On 2014-09-29 16:10 (Mon), Liu Bo wrote:

Hi Tomasz,

On Mon, Sep 29, 2014 at 02:00:18PM +0200, Tomasz Chmielewski wrote:

quoted

System froze under 3.17.0-rc6 with btrfs. It had to be hard rebooted.

How does this happen?  A stressful write with compression?

Rsync (with --inplace - can be stressful / lead to fragmentation on 
large files which change) + snapshot + remove old snapshot, for several 
remote sources (rsync server1, snapshot, remove old snap; rsync server2, 
snapshot, remove old snap etc.).

Filesystem is RAID-1 with compress-force=zlib:

/dev/sdc1 on /mnt/lxc2 type btrfs 
(rw,noatime,compress-force=zlib,space_cache)

The last operation written to the logfile was snapshot removal.


-- 
Tomasz Chmielewski
http://www.sslrack.com