Swift Static Array - pointer being freed was not allocated - ios

Question

I have a static array metricsTransactionData in ServiceRequest class. I am invoking multiple request continuously and sometimes I get this error "error for object 0x10b874cb0: pointer being freed was not allocated" on this line ServiceRequest.metricsTransactionData.append(samp). Pls help
public func urlSession(_ session: URLSession, task: URLSessionTask, didFinishCollecting metrics: URLSessionTaskMetrics) {
for mem in metrics.transactionMetrics {
var samp = MetricsData()
samp.requestDate = mem.requestStartDate
samp.responseDate = mem.responseEndDate
samp.url = mem.request.url?.absoluteString
ServiceRequest.metricsTransactionData.append(samp)
}
}
Stack trace:
* thread #3, queue = 'NSOperationQueue 0x6000001edb20 (QOS: UNSPECIFIED)', stop reason = signal SIGABRT
frame #0: 0x0000000106897b66 libsystem_kernel.dylib`__pthread_kill + 10
frame #1: 0x00000001068d1080 libsystem_pthread.dylib`pthread_kill + 333
frame #2: 0x0000000106644c45 libsystem_c.dylib`abort + 127
frame #3: 0x00000001067986e4 libsystem_malloc.dylib`malloc_vreport + 545
frame #4: 0x00000001067988d5 libsystem_malloc.dylib`malloc_report + 152
frame #5: 0x00000001049bd910 libswiftCore.dylib`_swift_release_dealloc + 16
frame #6: 0x0000000104980017 libswiftCore.dylib`assignWithTake value witness for Swift.Array + 23
frame #7: 0x00000001046f3a5a libswiftCore.dylib`(extension in Swift):Swift._ArrayBufferProtocol._arrayOutOfPlaceUpdate<A where A1: Swift._PointerFunction, A.Element == A1.Element>(inout Swift._ContiguousArrayBuffer<A.Element>, Swift.Int, Swift.Int, A1) -> () + 1146
frame #8: 0x000000010470aa11 libswiftCore.dylib`Swift.Array._copyToNewBuffer(oldCount: Swift.Int) -> () + 209
frame #9: 0x000000010470aaf0 libswiftCore.dylib`Swift.Array._makeUniqueAndReserveCapacityIfNotUnique() -> () + 192
frame #10: 0x000000010470ad98 libswiftCore.dylib`Swift.Array.append(A) -> () + 24

Answer 1

The error tells you that it is a very bad idea to use a static/global array that will be updated from various background tasks. Swift arrays are not thread-safe.
Means that your array gets resized by one task while another might already do the same, resulting in a bad memory access. Likely calling (at least) append in a DispatchQueue.main.async would fix the problem if you really have to do it that way, but if you want to maintain the order, you would need to handle synchronization yourself.
But in any way i strongly recommend that you find another solution that prevents that kind of write access to the array directly. Globally writable arrays are bad.