BUG: MAX_LOCKDEP_CHAINS too low! turning off the locking correctness validator. CPU: 0 UID: 0 PID: 10304 Comm: syz-executor Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 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+0xf88/0x2f44 kernel/locking/lockdep.c:5237 lock_acquire+0x140/0x368 kernel/locking/lockdep.c:5868 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:150 [inline] _raw_spin_lock_bh+0x48/0x60 kernel/locking/spinlock.c:182 spin_lock_bh include/linux/spinlock.h:348 [inline] page_pool_producer_lock+0x78/0x9c net/core/page_pool.c:169 page_pool_release+0x928/0xa94 net/core/page_pool.c:1194 page_pool_destroy+0x1b4/0x3cc net/core/page_pool.c:1300 nsim_del_napi drivers/net/netdevsim/netdev.c:537 [inline] nsim_stop+0x2bc/0x3e0 drivers/net/netdevsim/netdev.c:554 __dev_close_many+0x2f8/0x644 net/core/dev.c:1776 netif_close_many+0x1dc/0x370 net/core/dev.c:1801 netif_close_many_and_unlock+0x38/0x158 net/core/dev.c:12315 unregister_netdevice_many_notify+0x590/0x18d8 net/core/dev.c:12385 unregister_netdevice_many net/core/dev.c:12484 [inline] unregister_netdevice_queue+0x270/0x308 net/core/dev.c:12294 unregister_netdevice include/linux/netdevice.h:3444 [inline] nsim_destroy+0x234/0x5e4 drivers/net/netdevsim/netdev.c:1193 __nsim_dev_port_del+0x134/0x1e4 drivers/net/netdevsim/dev.c:1547 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1561 [inline] nsim_dev_reload_destroy+0x138/0x208 drivers/net/netdevsim/dev.c:1785 nsim_drv_remove+0x5c/0x10c drivers/net/netdevsim/dev.c:1800 nsim_bus_remove+0x20/0x30 drivers/net/netdevsim/bus.c:427 device_remove+0xc4/0x134 drivers/base/dd.c:619 __device_release_driver drivers/base/dd.c:1352 [inline] device_release_driver_internal+0x124/0x208 drivers/base/dd.c:1375 device_release_driver+0x28/0x38 drivers/base/dd.c:1398 bus_remove_device+0x2d0/0x3f8 drivers/base/bus.c:657 device_del+0x3f0/0x710 drivers/base/core.c:3895 device_unregister+0x2c/0xf0 drivers/base/core.c:3936 nsim_bus_dev_del+0x60/0x88 drivers/net/netdevsim/bus.c:491 del_device_store+0x248/0x2d0 drivers/net/netdevsim/bus.c:244 bus_attr_store+0x80/0xa4 drivers/base/bus.c:172 sysfs_kf_write+0xe0/0x108 fs/sysfs/file.c:142 kernfs_fop_write_iter+0x264/0x3c0 fs/kernfs/file.c:352 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x52c/0xa14 fs/read_write.c:688 ksys_write+0x12c/0x224 fs/read_write.c:740 __do_sys_write fs/read_write.c:751 [inline] __se_sys_write fs/read_write.c:748 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:748 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:736 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 netdevsim netdevsim1 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim1 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim1 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim1 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim1 netdevsim0: renamed from eth0 8021q: adding VLAN 0 to HW filter on device netdevsim0 netdevsim netdevsim1 netdevsim1: renamed from eth1 8021q: adding VLAN 0 to HW filter on device netdevsim1 netdevsim netdevsim1 netdevsim2: renamed from eth2 8021q: adding VLAN 0 to HW filter on device netdevsim2 netdevsim netdevsim1 netdevsim3: renamed from eth3 8021q: adding VLAN 0 to HW filter on device netdevsim3 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 veth0_vlan: entered promiscuous mode veth1_vlan: entered promiscuous mode veth0_macvtap: entered promiscuous mode veth1_macvtap: entered promiscuous mode batman_adv: batadv0: Interface activated: batadv_slave_0 batman_adv: batadv0: Interface activated: batadv_slave_1 ieee80211 phy25: Selected rate control algorithm 'minstrel_ht' ieee80211 phy26: Selected rate control algorithm 'minstrel_ht'