realm-swift
realm-swift copied to clipboard
Published
20 hours ago •
realm
realm
Crash when access Realm on background
How frequently does the bug occur?
Sometimes
Description
I face the same problem here in my app, but set protection attribute to .none does not solve the issue. Here the code sample:
let folderPath = config.fileURL!.deletingLastPathComponent().path
do {
let attributes = try FileManager.default.attributesOfItem(atPath: folderPath)
let protectionType = attributes[.protectionKey] as? FileProtectionType
if protectionType != .some(FileProtectionType.none) {
try FileManager.default.setAttributes([.protectionKey: FileProtectionType.none], ofItemAtPath: folderPath)
}
} catch {
log("Unable to set protection attributes for realm folder: \(error)")
}`
below the crash reported only in crashlytics on live app
Can someone help?
Stacktrace & log output
0 Realm 0x198d10 realm::DB::grab_read_lock(realm::DB::ReadLockInfo&, realm::VersionID) + 424
1 Realm 0x193be8 realm::DB::start_read(realm::VersionID) + 200
2 Realm 0x44dae4 realm::Realm::begin_read(realm::VersionID) + 44
3 Realm 0x44da04 realm::Realm::transaction() + 112
4 Realm 0x646a0 realm::Object realm::Object::get_for_primary_key<objc_object* __strong, RLMAccessorContext>(RLMAccessorContext&, std::__1::shared_ptr<realm::Realm> const&, realm::ObjectSchema const&, objc_object* __strong) + 148
5 Realm 0x64484 RLMGetObject + 280
6 RealmSwift 0x6ec14 $s10RealmSwift0A0V6object6ofType13forPrimaryKeyxSgxm_q_tSo0aB6ObjectCRbzr0_lF + 240
Can you reproduce the bug?
Not yet
Reproduction Steps
No response
Version
10.28.0
What SDK flavour are you using?
Local Database only
Are you using encryption?
Yes, using encryption
Platform OS and version(s)
iOS 15.4.1 ~ 15.6.1 - multiple iPhone
Build environment
Xcode version: .Xcode 13.3
Hi @mmar001 Are you using AppGroups? Could you paste the entire stack trace to help us to investigate further?
I had a look at your other issue.
let db = try Realm(configuration: appConf)
fixRealmBackgroundCrash(config: appConf)
setting the file protection attributes must come before opening the database. Can you change it to
fixRealmBackgroundCrash(config: appConf)
let db = try Realm(configuration: appConf)
We don't use AppGroups
Crashed: com.apple.main-thread
0 Realm 0x198d10 realm::DB::grab_read_lock(realm::DB::ReadLockInfo&, realm::VersionID) + 424
1 Realm 0x193be8 realm::DB::start_read(realm::VersionID) + 200
2 Realm 0x44dae4 realm::Realm::begin_read(realm::VersionID) + 44
3 Realm 0x44da04 realm::Realm::transaction() + 112
4 Realm 0x646a0 realm::Object realm::Object::get_for_primary_key<objc_object* __strong, RLMAccessorContext>(RLMAccessorContext&, std::__1::shared_ptr<realm::Realm> const&, realm::ObjectSchema const&, objc_object* __strong) + 148
5 Realm 0x64484 RLMGetObject + 280
6 RealmSwift 0x6ec14 $s10RealmSwift0A0V6object6ofType13forPrimaryKeyxSgxm_q_tSo0aB6ObjectCRbzr0_lF + 240
7 App 0x8b5d28 getFromDb<A>(withPrimaryKey:) + 296 (DatabaseManager.swift:296)
…
11 RxSwift 0x531f8 $s7RxSwift14ObservableTypePAAE9subscribe6onNext0F5Error0F9Completed0F8DisposedAA10Disposable_py7ElementQzcSg_ys0H0_pcSgyycSgAOtFyAA5EventOyAKGcfU_ + 272
12 RxSwift 0x53574 $s7RxSwift14ObservableTypePAAE9subscribe6onNext0F5Error0F9Completed0F8DisposedAA10Disposable_py7ElementQzcSg_ys0H0_pcSgyycSgAOtFyAA5EventOyAKGcfU_TA + 48
13 RxSwift 0x73dc $s7RxSwift17AnonymousObserverC6onCoreyyAA5EventOyxGF + 20
