BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 0 PID: 16416 Comm: syz.1.2624 Not tainted 5.15.186-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call trace:
 dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 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:3735 [inline]
 validate_chain kernel/locking/lockdep.c:3756 [inline]
 __lock_acquire+0x1b30/0x651c kernel/locking/lockdep.c:5012
 lock_acquire+0x1f4/0x620 kernel/locking/lockdep.c:5623
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0xb0/0x10c kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:363 [inline]
 d_alloc fs/dcache.c:1831 [inline]
 d_alloc_parallel+0xa8/0x1104 fs/dcache.c:2582
 __lookup_slow+0x104/0x380 fs/namei.c:1648
 lookup_one_len+0x178/0x28c fs/namei.c:2718
 start_creating+0x19c/0x2e0 fs/debugfs/inode.c:354
 debugfs_create_dir+0x30/0x3f4 fs/debugfs/inode.c:559
 bdi_debug_register mm/backing-dev.c:110 [inline]
 bdi_register_va+0x27c/0x7a4 mm/backing-dev.c:891
 bdi_register+0xcc/0x114 mm/backing-dev.c:916
 device_add_disk+0x670/0xad0 block/genhd.c:502
 add_disk include/linux/genhd.h:200 [inline]
 md_alloc+0x6a0/0xa54 drivers/md/md.c:5782
 md_probe+0x6c/0x88 drivers/md/md.c:5812
 blk_probe_dev block/genhd.c:685 [inline]
 blk_request_module+0x274/0x29c block/genhd.c:-1
 blkdev_get_no_open+0x4c/0x1b4 block/bdev.c:740
 blkdev_get_by_dev+0x84/0x874 block/bdev.c:807
 blkdev_open+0x108/0x27c block/fops.c:466
 do_dentry_open+0x760/0xebc fs/open.c:826
 vfs_open+0x7c/0x90 fs/open.c:956
 do_open fs/namei.c:3608 [inline]
 path_openat+0x1f80/0x26e4 fs/namei.c:3742
 do_filp_open+0x164/0x330 fs/namei.c:3769
 do_sys_openat2+0x128/0x3d8 fs/open.c:1253
 do_sys_open fs/open.c:1269 [inline]
 __do_sys_openat fs/open.c:1285 [inline]
 __se_sys_openat fs/open.c:1280 [inline]
 __arm64_sys_openat+0x120/0x154 fs/open.c:1280
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
block device autoloading is deprecated and will be removed.