syzbot

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000018: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x00000000000000c0-0x00000000000000c7]
CPU: 1 PID: 5258 Comm: kworker/1:4 Not tainted 6.10.0-rc5-syzkaller-00018-g55027e689933 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: mld mld_ifc_work
RIP: 0010:rt6_get_pcpu_route net/ipv6/route.c:1410 [inline]
RIP: 0010:ip6_pol_route+0x3bc/0x1150 net/ipv6/route.c:2266
Code: f8 48 85 ed 0f 84 52 03 00 00 e8 1f af 04 f8 48 8d bd 98 00 00 00 49 89 ec 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e a3 08 00 00 8b 85 98 00 00 00
RSP: 0018:ffffc900005987f8 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff88805c03d640 RCX: ffffffff8989e0c3
RDX: 0000000000000018 RSI: ffffffff8989e0d1 RDI: 00000000000000c3
RBP: 000000000000002b R08: 0000000000000007 R09: 0000000000000000
R10: 000000000000002b R11: 0000000000000006 R12: 000000000000002b
R13: 1ffff920000b3103 R14: 0000000000000080 R15: ffffc90000598878
FS:  0000000000000000(0000) GS:ffff88802c100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000f747af3c CR3: 0000000057c54000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 pol_lookup_func include/net/ip6_fib.h:616 [inline]
 fib6_rule_lookup+0x536/0x720 net/ipv6/fib6_rules.c:116
 ip6_route_input_lookup net/ipv6/route.c:2302 [inline]
 ip6_route_input+0x60b/0xc10 net/ipv6/route.c:2598
 ip6_rcv_finish_core.constprop.0+0x1a0/0x5d0 net/ipv6/ip6_input.c:66
 ip6_rcv_finish net/ipv6/ip6_input.c:77 [inline]
 NF_HOOK include/linux/netfilter.h:314 [inline]
 NF_HOOK include/linux/netfilter.h:308 [inline]
 ipv6_rcv+0x1e4/0x680 net/ipv6/ip6_input.c:310
 __netif_receive_skb_one_core+0x12e/0x1e0 net/core/dev.c:5625
 __netif_receive_skb+0x1d/0x160 net/core/dev.c:5739
 process_backlog+0x133/0x760 net/core/dev.c:6068
 __napi_poll.constprop.0+0xb7/0x550 net/core/dev.c:6722
 napi_poll net/core/dev.c:6791 [inline]
 net_rx_action+0x9b6/0xf10 net/core/dev.c:6907
 handle_softirqs+0x216/0x8f0 kernel/softirq.c:554
 do_softirq kernel/softirq.c:455 [inline]
 do_softirq+0xb2/0xf0 kernel/softirq.c:442
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x100/0x120 kernel/softirq.c:382
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:851 [inline]
 __dev_queue_xmit+0x872/0x4130 net/core/dev.c:4420
 dev_queue_xmit include/linux/netdevice.h:3095 [inline]
 neigh_resolve_output net/core/neighbour.c:1565 [inline]
 neigh_resolve_output+0x5bc/0x950 net/core/neighbour.c:1545
 neigh_output include/net/neighbour.h:542 [inline]
 ip6_finish_output2+0x673/0x1880 net/ipv6/ip6_output.c:137
 __ip6_finish_output net/ipv6/ip6_output.c:211 [inline]
 ip6_finish_output+0x3f9/0x1300 net/ipv6/ip6_output.c:222
 NF_HOOK_COND include/linux/netfilter.h:303 [inline]
 ip6_output+0x1f8/0x540 net/ipv6/ip6_output.c:243
 dst_output include/net/dst.h:450 [inline]
 NF_HOOK include/linux/netfilter.h:314 [inline]
 NF_HOOK include/linux/netfilter.h:308 [inline]
 mld_sendpack+0x9ee/0x11d0 net/ipv6/mcast.c:1818
 mld_send_cr net/ipv6/mcast.c:2119 [inline]
 mld_ifc_work+0x756/0xce0 net/ipv6/mcast.c:2650
 process_one_work+0x958/0x1ad0 kernel/workqueue.c:3231
 process_scheduled_works kernel/workqueue.c:3312 [inline]
 worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:rt6_get_pcpu_route net/ipv6/route.c:1410 [inline]
RIP: 0010:ip6_pol_route+0x3bc/0x1150 net/ipv6/route.c:2266
Code: f8 48 85 ed 0f 84 52 03 00 00 e8 1f af 04 f8 48 8d bd 98 00 00 00 49 89 ec 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e a3 08 00 00 8b 85 98 00 00 00
RSP: 0018:ffffc900005987f8 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff88805c03d640 RCX: ffffffff8989e0c3
RDX: 0000000000000018 RSI: ffffffff8989e0d1 RDI: 00000000000000c3
RBP: 000000000000002b R08: 0000000000000007 R09: 0000000000000000
R10: 000000000000002b R11: 0000000000000006 R12: 000000000000002b
R13: 1ffff920000b3103 R14: 0000000000000080 R15: ffffc90000598878
FS:  0000000000000000(0000) GS:ffff88802c100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000f747af3c CR3: 0000000057c54000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	f8                   	clc
   1:	48 85 ed             	test   %rbp,%rbp
   4:	0f 84 52 03 00 00    	je     0x35c
   a:	e8 1f af 04 f8       	call   0xf804af2e
   f:	48 8d bd 98 00 00 00 	lea    0x98(%rbp),%rdi
  16:	49 89 ec             	mov    %rbp,%r12
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	74 08                	je     0x3a
  32:	3c 03                	cmp    $0x3,%al
  34:	0f 8e a3 08 00 00    	jle    0x8dd
  3a:	8b 85 98 00 00 00    	mov    0x98(%rbp),%eax