FYI, I just saw this:
Nov 5 17:09:10 enterprise kernel: buffer layer error at fs/buffer.c:1623
Nov 5 17:09:10 enterprise kernel: Pass this trace through ksymoops for reporting
Nov 5 17:09:10 enterprise kernel: Call Trace: [__buffer_error+51/64] [__block_write_full_page+127/880] [block_write_full_page+45/160] [blkdev_get_block+0/80] [blkdev_writepage+15/32] [blkdev_get_block+0/80] [mpage_writepages+478/816] [blkdev_writepage+0/32] [__set_page_dirty_buffers+205/224] [try_to_unmap_one+198/256] [generic_writepages+17/21] [do_writepages+24/48] [generic_vm_writeback+50/64] [shrink_list+564/960] [__pagevec_release+21/32] [__pagevec_lru_add_active+131/144] [__pagevec_release+21/32] [shrink_cache+333/560] [shrink_zone+108/128] [balance_pgdat+155/256] [kswapd+257/267] [kswapd+0/267] [autoremove_wake_function+0/64] [autoremove_wake_function+0/64] [kernel_thread_helper+5/16]
Mike.