Possible bug when constructing a string from an array of characters about julia HOT 4 CLOSED

I don't think any of those fields exist anymore. Are you sure you are looking at master and not an older release?

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Ah sorry, that's on our fork of Julia, which is a patched 1.10 (will edit the comment above to provide a clarification on that).

But yes, the issue reproduces on stock 1.10.

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one thing worth checking. does the actual memory use increase or is it just a live_bytes reporting issue?

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RSS stays the same, just live_bytes increases. This makes sense if you take a look at jl_gc_free_array:

static void jl_gc_free_array(jl_array_t *a) JL_NOTSAFEPOINT
{
    if (a->flags.how == 2) {
        char *d = (char*)a->data - a->offset*a->elsize;
        if (a->flags.isaligned)
            jl_free_aligned(d);
        else
            free(d);
        gc_num.freed += jl_array_nbytes(a);
        gc_num.freecall++;
    }
}

The fact that the length is zero-ed out here won't change the fact that free still runs. Just the increment to gc_num.freed that's wrong.

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