What should to do with ASSERT failed

[Mike Gao]

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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