general protection fault in neigh_flush

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	general protection fault in neigh_flush_dev net				2	2311d	2312d	0/26	closed as invalid on 2018/02/13 19:56
general protection fault, probably for non-canonical address 0xf8c014d8d8c0005d: 0000 [#1] PREEMPT SMP KASAN
KASAN: maybe wild-memory-access in range [0xc600c6c6c60002e8-0xc600c6c6c60002ef]
CPU: 0 PID: 13719 Comm: syz-executor.0 Not tainted 5.8.0-next-20200812-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:neigh_flush_dev+0x1a7/0x850 net/core/neighbour.c:301
Code: 8b 2e 48 85 ed 0f 84 71 04 00 00 e8 d3 93 33 fb 48 83 3c 24 00 74 38 e8 c7 93 33 fb 48 8d bd e8 02 00 00 48 89 f8 48 c1 e8 03 <42> 80 3c 38 00 0f 85 f2 05 00 00 48 8b 04 24 48 39 85 e8 02 00 00
RSP: 0018:ffffc900088ce9b8 EFLAGS: 00010a02
RAX: 18c018d8d8c0005d RBX: 0000000000000001 RCX: ffffc90002379000
RDX: 0000000000040000 RSI: ffffffff8640dcf9 RDI: c600c6c6c60002e8
RBP: c600c6c6c6000000 R08: 0000000000000001 R09: 0000000000000003
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff888000156800 R15: dffffc0000000000
FS:  00007f137cbe1700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e723000 CR3: 00000001e8d81000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __neigh_ifdown.isra.0+0x54/0x360 net/core/neighbour.c:352
 neigh_ifdown+0x1b/0x30 net/core/neighbour.c:369
 rt6_disable_ip+0x700/0x870 net/ipv6/route.c:4786
 addrconf_ifdown.isra.0+0xf6/0x1570 net/ipv6/addrconf.c:3716
 addrconf_notify+0x55c/0x2310 net/ipv6/addrconf.c:3641
 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2033
 call_netdevice_notifiers_mtu net/core/dev.c:2082 [inline]
 dev_set_mtu_ext+0x38b/0x590 net/core/dev.c:8426
 do_setlink+0x508/0x3a70 net/core/rtnetlink.c:2669
 __rtnl_newlink+0xc1c/0x1740 net/core/rtnetlink.c:3374
 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3500
 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5563
 netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2470
 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330
 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:671
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2353
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2407
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2440
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d189
Code: 5d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f137cbe0c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000002c0c0 RCX: 000000000045d189
RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000003
RBP: 000000000118d020 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cfec
R13: 00007fffa60ddfaf R14: 00007f137cbe19c0 R15: 000000000118cfec
Modules linked in:
---[ end trace c0d89faf6a914a6f ]---
RIP: 0010:neigh_flush_dev+0x1a7/0x850 net/core/neighbour.c:301
Code: 8b 2e 48 85 ed 0f 84 71 04 00 00 e8 d3 93 33 fb 48 83 3c 24 00 74 38 e8 c7 93 33 fb 48 8d bd e8 02 00 00 48 89 f8 48 c1 e8 03 <42> 80 3c 38 00 0f 85 f2 05 00 00 48 8b 04 24 48 39 85 e8 02 00 00
RSP: 0018:ffffc900088ce9b8 EFLAGS: 00010a02
RAX: 18c018d8d8c0005d RBX: 0000000000000001 RCX: ffffc90002379000
RDX: 0000000000040000 RSI: ffffffff8640dcf9 RDI: c600c6c6c60002e8
RBP: c600c6c6c6000000 R08: 0000000000000001 R09: 0000000000000003
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff888000156800 R15: dffffc0000000000
FS:  00007f137cbe1700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e723000 CR3: 00000001e8d81000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400