================================================
WARNING: lock held when returning to user space!
syzkaller #0 Not tainted
------------------------------------------------
syz.1.640/8237 is leaving the kernel with locks still held!
1 lock held by syz.1.640/8237:
 #0: ffff888033e70420 (sb_writers#22){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:509