Crash when instantiating new instance of realm

[dheeraj-singh511]

Goals

App should not crash

Expected Results

App should not crash

Actual Results

App crashed when trying to instantiate new instance of realm using try Realm()

Stack trace

Incident Identifier: 3660b9c1-2382-412d-9809-1ae5a2ae406b
CrashReporter Key: E46940E5-4517-44EB-B171-AFB50593EBCC
Hardware Model: iPhone8,2
Process: MyApp [388]
Path: /private/var/containers/Bundle/Application/02283985-9BA3-4E62-AD57-5F13D282E65A/MyApp.app/MyApp
Identifier: com.myApp.phone2
Version: 4.0.966 (4.0.966)
Code Type: arm64
Parent Process: ??? [1]

Date/Time: 2020-09-27T17:42:55.999Z
Launch Time: 2020-09-27T17:24:25Z
OS Version: iPhone OS 13.7 (17H35)
Report Version: 104

Exception Type: SIGSEGV
Exception Codes: SEGV_ACCERR at 0x93e035778
Crashed Thread: 25

Thread 25 Crashed:
0 Realm 0x0000000104283898 long long realm::Array::get<64ul>(unsigned long) const + 4
1 Realm 0x00000001040d575c non-virtual thunk to realm::Array::get_child_ref(unsigned long) const (array.hpp:1087)
2 Realm 0x00000001043bebdc realm::Table::init(unsigned long, realm::ArrayParent*, unsigned long, bool, bool) + 448
3 Realm 0x000000010431a744 realm::Group::create_table_accessor(unsigned long) + 752
4 Realm 0x000000010431a3f4 realm::Group::do_get_table(unsigned long) + 92
5 Realm 0x00000001040e976c realm::ObjectSchema::ObjectSchema(realm::Group const&, realm::StringData, realm::TableKey) (group.hpp:1169)
6 Realm 0x00000001040f0d08 realm::ObjectStore::schema_from_group(realm::Group const&) (memory:1826)
7 Realm 0x00000001041d454c realm::Realm::read_schema_from_group_if_needed() (shared_realm.cpp:204)
8 Realm 0x00000001041d4364 realm::Realm::Realm(realm::Realm::Config, realm::util::Optionalrealm::VersionID, std::__1::shared_ptrrealm::_impl::RealmCoordinator, realm::Realm::MakeSharedTag) (shared_realm.cpp:68)
9 Realm 0x000000010410517c std::*1::shared_ptrrealm::Realm std::*1::shared_ptrrealm::Realm::make_shared<realm::Realm::Config, realm::util::Optionalrealm::VersionID, std::*1::shared_ptrrealm::_impl::RealmCoordinator, realm::Realm::MakeSharedTag>(realm::Realm::Config&&, realm::util::Optionalrealm::VersionID&&, std::*1::shared_ptrrealm::_impl::RealmCoordinator&&, realm::Realm::MakeSharedTag&&) (memory:2156)
10 Realm 0x00000001040fecf8 realm::_impl::RealmCoordinator::do_get_realm(realm::Realm::Config, std::__1::shared_ptrrealm::Realm&, realm::util::Optionalrealm::VersionID, realm::util::CheckedUniqueLock&) (memory:4710)
11 Realm 0x00000001040feaa0 realm::_impl::RealmCoordinator::get_realm(realm::Realm::Config, realm::util::Optionalrealm::VersionID) (realm_coordinator.cpp:264)
12 Realm 0x00000001041d4ccc realm::Realm::get_shared_realm(realm::Realm::Config) (shared_realm.cpp:144)
13 Realm 0x00000001041a3fc4 +[RLMRealm realmWithConfiguration:queue:error:] (RLMRealm.mm:504)
14 RealmSwift 0x0000000104929314 RealmSwift.Realm.init(queue: __C.OS_dispatch_queue?) throws > RealmSwift.Realm (<compilergenerated>:0)
15 MyApp 0x0000000102e0fe88 function signature specialization <Arg[0] = Dead> of generic specialization <MyApp.MStoreDate> of MyApp.UnifiedDatabase.(realm in _15EE5ABE828ED209C1CFF5BDEB0C36C4).getter : RealmSwift.Realm? (UnifiedDatabase.swift:30)
16 MyApp 0x0000000102540778 MyApp.CallLogsDao.getUnSeenCallLogsCount() > Swift.Int (<compilergenerated>:0)
17 MyApp 0x000000010254b140 closure #1 (MyApp.UnifiedDatabase<MyApp.CallLogEntry>.ModelResult) -> RxSwift.Observable<Swift.Int> in MyApp.CallLogsDao.(unseenCallLogsObservable in _1CBF34422121120377EAA44982ED4E49).getter : RxSwift.Observable<Swift.Int> (CallLogsDao.swift:257)
