Hello, Linus.
Unfortunately, the commit to fix the cgroup mount race in the previous
pull request can lead to hangs. The original bug has been around for
a while and isn't too likely to be triggered in usual use cases.
Revert the commit for now.
Thanks.
The following changes since commit bfb0b80db5f9dca5ac0a5fd0edb765ee555e5a8e:
cgroup: avoid attaching a cgroup root to two different superblocks (2017-04-11 09:00:57 +0900)
are available in the git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git for-4.11-fixes
for you to fetch changes up to 330c418638612d7658b6314e6a244fcb5f7efac5:
Revert "cgroup: avoid attaching a cgroup root to two different superblocks" (2017-04-16 23:17:37 +0900)
----------------------------------------------------------------
Tejun Heo (1):
Revert "cgroup: avoid attaching a cgroup root to two different superblocks"
kernel/cgroup/cgroup-v1.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/cgroup/cgroup-v1.c b/kernel/cgroup/cgroup-v1.c
index 12e19f0..1dc22f6 100644
--- a/kernel/cgroup/cgroup-v1.c
+++ b/kernel/cgroup/cgroup-v1.c
@@ -1146,7 +1146,7 @@ struct dentry *cgroup1_mount(struct file_system_type *fs_type, int flags,
* path is super cold. Let's just sleep a bit and retry.
*/
pinned_sb = kernfs_pin_sb(root->kf_root, NULL);
- if (IS_ERR_OR_NULL(pinned_sb) ||
+ if (IS_ERR(pinned_sb) ||
!percpu_ref_tryget_live(&root->cgrp.self.refcnt)) {
mutex_unlock(&cgroup_mutex);
if (!IS_ERR_OR_NULL(pinned_sb))
--
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