================================================================================ UBSAN: object-size-mismatch in ./include/linux/skbuff.h:2048:28 member access within address ffffc900000074c0 with insufficient space for an object of type 'struct sk_buff' CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.15.0-rc5-syzkaller-00376-gcf52ad5ff16c-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 ubsan_epilogue lib/ubsan.c:151 [inline] handle_object_size_mismatch lib/ubsan.c:232 [inline] ubsan_type_mismatch_common+0x1e6/0x390 lib/ubsan.c:245 __ubsan_handle_type_mismatch_v1+0x4a/0x60 lib/ubsan.c:274 __skb_queue_before include/linux/skbuff.h:2048 [inline] __skb_queue_tail include/linux/skbuff.h:2081 [inline] wg_xmit+0x565/0xda0 drivers/net/wireguard/device.c:182 __netdev_start_xmit include/linux/netdevice.h:4988 [inline] netdev_start_xmit+0x7b/0x140 include/linux/netdevice.h:5002 xmit_one net/core/dev.c:3576 [inline] dev_hard_start_xmit+0x182/0x2e0 net/core/dev.c:3592 __dev_queue_xmit+0x1497/0x2140 net/core/dev.c:4202 neigh_output include/net/neighbour.h:510 [inline] ip6_finish_output2+0xf45/0x1300 net/ipv6/ip6_output.c:126 dst_output include/net/dst.h:450 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] ndisc_send_skb+0x8c3/0xdd0 net/ipv6/ndisc.c:508 addrconf_rs_timer+0x38c/0x5f0 net/ipv6/addrconf.c:3893 call_timer_fn+0xf6/0x210 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1466 [inline] __run_timers+0x685/0x7e0 kernel/time/timer.c:1734 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1747 __do_softirq+0x382/0x793 kernel/softirq.c:558 __irq_exit_rcu+0xec/0x170 kernel/softirq.c:636 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648 sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:22 [inline] RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline] RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:132 [inline] RIP: 0010:acpi_safe_halt+0xbc/0x160 drivers/acpi/processor_idle.c:110 Code: 83 e6 08 31 ff e8 24 39 89 f8 48 83 e3 08 75 73 4c 8d 64 24 20 e8 a4 1b 8f f8 eb 0c e8 4d 34 89 f8 0f 00 2d 16 3b c6 00 fb f4 <4c> 89 e3 48 c1 eb 03 42 80 3c 33 00 74 08 4c 89 e7 e8 9e c6 c8 f8 RSP: 0018:ffffffff8b407bc0 EFLAGS: 00000282 RAX: d4f825addbe56c00 RBX: 0000000000000000 RCX: ffffffff8f975703 RDX: ffffffff8b4bbf58 RSI: ffffffff894c55a0 RDI: ffffffff89a4bbe0 RBP: ffffffff8b407c40 R08: ffffffff81787bf0 R09: fffffbfff16976a9 R10: fffffbfff16976a9 R11: 1ffffffff16976a8 R12: ffffffff8b407be0 R13: ffff8880157d0064 R14: dffffc0000000000 R15: 1ffffffff1680f78 acpi_idle_enter+0x371/0x520 drivers/acpi/processor_idle.c:688 cpuidle_enter_state+0x2a8/0xaf0 drivers/cpuidle/cpuidle.c:237 cpuidle_enter+0x59/0x90 drivers/cpuidle/cpuidle.c:351 cpuidle_idle_call kernel/sched/idle.c:239 [inline] do_idle+0x389/0x590 kernel/sched/idle.c:306 cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:403 start_kernel+0x4b9/0x568 init/main.c:1142 secondary_startup_64_no_verify+0xb1/0xbb ================================================================================ ---------------- Code disassembly (best guess): 0: 83 e6 08 and $0x8,%esi 3: 31 ff xor %edi,%edi 5: e8 24 39 89 f8 callq 0xf889392e a: 48 83 e3 08 and $0x8,%rbx e: 75 73 jne 0x83 10: 4c 8d 64 24 20 lea 0x20(%rsp),%r12 15: e8 a4 1b 8f f8 callq 0xf88f1bbe 1a: eb 0c jmp 0x28 1c: e8 4d 34 89 f8 callq 0xf889346e 21: 0f 00 2d 16 3b c6 00 verw 0xc63b16(%rip) # 0xc63b3e 28: fb sti 29: f4 hlt * 2a: 4c 89 e3 mov %r12,%rbx <-- trapping instruction 2d: 48 c1 eb 03 shr $0x3,%rbx 31: 42 80 3c 33 00 cmpb $0x0,(%rbx,%r14,1) 36: 74 08 je 0x40 38: 4c 89 e7 mov %r12,%rdi 3b: e8 9e c6 c8 f8 callq 0xf8c8c6de