zxing dead loop while detecting qrcode

[shlwang]

There is a server for image transferring. when an image comes to system, it is detected by zxing for qrcode. The server works well most of the time. Sometime, there happens a dead loop. The call stack is as follows.
Thread 1 (process 47568):
#0 0x000000000053c222 in __gnu_cxx::_normal_iteratorzxing::Ref<zxing::qrcode::FinderPattern, std::vectorzxing::Ref<zxing::qrcode::FinderPattern, std::allocatorzxing::Ref<zxing::qrcode::FinderPattern > > >::_normal_iterator(zxing::Refzxing::qrcode::FinderPattern const&) ()
#1 0x000000000053c27b in std::vectorzxing::Ref<zxing::qrcode::FinderPattern, std::allocatorzxing::Ref<zxing::qrcode::FinderPattern > >::begin() ()
#2 0x000000000053f5d0 in std::vectorzxing::Ref<zxing::qrcode::FinderPattern, std::allocatorzxing::Ref<zxing::qrcode::FinderPattern > >::_M_insert_aux(__gnu_cxx::__normal_iteratorzxing::Ref<zxing::qrcode::FinderPattern*, std::vectorzxing::Ref<zxing::qrcode::FinderPattern, std::allocatorzxing::Ref<zxing::qrcode::FinderPattern > > >, zxing::Refzxing::qrcode::FinderPattern const&) ()
#3 0x000000000053f7fa in std::vectorzxing::Ref<zxing::qrcode::FinderPattern, std::allocatorzxing::Ref<zxing::qrcode::FinderPattern > >::push_back(zxing::Refzxing::qrcode::FinderPattern const&) ()
#4 0x000000000053b08e in zxing::multi::MultiFinderPatternFinder::selectBestPatterns() ()
#5 0x000000000053bcd2 in zxing::multi::MultiFinderPatternFinder::findMulti(zxing::DecodeHints const&) ()
#6 0x00000000005396b3 in zxing::multi::MultiDetector::detectMulti(zxing::DecodeHints) ()
#7 0x0000000000536da0 in zxing::multi::QRCodeMultiReader::decodeMultiple(zxing::Refzxing::BinaryBitmap, zxing::DecodeHints) ()
#8 0x0000000000501770 in BarcodeDecoder::decode(std::basic_string<char, std::char_traits, std::allocator > const&, unsigned char*, unsigned long, std::basic_string<char, std::char_traits, std::allocator >&) ()
#9 0x000000000047dc1a in WWS::FtsHandler::onSendAck(unsigned long) ()
#10 0x000000000047fd80 in WWS::FtsHandler::onPackData(char const*, unsigned long) ()
#11 0x0000000000480090 in WWS::FtsHandler::onPackHead(char const*, unsigned long) ()
#12 0x00000000004800eb in WWS::FtsHandler::onData(char const*, unsigned long) ()
#13 0x0000000000480334 in WWS::FtsHandler::onRecv(char const*, unsigned long) ()
#14 0x00000000004bce92 in WWS::Asynchat::onCanRead() ()
#15 0x00000000004c6c79 in WWS::Poller::poll(int) ()
#16 0x00000000004c9e93 in WWS::PollerThread::thread() ()
#17 0x00000000004b20b4 in WWS::threadFunction(void*) ()
#18 0x00007f0a758a873d in start_thread () from /lib64/libpthread.so.0
#19 0x0000003faa2d44bd in clone () from /lib64/libc.so.6

[srowen]

This code was removed from this project a while ago.