If there's no hung task listed in dmesg you could try to do sysrq+t to find out what everything's up to, although then you have to learn how to parse the result.
Chris Murphy -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
