SIGABRT on simple malloc

This is a discussion on SIGABRT on simple malloc within the C Programming forums, part of the General Programming Boards category; Hi, I'm implementing the boyer moore algorithm and have had quite a lot of trouble with it so far. Firstly ...

  1. #1
    KVH
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    SIGABRT on simple malloc

    Hi,
    I'm implementing the boyer moore algorithm and have had quite a lot of trouble with it so far. Firstly I had invalid reads, but those seem to be gone now. Now I'm getting a SIGABRT. which seems to be on the rule:
    'occ = (int*) malloc(256*sizeof(int));'
    part of the code:
    Code:
    int charsread, doubles, cursor, results, tlength,i;
    	char * t;
    	int *occ, *s;
    
    
    	FILE* file = fopen(fname, "rb");
            if (file == NULL) {
    			printf("%s\n", "Unable to open file");
    			return -1;
    		}
    	tlength = zlength * TSIZE;
    	results = 0;
    	cursor = 1;
    	charsread =0;
    		
            t = (char*) malloc(tlength * sizeof(char));
            if(t == NULL){
                    printf("%s\n", "Memory error");
                    return -1;
            }
    	
            
            s = (int*) malloc(zlength+1*sizeof(int));
            //alles 0 initialiseren
    	for(i =0;i<zlength+1; i++){
    		s[i] = 0;
    	}
            occ = (int*) malloc(256*sizeof(int));
            for(i = 0; i<256;i++){
    		occ[i] =-1;
    	}
    gdb gives:


    Breakpoint 1, processfile (fname=0x7fffffffe57c "search3/t.txt", z=0x603250 "needle", zlength=6) at search3/search3.c:117
    117 occ = (int*) malloc(256*sizeof(int));
    (gdb) s
    *__GI___libc_malloc (bytes=1024) at malloc.c:3615
    3615 malloc.c: No such file or directory.
    in malloc.c
    (gdb)
    When I let it run normally in gdb:

    Starting program: /home/kv/Dropbox/Ugent/Algoritmen en Datastructuren III/a.out search3/z.txt search3/t.txt
    a.out: malloc.c:3096: sYSMALLOc: Assertion `(old_top == (((mbinptr) (((char *) &((av)->bins[((1) - 1) * 2])) - __builtin_offsetof (struct malloc_chunk, fd)))) && old_size == 0) || ((unsigned long) (old_size) >= (unsigned long)
    ((((__builtin_offsetof (struct malloc_chunk, fd_nextsize))+((2 * (sizeof(size_t))) - 1)) & ~((2 * (sizeof(size_t))) - 1))) && ((old_top)->size & 0x1) && ((unsigned long)old_end & pagemask) == 0)' failed.

    Program received signal SIGABRT, Aborted.
    0x00007ffff7a8cba5 in *__GI_raise (sig=<value optimized out>) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
    64 ../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.
    in ../nptl/sysdeps/unix/sysv/linux/raise.c

