SIGBUS의 원인은 무엇입니까?

Question

우리는 SIGBUS (BUS_ADRALN)을 얻었고이 스레드를 가리 킵니다. 이 오류의 원인은 무엇입니까? 68 행 중 하나입니다 NSString * dateString = [dateFormat stringFromDate : currentTimestamp]; 또는 [dateFormat release];

NSDate *currentTimestamp = self.timestamp; 

if (!currentTimestamp) 
    return nil; // sanity check 

[currentTimestamp retain]; 

NSDateComponents *otherDay = [[NSCalendar currentCalendar] components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit fromDate:currentTimestamp]; 
NSDateComponents *today = [[NSCalendar currentCalendar] components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit fromDate:[NSDate date]]; 
NSDateComponents *yesterday = [[NSCalendar currentCalendar] components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit fromDate:[[NSDate date] addTimeInterval: -24 * 60 * 60]]; 

if ([today day] == [otherDay day] && 
    [today month] == [otherDay month] && 
    [today year] == [otherDay year]) { 

    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init]; 
    [dateFormat setDateFormat:@"h:mm a"]; 
    NSString *dateString = [dateFormat stringFromDate:currentTimestamp]; 
    [dateFormat release]; 
    [currentTimestamp release]; 
    return [NSString stringWithFormat:@"Today %@", dateString]; 
} 
else if ([yesterday day] == [otherDay day] && 
     [yesterday month] == [otherDay month] && 
     [yesterday year] == [otherDay year]) { 

    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init]; 
    [dateFormat setDateFormat:@"h:mm a"]; 
    NSString *dateString = [dateFormat stringFromDate:currentTimestamp]; 
    [dateFormat release]; 
    [currentTimestamp release]; 
    return [NSString stringWithFormat:@"Yesterday %@", dateString]; 
} 

NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init]; 
[dateFormat setDateFormat:@"MM/dd/yyyy h:mm a"]; 

// below is line 68 
NSString *dateString = [dateFormat stringFromDate:currentTimestamp]; 
[dateFormat release]; 
[currentTimestamp release]; 

return dateString; 

0 CoreFoundation      0x33474894 CFDateFormatterCreateStringWithAbsoluteTime + 60 
1 CoreFoundation      0x33474817 CFDateFormatterCreateStringWithDate + 31 
2 Foundation       0x326c4ad7 -[NSDateFormatter stringForObjectValue:] + 91 
3 Foundation       0x326c4a75 -[NSDateFormatter stringFromDate:] + 21 
4 MyApp        0x000a81dc -[Message getFormattedTimestamp] (Message.m:68) 
5 MyApp        0x0007b7a4 -[ConversationView newBubble:withFrame:] (ConversationView.m:452) 
6 MyApp        0x0007b2fc -[ConversationView tableView:heightForRowAtIndexPath:] (ConversationView.m:520) 
7 UIKit        0x31bb3b09 -[UISectionRowData refreshWithSection:tableView:tableViewRowData:] + 2173 
8 UIKit        0x31bb3225 -[UITableViewRowData numberOfRows] + 73 
9 UIKit        0x31bb2c73 -[UITableView noteNumberOfRowsChanged] + 83 
10 UIKit        0x31bb27f7 -[UITableView reloadData] + 583 
11 MyApp        0x0007cccc -[ConversationView reloadAndMoveToEnd:] (ConversationView.m:147) 
12 MyApp        0x0007cc6c -[ConversationView managedObjectContext:fetchCompletedForRequest:withResults:error:] (ConversationView.m:153) 
13 MyApp        0x00197670 -[IZManagedObjectContext backgroundFetchOperation:completedWithIDs:error:] (IZManagedObjectContext.m:150) 
14 MyApp        0x001970b0 -[IZBackgroundFetchOperation fetchRequestDidCompleteWithUserInfo:] (IZBackgroundFetchOperation.m:108) 
15 CoreFoundation      0x3347df03 -[NSObject(NSObject) performSelector:withObject:] + 23 
16 Foundation       0x327237a9 __NSThreadPerformPerform + 269 
17 CoreFoundation      0x334e7a79 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 13 
18 CoreFoundation      0x334e975f __CFRunLoopDoSources0 + 383 
19 CoreFoundation      0x334ea4eb __CFRunLoopRun + 231 
20 CoreFoundation      0x3347aec3 CFRunLoopRunSpecific + 231 
21 CoreFoundation      0x3347adcb CFRunLoopRunInMode + 59 
22 GraphicsServices     0x311a541f GSEventRunModal + 115 
23 GraphicsServices     0x311a54cb GSEventRun + 63 
24 UIKit        0x31b90d69 -[UIApplication _run] + 405 
25 UIKit        0x31b8e807 UIApplicationMain + 671 
26 MyApp        0x0009b578 main (main.m:5) 

Answer 1

위 코드는 단원 테스트를 작성한 결과입니다. 그것이 메모리 문제였던 것으로 밝혀졌습니다. 이상한 일은 항상이 줄을 지적합니다.