Ceph

During some fsstress runs, I've managed to end up with an OSD spinning at 100% cpu, making no apparent progress, which the monitor thinks is down. This is running on kai with btrfs. The first time I thought it dismissed it as an unfortunate interaction between cfuse (running in my source dir) and the OSD (running in a different part of my source dir, but on the same btrfs partition).
Then I reproduced with the cfuse mount in a completely separate drive.