==================================================================
BUG: KASAN: slab-out-of-bounds in ip6_dst_idev include/net/ip6_fib.h:141 [inline]
BUG: KASAN: slab-out-of-bounds in ip6_xmit+0x177c/0x1a00 net/ipv6/ip6_output.c:237
Read of size 8 at addr ffff8801d2d21f18 by task syz-executor3/22335

CPU: 0 PID: 22335 Comm: syz-executor3 Not tainted 4.4.153-g5e24b4e #26
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 c00fad6fa25f2d71 ffff8801c4dff548 ffffffff81e162ed
 ffffea00074b4840 ffff8801d2d21f18 0000000000000000 ffff8801d2d21f18
 0000000000001200 ffff8801c4dff580 ffffffff8151b4d9 ffff8801d2d21f18
Call Trace:
 [<ffffffff81e162ed>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81e162ed>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff8151b4d9>] print_address_description+0x6c/0x216 mm/kasan/report.c:252
 [<ffffffff8151b7f8>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff8151b7f8>] kasan_report.cold.7+0x175/0x2f7 mm/kasan/report.c:408
 [<ffffffff814fe784>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff834361fc>] ip6_dst_idev include/net/ip6_fib.h:141 [inline]
 [<ffffffff834361fc>] ip6_xmit+0x177c/0x1a00 net/ipv6/ip6_output.c:237
 [<ffffffff834f63c5>] inet6_csk_xmit+0x245/0x490 net/ipv6/inet6_connection_sock.c:176
 [<ffffffff835a5a0c>] l2tp_xmit_core net/l2tp/l2tp_core.c:1084 [inline]
 [<ffffffff835a5a0c>] l2tp_xmit_skb+0xb9c/0xe80 net/l2tp/l2tp_core.c:1179
 [<ffffffff835b1f60>] pppol2tp_sendmsg+0x4e0/0x7d0 net/l2tp/l2tp_ppp.c:355
 [<ffffffff82f2757c>] sock_sendmsg_nosec net/socket.c:638 [inline]
 [<ffffffff82f2757c>] sock_sendmsg+0xcc/0x110 net/socket.c:648
 [<ffffffff82f28d41>] ___sys_sendmsg+0x441/0x880 net/socket.c:1975
 [<ffffffff82f2b3d4>] __sys_sendmmsg+0x1d4/0x2e0 net/socket.c:2053
 [<ffffffff83014e22>] C_SYSC_sendmmsg net/compat.c:728 [inline]
 [<ffffffff83014e22>] compat_SyS_sendmmsg+0x32/0x40 net/compat.c:725
 [<ffffffff81006d94>] do_syscall_32_irqs_on arch/x86/entry/common.c:393 [inline]
 [<ffffffff81006d94>] do_fast_syscall_32+0x324/0x8b0 arch/x86/entry/common.c:460
 [<ffffffff838ce1c3>] sysenter_flags_fixed+0xd/0x1a

Allocated by task 22335:
 [<ffffffff81034676>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fd823>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fdb07>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fdb07>] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:616
 [<ffffffff814fe0d2>] kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:554
 [<ffffffff814f9bee>] slab_post_alloc_hook mm/slub.c:1349 [inline]
 [<ffffffff814f9bee>] slab_alloc_node mm/slub.c:2615 [inline]
 [<ffffffff814f9bee>] slab_alloc mm/slub.c:2623 [inline]
 [<ffffffff814f9bee>] kmem_cache_alloc+0xbe/0x2a0 mm/slub.c:2628
 [<ffffffff82fa5b35>] dst_alloc+0xb5/0x1a0 net/core/dst.c:210
 [<ffffffff831f2cc8>] rt_dst_alloc+0x78/0x430 net/ipv4/route.c:1478
 [<ffffffff831fc18c>] __mkroute_output net/ipv4/route.c:2132 [inline]
 [<ffffffff831fc18c>] __ip_route_output_key_hash+0x9ac/0x2380 net/ipv4/route.c:2344
 [<ffffffff831fe639>] __ip_route_output_key include/net/route.h:124 [inline]
 [<ffffffff831fe639>] ip_route_output_flow+0x29/0xa0 net/ipv4/route.c:2431
 [<ffffffff832c8243>] ip_route_connect include/net/route.h:304 [inline]
 [<ffffffff832c8243>] __ip4_datagram_connect+0x663/0xfe0 net/ipv4/datagram.c:51
 [<ffffffff834e7ff0>] __ip6_datagram_connect+0x1280/0x1960 net/ipv6/datagram.c:105
 [<ffffffff834e86ff>] ip6_datagram_connect+0x2f/0x50 net/ipv6/datagram.c:223
 [<ffffffff83303357>] inet_dgram_connect+0x117/0x200 net/ipv4/af_inet.c:550
 [<ffffffff82f27ef8>] SYSC_connect+0x1b8/0x300 net/socket.c:1570
 [<ffffffff82f2a844>] SyS_connect+0x24/0x30 net/socket.c:1551
 [<ffffffff81006d94>] do_syscall_32_irqs_on arch/x86/entry/common.c:393 [inline]
 [<ffffffff81006d94>] do_fast_syscall_32+0x324/0x8b0 arch/x86/entry/common.c:460
 [<ffffffff838ce1c3>] sysenter_flags_fixed+0xd/0x1a

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8801d2d21dc0
 which belongs to the cache ip_dst_cache of size 208
The buggy address is located 136 bytes to the right of
 208-byte region [ffff8801d2d21dc0, ffff8801d2d21e90)
The buggy address belongs to the page:
BUG: unable to handle kernel paging request at fffffffba1f6da40
IP: [<ffffffff81227dd5>] cpuacct_charge+0x155/0x380 kernel/sched/cpuacct.c:247
PGD 440f067 PUD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
------------[ cut here ]------------
WARNING: CPU: 1 PID: 122374208 at kernel/rcu/update.c:211 __rcu_read_unlock+0x140/0x1a0 kernel/rcu/update.c:211()