BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low! turning off the locking correctness validator. CPU: 0 UID: 0 PID: 8413 Comm: syz-executor Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 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+0xf9c/0x30a4 kernel/locking/lockdep.c:5237 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868 _raw_spin_lock_nested+0x50/0x6c kernel/locking/spinlock.c:378 raw_spin_rq_lock_nested kernel/sched/core.c:638 [inline] raw_spin_rq_lock kernel/sched/sched.h:1546 [inline] rq_lock kernel/sched/sched.h:1868 [inline] ttwu_queue kernel/sched/core.c:3967 [inline] try_to_wake_up+0x440/0xe24 kernel/sched/core.c:4293 wake_up_process+0x18/0x24 kernel/sched/core.c:4424 kthread_insert_work+0x294/0x4b0 kernel/kthread.c:1169 kthread_queue_work+0x100/0x184 kernel/kthread.c:1192 synchronize_rcu_expedited_queue_work kernel/rcu/tree_exp.h:498 [inline] synchronize_rcu_expedited+0x3fc/0x628 kernel/rcu/tree_exp.h:967 synchronize_net+0x80/0xa8 net/core/dev.c:12117 dev_deactivate_many+0x4b0/0xabc net/sched/sch_generic.c:1375 __dev_close_many+0x238/0x704 net/core/dev.c:1739 netif_close_many+0x1e8/0x448 net/core/dev.c:1780 unregister_netdevice_many_notify+0x4a8/0x1de0 net/core/dev.c:12216 unregister_netdevice_many net/core/dev.c:12317 [inline] unregister_netdevice_queue+0x2b4/0x300 net/core/dev.c:12161 unregister_netdevice include/linux/netdevice.h:3389 [inline] nsim_destroy+0x1c8/0x600 drivers/net/netdevsim/netdev.c:1171 __nsim_dev_port_del+0x13c/0x19c drivers/net/netdevsim/dev.c:1473 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1485 [inline] nsim_dev_reload_destroy+0x240/0x43c drivers/net/netdevsim/dev.c:1707 nsim_drv_remove+0x5c/0x154 drivers/net/netdevsim/dev.c:1722 nsim_bus_remove+0x20/0x30 drivers/net/netdevsim/bus.c:419 device_remove drivers/base/dd.c:569 [inline] __device_release_driver drivers/base/dd.c:1274 [inline] device_release_driver_internal+0x3a8/0x68c drivers/base/dd.c:1297 device_release_driver+0x28/0x38 drivers/base/dd.c:1320 bus_remove_device+0x310/0x3b0 drivers/base/bus.c:579 device_del+0x47c/0x808 drivers/base/core.c:3878 device_unregister+0x2c/0xcc drivers/base/core.c:3919 nsim_bus_dev_del drivers/net/netdevsim/bus.c:483 [inline] del_device_store+0x27c/0x31c drivers/net/netdevsim/bus.c:244 bus_attr_store+0x80/0xa4 drivers/base/bus.c:172 sysfs_kf_write+0x1a8/0x23c fs/sysfs/file.c:142 kernfs_fop_write_iter+0x33c/0x4d0 fs/kernfs/file.c:352 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x540/0xa3c fs/read_write.c:686 ksys_write+0x120/0x210 fs/read_write.c:738 __do_sys_write fs/read_write.c:749 [inline] __se_sys_write fs/read_write.c:746 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:746 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:746 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596