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WARNING: lock held when returning to user space!
syzkaller #0 Not tainted
------------------------------------------------
syz.3.5940/1947 is leaving the kernel with locks still held!
1 lock held by syz.3.5940/1947:
 #0: ffff88807c828420 (sb_writers#16){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:509