SecItemCopyMatching (crash)

I found a crash by chance. It doesn't come up often. I upload the crash log. it seems the SecItemCopyMatching crashes. but I don not find the reason.

    

    static LMNetwork * aInstance = nil;

    static dispatch_once_t onceToken;

    dispatch_once(&onceToken, ^{

        aInstance = [[LMNetwork alloc] init];

        //检测网络连接状态

        [aInstance checkNetWorkStatus];

    });

    

    return aInstance;

}

- (instancetype)init{

  if (self = [super init]){ 

    
    self.networkQueue = dispatch_queue_create("com.aqara.network.queue", DISPATCH_QUEUE_CONCURRENT);

    self.backQueueManager.completionQueue = self.networkQueue;


    self.ioQueue = dispatch_queue_create("com.aqara.read.country.file", DISPATCH_QUEUE_CONCURRENT);

      dispatch_sync(self.ioQueue, ^{

          NSString* countryCode = [LMKeyChain objectForKey:@"loginCountryCode"];

          [LMKeyChain removeObjectForKey:@"loginCountryCode"];
      });
}

LMKeyChain.m

+ (NSString*)objectForKey:(NSString*)key

{
[crash8.txt](https://developer.apple.com/forums/content/attachment/22a65c6b-fa57-4f15-97cc-70640330cfa9)

 NSMutableDictionary *keychainQuery = [NSMutableDictionary dictionaryWithObjectsAndKeys:

                                              (__bridge id)kSecClassGenericPassword,(__bridge id)kSecClass,

                                              key, (__bridge id)kSecAttrService,

                                              key, (__bridge id)kSecAttrAccount,

                                              (__bridge id)kSecAttrAccessibleAfterFirstUnlock,(__bridge id)kSecAttrAccessible,

                                              nil];

        [keychainQuery setObject:(__bridge id)kCFBooleanTrue forKey:(__bridge id)kSecReturnData];

        [keychainQuery setObject:(__bridge id)kSecMatchLimitOne forKey:(__bridge id)kSecMatchLimit];

        CFDataRef keyData = NULL;

        if (SecItemCopyMatching((__bridge CFDictionaryRef)keychainQuery, (CFTypeRef *)&keyData) == noErr) {

            @try {

                ret = [NSKeyedUnarchiver unarchiveObjectWithData:(__bridge NSData *)keyData];

            } @catch (NSException *e) {

                NSLog(@"Keychain Unarchive of %@ failed: %@", key, e);

            }

        }