loop6: detected capacity change from 0 to 2048
BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 1 UID: 0 PID: 10009 Comm: syz.6.1020 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 dump_stack+0x1c/0x28 lib/dump_stack.c:129
 add_chain_cache kernel/locking/lockdep.c:-1 [inline]
 lookup_chain_cache_add kernel/locking/lockdep.c:3855 [inline]
 validate_chain kernel/locking/lockdep.c:3876 [inline]
 __lock_acquire+0xf9c/0x30a4 kernel/locking/lockdep.c:5237
 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
 bio_queue_enter block/blk.h:90 [inline]
 blk_mq_submit_bio+0x9a0/0x2168 block/blk-mq.c:3153
 __submit_bio+0x1d8/0x4d8 block/blk-core.c:637
 __submit_bio_noacct_mq block/blk-core.c:724 [inline]
 submit_bio_noacct_nocheck+0x29c/0x9a4 block/blk-core.c:755
 submit_bio_noacct+0xde0/0x186c block/blk-core.c:879
 submit_bio+0x3b4/0x550 block/blk-core.c:921
 submit_bh_wbc+0x3ec/0x4bc fs/buffer.c:2824
 submit_bh+0x30/0x40 fs/buffer.c:2829
 nilfs_mdt_submit_block+0x390/0x884 fs/nilfs2/mdt.c:153
 nilfs_mdt_read_block+0x60/0x2bc fs/nilfs2/mdt.c:178
 nilfs_mdt_get_block+0x114/0xeb0 fs/nilfs2/mdt.c:254
 nilfs_cpfile_get_checkpoint_block fs/nilfs2/cpfile.c:181 [inline]
 nilfs_cpfile_read_checkpoint+0x1b4/0x5c8 fs/nilfs2/cpfile.c:257
 nilfs_ifile_read+0x140/0x1b8 fs/nilfs2/ifile.c:206
 nilfs_attach_checkpoint+0xd8/0x18c fs/nilfs2/super.c:568
 nilfs_fill_super+0x30c/0x568 fs/nilfs2/super.c:1084
 nilfs_get_tree+0x378/0x664 fs/nilfs2/super.c:1228
 vfs_get_tree+0x90/0x28c fs/super.c:1751
 fc_mount fs/namespace.c:1208 [inline]
 do_new_mount_fc fs/namespace.c:3651 [inline]
 do_new_mount+0x284/0x944 fs/namespace.c:3727
 path_mount+0x5b4/0xdfc fs/namespace.c:4037
 do_mount fs/namespace.c:4050 [inline]
 __do_sys_mount fs/namespace.c:4238 [inline]
 __se_sys_mount fs/namespace.c:4215 [inline]
 __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4215
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:746
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
NILFS error (device loop6): nilfs_dotdot: directory #12 missing '..'
Remounting filesystem read-only