On Sat, Jan 02, 2016 at 06:54:37AM -0500, Tejun Heo wrote: > On Fri, Jan 01, 2016 at 03:40:28PM -0800, Jeremiah Mahler wrote: > > all, > > > > When running the latest linux-next (20151231) two of my machines > > hang early in the boot sequence. The initial message is for a > > NULL pointer dereference. > > > > BUG: unable to handle kernel NULL pointer dereference at 0000000000000030 > > > > And the RIP line refers to cgroup_path. > > > > RIP [<ffffffff810eb178>] cgroup_path+0x30/0x80 > > > > Attached are pictures of the back trace. > > > > Let me know if I can do anything else to help. I will investigate the > > problem further if I get a chance. > > This is most likely from the recent changes from cgroup ns support. > Reverted the patchset for now as it also introduced a bisectability > issue. Serge, can you please look into this one? Hi Tejun, an updated set is at https://git.kernel.org/cgit/linux/kernel/git/sergeh/linux-security.git/commit/?h=cgroupns.v9 Would you like a new patchset send to the list, or is the github tree ok? This branch: 1. puts lookup_one_len() under inode lock 2. makes cgroup_path non-namespaced, so only calls to cgroup_path_ns() are namespaced. 3. makes cgroup_path{,_ns} take the needed locks, since external callers cannot do so. 4. Fixes the bisectability problem of to_cg_ns() being defined after use (patch 4 -> patch 3) thanks, -serge -- To unsubscribe from this list: send the line "unsubscribe cgroups" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
