Messages in this thread | | | Date | Wed, 13 Feb 2008 01:01:45 -0800 | From | Andrew Morton <> | Subject | Re: Kernel BUG at fs/mpage.c:489 |
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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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