在iOS TestFlight设备上发生SIGSEGV崩溃

Question

我有一个奇怪的崩溃，只发生在TestFlight ad hoc发行版上。 我知道导致崩溃的原因（简单的循环，见下文），但我不明白为什么它不会在我的模拟器上崩溃，也不会在iPhone或iPad（带有开发配置文件）上崩溃。

我不断发布adhoc构建来追踪崩溃，但我终于放弃了。 如何更有效地跟踪此错误？

这是TestFlight崩溃报告：

    Exception reason

SIGSEGV

Stacktrace

PRIMARY THREAD THREAD 0

0 Meernotes 0x0019649a testflight_backtrace + 158
1 Meernotes 0x001970c4 TFSignalHandler + 244
2 libsystem_c.dylib 0x32d9d7ec _sigtramp + 48
3 libobjc.A.dylib 0x37d34eac _ZN12_GLOBAL__N_119AutoreleasePoolPage3popEPv + 224
4 libobjc.A.dylib 0x37d34eac _ZN12_GLOBAL__N_119AutoreleasePoolPage3popEPv + 224
5 libobjc.A.dylib 0x37d34dc8 _objc_autoreleasePoolPop + 12
6 CoreFoundation 0x358e1cfe _CFAutoreleasePoolPop + 18
7 UIKit 0x333d5c92 _wrapRunLoopWithAutoreleasePoolHandler + 42
8 CoreFoundation 0x35965b1a __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 18
9 CoreFoundation 0x35963d56 __CFRunLoopDoObservers + 258
10 CoreFoundation 0x359640b0 __CFRunLoopRun + 760
11 CoreFoundation 0x358e74a4 CFRunLoopRunSpecific + 300
12 CoreFoundation 0x358e736c CFRunLoopRunInMode + 104
13 GraphicsServices 0x37583438 GSEventRunModal + 136
14 UIKit 0x333f3cd4 UIApplicationMain + 1080
15 Meernotes 0x000850da main (main.m:16)
16 Meernotes 0x0008508f start + 39

这是触发它的代码（但在模拟器/ iphone上没问题）：

        while (textStillFits) {

        textToBeKeptBeforeCutting = textToBeKept;
        textToBeMovedBeforeCutting = textToBeMoved;

        rangeCutOffPosition = [settings determineFirstCutOffRangeOfString:textToBeMoved];
        textToBeKeptTemp = [textToBeMoved substringToIndex:rangeCutOffPosition.location];
        textToBeMovedTemp = [textToBeMoved substringFromIndex:rangeCutOffPosition.location];
        textToBeMoved = textToBeMovedTemp;
        textToBeKept = [NSString stringWithFormat:@"%@%@", textToBeKept, textToBeKeptTemp];
        NSUInteger l = [settings linesOfText:textToBeKept];
        if (l > maxLines) {
            textStillFits = NO;
            textToBeKept = textToBeKeptBeforeCutting;
            textToBeMoved = textToBeMovedBeforeCutting;
            // brakes here!
        }else {
            textStillFits = YES;
        }
    }

我看了一下这个，但它没有帮助： ad hoc iphone sigsegv崩溃

更多上下文，正如@ott所提到的，NSNotFound可能会导致这种情况：

    -(NSRange)determineFirstCutOffRangeOfString:(NSString *)s {

    NSRange rangeSpace = [s rangeOfString:@" " options:NSCaseInsensitiveSearch];
    NSRange rangeReturn = [s rangeOfString:@"\n" options:NSCaseInsensitiveSearch];
    if (rangeSpace.location == NSNotFound && rangeReturn.location == NSNotFound) {
        rangeSpace = NSMakeRange(1, 0); // don't take 0,0 as this will lead to endless loop
        rangeReturn = NSMakeRange(1, 0);
        NSLog(@"NEITHER SPACE NOR RETURN FOUND");
    }

    NSRange rangeCutOffPosition = NSMakeRange(0, 0);
    if (rangeSpace.location < rangeReturn.location) {
        // i.e. if the space char is the lowest char where you can cut off
        rangeCutOffPosition = NSMakeRange(rangeSpace.location+1,0); // +1, i.e. always cut off AFTER the space
    }  else {
        // i.e. if the return char is the lowest char where you can cut off
        rangeCutOffPosition = NSMakeRange(rangeReturn.location+1,0); // +1, i.e. always cut off AFTER the return
    }

    return rangeCutOffPosition;
}

Answer 1

他们最新的sdk 1.2.4解决了这个问题！