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What should to do with ASSERT failed

To: xfs@xxxxxxxxxxx
Subject: What should to do with ASSERT failed
From: Mike Gao <ygao.linux@xxxxxxxxx>
Date: Mon, 30 Aug 2010 15:55:02 -0500
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xfs_vm_writepage
{
               /*
* A hole may still be marked uptodate because discard_buffer
* leaves the flag set.
*/
if (!buffer_mapped(bh) && buffer_uptodate(bh)) {
ASSERT(!buffer_dirty(bh));
imap_valid = 0;
continue;
}
}

I met this case that buffer is marked as dirty which make assert failed. 
What does this mean and what I can do with it?

Thanks very much,
Mike
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