警告我在问题中提供的代码可能会使matlab和您的机器崩溃！

我已经为C类编写了一个mex网关函数 . 如果我使用R2008a在32Bit windows上编译这个mex函数我没有问题 . 如果我在运行64位Scientific Linux（Red Hat Enterprize Linux版本）的Matlab R2011a上编译并运行，那么在调用mexfunction时，matlab将以段错误退出，尽管它似乎在程序的中途运行 . 可以在两个平台上的Matlab之外编译和运行C类（使用main函数），没有错误 . 我在Windows机器上使用Microsoft Visual C Express Edition，在Linux机器上使用gcc 4.4.5 .

造成这种情况的原因是什么？我能解决吗？

可以从http://www.see.ed.ac.uk/~s0237326/downloads/mexcrash.zip下载包含重现问题所需的代码和数据文件的zip文件 . 此zip文件包含.m和.cpp源代码，以及用于测试的文本文件（Temp.fem，10kB） . 文件fmeshersetup.m显示了我用来编译的命令 . 文件Test_mexfmesher.m运行带有适当输入的mexfunction进行测试 . mex网关功能是mexfmesher.cpp，它调用fmesher类，它由fmesher目录中的文件组成 .

总共有13个C源文件，有点期待有人调试，甚至是发生段错误的特定行也会引起人们的兴趣 .

不幸的是，我无法访问可以与Matlab连接的64位Linux上的图形化调试器，并且希望有人能够立即看到问题，或者这将是一个已知问题 . 如上所述，当不作为mex文件运行时，程序运行正常，所以我无法在另一个工具中找到错误，而且我对gdb不是很熟悉 . 我认为问题可能与调用C函数'free'有关 .

以下是segfault的回溯：

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff721be36 in ?? () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/libmwservices.so
(gdb) backtrace
#0  0x00007ffff721be36 in ?? () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/libmwservices.so
#1  0x00000034daa914f2 in std::basic_ostream<char, std::char_traits<char> >::flush() () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/libstdc++.so.6
#2  0x00007ffff72302b0 in ioFlush () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/libmwservices.so
#3  0x00007ffff61303f5 in ?? () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/libmwm_interpreter.so
#4  0x00007ffff61330ec in ?? () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/libmwm_interpreter.so
#5  0x00007ffff6130c7a in ?? () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/libmwm_interpreter.so
#6  0x00007ffff6131741 in ?? () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/libmwm_interpreter.so
#7  0x00007ffff618a7d9 in ?? () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/libmwm_interpreter.so
#8  0x00007ffff686d7ef in Mfh_file::dispatch_fh(int, mxArray_tag**, int, mxArray_tag**) () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/libmwm_dispatcher.so
#9  0x00007ffff61731f0 in ?? () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/libmwm_interpreter.so
#10 0x00007ffff6114975 in ?? () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/libmwm_interpreter.so
#11 0x00007ffff612e96e in ?? () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/libmwm_interpreter.so
#12 0x00007ffff61330ec in ?? () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/libmwm_interpreter.so
#13 0x00007ffff6130c7a in ?? () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/libmwm_interpreter.so
#14 0x00007ffff6131741 in ?? () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/libmwm_interpreter.so
#15 0x00007ffff618a7d9 in ?? () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/libmwm_interpreter.so
#16 0x00007ffff686d7ef in Mfh_file::dispatch_fh(int, mxArray_tag**, int, mxArray_tag**) () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/libmwm_dispatcher.so
#17 0x00007ffff61669b2 in ?? () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/libmwm_interpreter.so
#18 0x00007ffff6128e13 in ?? () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/libmwm_interpreter.so
#19 0x00007ffff6127eb7 in ?? () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/libmwm_interpreter.so
#20 0x00007ffff6128397 in ?? () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/libmwm_interpreter.so
#21 0x00007ffff6d378fe in ?? () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/libmwbridge.so
#22 0x00007ffff6d384ae in mnParser () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/libmwbridge.so
#23 0x00007ffff6ae0d39 in mcrInstance::mnParser_on_interpreter_thread() () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/libmwmcr.so
#24 0x00007ffff6ac3db2 in ?? () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/libmwmcr.so
#25 0x00007ffff6ac3ec0 in ?? () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/libmwmcr.so
#26 0x00007fffee8badb6 in ?? () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/../../bin/glnxa64/libmwuix.so
#27 0x00007fffee8c413d in ?? () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/../../bin/glnxa64/libmwuix.so
#28 0x00007fffef3110bd in sysq::during_F<boost::weak_ptr<sysq::ws_ppeHook>, boost::shared_ptr<sysq::ws_ppeHook> > std::for_each<__gnu_cxx::__normal_iterator<boost::weak_ptr<sysq::ws_ppeHook>*, std::vector<boost::weak_ptr<sysq::ws_ppeHook>, std::allocator<boost::weak_ptr<sysq::ws_ppeHook> > > >, sysq::during_F<boost::weak_ptr<sysq::ws_ppeHook>, boost::shared_ptr<sysq::ws_ppeHook> > >(__gnu_cxx::__normal_iterator<boost::weak_ptr<sysq::ws_ppeHook>*, std::vector<boost::weak_ptr<sysq::ws_ppeHook>, std::allocator<boost::weak_ptr<sysq::ws_ppeHook> > > >, __gnu_cxx::__normal_iterator<boost::weak_ptr<sysq::ws_ppeHook>*, std::vector<boost::weak_ptr<sysq::ws_ppeHook>, std::allocator<boost::weak_ptr<sysq::ws_ppeHook> > > >, sysq::during_F<boost::weak_ptr<sysq::ws_ppeHook>, boost::shared_ptr<sysq::ws_ppeHook> >) ()
   from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/../../bin/glnxa64/libuij.so
#29 0x00007fffef312989 in ?? () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/../../bin/glnxa64/libuij.so
#30 0x00007fffef30f4ae in svWS_ProcessPendingEvents(int, int, bool) () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/../../bin/glnxa64/libuij.so
#31 0x00007ffff6ac21c7 in ?? () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/libmwmcr.so
#32 0x00007ffff6ac260a in ?? () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/libmwmcr.so
#33 0x00007ffff6ac2d6f in ?? () from /opt/matlab-2011a/bin/glnxa64/../../bin/glnxa64/libmwmcr.so
#34 0x00000034d7a077e1 in start_thread () from /lib64/libpthread.so.0
#35 0x00000034d72e573d in clone () from /lib64/libc.so.6
(gdb) quit