
var activationService = SimpleIoc.Default.GetInstance<IActivationService>();
var navPage = activationService.IsDeviceActive()
? new NavigationPage(SimpleIoc.Default.GetInstance<LoginPage>())
: new NavigationPage(SimpleIoc.Default.GetInstance<ActivationPage>());
// Use initialise the navigation service and dialog service with the main page instance
navInit.Initialize(navPage);
dialog.Initialize(navPage);
return navPage;
}
public NavigationPage BootStrap()
{
// Ensures that the service locator uses our IOC framework, SimpleIoc.Default.
ViewModelLocator.ConfigureViewModelLocator();
// Register all the components in our IOC container.
IocConfig.Configure();
// Initialise the database, create all the tables in SQLite.
DbSetup.Initialize(new SQLiteProvider());
return InitializeAsync();
}
}
public partial class App//:IAsyncInitialization
{
private readonly string _appVersion;
private static ViewModelLocator _locator;
public delegate void GlobalEventHandler(string param, object item = null);
public static GlobalEventHandler OnGlobalEvent;
... snip a couple of get/set properties ...
public App(string appVersion)
{
_appVersion = appVersion;
InitializeComponent();
var appStarter = new AppStarter(_appVersion);
this.MainPage = appStarter.BootStrap();
}
protected override void OnStart()
{
.. snip ..
}
protected override void OnSleep()
{
... snip...
}
protected override void OnResume()
{
... snip ...
}
}
Not sure if it helps: I'm working at Microsoft and have 2 customer apps affected by this. In both cases the apps are built by Microsoft. So it is easy to give you access to the full apps and source code internally.
None of the apps are using a MDM SDK.
One app is reading AppConfig, the other not.
The only libaries in common are Xamarin.Forms and Xamarin.Core.
Both apps use sqlite but different libs: SQLitePCLRaw.bundle_e_sqlite3 and SQLitePCLRaw.bundle_green
I have the impression that the app crashes before any Xamarin.Forms, SQlite or AppConfig code is invoked.
DerPate2010
on 13 Nov 2020
@DerPate2010 thanks, you can reach me with my email from https://github.com/xamarin/Xamarin.Forms/issues/12811#issuecomment-726439600
We're still going thru data we gathered. Additional data is still welcome :)
spouliot
on 13 Nov 2020
Everyone Please file a feedback ticket with Apple with your specific information.
Also make sure to link this https://feedbackassistant.apple.com/feedback/8895585 ticket (in the text) so they can all be seen as a single issue.
Thanks!
spouliot
on 13 Nov 2020
Please use https://github.com/xamarin/xamarin-macios/issues/10086 if you want to add any other public information to this issue.
spouliot
on 13 Nov 2020
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I am experiencing the same issue. It occurs with Xamarin.iOS (14.4.1.3) apps as well, not just Xamarin.Forms. The app crash at launch only occurs if the app is deployed via MDM from the App Store and does not occur if the app is built as an IPA and deployed via MDM.
The following workaround resolves the app crash:
1) Deploy app via MDM.
2) Enable "Offload App" iOS feature (Settings, General, iDevice Storage, Select app, tap "Offload App")
3) Next time the app is launched it is downloaded again from the App Store and the app crash no longer occurs.