Bringing app to foreground crash

[paulotaylor]

I'm wondering if you had this issue before, maybe I'm doing something wrong. It crashes when bringing up the app to foreground after being in the background for a while and setting handleBackgroundTransitions = true

Crashed: com.apple.main-thread
EXC_BAD_ACCESS KERN_INVALID_ADDRESS 0x0000000121bec008
Crashed: com.apple.main-thread
0 libswiftCore.dylib 0x192f1162c swift_release + 44
1 libswiftCore.dylib 0x192bac8a8 Array.makeUniqueAndReserveCapacityIfNotUnique() + 212
2 libswiftCore.dylib 0x192bacac8 Array.append(:) + 40
3 MyApp 0x100cd8984 SwiftyPing.informObserver(of:) + 435 (SwiftyPing.swift:435)
4 MyApp 0x100cdaa1c SwiftyPing.socket(socket:didReadData:) + 571 (SwiftyPing.swift:571)
5 MyApp 0x100cd6558 closure #1 in closure #1 in SwiftyPing.createSocket() + 281 (SwiftyPing.swift:281)
6 MyApp 0x100cd660c @objc closure #1 in closure #1 in SwiftyPing.createSocket() + 84 (:84)
7 CoreFoundation 0x18efb78dc __CFSocketPerformV0 + 812
8 CoreFoundation 0x18efac9e8 CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 28
9 CoreFoundation 0x18efac8e4 __CFRunLoopDoSource0 + 208
10 CoreFoundation 0x18efabbe8 __CFRunLoopDoSources0 + 268
11 CoreFoundation 0x18efa5bc8 __CFRunLoopRun + 820
12 CoreFoundation 0x18efa5360 CFRunLoopRunSpecific + 600
13 GraphicsServices 0x1a65e3734 GSEventRunModal + 164
14 UIKitCore 0x191a20584 -[UIApplication _run] + 1072
15 UIKitCore 0x191a25df4 UIApplicationMain + 168
16 MyApp 0x100c7b7ec main + 34 (AppDelegate.swift:34)
17 libdyld.dylib 0x18ec61cf8 start + 4

[mumuWorld]

I have the same problem but not in main-thread. It occurs above iOS 15.0, last func Stack maybe in
private func informObserver(of response: PingResponse) {

Thread 13 Crashed:
0 libsystem_platform.dylib 0x00000001f0d5cab0 platform_memmove
1 MyApp 0x00000001055708c8 $sSa16_createNewBuffer14bufferIsUnique15minimumCapacity13growForAppendySb_SiSbtF5YDASR12PingResponseV_Tg5 + [ : 0]
2 MyApp 0x0000000105568db8 $s5YDASR10SwiftyPingC14informObserver33_5A2F9010047290E81DA28B78E947473ALL2ofyAA0C8ResponseV_tF + [ : 0]
3 MyApp 0x00000001055685a8 $s5YDASR10SwiftyPingC04sendC033_5A2F9010047290E81DA28B78E947473ALLyyFyycfU
4 MyApp 0x0000000104e0e524 $sIeg_IeyB_TR + [ : 0]
5 libdispatch.dylib 0x0000000180598c04 _dispatch_call_block_and_release
6 libdispatch.dylib 0x000000018059a950 _dispatch_client_callout
7 libdispatch.dylib 0x00000001805a20ac _dispatch_lane_serial_drain
8 libdispatch.dylib 0x00000001805a2c10 _dispatch_lane_invoke
9 libdispatch.dylib 0x00000001805ad318 _dispatch_workloop_worker_thread
10 libsystem_pthread.dylib 0x00000001f0d651b0 _pthread_wqthread

[RobbieElias]

I'm having the same issue as well

[iosdec]

Also having this issue, anybody solve this?

[jamestapping]

I had a crash when coming to foreground, possibly to do with resolving an address.

public static func getIPv4AddressFromHost(host: String) throws -> Data {
var streamError = CFStreamError()
let cfhost = CFHostCreateWithName(nil, host as CFString).takeRetainedValue()
let status = CFHostStartInfoResolution(cfhost, .addresses, &streamError)

I'll change the hostname to an IP and report back.

[SerhiienkoOleksii]

I had a same issue and was able to solve it by making:

public private(set) var responses: [PingResponse] = []

and

private var erroredIndices = [Int]()

threadsafe.
These two arrays are used from different threads which is a reason of that crash.
You can try to replace them with:

private var _responses: [PingResponse] = []
public private(set) var responses: [PingResponse] {
    get {
        _serial_property.sync { self._responses }
    }
    set {
        _serial_property.sync { self._responses = newValue }
    }
}

and

private var _erroredIndices = [Int]()
private var erroredIndices: [Int] {
    get {
        _serial_property.sync { self._erroredIndices }
    }
    set {
        _serial_property.sync { self._erroredIndices = newValue }
    }
}