    Now, I really have no Idea what the problem could be now... Valgrind does not detect any problems it seems (?):
    ==5672== Memcheck, a memory error detector
    ==5672== Copyright (C) 2002-2010, and GNU GPL'd, by Julian Seward et al.
    ==5672== Using Valgrind-3.6.0.SVN-Debian and LibVEX; rerun with -h for copyright info
    ==5672== Command: ./a.out search3/z.txt /search3/t.txt
    ==5672==
    --5672-- Valgrind options:
    --5672-- --suppressions=/usr/lib/valgrind/debian-libc6-dbg.supp
    --5672-- --leak-check=full
    --5672-- -v
    --5672-- --tool=memcheck
    --5672-- Contents of /proc/version:
    --5672-- Linux version 2.6.35-22-generic (buildd@yellow) (gcc version 4.4.5 (Ubuntu/Linaro 4.4.4-14ubuntu5) ) #35-Ubuntu SMP Sat Oct 16 20:45:36 UTC 2010
    --5672-- Arch and hwcaps: AMD64, amd64-sse3-cx16
    --5672-- Page sizes: currently 4096, max supported 4096
    --5672-- Valgrind library directory: /usr/lib/valgrind
    --5672-- Reading syms from /home/kv/Dropbox/Ugent/Algoritmen en Datastructuren III/a.out (0x400000)
    --5672-- Reading syms from /lib/ld-2.12.1.so (0x4000000)
    --5672-- Considering /lib/ld-2.12.1.so ..
    --5672-- .. CRC mismatch (computed 7a804908 wanted b62d6d8e)
    --5672-- Considering /usr/lib/debug/lib/ld-2.12.1.so ..
    --5672-- .. CRC is valid
    --5672-- Reading syms from /usr/lib/valgrind/memcheck-amd64-linux (0x38000000)
    --5672-- object doesn't have a dynamic symbol table
    --5672-- Reading suppressions file: /usr/lib/valgrind/debian-libc6-dbg.supp
    --5672-- Reading suppressions file: /usr/lib/valgrind/default.supp
    --5672-- REDIR: 0x4018620 (strlen) redirected to 0x3803ee1f (vgPlain_amd64_linux_REDIR_FOR_strlen)
    --5672-- Reading syms from /usr/lib/valgrind/vgpreload_core-amd64-linux.so (0x4a23000)
    --5672-- Reading syms from /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so (0x4c25000)
    ==5672== WARNING: new redirection conflicts with existing -- ignoring it
    --5672-- new: 0x04018620 (strlen ) R-> 0x04c292cf strlen
    --5672-- REDIR: 0x4018490 (index) redirected to 0x4c28f71 (index)
    --5672-- REDIR: 0x4018510 (strcmp) redirected to 0x4c2979b (strcmp)
    --5672-- Reading syms from /lib/libc-2.12.1.so (0x4e2e000)
    --5672-- Considering /lib/libc-2.12.1.so ..
    --5672-- .. CRC mismatch (computed cc0d5ab1 wanted 70d47059)
    --5672-- Considering /usr/lib/debug/lib/libc-2.12.1.so ..
    --5672-- .. CRC is valid
    --5672-- REDIR: 0x4eb2900 (__GI_strrchr) redirected to 0x4c28dde (__GI_strrchr)
    --5672-- REDIR: 0x4eaa320 (malloc) redirected to 0x4c280da (malloc)
    --5672-- REDIR: 0x4eb4a90 (memcpy) redirected to 0x4c2985d (memcpy)
    --5672-- REDIR: 0x4eabc10 (free) redirected to 0x4c27cea (free)
    --5672-- REDIR: 0x4eb0e40 (__GI_strlen) redirected to 0x4c2929b (__GI_strlen)
    Unable to open file
    --5672-- REDIR: 0x4eb6050 (strchrnul) redirected to 0x4c2a441 (strchrnul)
    --5672-- REDIR: 0x4eb41b0 (mempcpy) redirected to 0x4c2a4b2 (mempcpy)
    Total matches found: -1.
    ==5672==
    ==5672== HEAP SUMMARY:
    ==5672== in use at exit: 0 bytes in 0 blocks
    ==5672== total heap usage: 3 allocs, 3 frees, 1,142 bytes allocated
    ==5672==
    ==5672== All heap blocks were freed -- no leaks are possible
    ==5672==
    ==5672== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 4 from 4)
    --5672--
    --5672-- used_suppression: 2 dl-hack3-cond-1
    --5672-- used_suppression: 2 glibc-2.5.x-on-SUSE-10.2-(PPC)-2a
    ==5672==
    ==5672== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 4 from 4)
    Google didn't give any interesting results so far... does anyone have an idea what this could be?

  2. #2
    Jack of many languages Dino's Avatar
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    Try this an see what happens:
    Code:
    s = (int*) malloc((zlength+1)*sizeof(int));
    Mac and Windows cross platform programmer. Ruby lover.

    Quote of the Day
    12/20: Mario F.:I never was, am not, and never will be, one to shut up in the face of something I think is fundamentally wrong.

    Amen brother!

  3. #3
    KVH
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    EDIT: thanks dino. Stupid mistake.

  4. #4
    Jack of many languages Dino's Avatar
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    That's usually what it means. Are you freeing it as you go?
    Mac and Windows cross platform programmer. Ruby lover.

    Quote of the Day
    12/20: Mario F.:I never was, am not, and never will be, one to shut up in the face of something I think is fundamentally wrong.

    Amen brother!

  5. #5
    KVH
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    Yes.
    Everything is fine now. thanks a lot.
    Solved

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