On Sun, May 05, 2013 at 04:25:45AM -0600, Kai Krakow wrote:
> Hello list,
>
> I've upgraded to 3.9.0 mainly for the snapshot-aware defragging patches. I'm
> running bedup[1] on a regular basis and it is now the third time that I got
> back to my PC just to find it hard-frozen and I needed to use the reset
> button.
>
> It looks like this happens only while running bedup on my two btrfs
> filesystems but I'm not sure if it happens for any of the filesystems or
> only one. This is my setup:
>
> # cat /etc/fstab (shortened)
> UUID=d2bb232a-2e8f-4951-8bcc-97e237f1b536 / btrfs compress=lzo,subvol=root64
> 0 1 # /dev/sd{a,b,c}3
> LABEL=usb-backup /mnt/private/usb-backup btrfs noauto,compress-
> force=zlib,subvolid=0,autodefrag,comment=systemd.automount 0 0 # external
> usb3 disk
>
> # btrfs filesystem show
> Label: 'usb-backup' uuid: 7038c8fa-4293-49e9-b493-a9c46e5663ca
> Total devices 1 FS bytes used 1.13TB
> devid 1 size 1.82TB used 1.75TB path /dev/sdd1
>
> Label: 'system' uuid: d2bb232a-2e8f-4951-8bcc-97e237f1b536
> Total devices 3 FS bytes used 914.43GB
> devid 3 size 927.26GB used 426.03GB path /dev/sdc3
> devid 2 size 927.26GB used 426.03GB path /dev/sdb3
> devid 1 size 927.26GB used 427.07GB path /dev/sda3
>
> Btrfs v0.20-rc1
>
> Since the system hard-freezes I have no messages from dmesg. But I suspect
> it to be related to the defragmentation option in bedup (I've switched to
> bedub with --defrag since 3.9.0, and autodefrag for the backup drive). Just
> in case, I'm going to try without this option now and see if it won't
> freeze.
>
> I was able to take a "physical" screenshot with a real camera of a kernel
> backtrace one time when the freeze happened. I wonder if it is useful to you
> and where to send it. I just don't want to upload jpegs right here to the
> list without asking first.
>
> The big plus is: Altough I had to hard-reset the frozen system several times
> now, btrfs survived the procedure without any impact (just boot times
> increases noticeably, probably due to log-replays or something). So thumbs
> up for the developers on that point.
>
> [1]: https://github.com/g2p/bedup
>
Can you please file a bug for this issue on bugzilla.kernel.org so I can make
sure we don't lose track of it? Make sure the component is set to Btrfs.
Thanks,
Josef
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