------------[ cut here ]------------ kernel BUG at net/netfilter/nf_conntrack_core.c:570! Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 7988 Comm: syz.2.1743 Not tainted 5.15.189-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : nf_ct_del_from_dying_or_unconfirmed_list net/netfilter/nf_conntrack_core.c:570 [inline] pc : __nf_conntrack_confirm+0xd7c/0xde8 net/netfilter/nf_conntrack_core.c:1207 lr : nf_ct_del_from_dying_or_unconfirmed_list net/netfilter/nf_conntrack_core.c:570 [inline] lr : __nf_conntrack_confirm+0xd7c/0xde8 net/netfilter/nf_conntrack_core.c:1207 sp : ffff80001fba70f0 x29: ffff80001fba7170 x28: 0000000000000000 x27: dfff800000000000 x26: ffff0000cf22c0c8 x25: ffff0000cf22c0c0 x24: ffff0000cf22c0d0 x23: ffff0000cf22c000 x22: 000000000000b97e x21: 0000000000000000 x20: ffff80018d002000 x19: 0000000000000000 x18: 0000000000000200 x17: 0000000000000002 x16: ffff8000082d5f6c x15: 0000000000000003 x14: 0000000000ff0100 x13: 1ffff0000282e06b x12: 0000000000080000 x11: 000000000000155b x10: ffff8000227ea000 x9 : ffff80000faa0a20 x8 : 000000000000155c x7 : ffff80000fa9ff68 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff8000082d608c x2 : 0000000000000001 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: nf_ct_del_from_dying_or_unconfirmed_list net/netfilter/nf_conntrack_core.c:570 [inline] __nf_conntrack_confirm+0xd7c/0xde8 net/netfilter/nf_conntrack_core.c:1207 nf_conntrack_confirm include/net/netfilter/nf_conntrack_core.h:62 [inline] nf_confirm+0x364/0x4cc net/netfilter/nf_conntrack_proto.c:154 ipv4_confirm+0xec/0x1d0 net/netfilter/nf_conntrack_proto.c:169 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline] nf_hook_slow+0xb4/0x1f4 net/netfilter/core.c:584 nf_hook include/linux/netfilter.h:257 [inline] NF_HOOK+0x1c4/0x354 include/linux/netfilter.h:300 ip_local_deliver+0x120/0x194 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:462 [inline] ip_rcv_finish+0x228/0x260 net/ipv4/ip_input.c:447 NF_HOOK+0x2c0/0x354 include/linux/netfilter.h:302 ip_rcv+0x7c/0x9c net/ipv4/ip_input.c:566 __netif_receive_skb_one_core net/core/dev.c:5525 [inline] __netif_receive_skb+0xcc/0x2ac net/core/dev.c:5639 netif_receive_skb_internal net/core/dev.c:5725 [inline] netif_receive_skb+0x1cc/0x7e0 net/core/dev.c:5784 tun_rx_batched+0x478/0x5b4 drivers/net/tun.c:-1 tun_get_user+0x1f48/0x31c4 drivers/net/tun.c:1989 tun_chr_write_iter+0xfc/0x20c drivers/net/tun.c:2019 call_write_iter include/linux/fs.h:2172 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x7c8/0xa2c fs/read_write.c:594 ksys_write+0x120/0x210 fs/read_write.c:647 __do_sys_write fs/read_write.c:659 [inline] __se_sys_write fs/read_write.c:656 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:656 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Code: aa1703e2 96b811c9 17fffd2c 96276279 (d4210000) ---[ end trace c1146e624aa7645f ]---