aix c++后台程序运行报错，异常退出，求救...

Segmentation fault in std::list<xnet::TXNetData*,std::allocator<xnet::TXNetData*> >::begin() at line 299 in file "/usr/vacpp/include/list"
  299                           : _Acc::_Next(_Head))); }
(dbx) where
std::list<xnet::TXNetData*,std::allocator<xnet::TXNetData*> >::begin()(this = 0x0000000000000200, __classReturn = &(...)), line 299 in "list"
std::list<xnet::TXNetData*,std::allocator<xnet::TXNetData*> >::front()(this = 0x0000000000000200), line 332 in "list"
unnamed block in xnet::TemplatePriorityQueue<xnet::TXNetData*>::GetMessage()(this = 0x0000000110076970), line 168 in "safestl.h"
xnet::TemplatePriorityQueue<xnet::TXNetData*>::GetMessage()(this = 0x0000000110076970), line 168 in "safestl.h"
xnet::TXNetSock::WriteThread()(this = 0x0000000110076830), line 66 in "xnetsock.cpp"
xnet::XnetsockCreateWriteThread(void*)(owner = 0x0000000110076830), line 38 in "xnetsock.cpp"

有高手了解aix std::list实现机制么？按调试结果只知道报错是有std::list对象a.front()取值时退出，请教此错误是什么原因引起？真让人莫名奇妙啊，在线等结果

高手在的吼一声啊，自己顶一个！