Oops: general protection fault, probably for non-canonical address 0xdffffc0000000083: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000418-0x000000000000041f]
CPU: 0 UID: 0 PID: 31136 Comm: syz.6.6888 Not tainted 6.16.0-rc6-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:ip_ignore_linkdown include/linux/inetdevice.h:270 [inline]
RIP: 0010:fib_lookup_good_nhc+0x85/0x3d0 net/ipv4/fib_trie.c:1408
Code: 4c 89 24 24 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 eb 6f 27 f8 41 bc 18 04 00 00 4c 03 23 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 cc 6f 27 f8 4d 8b 24 24 e8 13 0c
RSP: 0018:ffffc90000006ab0 EFLAGS: 00010202
RAX: 0000000000000083 RBX: ffff88804814df20 RCX: 0000000000000100
RDX: ffff88802eae0000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88804814df37 R08: 0000000000000000 R09: ffffffff89dd5266
R10: ffffc90000006d80 R11: fffff52000000db6 R12: 0000000000000418
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff11009029be6
FS: 0000000000000000(0000) GS:ffff888125c1b000(0063) knlGS:00000000f5074b40
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000003071cffc CR3: 000000003488a000 CR4: 00000000003526f0
Call Trace:
nexthop_get_nhc_lookup+0x1af/0x400 include/net/nexthop.h:437
fib_table_lookup+0xf26/0x16e0 net/ipv4/fib_trie.c:1584
fib_lookup+0x1c5/0x440 include/net/ip_fib.h:390
ip_route_output_key_hash_rcu+0x2fb/0x23a0 net/ipv4/route.c:2803
ip_route_output_key_hash+0x1b9/0x2e0 net/ipv4/route.c:2694
__ip_route_output_key include/net/route.h:169 [inline]
ip_route_output_flow+0x2a/0x150 net/ipv4/route.c:2921
ip_route_output_key include/net/route.h:179 [inline]
udp_tunnel_dst_lookup+0x1ba/0x3e0 net/ipv4/udp_tunnel_core.c:254
vxlan_xmit_one+0x1fd9/0x37e0 drivers/net/vxlan/vxlan_core.c:2461
vxlan_xmit+0x173c/0x29d0 drivers/net/vxlan/vxlan_core.c:2799
__netdev_start_xmit include/linux/netdevice.h:5215 [inline]
netdev_start_xmit include/linux/netdevice.h:5224 [inline]
xmit_one net/core/dev.c:3830 [inline]
dev_hard_start_xmit+0x2d4/0x830 net/core/dev.c:3846
__dev_queue_xmit+0x1adf/0x3a70 net/core/dev.c:4713
dev_queue_xmit include/linux/netdevice.h:3355 [inline]
neigh_hh_output include/net/neighbour.h:523 [inline]
neigh_output include/net/neighbour.h:537 [inline]
ip6_finish_output2+0x11bc/0x16a0 net/ipv6/ip6_output.c:141
__ip6_finish_output net/ipv6/ip6_output.c:-1 [inline]
ip6_finish_output+0x234/0x7d0 net/ipv6/ip6_output.c:226
NF_HOOK include/linux/netfilter.h:317 [inline]
ndisc_send_skb+0xb47/0x1400 net/ipv6/ndisc.c:513
addrconf_rs_timer+0x369/0x670 net/ipv6/addrconf.c:4036
call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1798 [inline]
__run_timers kernel/time/timer.c:2372 [inline]
__run_timer_base+0x61a/0x860 kernel/time/timer.c:2384
run_timer_base kernel/time/timer.c:2393 [inline]
run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
handle_softirqs+0x286/0x870 kernel/softirq.c:579
do_softirq+0xec/0x180 kernel/softirq.c:480
__local_bh_enable_ip+0x17d/0x1c0 kernel/softirq.c:407
local_bh_enable include/linux/bottom_half.h:33 [inline]
rcu_read_unlock_bh include/linux/rcupdate.h:910 [inline]
__dev_queue_xmit+0x1cd7/0x3a70 net/core/dev.c:4740
dev_queue_xmit include/linux/netdevice.h:3355 [inline]
pppoe_sendmsg+0x58b/0x790 drivers/net/ppp/pppoe.c:901
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg+0x219/0x270 net/socket.c:727
____sys_sendmsg+0x52d/0x830 net/socket.c:2566
___sys_sendmsg+0x21f/0x2a0 net/socket.c:2620
__sys_sendmmsg+0x28e/0x430 net/socket.c:2702
__compat_sys_sendmmsg net/compat.c:360 [inline]
__do_compat_sys_sendmmsg net/compat.c:367 [inline]
__se_compat_sys_sendmmsg net/compat.c:364 [inline]
__ia32_compat_sys_sendmmsg+0xa2/0xc0 net/compat.c:364
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0xb6/0x2b0 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x34/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7f94539
Code: 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f507455c EFLAGS: 00000206 ORIG_RAX: 0000000000000159
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000080001640
RDX: 0000000000034000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ip_ignore_linkdown include/linux/inetdevice.h:270 [inline]
RIP: 0010:fib_lookup_good_nhc+0x85/0x3d0 net/ipv4/fib_trie.c:1408
Code: 4c 89 24 24 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 eb 6f 27 f8 41 bc 18 04 00 00 4c 03 23 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 cc 6f 27 f8 4d 8b 24 24 e8 13 0c
RSP: 0018:ffffc90000006ab0 EFLAGS: 00010202
RAX: 0000000000000083 RBX: ffff88804814df20 RCX: 0000000000000100
RDX: ffff88802eae0000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88804814df37 R08: 0000000000000000 R09: ffffffff89dd5266
R10: ffffc90000006d80 R11: fffff52000000db6 R12: 0000000000000418
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff11009029be6
FS: 0000000000000000(0000) GS:ffff888125c1b000(0063) knlGS:00000000f5074b40
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000003071cffc CR3: 000000003488a000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
0: 4c 89 24 24 mov %r12,(%rsp)
4: 48 89 d8 mov %rbx,%rax
7: 48 c1 e8 03 shr $0x3,%rax
b: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1)
10: 74 08 je 0x1a
12: 48 89 df mov %rbx,%rdi
15: e8 eb 6f 27 f8 call 0xf8277005
1a: 41 bc 18 04 00 00 mov $0x418,%r12d
20: 4c 03 23 add (%rbx),%r12
23: 4c 89 e0 mov %r12,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 4c 89 e7 mov %r12,%rdi
34: e8 cc 6f 27 f8 call 0xf8277005
39: 4d 8b 24 24 mov (%r12),%r12
3d: e8 .byte 0xe8
3e: 13 .byte 0x13
3f: 0c .byte 0xc