How to solve munmap chunk invalid pointer error in C

Question

I have an application in C   and OpenCV which tries to use the classification model realized with SVMLight in order to add the weight values which can be use for HOG Calssificator under OpenCV   The problem is that when I run the application  I get this error     main Converting Model file    1 3 4 5 7 8 9 11 12 13 15 16 18 19 20 22 23 24 26 27 28 30 31 32 34 35 36 38 39 40 42 43 45 46 47 49 50 51 53 54 55 57 58 59 61 62 63 65 66 67 69 70 72 73 74 76 77 78 80 81 82 84 85 86 88 89 90 92 93 94 96 97 99 100 Skipped line     glibc detected       main  munmap chunk    invalid pointer  0x09926218             Backtrace             lib libc so 6  0x6c501  0xb6a3d501   lib libc so 6  0x6d77e  0xb6a3e77e   usr lib tls libnvidia-tls so 260 19 26  0xa20  0xb4116a20    main  ZN9  gnu cxx13new allocatorIfE10deallocateEPfj 0x11  0x804f7ab    main  ZNSt12 Vector baseIfSaIfEE13 M deallocateEPfj 0x25  0x804f075    main  ZNSt12 Vector baseIfSaIfEED2Ev 0x37  0x804e9f1    main  ZNSt6vectorIfSaIfEED1Ev 0x38  0x804e46a    main 0x804bf65   lib libc so 6   libc start main 0xe7  0xb69e7ce7    main 0x804bd11          Memory map           08048000-08052000 r-xp 00000000 08 01 27272122    home roccog HOGImplementation HOGTrainer main 08052000-08053000 r--p 00009000 08 01 27272122    home roccog HOGImplementation HOGTrainer main 08053000-08054000 rw-p 0000a000 08 01 27272122    home roccog HOGImplementation HOGTrainer main 098dd000-0994a000 rw-p 00000000 00 00 0           heap  b2387000-b238d000 rw-p 00000000 00 00 0  b238d000-b23dc000 r-xp 00000000 08 01 16386856    usr lib libXt so 6 0 0 b23dc000-b23dd000 r--p 0004e000 08 01 16386856    usr lib libXt so 6 0 0 b23dd000-b23e0000 rw-p 0004f000 08 01 16386856    usr lib libXt so 6 0 0 b23e0000-b23e1000 rw-p 00000000 00 00 0  b23e1000-b2422000 r-xp 00000000 08 01 16392261    usr lib libQtXml so 4 7 0 b2422000-b2423000 r--p 00041000 08 01 16392261    usr lib libQtXml so 4 7 0 b2423000-b2424000 rw-p 00042000 08 01 16392261    usr lib libQtXml so 4 7 0 b2424000-b243e000 r-xp 00000000 08 01 16387730    usr lib libv4lconvert so 0 b243e000-b2440000 r--p 0001a000 08 01 16387730    usr lib libv4lconvert so 0 b2440000-b2441000 rw-p 0001c000 08 01 16387730    usr lib libv4lconvert so 0 b2441000-b2491000 rw-p 00000000 00 00 0  b2491000-b2496000 r-xp 00000000 08 01 16387500    usr lib libogg so 0 7 0 b2496000-b2497000 r--p 00004000 08 01 16387500    usr lib libogg so 0 7 0 b2497000-b2498000 rw-p 00005000 08 01 16387500    usr lib libogg so 0 7 0 b2498000-b24eb000 r-xp 00000000 08 01 16387509    usr lib liborc-0 4 so 0 0 0 b24eb000-b24ec000 r--p 00052000 08 01 16387509    usr lib liborc-0 4 so 0 0 0 b24ec000-b24ef000 rw-p 00053000 08 01 16387509    usr lib liborc-0 4 so 0 0 0 b24ef000-b24f0000 rw-p 00000000 00 00 0  b24f0000-b24f4000 r-xp 00000000 08 01 16386828    usr lib libXdmcp so 6 0 0 b24f4000-b24f5000 r--p 00003000 08 01 16386828    usr lib libXdmcp so 6 0 0 b24f5000-b24f6000 rw-p 00004000 08 01 16386828    usr lib libXdmcp so 6 0 0 b24f6000-b24f8000 r-xp 00000000 08 01 16386817    usr lib libXau so 6 0 0 b24f8000-b24f9000 r--p 00001000 08 01 16386817    usr lib libXau so 6 0 0 b24f9000-b24fa000 rw-p 00002000 08 01 16386817    usr lib libXau so 6 0 0 b24fa000-b250f000 r-xp 00000000 08 01 16391993    usr lib libaudio so 2 4 b250f000-b2510000 r--p 00015000 08 01 16391993    usr lib libaudio so 2 4 b2510000-b2511000 rw-p 00016000 08 01 16391993    usr lib libaudio so 2 4 b2511000-b258a000 r-xp 00000000 08 01 16392274    usr lib libQtDBus so 4 7 0 b258a000-b258b000 r--p 00079000 08 01 16392274    usr lib libQtDBus so 4 7 0 b258b000-b258c000 rw-p 0007a000 08 01 16392274    usr lib libQtDBus so 4 7 0 b258c000-b2592000 r-xp 00000000 08 01 16387729    usr lib libv4l2 so 0 b2592000-b2593000 r--p 00005000 08 01 16387729    usr lib libv4l2 so 0 b2593000-b2597000 rw-p 00006000 08 01 16387729    usr lib libv4l2 so 0 b2597000-b2598000 rw-p 00000000 00 00 0  b2598000-b25a3000 r-xp 00000000 08 01 4456631     lib libusb-1 0 so 0 0 0 b25a3000-b25a4000 r--p 0000a000 08 01 4456631     lib libusb-1 0 so 0 0 0 b25a4000-b25a5000 rw-p 0000b000 08 01 4456631     lib libusb-1 0 so 0 0 0 b25a5000-b2630000 r-xp 00000000 08 01 16392999    usr lib libvpx so 0 9 5 b2630000-b2631000 r--p 0008b000 08 01 16392999    usr lib libvpx so 0 9 5 b2631000-b2632000 rw-p 0008c000 08 01 16392999    usr lib libvpx so 0 9 5 b2632000-b263c000 rw-p 00000000 00 00 0  b263c000-b2662000 r-xp 00000000 08 01 16387736    usr lib libvorbis so 0 4 4 b2662000-b2663000 r--p 00025000 08 01 16387736    usr lib libvorbis so 0 4 4 b2663000-b2664000 rw-p 00026000 08 01 16387736    usr lib libvorbis so 0 4 4 b2664000-b27c9000 r-xp 00000000 08 01 16387738    