general protection fault, probably for non-canonical address 0xdffffc000000005c: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000002e0-0x00000000000002e7] CPU: 0 PID: 27197 Comm: syz.3.7761 Tainted: G W 5.10.240-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2025 RIP: 0010:__in6_dev_get include/net/addrconf.h:355 [inline] RIP: 0010:ip6_ignore_linkdown include/net/addrconf.h:446 [inline] RIP: 0010:find_match+0xa7/0xd60 net/ipv6/route.c:739 Code: 41 80 7c 05 00 00 74 08 4c 89 f7 e8 13 96 a6 fd 41 bc e0 02 00 00 4d 03 26 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 e7 e8 eb 95 a6 fd 4d 8b 24 24 4d 85 e4 0f RSP: 0018:ffffc90000007070 EFLAGS: 00010206 RAX: 000000000000005c RBX: 0000000000000003 RCX: dffffc0000000000 RDX: ffff8881256f62c0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900000070f8 R08: ffffc90000007420 R09: ffffc90000007430 R10: fffff52000000ea6 R11: 1ffff92000000ea2 R12: 00000000000002e0 R13: 1ffff1102284c044 R14: ffff888114260220 R15: 0000000000000000 FS: 00007ff1896516c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000013c359000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rt6_nh_find_match+0xd9/0x140 net/ipv6/route.c:779 nexthop_for_each_fib6_nh+0xf6/0x1e0 net/ipv4/nexthop.c:602 __find_rr_leaf+0x50f/0x900 net/ipv6/route.c:820 find_rr_leaf net/ipv6/route.c:848 [inline] rt6_select net/ipv6/route.c:892 [inline] fib6_table_lookup+0x2f4/0x9f0 net/ipv6/route.c:2190 ip6_pol_route+0x145/0x1110 net/ipv6/route.c:2226 ip6_pol_route_output+0x51/0x80 net/ipv6/route.c:2475 pol_lookup_func include/net/ip6_fib.h:594 [inline] fib6_rule_lookup+0x2ef/0x560 net/ipv6/fib6_rules.c:120 ip6_route_output_flags_noref+0x248/0x2f0 net/ipv6/route.c:2507 ip6_route_output_flags+0x3c/0x200 net/ipv6/route.c:2520 ip6_dst_lookup_tail+0x1b9/0x1210 net/ipv6/ip6_output.c:1117 ip6_dst_lookup_flow+0x49/0xc0 net/ipv6/ip6_output.c:1220 tipc_udp_xmit+0x305/0x8e0 net/tipc/udp_media.c:204 tipc_udp_send_msg+0x246/0x2e0 net/tipc/udp_media.c:252 tipc_bearer_xmit_skb+0x27d/0x360 net/tipc/bearer.c:548 tipc_disc_timeout+0x6a2/0x830 net/tipc/discover.c:337 call_timer_fn+0x38/0x290 kernel/time/timer.c:1450 expire_timers kernel/time/timer.c:1495 [inline] __run_timers+0x639/0x9a0 kernel/time/timer.c:1789 run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1802 __do_softirq+0x255/0x563 kernel/softirq.c:309 asm_call_irq_on_stack+0xf/0x20 __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+0x60/0x80 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:405 [inline] __irq_exit_rcu+0x128/0x150 kernel/softirq.c:435 irq_exit_rcu+0x9/0x10 kernel/softirq.c:447 sysvec_apic_timer_interrupt+0xbf/0xe0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635 RIP: 0010:__sanitizer_cov_trace_pc+0x5c/0x60 kernel/kcov.c:207 Code: b8 0a 00 00 83 fa 02 75 21 48 8b 91 c0 0a 00 00 48 8b 32 48 8d 7e 01 8b 89 bc 0a 00 00 48 39 cf 73 08 48 89 44 f2 08 48 89 3a <5d> c3 66 90 55 48 89 e5 48 8b 45 08 65 48 8b 15 a0 cc 9e 7e 65 8b RSP: 0018:ffffc90000be6850 EFLAGS: 00000246 RAX: ffffffff84262019 RBX: ffff888115216020 RCX: 0000000000080000 RDX: ffffc9000297a000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: ffffc90000be6850 R08: