objectbox
App Crashes while ObjectBox Database sharing between main app and its extension
(https://stackoverflow.com/posts/71414769/timeline)
I was trying to share the Objectbox created database between the app and its extension. I used the below code to share the database between the app and its extension.
static func storeURL() -> URL {
guard let fileContainer = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: "AppGroupName") else {
fatalError("Shared file container could not be created.")
}
return fileContainer.appendingPathComponent("\(databaseName)")
}
The app is working fine when the app is running in foreground. When the app goes to the background then the app is crashing. When I remove the above code and used the below code
let appSupport = try FileManager.default.url(for: .documentDirectory,
in: .userDomainMask,
appropriateFor: nil,
create: true)
.appendingPathComponent(Bundle.main.bundleIdentifier!)
let directory = appSupport.appendingPathComponent(databaseName)
The app does not crash and started working fine without Database sharing.
Note: If we ignore this crash, I was able to use the database from the app and its extension. We can not ignore it because it happens every-time.
Basic Infor Object Box : 1.5.0 iOS: iOS 15 and above Device: Any iPhone not simulator
Step to Reproduce
- Add database sharing code into your project.
- Run the app on real device.
- Put the app into the background.
- App crashed with Message from debugger: Terminated due to signal 9 Crashlog.pdf
Log
Incident Identifier: 98C56047-74B1-451A-9C3B-43A692895A71
CrashReporter Key: 072d5704b215a896d22637c9624964d0a2c21945
Hardware Model: iPhone12,1
Process: ContentApp [2126]
Path: /private/var/containers/Bundle/Application/47344E9B-4903-4BEA-B37C-B6BB3A1EDB45/ContentApp.app/ContentApp
Identifier: com.alfresco.contentapp
Version: 1.2.0-M1 (2)
Code Type: ARM-64 (Native)
Role: unknown
Parent Process: launchd [1]
Coalition: com.alfresco.contentapp [1024]
Date/Time: 2022-04-08 13:31:49.0834 +0530
Launch Time: 2022-04-08 13:31:17.0746 +0530
OS Version: iPhone OS 15.3.1 (19D52)
Release Type: User
Baseband Version: 3.01.02
Report Version: 104
Exception Type: EXC_CRASH (SIGKILL)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Termination Reason: RUNNINGBOARD; [3735883980]
Triggered by Thread: 0
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 libsystem_kernel.dylib 0x1b7b93504 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x1b7b93b9c mach_msg + 76
2 CoreFoundation 0x1805a7738 __CFRunLoopServiceMachPort + 372
3 CoreFoundation 0x1805aba2c __CFRunLoopRun + 1212
4 CoreFoundation 0x1805bf468 CFRunLoopRunSpecific + 600
5 GraphicsServices 0x19c16338c GSEventRunModal + 164
6 UIKitCore 0x182f625d0 -[UIApplication _run] + 1100
7 UIKitCore 0x182ce0f74 UIApplicationMain + 364
8 ContentApp 0x1028d6b10 main + 64
9 dyld 0x103729aa4 start + 520
Thread 1:
0 libsystem_pthread.dylib 0x1f10cae8c start_wqthread + 0
Thread 2:
0 libsystem_pthread.dylib 0x1f10cae8c start_wqthread + 0
Thread 3 name: com.apple.uikit.eventfetch-thread
Thread 3:
0 libsystem_kernel.dylib 0x1b7b93504 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x1b7b93b9c mach_msg + 76
2 CoreFoundation 0x1805a7738 __CFRunLoopServiceMachPort + 372
3 CoreFoundation 0x1805aba2c __CFRunLoopRun + 1212
4 CoreFoundation 0x1805bf468 CFRunLoopRunSpecific + 600
5 Foundation 0x181dddc84 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 236
6 Foundation 0x181e1edb8 -[NSRunLoop(NSRunLoop) runUntilDate:] + 92
7 UIKitCore 0x182edb74c -[UIEventFetcher threadMain] + 524
8 Foundation 0x181e2d3fc __NSThread__start__ + 808
9 libsystem_pthread.dylib 0x1f10cb9a4 _pthread_start + 148
10 libsystem_pthread.dylib 0x1f10caea0 thread_start + 8
Thread 4 name: com.google.firebase.crashlytics.MachExceptionServer
Thread 4:
0 libsystem_kernel.dylib 0x1b7b93504 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x1b7b93b9c mach_msg + 76
2 FirebaseCrashlytics 0x103c82a6c FIRCLSMachExceptionReadMessage + 80
3 FirebaseCrashlytics 0x103c829ac FIRCLSMachExceptionServer + 48
4 libsystem_pthread.dylib 0x1f10cb9a4 _pthread_start + 148
5 libsystem_pthread.dylib 0x1f10caea0 thread_start + 8
Thread 5 name: com.apple.NSURLConnectionLoader
Thread 5:
0 libsystem_kernel.dylib 0x1b7b93504 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x1b7b93b9c mach_msg + 76
2 CoreFoundation 0x1805a7738 __CFRunLoopServiceMachPort + 372
3 CoreFoundation 0x1805aba2c __CFRunLoopRun + 1212
4 CoreFoundation 0x1805bf468 CFRunLoopRunSpecific + 600
5 CFNetwork 0x181035510 0x180dbb000 + 2598160
6 Foundation 0x181e2d3fc __NSThread__start__ + 808