usr lib libvorbisenc so 2 0 7 b27c9000-b27ca000 ---p 00165000 08 01 16387738    usr lib libvorbisenc so 2 0 7 b27ca000-b27db000 r--p 00165000 08 01 16387738    usr lib libvorbisenc so 2 0 7 b27db000-b27dc000 rw-p 00176000 08 01 16387738    usr lib libvorbisenc so 2 0 7 b27dc000-b27f4000 r-xp 00000000 08 01 16387697    usr lib libtheoradec so 1 1 4 b27f4000-b27f5000 r--p 00017000 08 01 16387697    usr lib libtheoradec so 1 1 4 b27f5000-b27f6000 rw-p 00018000 08 01 16387697    usr lib libtheoradec so 1 1 4 b27f6000-b27f7000 rw-p 00000000 00 00 0  b27f7000-b2839000 r-xp 00000000 08 01 16387699    usr lib libtheoraenc so 1 1 2 b2839000-b283a000 r--p 00041000 08 01 16387699    usr lib libtheoraenc so 1 1 2 b283a000-b283b000 rw-p 00042000 08 01 16387699    usr lib libtheoraenc so 1 1 2 b283b000-b2856000 r-xp 00000000 08 01 16392180    usr lib sse2 libspeex so 1 5 0 b2856000-b2857000 r--p 0001a000 08 01 16392180    usr lib sse2 libspeex so 1 5 0 b2857000-b2858000 rw-p 0001b000 08 01 16392180    usr lib sse2 libspeex so 1 5 0 b2858000-b28f5000 r-xp 00000000 08 01 16392994    usr lib libschroedinger-1 0 so 0 3 0 b28f5000-b28f6000 ---p 0009d000 08 01 16392994    usr lib libschroedinger-1 0 so 0 3 0 b28f6000-b28f7000 r--p 0009d000 08 01 16392994    usr lib libschroedinger-1 0 so 0 3 0 b28f7000-b28f8000 rw-p 0009e000 08 01 16392994    usr lib libschroedinger-1 0 so 0 3 0 b28f8000-b28f9000 rw-p 00000000 00 00 0  b28f9000-b2905000 r-xp 00000000 08 01 16392992    usr lib libgsm so 1 0 12 b2905000-b2906000 r--p 0000b000 08 01 16392992    usr lib libgsm so 1 0 12 b2906000-b2907000 rw-p 0000c000 08 01 16392992    usr lib libgsm so 1 0 12 b2907000-b290c000 r-xp 00000000 08 01 16392996    usr lib libva so 1 0 1 b290c000-b290d000 r--p 00004000 08 01 16392996    usr lib libva so 1 0 1 b290d000-b290e000 rw-p 00005000 08 01 16392996    usr lib libva so 1 0 1 b290e000-b290f000 rw-p 00000000 00 00 0  b290f000-b2933000 r-xp 00000000 08 01 4456520     lib libexpat so 1 5 2 b2933000-b2935000 r--p 00024000 08 01 4456520     lib libexpat so 1 5 2 b2935000-b2936000 rw-p 00026000 08 01 4456520     lib libexpat so 1 5 2 b2936000-b293c000 r-xp 00000000 08 01 16387775    usr lib libxcb-render so 0 0 0 b293c000-b293d000 r--p 00005000 08 01 16387775    usr lib libxcb-render so 0 0 0 b293d000-b293e000 rw-p 00006000 08 01 16387775    usr lib libxcb-render so 0 0 0 b293e000-b2940000 r-xp 00000000 08 01 16387777    usr lib libxcb-shm so 0 0 0 b2940000-b2941000 r--p 00001000 08 01 16387777    usr lib libxcb-shm so 0 0 0 b2941000-b2942000 rw-p 00002000 08 01 16387777    usr lib libxcb-shm so 0 0 0 b2942000-b299e000 r-xp 00000000 08 01 16387543    usr lib libpixman-1 so 0 18 4Aborted   It s strange because it successfully creates the file which I need  but it gives this error anyway   This is the code which I use   vector lt float gt  test  loadSVMfromModelFile  model    amp test      model is the file create with SVM Light   loads a file from SVMlight and converts the loaded support vectors to the weight vector  void loadSVMfromModelFile const char  filename  vector lt float gt   svm       ifstream svinstr  filename       string line      float d g s r  b      int maxidx numtrain numsvm  type          int cur svidx   0      getline svinstr  line           line clear        svinstr  gt  gt  type      if  type    0           cout  lt  lt   Error  Only linear SVM supported   lt  lt  endl          return            getline svinstr  line       svinstr  gt  gt  d          Kernel parameter d        line clear        getline svinstr  line       svinstr  gt  gt g          line clear        getline svinstr  line       svinstr  gt  gt  s          line clear        getline svinstr  line       svinstr  gt  gt  r          line clear        getline svinstr  line            line clear        getline svinstr  line       svinstr  gt  gt  maxidx     highest feature idx          line clear        getline svinstr  line       svinstr  gt  gt  numtrain       num of training vecs          line clear        getline svinstr  line       svinstr  gt  gt  numsvm     num of support vecs      line clear        getline svinstr  line       svinstr  gt  gt  b          offset b       line clear        getline svinstr  line        line clear        svm- gt clear        svm- gt resize maxidx 1  0         svm  maxidx    -b      while  svinstr eof                  cur svidx            if  cur svidx 20   0                        cout  lt  lt  cvRound  double cur svidx  double numsvm 100   lt  lt                   flush cout                     getline svinstr  line           if  line size    lt  5               cout  lt  lt   Skipped line   lt  lt  endl              continue                    istringstream strstream line           float ftemp          