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Today my iPhone shut off instantly as I pressed the sleep/wake button to wake its screen; the phone was on. There was no spinning animation as it shut down. I briefly saw the screen flash to the "locked" view before it went black.

When I restarted the phone it indicated that I had 42% battery remaining.

At the time of the "crash", I was near the finish of a 2.5 mile run, and I was running a development build of iMapMyFitness. It was relatively cold outside -- probably between 30 and 40 degrees F.

I downloaded an app called System Log, and it shows the following two diagnostics with timestamps just before the crash. The next diagnostic is approximately 8 minutes later after I restarted the phone.

Message
    Exiting...
Facility
    com.apple.console
ASLMessageID
    655
Level
    5
Sender
    com.apple.assetsd
Time
    1325797737
PID
    78

Message
    MultitouchHID(1cd0e030) uilock state: 0 -> 1
Facility
    kern
ASLMessageID
    656
Level
    5
Sender
    SpringBoard
Time
    1325797751
PID
    30

Is this indicative of an iOS defect, an app defect, a hardware problem, or even something else?

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migrated from stackoverflow.com Jan 7 '12 at 4:17

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2  
I'm unclear on one point - are you a developer of iMapMyFitness, or an end user? –  Greg Hewgill Jan 5 '12 at 23:55
4  
The log you pasted is irrelevant. –  Kevin Ballard Jan 5 '12 at 23:57
    
I am a developer, and I do work at MapMyFitness. This is absolutely a software development question. The premise of the question is: could my app be causing the OS crash I observed, and if so, how could I isolate the cause so that I can fix it? –  Matt McClure Jan 6 '12 at 3:44
1  
This log doesn't give you any hints on what the problem is, it is just a list of what did send messages to the console. And the messages basically say "shutting down". Is there are crash report available? –  Kerni Jan 6 '12 at 14:53
    
I would love to know how to get a kernel crash report from my iPhone. Is there a way? How? –  Matt McClure Jan 6 '12 at 20:30

1 Answer 1

It's a software problem, however, with the log you posted, it's hard to tell exactly what caused it.

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Do you know where I can find a kernel log with more information? –  Matt McClure Jan 7 '12 at 13:11
    
You might be able to find something with a jailbreak, but other than that, I don't think so. –  Dustin L. Jan 8 '12 at 7:50

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