18 MyApp 0x000000010254d988 partial apply forwarder for reabstraction thunk helper from @escaping @callee_guaranteed (@guaranteed MyApp.UnifiedDatabase<MyApp.CallLogEntry>.ModelResult) -> (@owned RxSwift.Observable<Swift.Int>, @error @owned Swift.Error) to @escaping @callee_guaranteed (@in_guaranteed MyApp.UnifiedDatabase<MyApp.CallLogEntry>.ModelResult) > (@out RxSwift.Observable<Swift.Int>, @error @owned Swift.Error) (<compilergenerated>:0)
19 RxSwift 0x0000000104d6770c RxSwift.(FlatMapSink in _DDEA0423368B3B462AE46699A4D080E1).performMap(A) throws -> B (Merge.swift:352)
20 RxSwift 0x0000000104d66e5c RxSwift.(MergeSink in _DDEA0423368B3B462AE46699A4D080E1).on(RxSwift.Event) -> () (Merge.swift:443)
21 RxSwift 0x0000000104d67db4 protocol witness for RxSwift.ObserverType.on(RxSwift.Event<A.Element>) > () in conformance RxSwift.(MergeSink in _DDEA0423368B3B462AE46699A4D080E1)<A, B, C> : RxSwift.ObserverType in RxSwift (<compilergenerated>:0)
22 RxSwift 0x0000000104d6f794 partial apply forwarder (:0)
23 RxSwift 0x0000000104d8b9c0 partial apply forwarder for reabstraction thunk helper <A1 where A == A1.Element, A1: RxSwift.ObserverType> from @escaping @callee_guaranteed (@in_guaranteed RxSwift.Event) -> () to @escaping @callee_guaranteed (@in_guaranteed RxSwift.Event) > (@out ()) (<compilergenerated>:0)
24 RxSwift 0x0000000104d8a960 merged RxSwift.(ShareReplay1WhileConnectedConnection in _E9FE621655D67A613BF2FC2D9B3041FC).on(RxSwift.Event) -> () + 296
25 RxSwift 0x0000000104d8a3d4 protocol witness for RxSwift.ObserverType.on(RxSwift.Event<A.Element>) > () in conformance RxSwift.(ShareReplay1WhileConnectedConnection in _E9FE621655D67A613BF2FC2D9B3041FC) : RxSwift.ObserverType in RxSwift (<compilergenerated>:0)
26 RxSwift 0x0000000104d6ddc0 RxSwift.(ObserveOnSink in 277A93ABA8477198C125F3F26B2D4B62).run((), (()) > ()) > () (ObserveOn.swift:117)
27 RxSwift 0x0000000104d6f000 partial apply forwarder for reabstraction thunk helper from @escaping @callee_guaranteed (@unowned @callee_guaranteed () -> ()) > () to @escaping @callee_guaranteed (@in_guaranteed (), @unowned @callee_guaranteed (@in_guaranteed ()) > ()) > () (<compilergenerated>:0)
28 RxSwift 0x0000000104d7cdf0 partial apply forwarder for reabstraction thunk helper from @escaping @callee_guaranteed (@in_guaranteed A, @unowned @callee_guaranteed (@in_guaranteed A) -> ()) > () to @escaping @callee_guaranteed (@in_guaranteed A, @in_guaranteed @callee_guaranteed (@in_guaranteed A) > (@out ())) > (@out ()) (<compilergenerated>:0)
29 RxSwift 0x0000000104d7c728 closure #1 (A) -> RxSwift.Disposable in RxSwift.RecursiveImmediateScheduler.schedule(A) > () (<compilergenerated>:0)
30 RxSwift 0x0000000104d54e98 closure #1 () -> () in RxSwift.DispatchQueueConfiguration.schedule(: A, action: (A) > RxSwift.Disposable) > RxSwift.Disposable (DispatchQueueConfiguration.swift:27)
31 RxSwift 0x0000000104d4801c reabstraction thunk helper from @escaping @callee_guaranteed () -> () to @escaping @callee_unowned @convention(block) () > () (<compilergenerated>:0)
32 libdispatch.dylib 0x0000000198ef19a8 _dispatch_call_block_and_release + 20
33 libdispatch.dylib 0x0000000198ef2524 _dispatch_client_callout + 12
34 libdispatch.dylib 0x0000000198e9ae98 _dispatch_continuation_pop$VARIANT$mp + 408
35 libdispatch.dylib 0x0000000198e9a6a8 _dispatch_async_redirect_invoke + 840
36 libdispatch.dylib 0x0000000198ea7438 _dispatch_root_queue_drain + 372
37 libdispatch.dylib 0x0000000198ea7bf8 _dispatch_worker_thread2 + 120
38 libsystem_pthread.dylib 0x0000000198f43b38 _pthread_wqthread + 208
39 libsystem_pthread.dylib 0x0000000198f46740 start_wqthread + 4