14 RxSwift 0x5595c $s7RxSwift12ObserverBaseC2onyyAA5EventOyxGF + 276
15 RxSwift 0x55aa0 $s7RxSwift12ObserverBaseCyxGAA0C4TypeA2aEP2onyyAA5EventOy7ElementQzGFTW + 20
16 RxSwift 0x54d28 $s7RxSwift32ObserveOnSerialDispatchQueueSink33_277A93ABA8477198C125F3F26B2D4B62LLC9scheduler8observer6cancelADyxGAA0efG9SchedulerC_xAA10Cancelable_ptcfcAA10Disposable_pAH4sink_AA5EventOy7ElementQzG5eventt_tcfU_ + 556
17 RxSwift 0x556a4 $s7RxSwift32ObserveOnSerialDispatchQueueSink33_277A93ABA8477198C125F3F26B2D4B62LLCyxGAA5EventOy7ElementAA12ObserverTypePQzGAA10Disposable_pIeggnr_AE_ALtAaM_pIegnr_AaIRzlTRTA + 148
18 RxSwift 0x46d0c $s7RxSwift13MainSchedulerC16scheduleInternal_6actionAA10Disposable_px_AaF_pxctlFyycfU_ + 116
19 RxSwift 0x2b0d0 $sIeg_IeyB_TR + 28
20 libdispatch.dylib 0x1e6c _dispatch_call_block_and_release + 32
21 libdispatch.dylib 0x3a30 _dispatch_client_callout + 20
22 libdispatch.dylib 0x11f48 _dispatch_main_queue_drain + 928
23 libdispatch.dylib 0x11b98 _dispatch_main_queue_callback_4CF + 44
24 CoreFoundation 0x51800 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 16
25 CoreFoundation 0xb704 __CFRunLoopRun + 2532
26 CoreFoundation 0x1ebc8 CFRunLoopRunSpecific + 600
27 GraphicsServices 0x1374 GSEventRunModal + 164
28 UIKitCore 0x514648 -[UIApplication _run] + 1100
29 UIKitCore 0x295d90 UIApplicationMain + 364
…
31 ??? 0x1034d9ce4 (Missing)
com.apple.uikit.eventfetch-thread
0 libsystem_kernel.dylib 0x14a0 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x1ae4 mach_msg + 76
2 CoreFoundation 0x6d30 __CFRunLoopServiceMachPort + 372
3 CoreFoundation 0xb1bc __CFRunLoopRun + 1180
4 CoreFoundation 0x1ebc8 CFRunLoopRunSpecific + 600
5 Foundation 0x19464 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 236
6 Foundation 0x5ae2c -[NSRunLoop(NSRunLoop) runUntilDate:] + 92
7 UIKitCore 0x48e770 -[UIEventFetcher threadMain] + 524
8 Foundation 0x6943c __NSThread__start__ + 808
9 libsystem_pthread.dylib 0x19ac _pthread_start + 148
10 libsystem_pthread.dylib 0xe68 thread_start + 8
com.google.firebase.crashlytics.MachExceptionServer
0 FirebaseCrashlytics 0x1cf2c FIRCLSProcessRecordAllThreads + 184
1 FirebaseCrashlytics 0x1d30c FIRCLSProcessRecordAllThreads + 1176
2 FirebaseCrashlytics 0x1617c FIRCLSHandler + 48
3 FirebaseCrashlytics 0x18f44 FIRCLSMachExceptionServer + 1236
4 libsystem_pthread.dylib 0x19ac _pthread_start + 148
5 libsystem_pthread.dylib 0xe68 thread_start + 8
com.apple.NSURLConnectionLoader
0 libsystem_kernel.dylib 0x14a0 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x1ae4 mach_msg + 76
2 CoreFoundation 0x6d30 __CFRunLoopServiceMachPort + 372
3 CoreFoundation 0xb1bc __CFRunLoopRun + 1180
4 CoreFoundation 0x1ebc8 CFRunLoopRunSpecific + 600
5 CFNetwork 0x27823c _CFURLStorageSessionDisableCache + 60032
6 Foundation 0x6943c __NSThread__start__ + 808
7 libsystem_pthread.dylib 0x19ac _pthread_start + 148
8 libsystem_pthread.dylib 0xe68 thread_start + 8
queue.devices
0 libsystem_kernel.dylib 0x4ba4 poll + 8
…
16 libdispatch.dylib 0x1e6c _dispatch_call_block_and_release + 32
17 libdispatch.dylib 0x3a30 _dispatch_client_callout + 20
18 libdispatch.dylib 0xb124 _dispatch_lane_serial_drain + 668
19 libdispatch.dylib 0xbc80 _dispatch_lane_invoke + 392
20 libdispatch.dylib 0x16500 _dispatch_workloop_worker_thread + 648
21 libsystem_pthread.dylib 0x10bc _pthread_wqthread + 288
22 libsystem_pthread.dylib 0xe5c start_wqthread + 8
queue.wifiDet
