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    SubjectRe: 2.6.25-git2: BUG: unable to handle kernel paging request at ffffffffffffffff
    Linus Torvalds wrote:
    > Looks like possibly a double free to me (with the first free caused the
    > page to be re-used, the second free is the one that triggers the debug
    > message). But maybe Pekka or Christoph are better at reading those oopses.
    >> =============================================================================
    >> BUG kmalloc-4096: Padding overwritten. 0x0000000000000000-0x00000000ffffffff
    >> -----------------------------------------------------------------------------

    Okay, this doesn't make sense to me. The code does:

    u8 *start;
    u8 *fault;

    /* ... */

    start = page_address(page);

    /* ... */

    fault = check_bytes(start + length, POISON_INUSE, remainder);
    if (!fault)
    return 1;
    while (end > fault && end[-1] == POISON_INUSE)

    slab_err(s, page, "Padding overwritten. 0x%p-0x%p", fault, end - 1);

    So how come we're printing out 'fault' as zero and 'end' at 4 GB? Christoph?

    Zdenek, can you please send the full dmesg?


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