Sorry I didn't notice this earlier. Linux 3.15 breaks my production system :( The cause appears to be: commit 2bd59d48ebfb3df41ee56938946ca0dd30887312 Author: Tejun Heo <tj@xxxxxxxxxx> Date: Tue Feb 11 11:52:49 2014 -0500 cgroup: convert to kernfs In particular, this piece: - sb->s_magic = CGROUP_SUPER_MAGIC; The result is that cgroup shows up with the wrong magic number, so my code goes "oh crap, cgroupfs isn't mounted" and fails. I can change my code to hack around this, but I can imagine other things getting tripped up. Is there still time to fix this? --Andy -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html