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WARNING: lock held when returning to user space!
5.6.0-rc3-syzkaller #0 Not tainted
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syz-executor005/10349 is leaving the kernel with locks still held!
1 lock held by syz-executor005/10349:
 #0: ffff888214fd6428 (sb_writers#4){.+.+}, at: file_start_write include/linux/fs.h:2903 [inline]
 #0: ffff888214fd6428 (sb_writers#4){.+.+}, at: ovl_write_iter+0xcc1/0x1090 fs/overlayfs/file.c:348