Thread 0:
0 libsystem_kernel.dylib 0x0000000199000198 mach_msg_trap + 8
1 CoreFoundation 0x00000001991aa328 __CFRunLoopServiceMachPort + 144
2 CoreFoundation 0x00000001991a535c __CFRunLoopRun + 1156
3 CoreFoundation 0x00000001991a4ba8 CFRunLoopRunSpecific + 420
4 GraphicsServices 0x00000001a331b344 GSEventRunModal + 156
5 UIKitCore 0x000000019d2e03e4 UIApplicationMain + 1928
6 MyApp 0x00000001020d470c main (AppDelegate.swift:39)
7 libdyld.dylib 0x000000019902c8f0 start + 0

Attached crash log

Steps for others to Reproduce

No particular pattern or steps

Code Sample

the last realm API called from app in the stack trace
let rlm = try Realm()

Version of Realm and Tooling

Realm framework version:

pod 'Realm', '5.4.4'
pod 'RealmSwift', '5.4.4'

Realm Object Server version: N/A

Xcode version: Version 11.3.1 (11C504)

iOS/OSX version: iPhone OS 13.7

Dependency manager + version: CocoaPods

[tgoyne]

That crash log does not show a crash inside Realm. The crash is on the main thread, not on the background thread where a Realm is being opened.

[dheeraj-singh511]

@tgoyne - Crash reporting tool Appcenter is pointing to realm thread. I updated ticket with stacktrace

[leemaguire]

@dheeraj-singh511 If you could give us a self contained reproduction case that would be very helpful. Also please update to version 5.4.7 and see if that helps. Thanks

[dheeraj-singh511]

@leemaguire - I analyzed logs when the crash happened but did not seem to find any pattern. I am unable to replicate it. As per the stack trace, it is crashing when app tries to create new realm instance.

Meanwhile, I will upgrade to 5.4.7. I will update you if the crash is still seen.

[leemaguire]

Closing due to inactivity, if the issue persists with the latest version of Realm please open a new issue. Thanks.