On Wed, Jun 11, 2014 at 08:35:44PM +0900, Tetsuo Handa wrote:
> I also confirmed that the command line which triggers this oops is
>
> mount -n -o ro,remount sysfs /sys
>
> in /etc/init.d/halt script in CentOS 6.5.
> Manually executing the command line from login shell triggers this oops.
>
> I don't know why but commit 59a3d4c363 revealed a refcount bug
> in sysfs (or maybe in vfs)?
Try to check if this helps:
diff --git a/fs/dcache.c b/fs/dcache.c
index be2bea8..e99c6f5 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -532,10 +532,12 @@ static inline struct dentry *lock_parent(struct dentry
*dentry)
struct dentry *parent = dentry->d_parent;
if (IS_ROOT(dentry))
return NULL;
+ if (unlikely((int)dentry->d_lockref.count < 0))
+ return NULL;
if (likely(spin_trylock(&parent->d_lock)))
return parent;
- spin_unlock(&dentry->d_lock);
rcu_read_lock();
+ spin_unlock(&dentry->d_lock);
again:
parent = ACCESS_ONCE(dentry->d_parent);
spin_lock(&parent->d_lock);
--
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