================================================
WARNING: lock held when returning to user space!
syzkaller #0 Not tainted
------------------------------------------------
syz.4.5144/23056 is leaving the kernel with locks still held!
1 lock held by syz.4.5144/23056:
 #0: ffff8880583ba420 (sb_writers#16){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:509