BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low! turning off the locking correctness validator. CPU: 0 PID: 659 Comm: kworker/u4:3 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026 Workqueue: netns cleanup_net 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_nested+0x5c/0x78 kernel/locking/spinlock.c:378 raw_spin_rq_lock_nested kernel/sched/core.c:538 [inline] raw_spin_rq_lock kernel/sched/sched.h:1362 [inline] rq_lock kernel/sched/sched.h:1652 [inline] ttwu_queue kernel/sched/core.c:3903 [inline] try_to_wake_up+0x3f0/0xc68 kernel/sched/core.c:4228 wake_up_process+0x18/0x24 kernel/sched/core.c:4362 wake_up_worker kernel/workqueue.c:859 [inline] insert_work+0x2a4/0x37c kernel/workqueue.c:1369 __queue_work+0xcbc/0x1234 kernel/workqueue.c:1520 queue_work_on+0xc0/0x164 kernel/workqueue.c:1548 queue_work include/linux/workqueue.h:512 [inline] schedule_work include/linux/workqueue.h:573 [inline] nsim_fib_event_schedule_work drivers/net/netdevsim/fib.c:-1 [inline] nsim_fib_event_nb+0xabc/0xdd4 drivers/net/netdevsim/fib.c:1043 notifier_call_chain kernel/notifier.c:87 [inline] atomic_notifier_call_chain+0x174/0x2a0 kernel/notifier.c:225 call_fib_notifiers+0x44/0x74 net/core/fib_notifier.c:35 call_fib6_notifiers+0x50/0x80 net/ipv6/fib6_notifier.c:22 call_fib6_entry_notifiers net/ipv6/ip6_fib.c:402 [inline] fib6_del_route net/ipv6/ip6_fib.c:1997 [inline] fib6_del+0xc48/0x11bc net/ipv6/ip6_fib.c:2038 fib6_clean_node+0x22c/0x4b0 net/ipv6/ip6_fib.c:2200 fib6_walk_continue+0x654/0x878 net/ipv6/ip6_fib.c:2122 fib6_walk+0x140/0x254 net/ipv6/ip6_fib.c:2170 fib6_clean_tree net/ipv6/ip6_fib.c:2250 [inline] __fib6_clean_all+0x1f4/0x334 net/ipv6/ip6_fib.c:2266 fib6_clean_all+0x3c/0x50 net/ipv6/ip6_fib.c:2277 rt6_sync_down_dev net/ipv6/route.c:4943 [inline] rt6_disable_ip+0x108/0x7cc net/ipv6/route.c:4948 addrconf_ifdown+0x148/0x15ec net/ipv6/addrconf.c:3798 addrconf_notify+0x340/0xc8c net/ipv6/addrconf.c:-1 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xd4/0x164 kernel/notifier.c:455 call_netdevice_notifiers_info net/core/dev.c:2014 [inline] call_netdevice_notifiers_extack net/core/dev.c:2052 [inline] call_netdevice_notifiers net/core/dev.c:2066 [inline] dev_close_many+0x2d0/0x440 net/core/dev.c:1614 unregister_netdevice_many_notify+0x3dc/0x1834 net/core/dev.c:10997 unregister_netdevice_many net/core/dev.c:11077 [inline] unregister_netdevice_queue+0x2b8/0x30c net/core/dev.c:10960 unregister_netdevice include/linux/netdevice.h:3075 [inline] nsim_destroy+0x58/0x164 drivers/net/netdevsim/netdev.c:382 __nsim_dev_port_del+0x144/0x1a4 drivers/net/netdevsim/dev.c:1433 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1445 [inline] nsim_dev_reload_destroy+0x240/0x43c drivers/net/netdevsim/dev.c:1663 nsim_dev_reload_down+0x9c/0xd4 drivers/net/netdevsim/dev.c:968 devlink_reload+0x1b8/0x584 net/devlink/leftover.c:4472 devlink_pernet_pre_exit+0x118/0x2b0 net/devlink/leftover.c:12503 ops_pre_exit_list net/core/net_namespace.c:162 [inline] cleanup_net+0x47c/0xa84 net/core/net_namespace.c:620 process_one_work+0x7f8/0x13a4 kernel/workqueue.c:2292 worker_thread+0x8c4/0xfec kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850 netdevsim netdevsim2 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim2 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim2 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim2 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim0 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim0 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim0 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 device hsr_slave_0 left promiscuous mode device hsr_slave_1 left promiscuous mode batman_adv: batadv0: Interface deactivated: batadv_slave_0 batman_adv: batadv0: Removing interface: batadv_slave_0 batman_adv: batadv0: Interface deactivated: batadv_slave_1 batman_adv: batadv0: Removing interface: batadv_slave_1 device bridge_slave_1 left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_0 left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state device hsr_slave_0 left promiscuous mode device hsr_slave_1 left promiscuous mode batman_adv: batadv0: Interface deactivated: batadv_slave_0 batman_adv: batadv0: Removing interface: batadv_slave_0 batman_adv: batadv0: Interface deactivated: batadv_slave_1 batman_adv: batadv0: Removing interface: batadv_slave_1 device bridge_slave_1 left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_0 left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state device veth1_macvtap left promiscuous mode device veth0_macvtap left promiscuous mode device veth1_vlan left promiscuous mode device veth0_vlan left promiscuous mode device veth1_macvtap left promiscuous mode device veth0_macvtap left promiscuous mode device veth1_vlan left promiscuous mode device veth0_vlan left promiscuous mode bond2 (unregistering): (slave geneve3): Releasing active interface bond2 (unregistering): Released all slaves bond1 (unregistering): (slave geneve2): Releasing active interface bond1 (unregistering): Released all slaves team0 (unregistering): Port device team_slave_1 removed team0 (unregistering): Port device team_slave_0 removed bond0 (unregistering): (slave bond_slave_1): Releasing backup interface bond0 (unregistering): (slave bond_slave_0): Releasing backup interface bond0 (unregistering): Released all slaves