F2FS-fs (loop0): Invalid blocksize (65536), supports only 4KB
F2FS-fs (loop0): Can't find valid F2FS filesystem in 1th superblock
F2FS-fs (loop0): Found nat_bits in checkpoint
F2FS-fs (loop0): Mounted with checkpoint version = 3e17dab1
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WARNING: lock held when returning to user space!
4.14.295-syzkaller #0 Not tainted
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syz-executor166/7993 is leaving the kernel with locks still held!
1 lock held by s