On Fri, Oct 06, 2017 at 12:25:17PM +0200, Nick Gilmour wrote: > Hi all, > > I have converted .vdi disk (BTRFS) into a .img disk, resized it from > 500GB to 150GB and then copied into a ZFS Volume. I've imported the VM > into VMM and it started normally but an upgrade failed. I've rebooted > and got only a blue screen something like a BSOD on Windows. I've > changed into a terminal and now this error appears constantly: > > "BTRFS error (device vda1): couldn't get super buffer head for bytenr x"
The error implies that it failed to read the sectors which contains btrfs superblock, given you've shrinked the size, I guess btrfs doesn't know that somehow and is trying to issue writes to a >150GB position(could be 256G). You can check that 'bytenr x'. Which command did you use to resize it? thanks, -liubo > > I can stop it shortly with Ctrl-C and enter a command. With startx I > can see my desktop in blue color with some icons in it and nothing > more. > > > uname -a > Linux VM-Ubuntu 4.4.0-83-generic > > btrfs --version > btrfs-progs v4.4 > > btrfs fi show > Label: none uuid: x > Total devices 1 FS bytes used 473.68GiB > devid 1 size 492.00 GiB used 492.00GiB path /dev/sda1 > > Label: 'extra' uuid: y > Total devices 1 FS bytes used 112.00KiB > devid 1 size 100.00 GiB used 2.02GiB path /dev/sdb1 > > btrfs fi df /home > Data, single: total=106.40GiB, used=96.42GiB > System, DUP: total=8.00MiB, used=48.00KiB > Metadata, DUP: total=14.88GiB, used=11.18GiB > GlobalReserve, single: total=512.00 MiB, used=0.00B > > dmesg > dmesg.log > compiz: segfault at ... error 4 in libnux-graphics-4.0.so... > > > Any ideas? > > Regards, > Nick > -- > 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 -- 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
