app is crashing due to tiny_malloc_from_free_list - iphone

Question

Am working on an iPhone app,everything was going fine until I faced this crash, tiny_malloc_from_free_list. I am not sure why this crash is happening all of a sudden.Tried to google it but seems there aint enough suggestions to fix this one.
Please suggest any ideas how I can fix this problem.
Thanks,
Manoj
for reference here are some methods:
-(void) fetchProfileData
{
// Implemented ASIHTTP Request APIs
NSURL *url = [[NSURL URLWithString:SERVICE_NAME_PROFILEMANAGER] autorelease];
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setValidatesSecureCertificate:NO];
[request setUsername:[[LoginManager sharedInstance] userName]];
[request setPassword:[[LoginManager sharedInstance] passWord]];
[request setDelegate:self];
[self.view addSubview:autheticateIndicator];
[autheticateIndicator startAnimating];
[authenticationLabel setHidden:NO];
[request startAsynchronous];
}
- (void)requestFinished:(ASIHTTPRequest *)request
{
NSData *responseData = [request responseData];
NSString *theXml = [[NSString alloc] initWithData:responseData encoding:NSASCIIStringEncoding];
[NSThread detachNewThreadSelector:#selector(parseXML:) toTarget:self withObject:theXml];
[autheticateIndicator stopAnimating];
[theXml release];
}
-(void) parseXML:(NSString *)xmlData
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
[profilePersonnelNumber removeAllObjects];
// Load and parse the string data
tbxml = [[TBXML tbxmlWithXMLString:xmlData] retain];
// If TBXML found a root node, process element and iterate all children
if (tbxml.rootXMLElement) {
[self traverseElement:tbxml.rootXMLElement];
}
if ([profilePersonnelNumber count] > 0 ) {
NSDictionary *dict = [profilePersonnelNumber objectAtIndex:0];
if ([dict objectForKey:#"PersonnelNumber"])
{
[array release];
array = [[NSMutableArray arrayWithObjects:[dict valueForKey:#"PersonnelNumber"], nil] retain];
NSMutableString * result = [[NSMutableString alloc] init];
for (NSObject * obj in array)
{
[result appendString:[obj description]];
[[LoginManager sharedInstance] personnelNumber:[obj description]];
}
[result release];
}
}
[tbxml release];
[pool release];
//TODO: Uncomment this part, must required
if ([profilePersonnelNumber count] > 0) {
UITabBarController *controller = self.tabBarController;
[self presentModalViewController:controller animated:YES];
}
}