What should to do with ASSERT failed

[Mike Gao <ygao.linux@xxxxxxxxx>]

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