CFNetwork Crash macOS 10.11.6

We haven't had our app updated on macOS 10.11 for 2/3 years but suddenly our users are seeing a crash when the app attempts to sync. The crashlogs indicate:

Code Block 
libsystem_kernel.dylib
0x7fff9bca2000 + 93958
libsystem_c.dylib
0x7fff8c157000 + 386783
libsystem_c.dylib
0x7fff8c157000 + 155096
CFNetwork
0x7fff8bcf0000 + 932124
libdispatch.dylib
0x7fff9b6a4000 + 55613
libdispatch.dylib
0x7fff9b6a4000 + 9227


Any idea what I need to do? Reported as bug: FB9097483
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We haven't had our app updated on macOS 10.11 for 2/3 years but
suddenly our users are seeing a crash when the app attempts to sync.

If you’re app hasn’t changed that leaves a number of possibilities:

  • The OS has changed; Apple does ship security updates for old systems on occasion.

  • The server it’s talking to has changed.

  • Something else in the environment has changed.

At a first step I’d work to rule out OS changes. You should survey your crash reports to determine the range of OSes they occur on, and then look up the release dates of that OSes.

Also, can you post a full Apple crash report here. Use the text attachment feature (the paperclip icon) to avoid clogging up the timeline.

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