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    SubjectRe: Kernel BUG at fs/mpage.c:489
    On Wed, 13 Feb 2008 08:26:27 +0100 Bart Dopheide <dopheide@fmf.nl> wrote:

    > On Wed, Feb 13, 2008 at 12:05:45PM +1100, Nick Piggin wrote:
    > :)On Wednesday 13 February 2008 08:50, Alan Cox wrote:
    > :)> Almost certainly a hardware fail of some sort.
    > :)
    > :)Right, but the kernel shouldn't go bug...
    >
    > Indeed, that's why I'm reporting.
    >
    >
    > :)I don't have a copy of your exact source code... which condition in
    > :)__mpage_writepage went BUG?
    >
    > BUG_ON(buffer_locked(bh));
    >
    > In a bit of context:
    > 482: if (page_has_buffers(page)) {
    > 483: struct buffer_head *head = page_buffers(page);
    > 484: struct buffer_head *bh = head;
    > 485:
    > 486: /* If they're all mapped and dirty, do it */
    > 487: page_block = 0;
    > 488: do {
    > 489: BUG_ON(buffer_locked(bh));
    > 490: if (!buffer_mapped(bh)) {
    > 491: /*
    > 492: * unmapped dirty buffers are created by
    > 493: * __set_page_dirty_buffers -> mmapped data
    > 494: */
    > 495: if (buffer_dirty(bh))
    > 496: goto confused;
    > 497: if (first_unmapped == blocks_per_page)
    > 498: first_unmapped = page_block;
    > 499: continue;
    > 500: }
    >

    Probably means that either fat, IDE, block or fs/buffer.c failed to unlock a buffer_head
    when the IO error happened. It's unlikely to be fat.



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