IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready
8021q: adding VLAN 0 to HW filter on device bond0
IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
==================================================================
BUG: KASAN: slab-out-of-bounds in ip6_dst_idev include/net/ip6_fib.h:192 [inline]
BUG: KASAN: slab-out-of-bounds in ip6_xmit+0x1f76/0x2260 net/ipv6/ip6_output.c:264
Read of size 8 at addr ffff8801b4d83118 by task syzkaller578297/4246

CPU: 0 PID: 4246 Comm: syzkaller578297 Not tainted 4.16.0-rc4+ #266
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x24d lib/dump_stack.c:53
 print_address_description+0x73/0x250 mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report+0x23c/0x360 mm/kasan/report.c:412
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
 ip6_dst_idev include/net/ip6_fib.h:192 [inline]
 ip6_xmit+0x1f76/0x2260 net/ipv6/ip6_output.c:264
 inet6_csk_xmit+0x2fc/0x580 net/ipv6/inet6_connection_sock.c:139
 l2tp_xmit_core net/l2tp/l2tp_core.c:1053 [inline]
 l2tp_xmit_skb+0x105f/0x1410 net/l2tp/l2tp_core.c:1148
 pppol2tp_sendmsg+0x470/0x670 net/l2tp/l2tp_ppp.c:341
 sock_sendmsg_nosec net/socket.c:629 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:639
 ___sys_sendmsg+0x767/0x8b0 net/socket.c:2047
 __sys_sendmsg+0xe5/0x210 net/socket.c:2081
 SYSC_sendmsg net/socket.c:2092 [inline]
 SyS_sendmsg+0x2d/0x50 net/socket.c:2088
 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x442b79
RSP: 002b:00007fff9e75d508 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000000001a RCX: 0000000000442b79
RDX: 000000000000c045 RSI: 0000000020002540 RDI: 0000000000000004
RBP: 00000000004a456f R08: 00000000004a456f R09: 00000000004a456f
R10: 00000000004a456f R11: 0000000000000246 R12: 00007fff9e75d5e0
R13: 0000000000403900 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 0:
(stack is not available)

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8801b4d83100
 which belongs to the cache ip_dst_cache of size 160
The buggy address is located 24 bytes inside of
 160-byte region [ffff8801b4d83100, ffff8801b4d831a0)
The buggy address belongs to the page:
page:ffffea0006d360c0 count:1 mapcount:0 mapping:ffff8801b4d83000 index:0x0
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801b4d83000 0000000000000000 0000000100000010
raw: ffffea000711a7a0 ffff8801d6f90348 ffff8801d81af300 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801b4d83000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801b4d83080: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8801b4d83100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                            ^
 ffff8801b4d83180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801b4d83200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================