dma_timer_expiry
hda: dma_timer_expiry :dma status == 0x21 エラーで固まります。
http://www.aconus.com/~oyaji/bbs/past/0004/B0002457.html
Re: [linux-lvm] dma_timer_expiry and pvmove problem
It looks like a bad disk.
https://www.redhat.com/archives/linux-lvm/2003-November/msg00043.html