Strange memory allocation bug

[torii]

Hello all!
I am experiencing a strange bug when using the liballoc implementation of malloc.
When first accessing allocated memory, the next write to memory seems to be ignored completely, leaving the memory uninitialised. I have added some example screenshots below:

Code: Select all

    int *n = malloc(sizeof(int));

    *n = 10;
    char buf[10] = {0};
    utos(*n, 10, buf);
    fputs(1, buf);
    fputs(1, "\n");

    *n = 12;
    utos(*n, 10, buf);
    fputs(1, buf);

malloc bug 2.png (452 Bytes) Viewed 158 times

By moving the declaration of `buf` before assigning to *n:

Code: Select all

    int *n = malloc(sizeof(int));
    char buf[10] = {0};

    *n = 10;
    utos(*n, 10, buf);
    fputs(1, buf);
    fputs(1, "\n");

    *n = 12;
    utos(*n, 10, buf);
    fputs(1, buf);

malloc bug 3.png (351 Bytes) Viewed 158 times

Edit: forgot to upload the github link https://github.com/Toriiiiiiiiii/Solkern

[Octocontrabass]

Have you tried disassembling this function? I suspect your code isn't doing what you think it's doing. I'm especially interested in the parameters being passed to utos().