iOS Crash Symbolication

Question

I'm trying to symbolicate a crash reported. I have all the necessary dsym's, the original archive, and a couple unsymbolicated crash logs. I have attempted to fully symbolicate the crash logs using the symbolicatecrash tool provided by Xcode, but it is only symbolicating the symbols from my app:

Last Exception Backtrace:
0   CoreFoundation                  0x185b1fd38 0x1859de000 + 1318200
1   libobjc.A.dylib                 0x185034528 0x18502c000 + 34088
2   AVFoundation                    0x18b3d4208 0x18b31d000 + 750088
3   Shortcuts                       0x1004d47ec 

FlashlightManager.setBrightness(brightness:) + 378860 (FlashlightManager.swift:40)
4   Shortcuts                       0x1004af9a4 specialized FlashlightJavascriptExport.toggle() + 227748 (FlashlightJavascriptExport.swift:0)
5   CoreFoundation                  0x185b276a0 0x1859de000 + 1349280
6   CoreFoundation                  0x185a06820 0x1859de000 + 165920
7   JavaScriptCore                  0x18cb80d3c 0x18c41f000 + 7740732
8   JavaScriptCore                  0x18cb8048c 0x18c41f000 + 7738508
9   JavaScriptCore                  0x18cb80924 0x18c41f000 + 7739684

As you can see, something in the setBrightness method of the FlashlightManager is causing an issue. However, I cannot see a way that this might be causing a crash:

func setBrightness(brightness: Float) throws {
    guard let avDevice = self.avDevice else {
        throw FlashlightManagerExceptions.noTorch
    }

    try avDevice.lockForConfiguration()
    if brightness > 0 {
        try avDevice.setTorchModeOn(level: brightness)
    } else {
        avDevice.torchMode = .off
    }
    currentBrightness = brightness
    avDevice.unlockForConfiguration()
}

Since the crash report isn't giving me any more details and I do not see anything obvious in this method, I am unable to determine the cause of the crash.

Is there any way to symbolicate the the other parts of the stack trace from CoreFoundation, libobjc.A.dylib, and AVFoundation so that I can get more information about this crash?

Possible duplicate of [Atos does not symbolicate system frameworks/libraries properly](https://stackoverflow.com/questions/26079056/atos-does-not-symbolicate-system-frameworks-libraries-properly) — Matusalem Marques, Oct 25 '17 at 03:12
While that answer led me down the right path, it was not actually my issue. — Jake, Oct 25 '17 at 03:16

score 1 · Accepted Answer · answered Oct 25 '17 at 03:22

It turns out that I didn't have the system framework symbols for iOS 11.0.3 locally, so symbolicatecrash wasn't able to symbolicate the system framework symbols.

I was able to see that I didn't have the necessary symbols by referencing the answer to this question: Atos does not symbolicate system frameworks/libraries properly

Once I installed iOS 11.0.3 on my device and connected my device to Xcode, the symbols for iOS 11.0.3 were automatically downloaded and symbolicatecrash started working for the entire crash log.

iOS Crash Symbolication

1 Answers1