Just mount the cgroupfs: # mount -t cgroup -o cpuset xxx /mnt (oops!!)
The bug is caused by: ========= commit 0df6a63f8735a7c8a877878bc215d4312e41ef81 Author: Al Viro <v...@zeniv.linux.org.uk> Date: Tue Dec 21 13:29:29 2010 -0500 switch cgroup switching it to s_d_op allows to kill the cgroup_lookup() kludge. Signed-off-by: Al Viro <v...@zeniv.linux.org.uk> ========= This line: + sb->s_d_op = &cgroup_dops; will cause the dentry op be set twice, and thus trigger the bomb: struct dentry *d_alloc(struct dentry * parent, const struct qstr *name) { ... if (parent) { ... d_set_d_op(dentry, dentry->d_sb->s_d_op); ... } ... } static struct dentry *d_alloc_and_lookup(struct dentry *parent, struct qstr *name, struct nameidata *nd) { ... dentry = d_alloc(parent, name); ... old = inode->i_op->lookup(inode, dentry, nd); ... } simple_lookup() will call d_set_d_op()... ============== [ 90.740906] kernel BUG at fs/dcache.c:1360! .. [ 90.810321] Call Trace: [ 90.814166] [<c04f97ad>] simple_lookup+0x26/0x3c [ 90.818015] [<c04e86ce>] d_alloc_and_lookup+0x36/0x54 [ 90.818021] [<c04e8aa8>] __lookup_hash+0x6a/0x71 [ 90.818026] [<c04e8f33>] lookup_one_len+0x81/0x90 [ 90.818034] [<c0473083>] cgroup_add_file+0x8e/0x132 [ 90.818041] [<c0473152>] cgroup_add_files+0x2b/0x3d [ 90.818047] [<c0473188>] cgroup_populate_dir+0x24/0xdb [ 90.818053] [<c047360b>] cgroup_mount+0x3cc/0x431 [ 90.818061] [<c04e238d>] vfs_kern_mount+0x57/0x109 [ 90.818066] [<c047323f>] ? cgroup_mount+0x0/0x431 [ 90.818072] [<c04e248e>] do_kern_mount+0x38/0xba [ 90.818077] [<c04f6706>] do_mount+0x5e4/0x60f [ 90.818082] [<c04f6094>] ? copy_mount_options+0x78/0xd7 [ 90.818087] [<c04f68de>] sys_mount+0x66/0x94 [ 90.818093] [<c040329f>] sysenter_do_call+0x12/0x38 _______________________________________________ Containers mailing list contain...@lists.linux-foundation.org https://lists.linux-foundation.org/mailman/listinfo/containers _______________________________________________ Devel mailing list Devel@openvz.org https://openvz.org/mailman/listinfo/devel