realm-swift: EXC_BAD_ACCESS KERN_INVALID_ADDRESS realm::util::EncryptedFileMapping::read_barrier crash!!!

!!! MANDATORY TO FILL OUT !!!

Goals

no source code and configuration change. After update realm 5.0.2, crash occurs many times. Please help!

Expected Results

Actual Results

Crashed: com.apple.root.default-qos 0 Realm 0x10414eef8 realm::util::EncryptedFileMapping::read_barrier(void const_, unsigned long, unsigned long ()(char const*)) + 32 1 Realm 0x103e4eb78 realm::util::do_encryption_read_barrier(void const, unsigned long, unsigned long ()(char const), realm::util::EncryptedFileMapping_) + 8932 2 Realm 0x1040f0490 long long realm::ConstObj::get<long long>(realm::ColKey::Idx) const + 236 3 App 0x102ed7e80 syncError #1 (c⭕done:) in CloudManager.handleError(😃 + 74 (CloudManager.swift:74) 4 App 0x102ed919c doHandleError #1 () in CloudManager.handleError(😃 + 150 (CloudManager.swift:150) 5 App 0x102fce850 thunk for @callee_guaranteed () > (@error @owned Error) + 4301809744 (<compilergenerated>:4301809744) 6 App 0x102ee4820 partial apply for thunk for @callee_guaranteed () > (@error @owned Error) + 4300851232 (<compilergenerated>:4300851232) 7 App 0x102ee6514 thunk for @callee_guaranteed () -> (@error @owned Error)partial apply + 4300858644 8 libswiftObjectiveC.dylib 0x1f35f7bbc autoreleasepool(invoking:) + 56 9 App 0x102ee4f3c partial apply for closure #1 in CloudManager.handleError(😃 + 4300853052 (<compiler-generated>:4300853052) 10 App 0x1031573ec thunk for @escaping @callee_guaranteed () > () + 4303418348 (<compilergenerated>:4303418348) 11 libdispatch.dylib 0x1bcbc69a8 _dispatch_call_block_and_release + 24 12 libdispatch.dylib 0x1bcbc7524 _dispatch_client_callout + 16 13 libdispatch.dylib 0x1bcb6fc60 _dispatch_queue_override_invoke + 952 14 libdispatch.dylib 0x1bcb7c438 _dispatch_root_queue_drain + 376 15 libdispatch.dylib 0x1bcb7cbf8 _dispatch_worker_thread2 + 124 16 libsystem_pthread.dylib 0x1bcc18b38 _pthread_wqthread + 212 17 libsystem_pthread.dylib 0x1bcc1b740 start_wqthread + 8

Steps to Reproduce

crash occurs randomly in only 5.0.x version.

Code Sample

func syncError(c: CloudError, o: Object?, done: (() -> Void)?) { var name: String = “” var pred: NSPredicate? var params = String:Any? var update: Date? var check: Bool = true

        if c.dataType == 0 {  ///===> CRASH!!!!!!!!!
            name = "Entry"
            if let entry = o as? Entry {
                pred = NSPredicate(format: "sid == %@", entry.sid)
                params = entry.toCloudParams()
                update = entry.update
            }
        } else if c.dataType == 1 {
            name = "Day"
            if let day = o as? Day {
                pred = NSPredicate(format: "sid == %@", day.sid)
                params = day.toCloudParams()
                update = day.update
            }
        } else if c.dataType == 2 {
            name = "ColorLabel"
            if let colorLabel = o as? ColorLabel {
                pred = NSPredicate(format: "sid == %@", colorLabel.sid)
                params = colorLabel.toCloudParams()
                update = colorLabel.update
            }
            check = false
        }
        
        let dataKey = c.dataKey
        if let _pred = pred {
            CloudQuery.fetch(self.cloud.privateDB, recordType: name, predicate: _pred, forCheck: check, done: { (ret, err) in
                if err != nil {
                    completeError(err, dataKey: dataKey)
                    done?()
                } else {
                    if let _ret = ret as? [CKRecord], !_ret.isEmpty, let first = _ret.first {
                        if let left = update, let right = first["update"] as? Date, left > right {
                            CloudQuery.update(self.cloud.privateDB, record: first, keyedValues: params, done: { (ret, err) in
                                completeError(err, dataKey: dataKey)
                                done?()
                            })
                        } else {
                            completeError(nil, dataKey: dataKey)
                            done?()
                        }
                    } else {
                        CloudQuery.insert(self.cloud.privateDB, recordType: name, keyedValues: params, done: { (ret, err) in
                            completeError(err, dataKey: dataKey)
                            done?()
                        })
                    }
                }
            })
        } else {
            completeError(nil, dataKey: dataKey)
            done?()
        }
    }
    
    func doHandleError() {
        var deletes = Set<String>()
        if let ces = Fetch.cloudError([:]), !ces.isEmpty {
            for c in ces {
                if c.syncOp == 100 || c.tryCount >= self.maxCloudTryCount {
                    deletes.insert(c.dataKey)
                } else {
                    var o: Object?
                    if c.dataType == 0 {    //entry
                        o = Fetch.entry(["sid":c.dataKey], all: true)?.first
                    } else if c.dataType == 1 {     //day
                        o = Fetch.day(["sid":c.dataKey], all: true)?.first
                    }
                    todos.append((c, o))
                }
            }
        }
        
        for t in todos {
            let group = DispatchGroup()
            group.enter()
            syncError(c: t.0, o: t.1) {
                group.leave()
            }
            group.wait()
        }
        
        for d in deletes {
            if let c = Fetch.cloudError(["dataKey":d])?.first {
                Delete.cloudError(c)
            }
        }
    }
    
    let group = DispatchGroup()
    let queue = DispatchQueue.global()
    queue.async(group: group) {
        autoreleasepool {
            doHandleError()
        }
    }
    group.notify(queue: queue) {
        done?()
    }

Version of Realm and Tooling

5.0.2

Realm framework version: ? 5.0.2

Realm Object Server version: ?

Xcode version: ? 11.5

iOS/OSX version: ? 13.4

Dependency manager + version: ?