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  1. C++ Standard Library
  2. STDCXX-1058

std::basic_ios<>::copyfmt() with registered callback (via std::ios_base::register_callback()) run-time SIGABRT

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    Details

    • Type: Bug
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 4.2.1, 4.2.x, 4.3.x, 5.0.0
    • Fix Version/s: 4.2.x, 4.3.x
    • Component/s: 27. Input/Output
    • Environment:

      Solaris 10 and 11, Red Hat Linux, OpenSuSE Linux
      Sun C++ Compilers 12.1, 12.2, 12.3

      Defect is independent of platform or compiler.

    • Patch Info:
      Patch Available
    • Regression:
      Regression, Unit Test Broken
    • Severity:
      Runtime Error

      Description

      A stream with a registered callback via register_callback() SIGABRTs at run-time:

      #include <iostream>
      #include <fstream>
      
      int x;
      
      void testfun (std::ios_base::event ev, std::ios_base& iosobj, int index)
      {
        x = index;
      
        switch (ev)
        {
          case std::ios_base::copyfmt_event:
            std::cerr << "copyfmt_event" << std::endl; break;
          case std::ios_base::imbue_event:
            std::cerr << "imbue_event" << std::endl; break;
          case std::ios_base::erase_event:
            std::cerr << "erase_event" << std::endl; break;
          default:
            std::cerr << "unknown" << std::endl; break;
        }
      }
      
      int main ()
      {
        std::fstream f0;
        std::fstream f1;
        int i = 101;
      
        std::ios_base::event_callback e1 = &testfun;
        f0.register_callback (e1, i);
      
        x = 0;
        f0.imbue (std::cerr.getloc());
        if (x != i)
          std::cerr << "x: expected " << i << " got " << x << std::endl;
      
        x = 0;
        f0.copyfmt (f1);
        if (x != i)
          std::cerr << "x: expected " << i << " got " << x << std::endl;
      
        return 0;
      }
      

      Output from GCC 4.5.0:

      [steleman@darthvader][/src/steleman/programming/stdcxx-ss122/bugfixes-sunw/fstream.copyfmt][02/05/2012 0:32:42][1340]>> ./test-gcc 
      imbue_event
      erase_event
      

      Output from Sun C++ 12.2 with stlport4:

      [steleman@darthvader][/src/steleman/programming/stdcxx-ss122/bugfixes-sunw/fstream.copyfmt][02/05/2012 0:32:44][1341]>> ./test-ss12-stlport 
      imbue_event
      erase_event
      copyfmt_event
      erase_event
      

      Output from Sun C++ 12.2 with our stdcxx (patched):

      [steleman@darthvader][/src/steleman/programming/stdcxx-ss122/bugfixes-sunw/fstream.copyfmt][02/05/2012 0:32:58][1342]>> ./test-ss12-stdcxx 
      imbue_event
      erase_event
      

      Output from Pathscale 4.0.12.1 (which didn't patch stdcxx):

      [steleman@darthvader][/src/steleman/programming/stdcxx-ss122/bugfixes-sunw/fstream.copyfmt][02/05/2012 0:33:03][1343]>> ./test-pathscale 
      imbue_event
      erase_event
      *** glibc detected *** ./test-pathscale: double free or corruption (fasttop): 0x 000000000605480 ***
      ======= Backtrace: =========
      /lib64/libc.so.6(+0x73286)[0x7f78cbb7f286]
      /lib64/libc.so.6(cfree+0x6c)[0x7f78cbb8402c]
      /opt/pathscale/ekopath-4.0.12.1/lib/4.0.12.1/x8664/64/libcxxrt.so(_ZdlPv+0xd)[0x f78cc097d63]
      /opt/pathscale/ekopath-4.0.12.1/lib/4.0.12.1/x8664/64/libstl.so(_ZNSt8ios_base11 C_usr_data10_C_deallocEPS0_+0x2d)[0x7f78cc300b5b]
      ======= Memory map: ========
      00400000-00404000 r-xp 00000000 103:00 9582413                           /src/steleman/programming/stdcxx-ss122/bugfixes-sunw/fstream.copyfmt/test-pathscale
      00603000-00604000 r--p 00003000 103:00 9582413                           /src/steleman/programming/stdcxx-ss122/bugfixes-sunw/fstream.copyfmt/test-pathscale
      00604000-00605000 rw-p 00004000 103:00 9582413                           /src/steleman/programming/stdcxx-ss122/bugfixes-sunw/fstream.copyfmt/test-pathscale
      00605000-00626000 rw-p 00000000 00:00 0                                  [heap]
      
      [ ... ]
      

      I no longer have an unpatched stdcxx handy for the Sun C++ compilers available
      to reproduce the defect with the Sun C++ compiler.

      Defect is in file src/iostore.cpp, starting at line 275:

      _C_usr->_C_iarray, _C_usr->_C_parray and _C_usr->_C_cbarray
      are not set to NULL after deletion:

          _TRY {
              if (_C_usr) {
                  // fire erase events (27.4.4.2, p17) - may throw
                  if (_C_usr->_C_fire)
                      (this->*_C_usr->_C_fire)(erase_event, true /* reentrant */);
      
                  // delete existing arrays, if any; _C_usr will only be deleted
                  // if `rhs' contains no user data (see below)
                  operator delete (_C_usr->_C_iarray);
                  _C_usr->_C_iarray = 0UL; // <----- !!
                  operator delete (_C_usr->_C_parray);
                  _C_usr->_C_parray = 0UL; // <----- !!
                  operator delete (_C_usr->_C_cbarray);
                  _C_usr->_C_cbarray = 0UL; // <----- !!
              }
      

      Patch for 4.2.1 to follow shortly.

        Attachments

        1. test.cc
          0.9 kB
          Stefan Teleman
        2. stdcxx-1058.patch
          2 kB
          Stefan Teleman
        3. 27.basic_ios.copyfmt.stdcxx-1058.cpp
          3 kB
          Stefan Teleman

          Activity

            People

            • Assignee:
              farid Farid Zaripov
              Reporter:
              steleman Stefan Teleman
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              Watchers:
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              Dates

              • Created:
                Updated:
                Resolved: