BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 0 UID: 0 PID: 8857 Comm: syz-executor Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026
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:3871 [inline]
 validate_chain kernel/locking/lockdep.c:3892 [inline]
 __lock_acquire+0xe64/0x2a6c kernel/locking/lockdep.c:5254
 lock_acquire+0x150/0x370 kernel/locking/lockdep.c:5908
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:155 [inline]
 _raw_spin_lock_irqsave+0x5c/0x7c kernel/locking/spinlock.c:181
 barn_get_empty_sheaf+0x2c/0xec mm/slub.c:3151
 __pcs_replace_empty_main+0x190/0x4f4 mm/slub.c:4758
 alloc_from_pcs mm/slub.c:4850 [inline]
 slab_alloc_node mm/slub.c:4984 [inline]
 __kmalloc_cache_noprof+0x37c/0x5fc mm/slub.c:5559
 _kmalloc_noprof include/linux/slab.h:991 [inline]
 _kzalloc_noprof include/linux/slab.h:1312 [inline]
 nf_nat_masq_schedule+0x2e8/0x680 net/netfilter/nf_nat_masquerade.c:118
 masq_device_event+0xa4/0xe8 net/netfilter/nf_nat_masquerade.c:162
 notifier_call_chain+0x1a4/0x624 kernel/notifier.c:85
 raw_notifier_call_chain+0x3c/0x50 kernel/notifier.c:453
 call_netdevice_notifiers_info+0xb8/0x120 net/core/dev.c:2275
 call_netdevice_notifiers_extack net/core/dev.c:2313 [inline]
 call_netdevice_notifiers net/core/dev.c:2327 [inline]
 netif_close_many+0x368/0x51c net/core/dev.c:1829
 netif_close_many_and_unlock+0x38/0x15c net/core/dev.c:12411
 unregister_netdevice_many_notify+0x5a4/0x1760 net/core/dev.c:12481
 unregister_netdevice_many net/core/dev.c:12589 [inline]
 unregister_netdevice_queue+0x274/0x30c net/core/dev.c:12390
 unregister_netdevice include/linux/netdevice.h:3487 [inline]
 nsim_destroy+0x248/0x5f8 drivers/net/netdevsim/netdev.c:1198
 __nsim_dev_port_del+0x13c/0x1ec drivers/net/netdevsim/dev.c:1472
 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1486 [inline]
 nsim_dev_reload_destroy+0x13c/0x210 drivers/net/netdevsim/dev.c:1710
 nsim_drv_remove+0x5c/0x114 drivers/net/netdevsim/dev.c:1725
 nsim_bus_remove+0x20/0x30 drivers/net/netdevsim/bus.c:427
 device_remove+0xc4/0x134 drivers/base/dd.c:616
 __device_release_driver drivers/base/dd.c:1349 [inline]
 device_release_driver_internal+0x124/0x20c drivers/base/dd.c:1372
 device_release_driver+0x28/0x38 drivers/base/dd.c:1395
 bus_remove_device+0x2d0/0x400 drivers/base/bus.c:664
 device_del+0x3ec/0x71c drivers/base/core.c:3965
 device_unregister+0x2c/0xf0 drivers/base/core.c:4006
 nsim_bus_dev_del+0x60/0x8c drivers/net/netdevsim/bus.c:488
 del_device_store+0x24c/0x2d4 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:145
 kernfs_fop_write_iter+0x260/0x3b8 fs/kernfs/file.c:345
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x51c/0xa0c fs/read_write.c:687
 ksys_write+0x12c/0x228 fs/read_write.c:739
 __do_sys_write fs/read_write.c:750 [inline]
 __se_sys_write fs/read_write.c:747 [inline]
 __arm64_sys_write+0x84/0x98 fs/read_write.c:747
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758
 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590
netdevsim netdevsim9 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim9 netdevsim0: renamed from eth0
8021q: adding VLAN 0 to HW filter on device netdevsim0
netdevsim netdevsim9 netdevsim1: renamed from eth1
8021q: adding VLAN 0 to HW filter on device netdevsim1
netdevsim netdevsim9 netdevsim2: renamed from eth2
8021q: adding VLAN 0 to HW filter on device netdevsim2
netdevsim netdevsim9 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 phy201: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy202: Selected rate control algorithm 'minstrel_ht'
EXT4-fs error (device loop9): ext4_validate_block_bitmap:436: comm syz-executor: bg 0: block 2: invalid block bitmap
EXT4-fs (loop9): Remounting filesystem read-only