I am trying to analyse a crash log that a customer sent me, but I cannot get it to symbolicate the system library calls. It does symbolicate calls
In following answer of Kerni: You can install related Xcode with your target version of iOS and copy ~/Library/Developer/Xcode/iOS DeviceSupport/
I ran into this issue as well with an iOS7 app using XCode5, even though I had all the correct symbols.
What I found was that I had taken my dSYM file out of the archive where spotlight could index it, but the crashlog was only getting partically symbolicated (as seen in the question). But I had left the actual .app file in an xcarchive, and it was not able to be indexed by spotlight. As soon as I copied that file out of the archive to the visible location, I was able to symbolicate properly.
There are only two ways to solve this:
Usually the symbols are part of the latest Xcode release, but Apple doesn't always provide Xcode updates when an iOS version only contains bug-fixes but no API changes.