I'm using btrfs on two devices here, /usr on sda3 and /home on sdb (dm-crypt
device on the whole disk). With btrfs-master the whole system hangs when
accessing /home. The system hangs when I'm logging in into my account with KDE
and is easily reproducible with dbench. On /usr the hangs appeared also but
not as often as on the /home-device. I've tested on a third device with new
created btrfs on top of dm-crypt, but wasn't able to reproduce the hangs. The
filesystems are created without metadata-mirroring (-m single). I've bisected
this to:
commit 11833d66be94b514652466802100378046c16b72
Author: Yan Zheng <zheng.yan@xxxxxxxxxx>
Date: Fri Sep 11 16:11:19 2009 -0400
Btrfs: improve async block group caching
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