7 libsystem_pthread.dylib 0x1f10cb9a4 _pthread_start + 148
8 libsystem_pthread.dylib 0x1f10caea0 thread_start + 8
Thread 6:
0 libsystem_pthread.dylib 0x1f10cae8c start_wqthread + 0
Thread 7:
0 libsystem_pthread.dylib 0x1f10cae8c start_wqthread + 0
Thread 0 crashed with ARM Thread State (64-bit):
x0: 0x0000000010004005 x1: 0x0000000007000806 x2: 0x0000000000000000 x3: 0x0000000000000c00
x4: 0x0000000000000e03 x5: 0x00000000ffffffff x6: 0x0000000000000000 x7: 0x00000002810e41a0
x8: 0x00000000fffffbbf x9: 0x0000000007000906 x10: 0x1b2bfbd61fb100d4 x11: 0x000000b2f529e48a
x12: 0x00000000016e3600 x13: 0x000000000086833a x14: 0x0000000000000001 x15: 0x0000010000000102
x16: 0xffffffffffffffe1 x17: 0x0000000000000100 x18: 0x000000014653b940 x19: 0x0000000000000000
x20: 0x00000000ffffffff x21: 0x0000000000000e03 x22: 0x0000000000000c00 x23: 0x000000016d646ad0
x24: 0x0000000007000806 x25: 0x0000000000000000 x26: 0x0000000007000806 x27: 0x0000000000000e03
x28: 0x0000000000000e03 fp: 0x000000016d646950 lr: 0x00000001b7b93b9c
sp: 0x000000016d646900 pc: 0x00000001b7b93504 cpsr: 0x60000000
far: 0x0000000111837800 esr: 0x56000080 Address size fault
Binary Images:
0x1b7b92000 - 0x1b7bc5fff libsystem_kernel.dylib arm64e <ff3ee512a0bc3123b983d365a71fb06a> /usr/lib/system/libsystem_kernel.dylib
0x1805a0000 - 0x1809f3fff CoreFoundation arm64e <e2f84645290531ef8ec73cc19c3cddb3> /System/Library/Frameworks/CoreFoundation.framework/CoreFoundation
0x19c162000 - 0x19c16afff GraphicsServices arm64e <b40e3b1790c73ebcb6bc8c7b605f47a9> /System/Library/PrivateFrameworks/GraphicsServices.framework/GraphicsServices
0x182a49000 - 0x1842d4fff UIKitCore arm64e <920a0ee6d2663058814427a27b23ad62> /System/Library/PrivateFrameworks/UIKitCore.framework/UIKitCore
0x1027b8000 - 0x102bbffff ContentApp arm64 <2c330856c5e63c468bea0c0fb63cea11> /private/var/containers/Bundle/Application/47344E9B-4903-4BEA-B37C-B6BB3A1EDB45/ContentApp.app/ContentApp
0x103710000 - 0x103767fff dyld arm64e <780553c7d39f322a8cb9f4f6de52610d> /usr/lib/dyld
0x1f10ca000 - 0x1f10d5fff libsystem_pthread.dylib arm64e <a17d07cfe86a392387c4921045898a8a> /usr/lib/system/libsystem_pthread.dylib
0x181dc5000 - 0x1820cbfff Foundation arm64e <925a43cdeaf2316193783ed87468301d> /System/Library/Frameworks/Foundation.framework/Foundation
0x103c60000 - 0x103caffff FirebaseCrashlytics arm64 <ef0322c05d0d3ddbbba31b59b1831eec> /private/var/containers/Bundle/Application/47344E9B-4903-4BEA-B37C-B6BB3A1EDB45/ContentApp.app/Frameworks/FirebaseCrashlytics.framework/FirebaseCrashlytics
0x180dbb000 - 0x18127ffff CFNetwork arm64e <23a465f1e97c36c5a30fcefec059f79f> /System/Library/Frameworks/CFNetwork.framework/CFNetwork
EOF
Could you try the following (pseudo code) to open the store:
if Store.isOpen(directory) {
store = Store.attachTo(directory)
else {
store = Store(directory: directory)
}
If the app goes into background, it also may help to close the store.
Hi @greenrobot, Thanks for your response, We tried your solution as below.
init() {
do {
let directory = URL.storeURL()
if (try Store.isOpen(directory: directory.path)) == true {
self.store = try Store.attachTo(directory: directory.path)
} else {
self.store = try Store(directoryPath: directory.path)
}
} catch let error {
print("Unable to initialize persistence store: \(error)")
}
}
We are still getting crashes while going into the background. for reference: Shared app group directory path(/private/var/mobile/Containers/Shared/AppGroup/B2974F9C-4189-4597-8098-98A5171FC0FD/MobileAppDB)
Hi Guys Any update on this? I am also getting the same issue.
Could you try the following (pseudo-code) to open the store:
if Store.isOpen(directory) { store = Store.attachTo(directory) else { store = Store(directory: directory) }If the app goes into the background, it also may help to close the store.
Any update on it? We got the same kind of crash on iOS 15 for realm for other applications. They fixed something. I tried to figure it out. I didn't get anything.
@nisha-rana16 Is this still an issue with the latest version (1.9.2)? I'm not familiar with app extensions, but upon reading extensions like widgets seem to run in a different process? If the app goes to the background, this might probably cause the database to close? Then it can not longer be accessed from the extension process? So maybe handling that case might avoid crashes? (Though, it's generally a bad idea to access the same database files from different processes.)
As for a workaround: is it possible to just pass data to the extension from the app and the extension does not touch the database itself at all?
