BUG: MAX_LOCKDEP_CHAINS too low! turning off the locking correctness validator. CPU: 0 PID: 7083 Comm: syz-executor Not tainted 5.15.189-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 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_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xc4/0x14c kernel/locking/spinlock.c:162 pneigh_queue_purge+0xf4/0x474 net/core/neighbour.c:307 __neigh_ifdown+0x2f0/0x348 net/core/neighbour.c:393 neigh_ifdown+0x2c/0x40 net/core/neighbour.c:408 arp_ifdown+0x28/0x38 net/ipv4/arp.c:1288 fib_disable_ip+0x154/0x174 net/ipv4/fib_frontend.c:1431 fib_netdev_event+0x2e8/0x4c8 net/ipv4/fib_frontend.c:-1 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xd4/0x164 kernel/notifier.c:391 call_netdevice_notifiers_info net/core/dev.c:2049 [inline] call_netdevice_notifiers_extack net/core/dev.c:2061 [inline] call_netdevice_notifiers net/core/dev.c:2075 [inline] dev_close_many+0x2cc/0x440 net/core/dev.c:1650 dev_close+0x148/0x1f8 net/core/dev.c:1672 lapbeth_device_event+0x2e8/0x964 drivers/net/wan/lapbether.c:466 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xd4/0x164 kernel/notifier.c:391 call_netdevice_notifiers_info net/core/dev.c:2049 [inline] call_netdevice_notifiers_extack net/core/dev.c:2061 [inline] call_netdevice_notifiers net/core/dev.c:2075 [inline] __dev_close_many+0x188/0x3a8 net/core/dev.c:1595 dev_close_many+0x1e8/0x440 net/core/dev.c:1646 unregister_netdevice_many+0x3d4/0x17d0 net/core/dev.c:11110 unregister_netdevice_queue+0x2ac/0x2f8 net/core/dev.c:11067 unregister_netdevice include/linux/netdevice.h:3020 [inline] nsim_destroy+0x58/0x164 drivers/net/netdevsim/netdev.c:382 __nsim_dev_port_del+0x144/0x1a4 drivers/net/netdevsim/dev.c:1349 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1362 [inline] nsim_dev_reload_destroy+0x144/0x204 drivers/net/netdevsim/dev.c:1561 nsim_dev_remove+0x5c/0x108 drivers/net/netdevsim/dev.c:1577 nsim_bus_remove+0x20/0x30 drivers/net/netdevsim/bus.c:381 __device_release_driver drivers/base/dd.c:1227 [inline] device_release_driver_internal+0x3c0/0x63c drivers/base/dd.c:1262 device_release_driver+0x28/0x38 drivers/base/dd.c:1285 bus_remove_device+0x294/0x388 drivers/base/bus.c:531 device_del+0x568/0x964 drivers/base/core.c:3600 device_unregister+0x2c/0xcc drivers/base/core.c:3633 nsim_bus_dev_del drivers/net/netdevsim/bus.c:454 [inline] del_device_store+0x25c/0x33c drivers/net/netdevsim/bus.c:354 bus_attr_store+0x80/0xa4 drivers/base/bus.c:124 sysfs_kf_write+0x1f8/0x278 fs/sysfs/file.c:139 kernfs_fop_write_iter+0x320/0x478 fs/kernfs/file.c:296 call_write_iter include/linux/fs.h:2172 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x7c8/0xa2c fs/read_write.c:594 ksys_write+0x120/0x210 fs/read_write.c:647 __do_sys_write fs/read_write.c:659 [inline] __se_sys_write fs/read_write.c:656 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:656 __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 netdevsim netdevsim2 netdevsim0: renamed from eth0 netdevsim netdevsim2 netdevsim1: renamed from eth1 netdevsim netdevsim2 netdevsim2: renamed from eth2 netdevsim netdevsim2 netdevsim3: renamed from eth3 8021q: adding VLAN 0 to HW filter on device bond0 8021q: adding VLAN 0 to HW filter on device team0 hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network 8021q: adding VLAN 0 to HW filter on device batadv0 device veth0_vlan entered promiscuous mode device veth1_vlan entered promiscuous mode device veth0_macvtap entered promiscuous mode device veth1_macvtap entered promiscuous mode batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_0 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_0 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_0 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_0 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_0 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: batadv0: Interface activated: batadv_slave_0 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3f) already exists on: batadv_slave_1 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3f) already exists on: batadv_slave_1 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3f) already exists on: batadv_slave_1 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3f) already exists on: batadv_slave_1 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3f) already exists on: batadv_slave_1 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: batadv0: Interface activated: batadv_slave_1 netdevsim netdevsim2 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim2 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim2 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim2 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 ieee80211 phy24: Selected rate control algorithm 'minstrel_ht' ieee80211 phy25: Selected rate control algorithm 'minstrel_ht'