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# 1  
Old 01-24-2010
Java id3lib SEGFAULT

Hello everyone,
I'm writing a program using the id3lib unfortunately I've encountered with memory issue that cause segmentation fault. I tried to rerun and analyze the program with valgrind but it doesn't point me anywhere. I really stuck on this one.

Valgrind output:
==14716== Invalid read of size 4

==14716==    at 0x404BEFC: ID3_Frame::GetField(ID3_FieldID) const (in /usr/lib/

==14716==    by 0x8049BD0: Parse_mask(char const*, char const*, ID3_TagType) (in /home/earlcash/dev/id3fcp/id3fcp)

==14716==    by 0x804967D: main (in /home/earlcash/dev/id3fcp/id3fcp)

==14716==  Address 0x4 is not stack'd, malloc'd or (recently) free'd


==14716== Process terminating with default action of signal 11 (SIGSEGV)

==14716==  Access not within mapped region at address 0x4

==14716==    at 0x404BEFC: ID3_Frame::GetField(ID3_FieldID) const (in /usr/lib/

==14716==    by 0x8049BD0: Parse_mask(char const*, char const*, ID3_TagType) (in /home/earlcash/dev/id3fcp/id3fcp)

==14716==    by 0x804967D: main (in /home/earlcash/dev/id3fcp/id3fcp)


==14716== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 21 from 1)

==14716== malloc/free: in use at exit: 775 bytes in 6 blocks.

==14716== malloc/free: 16 allocs, 10 frees, 9,487 bytes allocated.

==14716== For counts of detected errors, rerun with: -v

==14716== searching for pointers to 6 not-freed blocks.

==14716== checked 130,888 bytes.

'Parse_mask' definition:
const char *Parse_mask(const char *filename, const char *mask, ID3_TagType id3_ver){
    p_symbols event[] =
        { "%n", ID3FID_TRACKNUM },
        { "%i", ID3FID_ORIGARTIST },
        { "%t", ID3FID_TITLE },
        { "%a", ID3FID_ALBUM },
    //    { "%g", ID3FID_ },
        { "%y", ID3FID_ORIGYEAR },
    //    { "%c",  },
        { NULL, ID3FID_NOFRAME }
    string s_mask = mask;
    ID3_Tag file;
    /*ID3_Frame *f_frame = NULL;
    ID3_Field *f_field = NULL;*/
    char tag_buff[255];
    int iter = 0;
    size_t match;

    if(file.Link(filename, id3_ver) == 0){
        return NULL;    
    while(event[iter].symbol != NULL){
        if((match = s_mask.find(event[iter].symbol)) != string::npos){
            file.Find(event[iter].frame_id)->GetField(ID3FN_TEXT)->Get(tag_buff, 255);
            s_mask.replace(match, strlen(event[iter].symbol), tag_buff);

    s_mask += ".mp3";
    return s_mask.c_str();

Thanks in advance Smilie
# 2  
Old 01-25-2010
Try compiling with -ggdb and running with the gdb command. When it crashes inside gdb, you can run 'bt f' to see what line it segfaults at.
# 3  
Old 01-25-2010
Accordingly to the valgrind output, the problem seems to occur during the execution of the GetField method. Now it's almost impossible to help you further, given your current problem description.


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Test Your Knowledge in Computers #576
Difficulty: Medium
All programming languages have automatic garbage collection that monitors the dynamically allocated pieces of memory and determine if any variable in the program still references it. If the memory is no longer referenced, it is 'garbage' and becomes eligible to be 'collected'.
True or False?

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