BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 0 PID: 7804 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call trace:
 dump_backtrace+0x1c0/0x1ec 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:3772 [inline]
 validate_chain kernel/locking/lockdep.c:3793 [inline]
 __lock_acquire+0x1864/0x6800 kernel/locking/lockdep.c:5049
 lock_acquire+0x20c/0x63c kernel/locking/lockdep.c:5662
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x6c/0xb0 kernel/locking/spinlock.c:162
 get_partial_node+0x44/0x3b0 mm/slub.c:2215
 get_partial mm/slub.c:2330 [inline]
 ___slab_alloc+0x67c/0xe98 mm/slub.c:3131
 __slab_alloc+0x74/0xd0 mm/slub.c:3240
 slab_alloc_node mm/slub.c:3325 [inline]
 slab_alloc mm/slub.c:3367 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3374 [inline]
 kmem_cache_alloc+0x298/0x308 mm/slub.c:3383
 radix_tree_node_alloc+0x180/0x340 lib/radix-tree.c:251
 idr_get_free+0x240/0x8ac lib/radix-tree.c:1504
 idr_alloc_u32 lib/idr.c:48 [inline]
 idr_alloc_cyclic+0x208/0x4e8 lib/idr.c:127
 __kernfs_new_node+0x128/0x5f4 fs/kernfs/dir.c:620
 kernfs_new_node+0x11c/0x22c fs/kernfs/dir.c:690
 __kernfs_create_file+0x60/0x2d4 fs/kernfs/file.c:1068
 cgroup_add_file kernel/cgroup/cgroup.c:4225 [inline]
 cgroup_addrm_files+0x644/0xa70 kernel/cgroup/cgroup.c:4285
 css_populate_dir+0xfc/0x330 kernel/cgroup/cgroup.c:1794
 cgroup_apply_control_enable+0x588/0x9f8 kernel/cgroup/cgroup.c:3291
 cgroup_mkdir+0x9b4/0xcec kernel/cgroup/cgroup.c:5789
 kernfs_iop_mkdir+0x114/0x160 fs/kernfs/dir.c:1221
 vfs_mkdir+0x314/0x4d4 fs/namei.c:4114
 do_mkdirat+0x1b8/0x3ec fs/namei.c:4139
 __do_sys_mkdirat fs/namei.c:4154 [inline]
 __se_sys_mkdirat fs/namei.c:4152 [inline]
 __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4152
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 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:585