[SDL] strange persistent crash on ios

[Jeremy Jurksztowicz]

What signal is being thrown? Does it crash with signal "0", or SIGSEGV or
what?

Note that most unusual crashes in iOS are signal "0" crashes, when the OS
pulls the rug from under your app due to memory limitations. You've got to
be really conservative with memory on iOS, best to stay under 64 megs, under
40 is preferable, even on devices like the iPhone 4, with 512 megs of memory
:P !!!

That's for signal "0" crashes (which I can never get a stack trace for!).

On Thu, Sep 15, 2011 at 4:17 AM, Vittorio G. <vitto.giova at yahoo.it> wrote:

> hi all,
> I've finally been able to catch a weird crash that is happening in my
> ios application.
> After some minutes of testing on device the app misteriously crashes
> -- never happens on simulator. What I find strange is that this bug is
> persistent, always happens after some time of playing but if i leave
> the app on without interaction it never crashes.
> From the limited information of the backtrace below all I can gather
> is that something is 'distubing' the ios event queue, but I have no
> idea how I can debug this further.
> Is there any advice on how/what/why this is happening? Can anyone shed
> some light on the event queue processing on ios?
>
> thanks
> Vittorio
>
> Thread 0 name:  Dispatch queue: com.apple.main-thread
> Thread 0 Crashed:
> 0   CoreFoundation                      0x32973708
> ___CFBasicHashFindBucket_Linear + 120
> 1   CoreFoundation                      0x328c4db8 CFBasicHashRemoveValue +
> 368
> 2   CoreFoundation                      0x328c69e2 CFSetRemoveValue + 54
> 3   CoreFoundation                      0x328c63ae CFRunLoopRemoveTimer +
> 122
> 4   Foundation                          0x338a169a __NSFireDelayedPerform +
> 310
> 5   CoreFoundation                      0x32937a40
> __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 8
> 6   CoreFoundation                      0x32939ec4 __CFRunLoopDoTimer + 844
> 7   CoreFoundation                      0x3293a83e __CFRunLoopRun + 1082
> 8   CoreFoundation                      0x328caebc CFRunLoopRunSpecific +
> 224
> 9   CoreFoundation                      0x328cadc4 CFRunLoopRunInMode + 52
> 10  Hedgewars                           0x001914e4 UIKit_PumpEvents
> (SDL_uikitevents.m:49)
> 11  Hedgewars                           0x00160eac SDL_PumpEvents
> (SDL_events.c:302)
> 12  Hedgewars                           0x001917b4 UIKit_GL_SwapWindow
> (SDL_uikitopengles.m:94)
> 13  Hedgewars                           0x0018d3e8 SDL_GL_SwapWindow
> (SDL_video.c:2550)
> 14  Hedgewars                           0x00002e24 HWENGINE_DOTIMER$LONGINT
> + 456
> 15  Hedgewars                           0x000e3264 -[GameInterfaceBridge
> prepareEngineLaunch] (GameInterfaceBridge.m:160)
> 16  Hedgewars                           0x000e35b0 -[GameInterfaceBridge
> startLocalGame:] (GameInterfaceBridge.m:200)
> 17  Hedgewars                           0x000a74dc
> -[GameConfigViewController startGame:]
> (GameConfigViewController.m:238)
> 18  Hedgewars                           0x000a64dc
> -[GameConfigViewController buttonPressed:]
> (GameConfigViewController.m:55)
> 19  CoreFoundation                      0x328d056a -[NSObject(NSObject)
> performSelector:withObject:withObject:] + 18
> 20  UIKit                               0x32405ec2 -[UIApplication
> sendAction:to:from:forEvent:] + 78
> 21  UIKit                               0x32492c1a
> -[UIBarButtonItem(UIInternal) _sendAction:withEvent:] + 86
> 22  CoreFoundation                      0x328d056a -[NSObject(NSObject)
> performSelector:withObject:withObject:] + 18
> 23  UIKit                               0x32405ec2 -[UIApplication
> sendAction:to:from:forEvent:] + 78
> 24  UIKit                               0x32405e62 -[UIApplication
> sendAction:toTarget:fromSender:forEvent:] + 26
> 25  UIKit                               0x32405e34 -[UIControl
> sendAction:to:forEvent:] + 32
> 26  UIKit                               0x32405b86 -[UIControl(Internal)
> _sendActionsForEvents:withEvent:] + 350
> 27  UIKit                               0x3240641c -[UIControl
> touchesEnded:withEvent:] + 336
> 28  UIKit                               0x32404bee -[UIWindow
> _sendTouchesForEvent:] + 362
> 29  UIKit                               0x32404568 -[UIWindow sendEvent:] +
> 256
> 30  UIKit                               0x323ed30c -[UIApplication
> sendEvent:] + 292
> 31  UIKit                               0x323ecc4c
> _UIApplicationHandleEvent + 5084
> 32  GraphicsServices                    0x33433e70 PurpleEventCallback +
> 660
> 33  CoreFoundation                      0x32937a90
> __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 20
> 34  CoreFoundation                      0x32939838 __CFRunLoopDoSource1 +
> 160
> 35  CoreFoundation                      0x3293a606 __CFRunLoopRun + 514
> 36  CoreFoundation                      0x328caebc CFRunLoopRunSpecific +
> 224
> 37  CoreFoundation                      0x328cadc4 CFRunLoopRunInMode + 52
> 38  GraphicsServices                    0x33433418 GSEventRunModal + 108
> 39  GraphicsServices                    0x334334c4 GSEventRun + 56
> 40  UIKit                               0x32417d62 -[UIApplication _run] +
> 398
> 41  UIKit                               0x32415800 UIApplicationMain + 664
> 42  Hedgewars                           0x00193aa4 main
> (SDL_uikitappdelegate.m:55)
> 43  Hedgewars                           0x00002c50 start + 32
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