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WARNING: lock held when returning to user space!
syzkaller #0 Not tainted
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syz.4.580/7918 is leaving the kernel with locks still held!
1 lock held by syz.4.580/7918:
 #0: ffff88805bc08420 (sb_writers#16){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:509