BUG: MAX_LOCKDEP_CHAINS too low! turning off the locking correctness validator. CPU: 1 UID: 0 PID: 8587 Comm: syz-executor Not tainted syzkaller #0 PREEMPT 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 local_lock_acquire include/linux/local_lock_internal.h:46 [inline] napi_skb_cache_get+0x248/0x8c0 net/core/skbuff.c:289 __alloc_skb+0x1b8/0x5f8 net/core/skbuff.c:696 alloc_skb include/linux/skbuff.h:1383 [inline] nlmsg_new include/net/netlink.h:1055 [inline] inet6_ifmcaddr_notify+0xe8/0x1d4 net/ipv6/mcast.c:909 __ipv6_dev_mc_dec+0x288/0x2e4 net/ipv6/mcast.c:1002 ipv6_mc_destroy_dev+0x2c4/0x50c net/ipv6/mcast.c:2844 addrconf_ifdown+0xd7c/0x1198 net/ipv6/addrconf.c:4008 addrconf_notify+0x2c0/0xbe4 net/ipv6/addrconf.c:-1 notifier_call_chain+0x194/0x60c kernel/notifier.c:85 raw_notifier_call_chain+0x3c/0x50 kernel/notifier.c:453 call_netdevice_notifiers_info+0xb8/0x120 net/core/dev.c:2249 call_netdevice_notifiers_extack net/core/dev.c:2287 [inline] call_netdevice_notifiers net/core/dev.c:2301 [inline] unregister_netdevice_many_notify+0xf2c/0x18d8 net/core/dev.c:12421 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+0x234/0x5ec 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:740 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:759 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 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 netdevsim netdevsim0 netdevsim0: renamed from eth0 8021q: adding VLAN 0 to HW filter on device netdevsim0 netdevsim netdevsim0 netdevsim1: renamed from eth1 8021q: adding VLAN 0 to HW filter on device netdevsim1 netdevsim netdevsim0 netdevsim2: renamed from eth2 8021q: adding VLAN 0 to HW filter on device netdevsim2 netdevsim netdevsim0 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 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 phy191: Selected rate control algorithm 'minstrel_ht' ieee80211 phy192: Selected rate control algorithm 'minstrel_ht' EXT4-fs error (device loop0): ext4_readdir:225: inode #11: comm syz-executor: path /0/file1/lost+found: directory fails checksum at offset 1024 EXT4-fs error (device loop0): ext4_empty_dir:3114: inode #11: block 1: comm syz-executor: Directory block failed checksum EXT4-fs error (device loop0): ext4_readdir:225: inode #11: comm syz-executor: path /0/file1/lost+found: directory fails checksum at offset 1024 EXT4-fs error (device loop0): ext4_empty_dir:3114: inode #11: block 1: comm syz-executor: Directory block failed checksum EXT4-fs error (device loop0): ext4_readdir:225: inode #11: comm syz-executor: path /0/file1/lost+found: directory fails checksum at offset 1024 EXT4-fs error (device loop0): ext4_empty_dir:3114: inode #11: block 1: comm syz-executor: Directory block failed checksum EXT4-fs error (device loop0): ext4_readdir:225: inode #11: comm syz-executor: path /0/file1/lost+found: directory fails checksum at offset 1024 EXT4-fs error (device loop0): ext4_empty_dir:3114: inode #11: block 1: comm syz-executor: Directory block failed checksum EXT4-fs error (device loop0): ext4_readdir:225: inode #11: comm syz-executor: path /0/file1/lost+found: directory fails checksum at offset 1024 EXT4-fs error (device loop0): ext4_empty_dir:3114: inode #11: block 1: comm syz-executor: Directory block failed checksum