0 libsystem_kernel.dylib 0x4ba4 poll + 8
…
16 libdispatch.dylib 0x1e6c _dispatch_call_block_and_release + 32
17 libdispatch.dylib 0x3a30 _dispatch_client_callout + 20
18 libdispatch.dylib 0xb124 _dispatch_lane_serial_drain + 668
19 libdispatch.dylib 0xbc80 _dispatch_lane_invoke + 392
20 libdispatch.dylib 0x16500 _dispatch_workloop_worker_thread + 648
21 libsystem_pthread.dylib 0x10bc _pthread_wqthread + 288
22 libsystem_pthread.dylib 0xe5c start_wqthread + 8
queue.NetworkSummary
0 libsystem_kernel.dylib 0x242c read + 8
…
27 libdispatch.dylib 0x1e6c _dispatch_call_block_and_release + 32
28 libdispatch.dylib 0x3a30 _dispatch_client_callout + 20
29 libdispatch.dylib 0xb124 _dispatch_lane_serial_drain + 668
30 libdispatch.dylib 0xbc80 _dispatch_lane_invoke + 392
31 libdispatch.dylib 0x16500 _dispatch_workloop_worker_thread + 648
32 libsystem_pthread.dylib 0x10bc _pthread_wqthread + 288
33 libsystem_pthread.dylib 0xe5c start_wqthread + 8
Realm notification listener
0 libsystem_kernel.dylib 0x2e18 kevent + 8
1 Realm 0x3aaf04 realm::_impl::ExternalCommitHelper::listen() + 156
2 Realm 0x3ab054 void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, realm::_impl::ExternalCommitHelper::ExternalCommitHelper(realm::_impl::RealmCoordinator&)::$_0> >(void*) + 52
3 libsystem_pthread.dylib 0x19ac _pthread_start + 148
4 libsystem_pthread.dylib 0xe68 thread_start + 8
queue.DMASuperWifiProvider
0 libsystem_kernel.dylib 0x2600 __psynch_mutexwait + 8
1 libsystem_pthread.dylib 0x23dc _pthread_mutex_firstfit_lock_wait + 84
2 libsystem_pthread.dylib 0x952c _pthread_mutex_firstfit_lock_slow + 248
3 libc++.1.dylib 0xf344 std::__1::recursive_mutex::lock() + 16
4 Realm 0x198ba0 realm::DB::grab_read_lock(realm::DB::ReadLockInfo&, realm::VersionID) + 56
5 Realm 0x193be8 realm::DB::start_read(realm::VersionID) + 200
6 Realm 0x44dae4 realm::Realm::begin_read(realm::VersionID) + 44
7 Realm 0x44da04 realm::Realm::transaction() + 112
8 Realm 0x646a0 realm::Object realm::Object::get_for_primary_key<objc_object* __strong, RLMAccessorContext>(RLMAccessorContext&, std::__1::shared_ptr<realm::Realm> const&, realm::ObjectSchema const&, objc_object* __strong) + 148
9 Realm 0x64484 RLMGetObject + 280
10 RealmSwift 0x6ec14 $s10RealmSwift0A0V6object6ofType13forPrimaryKeyxSgxm_q_tSo0aB6ObjectCRbzr0_lF + 240
…
15 RxSwift 0x2b8e8 $s7RxSwift19AnonymousObservable33_95EBF5692819D58425EC2DD0512D115ALLC3run_6cancelAA10Disposable_p4sink_AaG_p12subscriptiontqd___AA10Cancelable_pt7ElementQyd__RszAA12ObserverTypeRd__lF + 240
16 RxSwift 0x5d264 $s7RxSwift8ProducerC9subscribeyAA10Disposable_pqd__7ElementQyd__RszAA12ObserverTypeRd__lFAaE_pyt_tcfU_ + 228
17 RxSwift 0x5c950 $s7RxSwift22CurrentThreadSchedulerC8schedule_6actionAA10Disposable_px_AaF_pxctlFyt_Tg5 + 168
18 RxSwift 0x5c850 $s7RxSwift8ProducerC9subscribeyAA10Disposable_pqd__7ElementQyd__RszAA12ObserverTypeRd__lF + 496
19 RxSwift 0x50b2c $s7RxSwift10ObservableCyxGAA0C4TypeA2aEP9subscribeyAA10Disposable_pqd__AA08ObserverD0Rd__7ElementQyd__AJRtzlFTW + 28
20 RxSwift 0x77828 $s7RxSwift15SubscribeOnSink33_B44C3DD7F62EF81799E6347E59A266A2LLC3runAA10Disposable_pyFAaF_pyt_tcfU_ + 152
21 RxSwift 0x35ccc $s7RxSwift26DispatchQueueConfigurationV8schedule_6actionAA10Disposable_px_AaF_pxctlFyycfU_TA + 120
22 RxSwift 0x2b0d0 $sIeg_IeyB_TR + 28
23 libdispatch.dylib 0x1e6c _dispatch_call_block_and_release + 32
24 libdispatch.dylib 0x3a30 _dispatch_client_callout + 20
