==================================================================
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 ffff8800b5210dd8 by task syz-executor4/5921

CPU: 0 PID: 5921 Comm: syz-executor4 Not tainted 4.4.152-ge5c5f1f #89
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 980142c234788434 ffff8800a156f5c8 ffffffff81e15fed
 ffffea0002d48400 ffff8800b5210dd8 0000000000000000 ffff8800b5210dd8
 0000000000001200 ffff8800a156f600 ffffffff8151b489 ffff8800b5210dd8
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
sg_read: process 260 (syz-executor1) changed security contexts after opening file descriptor, this is not allowed.
 [<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 ffff8800b5210dc0
 which belongs to the cache ip_dst_cache of size 208
The buggy address is located 24 bytes inside of
 208-byte region [ffff8800b5210dc0, ffff8800b5210e90)
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: 1 PID: 2151 Comm: udevd Not tainted 4.4.152-ge5c5f1f #89
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800b4b83000 task.stack: ffff8800b4bf0000
RIP: 0010:[<ffffffff81227d85>]  [<ffffffff81227d85>] cpuacct_charge+0x155/0x380 kernel/sched/cpuacct.c:247
RSP: 0018:ffff8800b4bf7c28  EFLAGS: 00010046
RAX: 1ffffffff089521f RBX: 00000000000185a8 RCX: ffffffff84a16680
RDX: fffffbff743edb30 RSI: fffffffba1f6d980 RDI: ffffffff844a90f8
RBP: ffff8800b4bf7c68 R08: ffff8800b4b83950 R09: 0000000000000001
R10: 0000000000000001 R11: ffff8800b4b83000 R12: ffffffff844a9020
R13: dffffc0000000000 R14: 000000001f2306d6 R15: ffffffff83aaae60
FS:  00007fbe5ec5c7a0(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffba1f6d980 CR3: 00000000b4bc8000 CR4: 00000000001606f0
Stack:
 ffffffff81227c90 0000000000000046 0000000000000003 ffff8801d3c4c860
 ffff8801d3c4c800 000000001f2306d6 ffff8801d3c4c8b0 0000000000000000
 ffff8800b4bf7cb0 ffffffff811dc309 0000000000000020 ffff8801d26f8000
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
 [<ffffffff811c9637>] wake_up_new_task+0x647/0xe30 kernel/sched/core.c:2491
 [<ffffffff81131029>] _do_fork+0x2a9/0xe20 kernel/fork.c:1814
 [<ffffffff81131c77>] SYSC_clone kernel/fork.c:1899 [inline]
 [<ffffffff81131c77>] SyS_clone+0x37/0x50 kernel/fork.c:1893
 [<ffffffff838cc565>] entry_SYSCALL_64_fastpath+0x22/0x9e
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 <ffff8800b4bf7c28>
CR2: fffffffba1f6d980
---[ end trace d8516f358702b6a2 ]---