ffff8881256f62c0 R09: 000000000000000f R10: 0000000000000022 R11: 0000000000000002 R12: 0000000000000000 R13: dffffc0000000000 R14: 000000000000189d R15: ffff888115216080 vlan_device_event+0x10b9/0x1d20 net/8021q/vlan.c:438 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0x90/0x100 kernel/notifier.c:410 call_netdevice_notifiers_info net/core/dev.c:2054 [inline] call_netdevice_notifiers_extack net/core/dev.c:2066 [inline] call_netdevice_notifiers net/core/dev.c:2080 [inline] __dev_notify_flags+0x28f/0x500 net/core/dev.c:-1 dev_change_flags+0xe8/0x1a0 net/core/dev.c:8610 do_setlink+0xbb4/0x3ab0 net/core/rtnetlink.c:2732 rtnl_group_changelink net/core/rtnetlink.c:3251 [inline] __rtnl_newlink net/core/rtnetlink.c:3420 [inline] rtnl_newlink+0xd32/0x1640 net/core/rtnetlink.c:3530 rtnetlink_rcv_msg+0x9db/0xb90 net/core/rtnetlink.c:5610 netlink_rcv_skb+0x1e0/0x430 net/netlink/af_netlink.c:2503 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5628 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x876/0xa40 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x88d/0xb30 net/netlink/af_netlink.c:1914 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] ____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2376 ___sys_sendmsg+0x1f0/0x260 net/socket.c:2430 __sys_sendmsg net/socket.c:2459 [inline] __do_sys_sendmsg net/socket.c:2468 [inline] __se_sys_sendmsg net/socket.c:2466 [inline] __x64_sys_sendmsg+0x1e2/0x2a0 net/socket.c:2466 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7ff18abe8be9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff189651038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007ff18ae1ffa0 RCX: 00007ff18abe8be9 RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000008 RBP: 00007ff18ac6be19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff18ae20038 R14: 00007ff18ae1ffa0 R15: 00007fff3288b2d8 Modules linked in: ---[ end trace e173f9c043749aa9 ]--- RIP: 0010:__in6_dev_get include/net/addrconf.h:355 [inline] RIP: 0010:ip6_ignore_linkdown include/net/addrconf.h:446 [inline] RIP: 0010:find_match+0xa7/0xd60 net/ipv6/route.c:739 Code: 41 80 7c 05 00 00 74 08 4c 89 f7 e8 13 96 a6 fd 41 bc e0 02 00 00 4d 03 26 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 e7 e8 eb 95 a6 fd 4d 8b 24 24 4d 85 e4 0f RSP: 0018:ffffc90000007070 EFLAGS: 00010206 RAX: 000000000000005c RBX: 0000000000000003 RCX: dffffc0000000000 RDX: ffff8881256f62c0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900000070f8 R08: ffffc90000007420 R09: ffffc90000007430 R10: fffff52000000ea6 R11: 1ffff92000000ea2 R12: 00000000000002e0 R13: 1ffff1102284c044 R14: ffff888114260220 R15: 0000000000000000 FS: 00007ff1896516c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000013c359000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 41 80 7c 05 00 00 cmpb $0x0,0x0(%r13,%rax,1) 6: 74 08 je 0x10 8: 4c 89 f7 mov %r14,%rdi b: e8 13 96 a6 fd call 0xfda69623 10: 41 bc e0 02 00 00 mov $0x2e0,%r12d 16: 4d 03 26 add (%r14),%r12 19: 4c 89 e0 mov %r12,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 e7 mov %r12,%rdi 33: e8 eb 95 a6 fd call 0xfda69623 38: 4d 8b 24 24 mov (%r12),%r12 3c: 4d 85 e4 test %r12,%r12 3f: 0f .byte 0xf