Index out of bounds.

[igrechuhin]

!!! MANDATORY TO FILL OUT !!!

Goals

No out of bounds.

Expected Results

No out of bounds.

Actual Results

Undefined behavior.

Steps for others to Reproduce

Code Sample

private var realm: Realm {
        let configuration = Realm.Configuration(
            fileURL: URL(
                fileURLWithPath: Resource.dataPath(basePath: Resource.dataFolder, forName: "default", ofType: "realm"),
                isDirectory: false
            ),
            deleteRealmIfMigrationNeeded: true,
            shouldCompactOnLaunch: { fileSize, dataSize in
                dataSize * 2 < fileSize
            }
        )
        do {
            return try Realm(configuration: configuration)
        } catch {
            fatalError(error.localizedDescription)
        }
    }

func objects<Element>(_ type: Element.Type, sortByDate: Bool = true) -> Results<Element> where Element: Object {
        if sortByDate {
            return realm.objects(type).sorted(byKeyPath: "date")
        }
        return realm.objects(type)
    }

Error 1

/SourcePackages/checkouts/realm-core/src/realm/db.cpp: runtime: Undefined Behavior: Index 231 out of bounds for type '(anonymous namespace)::Ringbuffer::ReadCount [32]'

Out of bounds index
#0 0x00000001026a79bc in (anonymous namespace)::Ringbuffer::get_next() ()
#1 0x00000001026a4577 in realm::DB::low_level_commit(unsigned long long, realm::Transaction&) at xxx/SourcePackages/checkouts/realm-core/src/realm/db.cpp:2287
#2 0x00000001026a303a in realm::DB::do_commit(realm::Transaction&) at xxx/SourcePackages/checkouts/realm-core/src/realm/db.cpp:2086
#3 0x000000010269e4c2 in realm::Transaction::commit() at xxx/SourcePackages/checkouts/realm-core/src/realm/db.cpp:2507
#4 0x00000001012c1668 in realm::_impl::RealmCoordinator::open_db() at xxx/SourcePackages/checkouts/realm-core/src/realm/object-store/impl/realm_coordinator.cpp:520
#5 0x00000001012be179 in realm::_impl::RealmCoordinator::do_get_realm(realm::Realm::Config, std::__1::shared_ptrrealm::Realm&, realm::util::Optionalrealm::VersionID, realm::util::CheckedUniqueLock&) at xxx/SourcePackages/checkouts/realm-core/src/realm/object-store/impl/realm_coordinator.cpp:316
#6 0x00000001012bdc88 in realm::impl::RealmCoordinator::get_realm(realm::Realm::Config, realm::util::Optionalrealm::VersionID) at xxx/SourcePackages/checkouts/realm-core/src/realm/object-store/impl/realm_coordinator.cpp:288
#7 0x00000001018ebb7d in realm::Realm::get_shared_realm(realm::Realm::Config) at xxx/SourcePackages/checkouts/realm-core/src/realm/object-store/shared_realm.cpp:129
#8 0x0000000100d052a0 in +[RLMRealm realmWithConfiguration:queue:error:] at xxx/SourcePackages/checkouts/realm-cocoa/Realm/RLMRealm.mm:440
#9 0x0000000100f82141 in @nonobjc RLMRealm.__allocating_init(configuration:queue:) ()
#10 0x000000010102775d in Realm.init(configuration:queue:) at xxx/SourcePackages/checkouts/realm-cocoa/RealmSwift/Realm.swift:92
#11 0x00000001003453b2 in DB.realm.getter at xxx/DB.swift:21
#12 0x00000001003480e6 in DB.objects(:sortByDate:) at xxx/DB.swift:91

Error 2

/SourcePackages/checkouts/realm-core/src/realm/db.cpp: runtime: Undefined Behavior: Index 57 out of bounds for type '(anonymous namespace)::Ringbuffer::ReadCount const[32]'

Out of bounds index
#0 0x000000010269af93 in (anonymous namespace)::Ringbuffer::get(unsigned int) const ()
#1 0x000000010269f884 in realm::DB::grab_read_lock(realm::DB::ReadLockInfo&, realm::VersionID) at xxx/SourcePackages/checkouts/realm-core/src/realm/db.cpp:1901
#2 0x00000001026964cd in realm::DB::start_read(realm::VersionID) at xxx/SourcePackages/checkouts/realm-core/src/realm/db.cpp:2359
#3 0x00000001012c9694 in realm::impl::RealmCoordinator::begin_read(realm::VersionID, bool) at xxx/SourcePackages/checkouts/realm-core/src/realm/object-store/impl/realm_coordinator.cpp:538
#4 0x00000001018ea724 in realm::Realm::begin_read(realm::VersionID) at xxx/SourcePackages/checkouts/realm-core/src/realm/object-store/shared_realm.cpp:121
#5 0x00000001018ea24d in realm::Realm::read_group() at xxx/SourcePackages/checkouts/realm-core/src/realm/object-store/shared_realm.cpp:81
#6 0x0000000100cff823 in [RLMRealm group] at xxx/SourcePackages/checkouts/realmcocoa/Realm/RLMRealm.mm:180
#7 0x000000010064eaa8 in RLMClassInfo::table() const at xxx/SourcePackages/checkouts/realm-cocoa/Realm/RLMClassInfo.mm:42
#8 0x00000001008b10ee in RLMGetObjects at xxx/SourcePackages/checkouts/realm-cocoa/Realm/RLMObjectStore.mm:195
#9 0x000000010102ce3f in Realm.objects(:) at xxx/SourcePackages/checkouts/realm-cocoa/RealmSwift/Realm.swift:646
#10 0x00000001003480fd in DB.objects(_:sortByDate:) at xxx/DB.swift:91

Version of Realm and Tooling

Realm framework version: 10.7.2 / 10.5.5

Realm Object Server version: ?

Xcode version: 12.4

iOS/OSX version: OSX 11.2.3

Dependency manager + version: SPM

[dianaafanador3]

Hi @igrechuhin, thanks for taking the time to report this issue. Have you been able to solve this?

[dianaafanador3]

Closing this because there is no answer from the user