I've been getting blocked tasks on 3.15.1 generally at times when the filesystem is somewhat busy (such as doing a backup via scp/clonezilla writing to the disk). A week ago I had enabled snapper for a day which resulted in a daily cleanup of about 8 snapshots at once, which might have contributed, but I've been limping along since. Here is a pastebin of my dmesg from the hung tasks and a subsequent Alt-SysRq-W: http://pastebin.com/yYdcxFTE When this happens the system remains somewhat stable, but no writes to the disk succeed, and I start getting load averages in the dozens as tasks start blocking. On reboot the system generally works fine, though it can hang a day or two later. I'm happy to try patches, or try to capture any other output that is helpful the next time this happens - the system is fairly stable as long as I capture things someplace other than my btrfs file systems. I didn't see anything quite like this on the list. I updated my kernel around the time this behavior started, and was on 3.15.0 previously (though I haven't tried reverting yet). Rich -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html