BUG: MAX_LOCKDEP_CHAINS too low! turning off the locking correctness validator. CPU: 0 PID: 9484 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 Call trace: dump_backtrace+0x1c8/0x1f4 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+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:3772 [inline] validate_chain kernel/locking/lockdep.c:3793 [inline] __lock_acquire+0x1b40/0x6544 kernel/locking/lockdep.c:5049 lock_acquire+0x20c/0x644 kernel/locking/lockdep.c:5662 down_read+0x64/0x304 kernel/locking/rwsem.c:1520 acpi_get_bus_type drivers/acpi/glue.c:66 [inline] acpi_device_notify+0x54/0x38c drivers/acpi/glue.c:359 device_platform_notify drivers/base/core.c:2322 [inline] device_add+0x418/0xf94 drivers/base/core.c:3639 netdev_register_kobject+0x158/0x2d4 net/core/net-sysfs.c:2013 register_netdevice+0xef8/0x15cc net/core/dev.c:10204 nsim_init_netdevsim drivers/net/netdevsim/netdev.c:317 [inline] nsim_create+0x2bc/0x364 drivers/net/netdevsim/netdev.c:365 __nsim_dev_port_add+0x510/0x898 drivers/net/netdevsim/dev.c:1396 nsim_dev_port_add_all+0x4c/0x110 drivers/net/netdevsim/dev.c:1454 nsim_drv_probe+0x6b0/0x930 drivers/net/netdevsim/dev.c:1608 nsim_bus_probe+0x20/0x30 drivers/net/netdevsim/bus.c:239 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x39c/0xae0 drivers/base/dd.c:639 __driver_probe_device+0x180/0x314 drivers/base/dd.c:785 driver_probe_device+0x78/0x330 drivers/base/dd.c:815 __device_attach_driver+0x290/0x4e0 drivers/base/dd.c:943 bus_for_each_drv+0x150/0x1d8 drivers/base/bus.c:429 __device_attach+0x2a8/0x3d4 drivers/base/dd.c:1015 device_initial_probe+0x24/0x34 drivers/base/dd.c:1064 bus_probe_device+0xbc/0x1c4 drivers/base/bus.c:489 device_add+0xb04/0xf94 drivers/base/core.c:3697 device_register+0x28/0x38 drivers/base/core.c:3779 nsim_bus_dev_new drivers/net/netdevsim/bus.c:290 [inline] new_device_store+0x2c0/0x4f4 drivers/net/netdevsim/bus.c:167 bus_attr_store+0x80/0xa4 drivers/base/bus.c:124 sysfs_kf_write+0x1f8/0x278 fs/sysfs/file.c:136 kernfs_fop_write_iter+0x320/0x478 fs/kernfs/file.c:334 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x5ac/0x7c4 fs/read_write.c:584 ksys_write+0x120/0x210 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:646 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 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 netdevsim netdevsim9 netdevsim0: renamed from eth0 netdevsim netdevsim9 netdevsim1: renamed from eth1 netdevsim netdevsim9 netdevsim2: renamed from eth2 netdevsim netdevsim9 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: 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: batadv0: Interface activated: batadv_slave_1 netdevsim netdevsim9 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim9 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim9 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim9 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 ieee80211 phy23: Selected rate control algorithm 'minstrel_ht' ieee80211 phy24: Selected rate control algorithm 'minstrel_ht'