skbuff: skb_under_panic: text:ffffffff88740834 len:74 put:14 head:ffff888060e1d800 data:ffff888060e1d7f2 tail:0x3c end:0xc0 dev:syz_tun ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:112! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 13138 Comm: syz.5.2541 Not tainted 5.15.175-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:skb_panic net/core/skbuff.c:112 [inline] RIP: 0010:skb_under_panic+0x143/0x150 net/core/skbuff.c:122 Code: 04 9e 8b 48 c7 c6 93 da 55 8c 48 8b 54 24 08 8b 0c 24 44 8b 44 24 04 4d 89 e9 55 41 54 41 57 41 56 e8 e1 cd ed 01 48 83 c4 20 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 90 55 41 57 41 56 41 55 41 54 RSP: 0018:ffffc90003f7ea70 EFLAGS: 00010282 RAX: 0000000000000087 RBX: dffffc0000000000 RCX: d1a4c989a1983f00 RDX: ffffc900132d9000 RSI: 0000000000004c88 RDI: 0000000000004c89 RBP: ffff8880722c4000 R08: ffffffff8166aa6c R09: fffffbfff1c14c0e R10: 0000000000000000 R11: dffffc0000000001 R12: 00000000000000c0 R13: ffff888060e1d800 R14: ffff888060e1d7f2 R15: 000000000000003c FS: 00007f255acbb6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2e01dff8 CR3: 00000000645bd000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: skb_push+0xdd/0x100 net/core/skbuff.c:2053 eth_header+0x34/0x1e0 net/ethernet/eth.c:82 dev_hard_header include/linux/netdevice.h:3288 [inline] nf_send_reset6+0xd20/0x1250 net/ipv6/netfilter/nf_reject_ipv6.c:354 nft_reject_inet_eval+0x3b5/0x680 net/netfilter/nft_reject_inet.c:48 expr_call_ops_eval net/netfilter/nf_tables_core.c:198 [inline] nft_do_chain+0x467/0x16b0 net/netfilter/nf_tables_core.c:238 nft_do_chain_inet+0x3f8/0x680 net/netfilter/nft_chain_filter.c:161 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline] nf_hook_slow+0xae/0x1e0 net/netfilter/core.c:584 nf_hook include/linux/netfilter.h:257 [inline] NF_HOOK include/linux/netfilter.h:300 [inline] br_nf_pre_routing_ipv6+0x5fa/0x720 net/bridge/br_netfilter_ipv6.c:237 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline] nf_hook_bridge_pre net/bridge/br_input.c:242 [inline] br_handle_frame+0x8a8/0x10e0 net/bridge/br_input.c:384 __netif_receive_skb_core+0x13b9/0x3df0 net/core/dev.c:5387 __netif_receive_skb_one_core net/core/dev.c:5491 [inline] __netif_receive_skb+0x11c/0x530 net/core/dev.c:5607 netif_receive_skb_internal net/core/dev.c:5693 [inline] netif_receive_skb+0x1b4/0x760 net/core/dev.c:5752 tun_rx_batched+0x6bc/0x860 tun_get_user+0x2a1c/0x40f0 drivers/net/tun.c:1989 tun_chr_write_iter+0x10c/0x1e0 drivers/net/tun.c:2019 call_write_iter include/linux/fs.h:2174 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0xacd/0xe50 fs/read_write.c:594 ksys_write+0x1a2/0x2c0 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f255ce497df Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48 RSP: 002b:00007f255acbb000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f255d03afa0 RCX: 00007f255ce497df RDX: 000000000000004a RSI: 0000000020000000 RDI: 00000000000000c8 RBP: 00007f255cec6aa8 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000004a R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f255d03afa0 R15: 00007ffcdf585308 Modules linked in: ---[ end trace cb07572b19d45d67 ]--- RIP: 0010:skb_panic net/core/skbuff.c:112 [inline] RIP: 0010:skb_under_panic+0x143/0x150 net/core/skbuff.c:122 Code: 04 9e 8b 48 c7 c6 93 da 55 8c 48 8b 54 24 08 8b 0c 24 44 8b 44 24 04 4d 89 e9 55 41 54 41 57 41 56 e8 e1 cd ed 01 48 83 c4 20 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 90 55 41 57 41 56 41 55 41 54 RSP: 0018:ffffc90003f7ea70 EFLAGS: 00010282 RAX: 0000000000000087 RBX: dffffc0000000000 RCX: d1a4c989a1983f00 RDX: ffffc900132d9000 RSI: 0000000000004c88 RDI: 0000000000004c89 RBP: ffff8880722c4000 R08: ffffffff8166aa6c R09: fffffbfff1c14c0e R10: 0000000000000000 R11: dffffc0000000001 R12: 00000000000000c0 R13: ffff888060e1d800 R14: ffff888060e1d7f2 R15: 000000000000003c FS: 00007f255acbb6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2e01dff8 CR3: 00000000645bd000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400