Hi Josef, Chris, When testing BTRFS with RAID 0 metadata on linux-3.4-rc1, we see discard ranges exceeding the end of the block device [1], potentially causing dataloss; when this occurs, filesystem writeback becomes catatonic due to continual resubmission. Simply mounting with discard a raid0 metadata filesystem and copying some data in [2] provokes the issue. Thanks, Daniel --- [1] attempt to access beyond end of device ram0: rw=129, want=8452072, limit=4096000 ... --- [2] modprobe brd rd_size=2048000 (or boot with ramdisk_size=2048000) mkfs.btrfs -m raid0 /dev/ram0 /dev/ram1 mount /dev/ram0 /mnt -o discard cd /mnt && tar -xvzf linux.tar.gz <access beyond end of device and livelock> -- Daniel J Blueman -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
