HI David, I have compiled your test code with the attached CmakeLists.txt and can confirm I get the crash on my Kubuntu 13.04 + 64bit system.
With running gdb: (gdb) run 48 1000000 2 2 The stack track I'm getting is: *** Error in `/home/robert/Contributors/DavidFries/threadednotify': double free or corruption (top): 0x00007fffd8000b40 *** *** Error in `/home/robert/Contributors/DavidFries/threadednotify[New Thread 0x7fffe0ff9700 (LWP 6024)] Program received signal SIGABRT, Aborted. [Switching to Thread 0x7ffff0ee7700 (LWP 6017)] 0x00007ffff6dee037 in raise () from /lib/x86_64-linux-gnu/libc.so.6 (gdb) where #0 0x00007ffff6dee037 in raise () from /lib/x86_64-linux-gnu/libc.so.6 #1 0x00007ffff6df1698 in abort () from /lib/x86_64-linux-gnu/libc.so.6 #2 0x00007ffff6e2b5ab in ?? () from /lib/x86_64-linux-gnu/libc.so.6 #3 0x00007ffff6e37a46 in ?? () from /lib/x86_64-linux-gnu/libc.so.6 #4 0x00007ffff742f2a9 in std::basic_stringbuf<char, std::char_traits<char>, std::allocator<char> >::overflow(int) () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6 #5 0x00007ffff7433976 in std::basic_streambuf<char, std::char_traits<char> >::xsputn(char const*, long) () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6 #6 0x00007ffff7426b83 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6 #7 0x00007ffff7427dc4 in std::ostreambuf_iterator<char, std::char_traits<char> > std::num_put<char, std::ostreambuf_iterator<char, std::char_traits<char> > >::_M_insert_int<long>(std::ostreambuf_iterator<char, std::char_traits<char> >, std::ios_base&, char, long) const () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6 #8 0x00007ffff7427f2d in std::num_put<char, std::ostreambuf_iterator<char, std::char_traits<char> > >::do_put(std::ostreambuf_iterator<char, std::char_traits<char> >, std::ios_base&, char, long) const () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6 #9 0x00007ffff742adf6 in std::ostream& std::ostream::_M_insert<long>(long) () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6 #10 0x000000000040299a in Spam::run (this=0x60d9b8) at /home/robert/Contributors/DavidFries/ThreadedNotify.cpp:88 #11 0x00007ffff769c7d0 in OpenThreads::ThreadPrivateActions::StartThread(void*) () from /home/robert/OpenSceneGraph/lib/libOpenThreads.so.14 #12 0x00007ffff6ba1f8e in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0 #13 0x00007ffff6eb0e1d in clone () from /lib/x86_64-linux-gnu/libc.so.6 This suggests the ostream being shared between threads is not thread safe. I don't believe it's the Notify.cpp code itself that is directly causing the problem, rather it looks to be that ostream implementation is the problem. Solving may not be easy without having a ostream per thread. Thoughts? Robert.
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