[Solved] where is the pthread segfault happening?

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  1. You use of strtok() is wrong:

    line = strtok(buffer, NULL);

    should be 

    line = strtok(NULL, delim);

    Another mistakes should be fixed similarly.

  2. The elements of text_lines are uninitialized:

    text_lines = malloc(6000 * sizeof(char*));

    this allocated 6000 pointers to char, but none of these pointers are initialized.

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solved where is the pthread segfault happening?