BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 1 PID: 8100 Comm: syz.8.1052 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
Call trace:
 dump_backtrace+0x1c0/0x1ec 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+0xf4/0x15c 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+0x1864/0x6800 kernel/locking/lockdep.c:5049
 lock_acquire+0x20c/0x63c kernel/locking/lockdep.c:5662
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
 _raw_spin_lock_bh+0x54/0x6c kernel/locking/spinlock.c:178
 spin_lock_bh include/linux/spinlock.h:356 [inline]
 nf_nat_cleanup_conntrack+0x6c/0x128 net/netfilter/nf_nat_core.c:809
 nf_conntrack_free+0x1d0/0x380 net/netfilter/nf_conntrack_core.c:1712
 nf_ct_destroy+0x150/0x28c net/netfilter/nf_conntrack_core.c:611
 nf_ct_put include/net/netfilter/nf_conntrack.h:190 [inline]
 nf_ct_gc_expired+0x284/0x388 net/netfilter/nf_conntrack_core.c:739
 ____nf_conntrack_find net/netfilter/nf_conntrack_core.c:765 [inline]
 __nf_conntrack_find_get+0x244/0x638 net/netfilter/nf_conntrack_core.c:795
 resolve_normal_ct net/netfilter/nf_conntrack_core.c:1864 [inline]
 nf_conntrack_in+0x564/0x1970 net/netfilter/nf_conntrack_core.c:2031
 ipv4_conntrack_local+0x108/0x1fc net/netfilter/nf_conntrack_proto.c:213
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0xb4/0x1f4 net/netfilter/core.c:614
 nf_hook+0x1d0/0x338 include/linux/netfilter.h:257
 __ip_local_out+0x4b8/0x608 net/ipv4/ip_output.c:115
 ip_local_out+0x3c/0x15c net/ipv4/ip_output.c:124
 iptunnel_xmit+0x3cc/0x850 net/ipv4/ip_tunnel_core.c:82
 udp_tunnel_xmit_skb+0x1b0/0x2c4 net/ipv4/udp_tunnel_core.c:172
 geneve_xmit_skb drivers/net/geneve.c:1012 [inline]
 geneve_xmit+0x2310/0x2fc8 drivers/net/geneve.c:1125
 __netdev_start_xmit include/linux/netdevice.h:4896 [inline]
 netdev_start_xmit include/linux/netdevice.h:4910 [inline]
 xmit_one net/core/dev.c:3683 [inline]
 dev_hard_start_xmit+0x234/0x8cc net/core/dev.c:3699
 __dev_queue_xmit+0x1594/0x3134 net/core/dev.c:4359
 dev_queue_xmit include/linux/netdevice.h:3051 [inline]
 neigh_resolve_output+0x550/0x650 net/core/neighbour.c:1568
 neigh_output include/net/neighbour.h:545 [inline]
 ip6_finish_output2+0xd5c/0x1840 net/ipv6/ip6_output.c:138
 __ip6_finish_output net/ipv6/ip6_output.c:205 [inline]
 ip6_finish_output+0x594/0x92c net/ipv6/ip6_output.c:216
 NF_HOOK_COND include/linux/netfilter.h:291 [inline]
 ip6_output+0x274/0x500 net/ipv6/ip6_output.c:237
 dst_output include/net/dst.h:453 [inline]
 NF_HOOK include/linux/netfilter.h:302 [inline]
 ndisc_send_skb+0xc30/0x164c net/ipv6/ndisc.c:513
 ndisc_send_rs+0x37c/0x518 net/ipv6/ndisc.c:723
 addrconf_rs_timer+0x23c/0x54c net/ipv6/addrconf.c:3979
 call_timer_fn+0x1b8/0x95c kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x478/0x6f0 kernel/time/timer.c:2023
 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:2036
 handle_softirqs+0x318/0xc60 kernel/softirq.c:596
 __do_softirq+0x14/0x20 kernel/softirq.c:630
 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80
 call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:897
 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:85
 invoke_softirq kernel/softirq.c:477 [inline]
 __irq_exit_rcu+0x23c/0x438 kernel/softirq.c:679
 irq_exit_rcu+0x14/0x84 kernel/softirq.c:691
 __el1_irq arch/arm64/kernel/entry-common.c:472 [inline]
 el1_interrupt+0x38/0x54 arch/arm64/kernel/entry-common.c:486
 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:491
 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:581
 arch_local_irq_restore arch/arm64/include/asm/irqflags.h:122 [inline]
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
 _raw_spin_unlock_irqrestore+0x58/0xac kernel/locking/spinlock.c:194
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 __folio_start_writeback+0x658/0xa7c mm/page-writeback.c:3022
 set_page_writeback+0x5c/0x7c mm/folio-compat.c:56
 __mpage_writepage+0xe0c/0x12bc fs/mpage.c:609
 write_cache_pages+0x74c/0xde8 mm/page-writeback.c:2382
 mpage_writepages+0xec/0x1a8 fs/mpage.c:664
 fat_writepages+0x30/0x40 fs/fat/inode.c:205
 do_writepages+0x2b0/0x504 mm/page-writeback.c:2491
 filemap_fdatawrite_wbc+0x124/0x174 mm/filemap.c:388
 __filemap_fdatawrite_range mm/filemap.c:421 [inline]
 file_write_and_wait_range+0x11c/0x1f4 mm/filemap.c:774
 __generic_file_fsync+0x78/0x190 fs/libfs.c:1132
 fat_file_fsync+0x7c/0x180 fs/fat/file.c:191
 vfs_fsync_range+0x168/0x188 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2962 [inline]
 generic_file_write_iter+0x224/0x2b0 mm/filemap.c:3993
 do_iter_readv_writev fs/read_write.c:-1 [inline]
 do_iter_write+0x53c/0x940 fs/read_write.c:861
 vfs_writev fs/read_write.c:934 [inline]
 do_pwritev+0x1e8/0x338 fs/read_write.c:1031
 __do_sys_pwritev2 fs/read_write.c:1090 [inline]
 __se_sys_pwritev2 fs/read_write.c:1081 [inline]
 __arm64_sys_pwritev2+0xd4/0x108 fs/read_write.c:1081
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 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
vkms_vblank_simulate: vblank timer overrun