------------[ cut here ]------------
WARNING: CPU: 1 PID: 20004 at net/core/flow_dissector.c:1107 __skb_flow_dissect+0xb05/0x6e70 net/core/flow_dissector.c:1102
Modules linked in:
CPU: 1 PID: 20004 Comm: syz.5.4796 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:__skb_flow_dissect+0xb05/0x6e70 net/core/flow_dissector.c:1107
Code: c6 e8 7f 41 06 f9 85 db 0f 84 9a 06 00 00 80 3d a4 c1 f5 05 01 0f 85 c0 06 00 00 e8 b5 3d 06 f9 e9 d5 f9 ff ff e8 ab 3d 06 f9 <0f> 0b e8 b4 6b 0e 02 89 c3 31 ff 89 c6 e8 49 41 06 f9 85 db 74 18
RSP: 0000:ffffc900001ef940 EFLAGS: 00010246
RAX: ffffffff888134c5 RBX: 0000000000000000 RCX: ffff88807c3c8000
RDX: 0000000000000100 RSI: ffffffff8b1d3340 RDI: ffffffff8b1d3300
RBP: ffffc900001eff58 R08: dffffc0000000000 R09: 1ffffffff223dea0
R10: dffffc0000000000 R11: fffffbfff223dea1 R12: ffffffff8e8cf8f8
R13: 1ffffffff1d19f20 R14: ffffffff8e8cf902 R15: dffffc0000000000
FS:  00007f90941b06c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000bea000 CR3: 00000000669e0000 CR4: 00000000003506e0
Call Trace:
 <IRQ>
 skb_flow_dissect_flow_keys include/linux/skbuff.h:1544 [inline]
 ___skb_get_hash net/core/flow_dissector.c:1806 [inline]
 __skb_get_hash+0xf3/0x2e0 net/core/flow_dissector.c:1871
 skb_get_hash include/linux/skbuff.h:1586 [inline]
 nft_trace_init+0x1bb/0x420 net/netfilter/nf_tables_trace.c:316
 nft_do_chain+0x1523/0x1620 net/netfilter/nf_tables_core.c:268
 nft_do_chain_ipv4+0x160/0x230 net/netfilter/nft_chain_filter.c:23
 nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline]
 nf_hook_slow+0xbd/0x200 net/netfilter/core.c:626
 nf_hook+0x228/0x390 include/linux/netfilter.h:259
 __ip_local_out+0x4db/0x5f0 net/ipv4/ip_output.c:118
 ip_local_out+0x2a/0x130 net/ipv4/ip_output.c:127
 iptunnel_xmit+0x4d0/0x910 net/ipv4/ip_tunnel_core.c:82
 udp_tunnel_xmit_skb+0x22f/0x380 net/ipv4/udp_tunnel_core.c:172
 tipc_udp_xmit+0x861/0xb40 net/tipc/udp_media.c:198
 tipc_udp_send_msg+0x27e/0x3e0 net/tipc/udp_media.c:271
 tipc_bearer_xmit_skb+0x2ad/0x3f0 net/tipc/bearer.c:576
 tipc_disc_timeout+0x5f7/0x750 net/tipc/discover.c:340
 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x570/0x810 kernel/time/timer.c:2023
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x27d/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:lock_acquire+0x208/0x420 kernel/locking/lockdep.c:5758
Code: f7 84 24 80 00 00 00 00 02 00 00 43 c6 44 3c 04 f8 0f 85 f0 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 04 3c 00 00 00 00 43 c7 44 3c 08 00 00 00 00 65 48 8b 04 25
RSP: 0000:ffffc90004e0f600 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 502fef9c5656a900
RDX: 0000000000000000 RSI: ffffffff8acadd60 RDI: ffffffff8b1d3360
RBP: ffffc90004e0f718 R08: dffffc0000000000 R09: 1ffffffff223deb4
R10: dffffc0000000000 R11: fffffbfff223deb5 R12: 1ffff920009c1ecc
R13: ffff88803025ce80 R14: 0000000000000246 R15: dffffc0000000000
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:351 [inline]
 unix_dgram_sendmsg+0x96b/0x16e0 net/unix/af_unix.c:2044
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0x61b/0x980 net/socket.c:2595
 ___sys_sendmsg+0x2a6/0x360 net/socket.c:2649
 __sys_sendmmsg+0x2ca/0x510 net/socket.c:2735
 __do_sys_sendmmsg net/socket.c:2764 [inline]
 __se_sys_sendmmsg net/socket.c:2761 [inline]
 __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2761
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f909339e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f90941b0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f9093625fa0 RCX: 00007f909339e159
RDX: 0400000000000041 RSI: 0000200000000000 RDI: 0000000000000005
RBP: 00007f9093435024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9093626038 R14: 00007f9093625fa0 R15: 00007ffcf00e6228
 </TASK>
----------------
Code disassembly (best guess):
   0:	f7 84 24 80 00 00 00 	testl  $0x200,0x80(%rsp)
   7:	00 02 00 00
   b:	43 c6 44 3c 04 f8    	movb   $0xf8,0x4(%r12,%r15,1)
  11:	0f 85 f0 00 00 00    	jne    0x107
  17:	41 f7 c6 00 02 00 00 	test   $0x200,%r14d
  1e:	74 01                	je     0x21
  20:	fb                   	sti
  21:	48 c7 44 24 60 0e 36 	movq   $0x45e0360e,0x60(%rsp)
  28:	e0 45
* 2a:	4b c7 04 3c 00 00 00 	movq   $0x0,(%r12,%r15,1) <-- trapping instruction
  31:	00
  32:	43 c7 44 3c 08 00 00 	movl   $0x0,0x8(%r12,%r15,1)
  39:	00 00
  3b:	65                   	gs
  3c:	48                   	rex.W
  3d:	8b                   	.byte 0x8b
  3e:	04 25                	add    $0x25,%al