They have poor corporate governance and plenty of doubtful debts. In fact, when they got QFB & RMB clearing licence in Singapore, none of their senior staff from China have any understanding of the stringent international banking regulatory requirements. So they really hired the locals to do the necessary paperworks. Even today, China's banking regulatory framework is at least 15 years behind HK or Singapore (I am citing the Asian financial crisis era).
but don't worry. By right, all china banks are considered owned by provincial govt or state-owned.
So implied that govt will bail all of them out.