Comment # 2 on bug 910336 from Martin Pluskal

(In reply to Jan Kara from comment #1)
> The culprit here is the message:
> [  +0.083015] XFS (md0): Unknown buffer type 0!
> 
> Meaning that the journal contained buffer of type 0 which is invalid.
> Because of that we didn't attach any operations to the buffer and later
> _xfs_buf_ioapply() complained.
> 
> Is this reproducible? What does 'xfs_repair -n /dev/md0' say?

I have not seen this issue after, it occurred after unclean unmount of
filesystem (reset of machine), nevertheless after printing this message fs was
mounted and booting continued, so I assume that xfs_repair would not say us
anything now