syzbot

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kernel BUG at net/netfilter/nf_conntrack_core.c:570!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 13384 Comm: syz.2.3196 Not tainted 5.15.186-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:nf_ct_del_from_dying_or_unconfirmed_list net/netfilter/nf_conntrack_core.c:570 [inline]
RIP: 0010:__nf_conntrack_confirm+0x109d/0x10a0 net/netfilter/nf_conntrack_core.c:1207
Code: fc ff ff e8 95 e0 68 f9 48 c7 c7 10 f8 63 8d 48 c7 c6 c0 6a 03 8b 48 8b 54 24 08 e8 2d b5 e8 fb e9 fa f1 ff ff e8 73 e0 68 f9 <0f> 0b 90 55 41 57 41 56 41 55 41 54 53 48 89 fb 48 bd 00 00 00 00
RSP: 0018:ffffc90003a7f4a0 EFLAGS: 00010287
RAX: ffffffff880ee29d RBX: ffffe8ffffc25b90 RCX: 0000000000080000
RDX: ffffc900059e9000 RSI: 0000000000000834 RDI: 0000000000000835
RBP: ffff88807ecc7c00 R08: 0000000000000004 R09: 0000000000000003
R10: fffff5200074fe84 R11: 1ffff9200074fe84 R12: 00000000000173a8
R13: 0000000000000000 R14: ffff88807ecc7c58 R15: 0000000000000000
FS:  00007f5eeb2a16c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000301 CR3: 0000000064db9000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 nf_conntrack_confirm include/net/netfilter/nf_conntrack_core.h:62 [inline]
 nf_confirm+0x381/0x4b0 net/netfilter/nf_conntrack_proto.c:154
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0xb9/0x200 net/netfilter/core.c:584
 nf_hook include/linux/netfilter.h:257 [inline]
 NF_HOOK+0x1cb/0x360 include/linux/netfilter.h:300
 NF_HOOK+0x2d6/0x360 include/linux/netfilter.h:302
 __netif_receive_skb_one_core net/core/dev.c:5525 [inline]
 __netif_receive_skb+0xcc/0x290 net/core/dev.c:5639
 netif_receive_skb_internal net/core/dev.c:5725 [inline]
 netif_receive_skb+0x19e/0x6c0 net/core/dev.c:5784
 tun_rx_batched+0x5a1/0x6d0 drivers/net/tun.c:-1
 tun_get_user+0x23f0/0x38d0 drivers/net/tun.c:1989
 tun_chr_write_iter+0x112/0x1e0 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+0x712/0xd00 fs/read_write.c:594
 ksys_write+0x14d/0x250 fs/read_write.c:647
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f5eed4383df
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:00007f5eeb2a1000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f5eed660fa0 RCX: 00007f5eed4383df
RDX: 000000000000003e RSI: 0000200000000300 RDI: 00000000000000c8
RBP: 00007f5eed4bbb39 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000003e R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f5eed660fa0 R15: 00007ffd2c8f9648
 </TASK>
Modules linked in:
---[ end trace ece25448824b33b1 ]---
RIP: 0010:nf_ct_del_from_dying_or_unconfirmed_list net/netfilter/nf_conntrack_core.c:570 [inline]
RIP: 0010:__nf_conntrack_confirm+0x109d/0x10a0 net/netfilter/nf_conntrack_core.c:1207
Code: fc ff ff e8 95 e0 68 f9 48 c7 c7 10 f8 63 8d 48 c7 c6 c0 6a 03 8b 48 8b 54 24 08 e8 2d b5 e8 fb e9 fa f1 ff ff e8 73 e0 68 f9 <0f> 0b 90 55 41 57 41 56 41 55 41 54 53 48 89 fb 48 bd 00 00 00 00
RSP: 0018:ffffc90003a7f4a0 EFLAGS: 00010287
RAX: ffffffff880ee29d RBX: ffffe8ffffc25b90 RCX: 0000000000080000
RDX: ffffc900059e9000 RSI: 0000000000000834 RDI: 0000000000000835
RBP: ffff88807ecc7c00 R08: 0000000000000004 R09: 0000000000000003
R10: fffff5200074fe84 R11: 1ffff9200074fe84 R12: 00000000000173a8
R13: 0000000000000000 R14: ffff88807ecc7c58 R15: 0000000000000000
FS:  00007f5eeb2a16c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000301 CR3: 0000000064db9000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400