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); -- 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
