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I had a crash on an iPhone 4 with an exception type of EXC_GUARD. I can't find any information on this particular exception via google (only 1 result) or on stackoverflow. What is it?
Version: ??? (???) Code Type: ARM (Native) Parent Process: launchd [1] Date/Time: 2012-10-24 14:29:53.740 -0700 OS Version: iOS 6.0 (10A403) Report Version: 104 Exception Type: EXC_GUARD Exception Codes: 0x0000000100000010, 0x08fd4dbfade2dead Crashed Thread: 0 Thread 0 name: MAIN Dispatch queue: com.apple.main-thread Thread 0 Crashed: 0 libsystem_kernel.dylib 0x32f25294 close + 8 1 Twine 0x00230b8e close_file + 10 2 Twine 0x00218774 -[TFAirTrafficController startSession] + 752 3 Twine 0x002169fa +[TestFlight takeOff:] + 122 
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EXC_GUARD indicates the process violated a guarded resource protection. Although there are multiple types of guarded system resources, most guarded resource crashes are from guarded file descriptors, which have the GUARD_TYPE_FD value in the Exception Subtype field.
EXC_BREAKPOINT (SIGTRAP) is a trace trap interrupted the process. It gives an attached debugger, if any, a chance to interrupt the process at a specific point in its execution.
https://devforums.apple.com/message/713606
It's a bug in TestFlight causing a close on a duff file handle. This causes that crash.
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