================================================================================
UBSAN: signed-integer-overflow in ./arch/x86/include/asm/atomic.h:165:11
1205929607 + 1200518688 cannot be represented in type 'int'
CPU: 1 PID: 132 Comm: kworker/u4:4 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: wg-kex-wg0 wg_packet_handshake_send_worker
Call Trace:
 <IRQ>
 dump_stack+0xfd/0x16e lib/dump_stack.c:118
 ubsan_epilogue+0xa/0x30 lib/ubsan.c:148
 handle_overflow+0x18e/0x1a0 lib/ubsan.c:180
 arch_atomic_add_return arch/x86/include/asm/atomic.h:165 [inline]
 atomic_add_return include/asm-generic/atomic-instrumented.h:73 [inline]
 ip_idents_reserve+0x146/0x160 net/ipv4/route.c:521
 __ip_select_ident+0xe4/0x1b0 net/ipv4/route.c:538
 ip_select_ident_segs include/net/ip.h:525 [inline]
 ip_select_ident include/net/ip.h:532 [inline]
 __ip_make_skb+0xf73/0x19b0 net/ipv4/ip_output.c:1551
 ip_finish_skb include/net/ip.h:244 [inline]
 ip_push_pending_frames+0x27/0x80 net/ipv4/ip_output.c:1606
 __icmp_send+0xc1b/0xf60 net/ipv4/icmp.c:776
 icmp_send include/net/icmp.h:43 [inline]
 __udp4_lib_rcv+0x14e5/0x2070 net/ipv4/udp.c:2438
 ip_protocol_deliver_rcu+0x3ad/0x790 net/ipv4/ip_input.c:204
 ip_local_deliver_finish+0x1d5/0x330 net/ipv4/ip_input.c:231
 NF_HOOK+0x255/0x2c0 include/linux/netfilter.h:296
 NF_HOOK+0x255/0x2c0 include/linux/netfilter.h:296
 __netif_receive_skb_one_core net/core/dev.c:5395 [inline]
 __netif_receive_skb+0xcc/0x290 net/core/dev.c:5509
 process_backlog+0x4ef/0x6e0 net/core/dev.c:6416
 napi_poll net/core/dev.c:6867 [inline]
 net_rx_action+0x4ae/0xc20 net/core/dev.c:6937
 __do_softirq+0x263/0x914 kernel/softirq.c:298
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0x9b/0xe0 arch/x86/kernel/irq_64.c:77
 do_softirq+0xc4/0x100 kernel/softirq.c:343
 __local_bh_enable_ip+0x11b/0x160 kernel/softirq.c:195
 wg_socket_send_skb_to_peer+0x167/0x1c0 drivers/net/wireguard/socket.c:184
 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline]
 wg_packet_handshake_send_worker+0x16b/0x270 drivers/net/wireguard/send.c:51
 process_one_work+0x855/0xfd0 kernel/workqueue.c:2282
 worker_thread+0xa9b/0x1410 kernel/workqueue.c:2428
 kthread+0x320/0x3b0 kernel/kthread.c:328
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
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