==================================================================
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 ffff8800b47b4a18 by task syz-executor0/6163

CPU: 1 PID: 6163 Comm: syz-executor0 Not tainted 4.4.152-ge5c5f1f #89
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 ee74d6395868db28 ffff8800ae03f5c8 ffffffff81e15fed
 ffffea0002d1ed00 ffff8800b47b4a18 0000000000000000 ffff8800b47b4a18
 0000000000001000 ffff8800ae03f600 ffffffff8151b489 ffff8800b47b4a18
Call Trace:
 [<ffffffff81e15fed>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81e15fed>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff8151b489>] print_address_description+0x6c/0x216 mm/kasan/report.c:252
 [<ffffffff8151b7a8>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff8151b7a8>] kasan_report.cold.7+0x175/0x2f7 mm/kasan/report.c:408
 [<ffffffff814fe734>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff83435efc>] ip6_dst_idev include/net/ip6_fib.h:141 [inline]
 [<ffffffff83435efc>] ip6_xmit+0x177c/0x1a00 net/ipv6/ip6_output.c:237
 [<ffffffff834f60c5>] inet6_csk_xmit+0x245/0x490 net/ipv6/inet6_connection_sock.c:176
 [<ffffffff835a570c>] l2tp_xmit_core net/l2tp/l2tp_core.c:1084 [inline]
 [<ffffffff835a570c>] l2tp_xmit_skb+0xb9c/0xe80 net/l2tp/l2tp_core.c:1179
 [<ffffffff835b1c60>] pppol2tp_sendmsg+0x4e0/0x7d0 net/l2tp/l2tp_ppp.c:355
 [<ffffffff82f2727c>] sock_sendmsg_nosec net/socket.c:638 [inline]
 [<ffffffff82f2727c>] sock_sendmsg+0xcc/0x110 net/socket.c:648
 [<ffffffff82f28a41>] ___sys_sendmsg+0x441/0x880 net/socket.c:1975
 [<ffffffff82f2b02e>] __sys_sendmmsg+0x12e/0x2e0 net/socket.c:2060
 [<ffffffff82f2b215>] SYSC_sendmmsg net/socket.c:2090 [inline]
 [<ffffffff82f2b215>] SyS_sendmmsg+0x35/0x60 net/socket.c:2085
 [<ffffffff838cc565>] entry_SYSCALL_64_fastpath+0x22/0x9e

Allocated by task 0:
(stack is not available)

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8800b47b4a00
 which belongs to the cache ip_dst_cache of size 208
The buggy address is located 24 bytes inside of
 208-byte region [ffff8800b47b4a00, ffff8800b47b4ad0)
The buggy address belongs to the page:
BUG: unable to handle kernel paging request at fffffffba1f6d980
IP: [<ffffffff81227d85>] 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)
Modules linked in:
CPU: 0 PID: 1683 Comm: kworker/0:2 Not tainted 4.4.152-ge5c5f1f #89
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events vmstat_shepherd
task: ffff8800b6dd0000 task.stack: ffff8800b6db0000
RIP: 0010:[<ffffffff81227d85>]  [<ffffffff81227d85>] cpuacct_charge+0x155/0x380 kernel/sched/cpuacct.c:247
RSP: 0018:ffff8800b6db78b8  EFLAGS: 00010046
RAX: 1ffffffff089521f RBX: 00000000000185a8 RCX: ffffffff84a16680
RDX: fffffbff743edb30 RSI: fffffffba1f6d980 RDI: ffffffff844a90f8
RBP: ffff8800b6db78f8 R08: ffff8800b6dd09f0 R09: 0000000000000001
R10: 0000000000000001 R11: ffff8800b6dd0000 R12: ffffffff844a9020
R13: dffffc0000000000 R14: 0000000004c58b9b R15: ffffffff83aaae60
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffba1f6d980 CR3: 00000001c0913000 CR4: 00000000001606f0
Stack:
 ffffffff81227c90 0000000000000046 0000000000000003 ffff8801bc7cb060
 ffff8801bc7cb000 0000000004c58b9b ffff8801bc7cb0b0 0000000000000000
 ffff8800b6db7940 ffffffff811dc309 0000000000000005 ffff8801db31f558
Call Trace:
 [<ffffffff811dc309>] update_curr+0x2c9/0x6d0 kernel/sched/fair.c:882
 [<ffffffff811e750a>] enqueue_entity kernel/sched/fair.c:3512 [inline]
 [<ffffffff811e750a>] enqueue_task_fair+0x2fa/0x2790 kernel/sched/fair.c:4695
 [<ffffffff811be9ed>] enqueue_task kernel/sched/core.c:858 [inline]
 [<ffffffff811be9ed>] activate_task+0x14d/0x280 kernel/sched/core.c:874
 [<ffffffff811bfa1f>] ttwu_activate kernel/sched/core.c:1736 [inline]
 [<ffffffff811bfa1f>] ttwu_do_activate.constprop.109+0xbf/0x1e0 kernel/sched/core.c:1789
 [<ffffffff811c2c30>] ttwu_queue kernel/sched/core.c:1934 [inline]
 [<ffffffff811c2c30>] try_to_wake_up+0x660/0xf00 kernel/sched/core.c:2068
 [<ffffffff811c3615>] wake_up_process+0x15/0x20 kernel/sched/core.c:2142
 [<ffffffff8117f0aa>] wake_up_worker kernel/workqueue.c:846 [inline]
 [<ffffffff8117f0aa>] insert_work+0x17a/0x210 kernel/workqueue.c:1318
 [<ffffffff8117f51c>] __queue_work+0x3dc/0xea0 kernel/workqueue.c:1433
 [<ffffffff811802af>] __queue_delayed_work+0x23f/0x390 kernel/workqueue.c:1495
 [<ffffffff81182079>] queue_delayed_work_on+0x59/0xb0 kernel/workqueue.c:1533
 [<ffffffff81472786>] vmstat_shepherd+0x166/0x230 mm/vmstat.c:1488
 [<ffffffff8118501f>] process_one_work+0x7df/0x1600 kernel/workqueue.c:2064
 [<ffffffff81185f19>] worker_thread+0xd9/0xfc0 kernel/workqueue.c:2196
 [<ffffffff81193a28>] kthread+0x268/0x300 kernel/kthread.c:211
 [<ffffffff838cc995>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:510
Code: 49 8d bc 24 d8 00 00 00 48 89 f8 48 c1 e8 03 42 80 3c 28 00 0f 85 c4 01 00 00 49 8b 9c 24 d8 00 00 00 80 3a 00 0f 85 8f 01 00 00 <4a> 03 1c f9 48 89 d8 48 c1 e8 03 42 80 3c 28 00 0f 85 be 01 00 
RIP  [<ffffffff81227d85>] cpuacct_charge+0x155/0x380 kernel/sched/cpuacct.c:247
 RSP <ffff8800b6db78b8>
CR2: fffffffba1f6d980
---[ end trace 30b85671301dcd8b ]---