int itemp          double alpha          strstream  gt  gt  alpha          int lastitemp   -1          while   strstream eof                  strstream  gt  gt  itemp              if  itemp    lastitemp                   break                            lastitemp   itemp              char x              strstream  gt  gt  x              strstream  gt  gt ftemp                svm  itemp-1     alpha   ftemp                    svinstr sync               Can you help me to improve this utility and remove this weird error  please   EDIT  This is what valgrind outputs me   valgrind --leak-check yes   main   27668   Memcheck  a memory error detector   27668   Copyright  C  2002-2010  and GNU GPL d  by Julian Seward et al    27668   Using Valgrind-3 6 0 SVN-Debian and LibVEX  rerun with -h for copyright info   27668   Command    main   27668    Converting Model file      27668   Invalid read of size 4   27668      at 0x804C6A6  loadSVMfromModelFile char const   std  vector lt float  std  allocator lt float gt   gt     main cpp 182    27668      by 0x804BF44  main  main cpp 67    27668    Address 0x9f38844 is 4 bytes before a block of size 15 124 alloc d   27668      at 0x4026351  operator new unsigned int   vg replace malloc c 255    27668      by 0x804F8C5    gnu cxx  new allocator lt float gt   allocate unsigned int  void const    new allocator h 89    27668      by 0x804F627  std   Vector base lt float  std  allocator lt float gt   gt    M allocate unsigned int   in  home roccog HOGImplementation HOGTrainer main    27668      by 0x804F2ED  std  vector lt float  std  allocator lt float gt   gt    M fill insert   gnu cxx    normal iterator lt float   std  vector lt float  std  allocator lt float gt   gt   gt   unsigned int  float const amp    vector tcc 414    27668      by 0x804EABD  std  vector lt float  std  allocator lt float gt   gt   insert   gnu cxx    normal iterator lt float   std  vector lt float  std  allocator lt float gt   gt   gt   unsigned int  float const amp    stl vector h 859    27668      by 0x804E54F  std  vector lt float  std  allocator lt float gt   gt   resize unsigned int  float   stl vector h 558    27668      by 0x804C4D5  loadSVMfromModelFile char const   std  vector lt float  std  allocator lt float gt   gt     main cpp 152    27668      by 0x804BF44  main  main cpp 67    27668      27668   Invalid write of size 4   27668      at 0x804C6C4  loadSVMfromModelFile char const   std  vector lt float  std  allocator lt float gt   gt     main cpp 182    27668      by 0x804BF44  main  main cpp 67    27668    Address 0x9f38844 is 4 bytes before a block of size 15 124 alloc d   27668      at 0x4026351  operator new unsigned int   vg replace malloc c 255    27668      by 0x804F8C5    gnu cxx  new allocator lt float gt   allocate unsigned int  void const    new allocator h 89    27668      by 0x804F627  std   Vector base lt float  std  allocator lt float gt   gt    M allocate unsigned int   in  home roccog HOGImplementation HOGTrainer main    27668      by 0x804F2ED  std  vector lt float  std  allocator lt float gt   gt    M fill insert   gnu cxx    normal iterator lt float   std  vector lt float  std  allocator lt float gt   gt   gt   unsigned int  float const amp    vector tcc 414    27668      by 0x804EABD  std  vector lt float  std  allocator lt float gt   gt   insert   gnu cxx    normal iterator lt float   std  vector lt float  std  allocator lt float gt   gt   gt   unsigned int  float const amp    stl vector h 859    27668      by 0x804E54F  std  vector lt float  std  allocator lt float gt   gt   resize unsigned int  float   stl vector h 558    27668      by 0x804C4D5  loadSVMfromModelFile char const   std  vector lt float  std  allocator lt float gt   gt     main cpp 152    27668      by 0x804BF44  main  main cpp 67    27668    1 3 4 5 7 8 9 11 12 13 15 16 18 19 20 22 23 24 26 27 28 30 31 32 34 35 36 38 39 40 42 43 45 46 47 49 50 51 53 54 55 57 58 59 61 62 63 65 66 67 69 70 72 73 74 76 77 78 80 81 82 84 85 86 88 89 90 92 93 94 96 97 99 100 Skipped line   EDIT 2  As valgrind outputs     27668   Invalid read of size 4   27668      at 0x804C6A6  loadSVMfromModelFile char const   std  vector lt float  std  allocator lt float gt   gt     main cpp 182    27668      by 0x804BF44  main  main cpp 67    line 182    svm  itemp-1     alpha   ftemp   Then     27668      by 0x804BF44  main  main cpp 67    27668    Address 0x9f38844 is 4 bytes before a block of size 15 124 alloc d   27668      at 0x4026351  operator new unsigned int   vg replace malloc c 255    27668      by 0x804F8C5    gnu cxx  new allocator lt float gt   allocate unsigned int  void const    new allocator h 89    line 67   vector lt float gt  test  loadSVMfromModelFile  model    amp test

