F2FS-fs (loop8): Can't find valid F2FS filesystem in 1th superblock
F2FS-fs (loop8): invalid crc value
F2FS-fs (loop8): Disable nat_bits due to incorrect cp_ver (10241045589465957861, 10241044815247771109)
F2FS-fs (loop8): Start checkpoint disabled!
BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 1 PID: 18055 Comm: syz.8.3921 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/23/2026
Call trace:
 dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106
 dump_stack+0x1c/0x5c lib/dump_stack.c:113
 add_chain_cache kernel/locking/lockdep.c:-1 [inline]
 lookup_chain_cache_add kernel/locking/lockdep.c:3844 [inline]
 validate_chain kernel/locking/lockdep.c:3865 [inline]
 __lock_acquire+0x2618/0x7280 kernel/locking/lockdep.c:5171
 lock_acquire+0x210/0x63c kernel/locking/lockdep.c:5790
 down_write+0x5c/0x88 kernel/locking/rwsem.c:1573
 f2fs_down_write fs/f2fs/f2fs.h:2206 [inline]
 __f2fs_submit_merged_write fs/f2fs/data.c:645 [inline]
 __submit_merged_write_cond+0x118/0x4d0 fs/f2fs/data.c:679
 f2fs_submit_merged_write fs/f2fs/data.c:689 [inline]
 f2fs_flush_merged_writes+0x40/0xd0 fs/f2fs/data.c:701
 f2fs_write_checkpoint+0xe94/0x17a0 fs/f2fs/checkpoint.c:1677
 f2fs_disable_checkpoint+0x32c/0x5a0 fs/f2fs/super.c:2237
 f2fs_fill_super+0x4de8/0x57bc fs/f2fs/super.c:4577
 mount_bdev+0x264/0x35c fs/super.c:1454
 f2fs_mount+0x44/0x58 fs/f2fs/super.c:4708
 legacy_get_tree+0xd8/0x174 fs/fs_context.c:632
 vfs_get_tree+0x90/0x278 fs/super.c:1584
 do_new_mount+0x228/0x818 fs/namespace.c:3104
 path_mount+0x5ac/0xe6c fs/namespace.c:3462
 do_mount fs/namespace.c:3475 [inline]
 __do_sys_mount fs/namespace.c:3683 [inline]
 __se_sys_mount fs/namespace.c:3660 [inline]
 __arm64_sys_mount+0x4a0/0x5a0 fs/namespace.c:3660
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x12c arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:589
F2FS-fs (loop8): Try to recover 1th superblock, ret: 0
F2FS-fs (loop8): Mounted with checkpoint version = 48b305e6