25 libdispatch.dylib 0xb124 _dispatch_lane_serial_drain + 668
26 libdispatch.dylib 0xbcb4 _dispatch_lane_invoke + 444
27 libdispatch.dylib 0xb000 _dispatch_lane_serial_drain + 376
28 libdispatch.dylib 0xbc80 _dispatch_lane_invoke + 392
29 libdispatch.dylib 0x16500 _dispatch_workloop_worker_thread + 648
30 libsystem_pthread.dylib 0x10bc _pthread_wqthread + 288
31 libsystem_pthread.dylib 0xe5c start_wqthread + 8
queue.discovery
0 libsystem_kernel.dylib 0x4ba4 poll + 8
…
16 libswiftDispatch.dylib 0x2598 partial apply for thunk for @callee_guaranteed () -> (@out A, @error @owned Error) + 28
17 libswiftDispatch.dylib 0x9af8 thunk for @callee_guaranteed () -> (@out A, @error @owned Error)partial apply + 16
18 libswiftDispatch.dylib 0x3958 closure #1 in closure #1 in OS_dispatch_queue._syncHelper<A>(fn:execute:rescue:) + 188
19 libswiftDispatch.dylib 0x3a6c partial apply for thunk for @callee_guaranteed () -> () + 28
20 libswiftDispatch.dylib 0x3384 thunk for @escaping @callee_guaranteed () -> () + 28
21 libdispatch.dylib 0x3a30 _dispatch_client_callout + 20
22 libdispatch.dylib 0x12c90 _dispatch_lane_barrier_sync_invoke_and_complete + 56
23 libswiftDispatch.dylib 0x2cac implicit closure #2 in implicit closure #1 in OS_dispatch_queue.sync<A>(execute:) + 180
24 libswiftDispatch.dylib 0x1d0c partial apply for implicit closure #2 in implicit closure #1 in OS_dispatch_queue.sync<A>(execute:) + 56
25 libswiftDispatch.dylib 0x29ec OS_dispatch_queue._syncHelper<A>(fn:execute:rescue:) + 396
26 libswiftDispatch.dylib 0x1dbc OS_dispatch_queue.sync<A>(execute:) + 168
…
30 libdispatch.dylib 0x1e6c _dispatch_call_block_and_release + 32
31 libdispatch.dylib 0x3a30 _dispatch_client_callout + 20
32 libdispatch.dylib 0xb124 _dispatch_lane_serial_drain + 668
33 libdispatch.dylib 0xbc80 _dispatch_lane_invoke + 392
34 libdispatch.dylib 0x16500 _dispatch_workloop_worker_thread + 648
35 libsystem_pthread.dylib 0x10bc _pthread_wqthread + 288
36 libsystem_pthread.dylib 0xe5c start_wqthread + 8
Thread
0 libsystem_kernel.dylib 0x1a74 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x1108 _pthread_wqthread + 364
2 libsystem_pthread.dylib 0xe5c start_wqthread + 8
Thread
0 libsystem_kernel.dylib 0x1a74 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x1108 _pthread_wqthread + 364
2 libsystem_pthread.dylib 0xe5c start_wqthread + 8
Thread
0 libsystem_kernel.dylib 0x1a74 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x1108 _pthread_wqthread + 364
2 libsystem_pthread.dylib 0xe5c start_wqthread + 8
Thread
0 libsystem_kernel.dylib 0x1a74 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x1108 _pthread_wqthread + 364
2 libsystem_pthread.dylib 0xe5c start_wqthread + 8
This doesn't look related to file locking, but something else has the read lock on the database. Do you have realm running in multiple threads? Is this only happening when the app is in the background?
If its happening in the background only, you probably need to extend the background execution time. https://developer.apple.com/documentation/uikit/app_and_environment/scenes/preparing_your_ui_to_run_in_the_background/extending_your_app_s_background_execution_time
Yes it only happens in background, then I'll try to extend the background execution time. And yes we use Realm in multiple thread.
Hi @mmar001 did the change to the execution time fixed the issue?, please let us know if the problem continues or nor