User · Answer

The hint is  the output file is created even if you get this error  The automatic deconstruction of vector starts after your code executed  Elements in the vector are deconstructed as well  This is most probably where the error occurs  The way you access the vector is through vector  operator   with an index read from stream  Try vector  at   instead of vector  operator    This won t solve your problem  but will show which assignment to the vector causes error

User · Answer

This happens when the pointer passed to free   is not valid or has been modified somehow  I don t really know the details here  The bottom line is that the pointer passed to free   must be the same as returned by malloc    realloc   and their friends  It s not always easy to spot what the problem is for a novice in their own code or even deeper in a library  In my case  it was a simple case of an undefined  uninitialized  pointer related to branching       The free   function frees the memory space pointed  to  by  ptr   which          must  have  been  returned  by a previous call to malloc    calloc   or          realloc     Otherwise  or if free ptr  has already been called  before           undefined behavior occurs   If ptr is NULL  no operation is performed        GNU                               2012-05-10                         MALLOC 3    char  words     setting this to NULL would have prevented the issue  if  condition        words   malloc  512            calling free sometime later works here         free words    else           do not allocate words in this branch          free words    -- error here --     glibc detected       bin  munmap chunk    invalid pointer  0xb                There are many similar questions here about the related free   and rellocate   functions  Some notable answers providing more details       glibc detected     free    invalid next size  normal   0x0a03c978         glibc detected     sendip  free    invalid next size  normal   0x09da25e8      glibc detected  realloc    invalid pointer    IMHO running everything in a debugger  Valgrind  is not the best option because errors like this are often caused by inept or novice programmers  It s more productive to figure out the issue manually and learn how to avoid it in the future

[c++] How to solve munmap_chunk(): invalid pointer error in C++

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