Replace BUG_ON(fuse_control_sb) with WARN_ON() that returns -EBUSY. Currently get_tree_single() prevents duplicate calls to fuse_ctl_fill_super(), making this condition unreachable in practice. However, BUG_ON() should not be used for conditions that can be handled gracefully. Use WARN_ON() to log the unexpected state instead of crashing. Signed-off-by: Yuto Ohnuki --- fs/fuse/control.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/fs/fuse/control.c b/fs/fuse/control.c index 140bd5730d99..8bac837fd4e1 100644 --- a/fs/fuse/control.c +++ b/fs/fuse/control.c @@ -316,7 +316,11 @@ static int fuse_ctl_fill_super(struct super_block *sb, struct fs_context *fsc) return err; mutex_lock(&fuse_mutex); - BUG_ON(fuse_control_sb); + if (WARN_ON(fuse_control_sb)) { + mutex_unlock(&fuse_mutex); + return -EBUSY; + } + fuse_control_sb = sb; list_for_each_entry(fc, &fuse_conn_list, entry) { err = fuse_ctl_add_conn(fc); -- 2.50.1 Amazon Web Services EMEA SARL, 38 avenue John F. Kennedy, L-1855 Luxembourg, R.C.S. Luxembourg B186284 Amazon Web Services EMEA SARL, Irish Branch, One Burlington Plaza, Burlington Road, Dublin 4, Ireland, branch registration number 908705