==================================================================
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 ffff8801d94c7f18 by task syz-executor2/10012

CPU: 1 PID: 10012 Comm: syz-executor2 Not tainted 4.4.153-g5e24b4e #90
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 7caf741ac9284b6e ffff8800a25975c8 ffffffff81e162ed
 ffffea00076531c0 ffff8801d94c7f18 0000000000000000 ffff8801d94c7f18
 0000000000001000 ffff8800a2597600 ffffffff8151b4d9 ffff8801d94c7f18
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
 [<ffffffff82f2b32e>] __sys_sendmmsg+0x12e/0x2e0 net/socket.c:2060
 [<ffffffff82f2b515>] SYSC_sendmmsg net/socket.c:2090 [inline]
 [<ffffffff82f2b515>] SyS_sendmmsg+0x35/0x60 net/socket.c:2085
 [<ffffffff838cc865>] entry_SYSCALL_64_fastpath+0x22/0x9e

Allocated by task 10012:
 [<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
 [<ffffffff838cc865>] entry_SYSCALL_64_fastpath+0x22/0x9e

Freed by task 8518:
 [<ffffffff81034676>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fd823>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [  143.492168] input: syz1 as /devices/virtual/input/input15
[<ffffffff814fe152>] set_track mm/kasan/kasan.c:524 [inline]
[<ffffffff814fe152>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589
 [<ffffffff814fb33e>] slab_free_hook mm/slub.c:1383 [inline]
 [<ffffffff814fb33e>] slab_free_freelist_hook mm/slub.c:1405 [inline]
 [<ffffffff814fb33e>] slab_free mm/slub.c:2859 [inline]
 [<ffffffff814fb33e>] kmem_cache_free+0xbe/0x340 mm/slub.c:2881
 [<ffffffff82fa4de5>] dst_destroy.part.6+0x1f5/0x330 net/core/dst.c:270
 [<ffffffff82fa5465>] dst_destroy net/core/dst.c:252 [inline]
 [<ffffffff82fa5465>] dst_destroy_rcu+0x15/0x40 net/core/dst.c:295
 [<ffffffff81288d97>] __rcu_reclaim kernel/rcu/rcu.h:118 [inline]
 [<ffffffff81288d97>] rcu_do_batch kernel/rcu/tree.c:2705 [inline]
 [<ffffffff81288d97>] invoke_rcu_callbacks kernel/rcu/tree.c:2973 [inline]
 [<ffffffff81288d97>] __rcu_process_callbacks kernel/rcu/tree.c:2940 [inline]
 [<ffffffff81288d97>] rcu_process_callbacks+0x927/0x1440 kernel/rcu/tree.c:2957
input: syz1 as /devices/virtual/input/input16
 [<ffffffff838cfd7c>] __do_softirq+0x22c/0xa1a kernel/softirq.c:273

The buggy address belongs to the object at ffff8801d94c7dc0
 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 [ffff8801d94c7dc0, ffff8801d94c7e90)
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)
Modules linked in:
CPU: 0 PID: 3901 Comm: syz-executor2 Not tainted 4.4.153-g5e24b4e #90
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801c78ae000 task.stack: ffff8801bcc48000
RIP: 0010:[<ffffffff81227dd5>]  [<ffffffff81227dd5>] cpuacct_charge+0x155/0x380 kernel/sched/cpuacct.c:247
RSP: 0018:ffff8801bcc4f620  EFLAGS: 00010046
RAX: 1ffffffff089521f RBX: 00000000000185a8 RCX: ffffffff84a16740
RDX: fffffbff743edb48 RSI: fffffffba1f6da40 RDI: ffffffff844a90f8
RBP: ffff8801bcc4f660 R08: ffff8801c78ae9c8 R09: 0000000000000001
R10: 0000000000000001 R11: ffff8801c78ae000 R12: ffffffff844a9020
R13: dffffc0000000000 R14: 00000000066270e8 R15: ffffffff83aaae60
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffba1f6da40 CR3: 00000001c174f000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff81227ce0 0000000000000046 0000000000000003 ffff8801bac5c860
 ffff8801bac5c800 00000000066270e8 ffff8801bac5c8b0 0000000000000000
 ffff8801bcc4f6a8 ffffffff811dc359 0000000000000005 ffff8801db31f558
Call Trace:
 [<ffffffff811dc359>] update_curr+0x2c9/0x6d0 kernel/sched/fair.c:882
 [<ffffffff811e755a>] enqueue_entity kernel/sched/fair.c:3512 [inline]
 [<ffffffff811e755a>] enqueue_task_fair+0x2fa/0x2790 kernel/sched/fair.c:4695
 [<ffffffff811bea3d>] enqueue_task kernel/sched/core.c:858 [inline]
 [<ffffffff811bea3d>] activate_task+0x14d/0x280 kernel/sched/core.c:874
 [<ffffffff811bfa6f>] ttwu_activate kernel/sched/core.c:1736 [inline]
 [<ffffffff811bfa6f>] ttwu_do_activate.constprop.109+0xbf/0x1e0 kernel/sched/core.c:1789
 [<ffffffff811c2c80>] ttwu_queue kernel/sched/core.c:1934 [inline]
 [<ffffffff811c2c80>] try_to_wake_up+0x660/0xf00 kernel/sched/core.c:2068
 [<ffffffff811c57d0>] wake_up_state+0x10/0x20 kernel/sched/core.c:2148
 [<ffffffff81158b54>] signal_wake_up_state+0x44/0x70 kernel/signal.c:659
 [<ffffffff811591eb>] signal_wake_up include/linux/sched.h:3332 [inline]
 [<ffffffff811591eb>] complete_signal+0x62b/0x790 kernel/signal.c:942
 [<ffffffff8115a735>] __send_signal+0x4d5/0x11b0 kernel/signal.c:1080
 [<ffffffff8115b45a>] send_signal+0x4a/0xc0 kernel/signal.c:1096
 [<ffffffff8115db44>] do_send_sig_info+0xa4/0x130 kernel/signal.c:1151
 [<ffffffff8115dc03>] send_sig_info+0x33/0x50 kernel/signal.c:1436
 [<ffffffff81329c3d>] zap_pid_ns_processes+0x28d/0x690 kernel/pid_namespace.c:223
 [<ffffffff81139541>] find_child_reaper kernel/exit.c:477 [inline]
 [<ffffffff81139541>] forget_original_parent kernel/exit.c:563 [inline]
 [<ffffffff81139541>] exit_notify kernel/exit.c:599 [inline]
 [<ffffffff81139541>] do_exit+0x1c21/0x26b0 kernel/exit.c:776
 [<ffffffff8113e241>] do_group_exit+0x111/0x330 kernel/exit.c:885
 [<ffffffff8116163c>] get_signal+0x4ec/0x14b0 kernel/signal.c:2321
 [<ffffffff8100df4b>] do_signal+0x8b/0x1d30 arch/x86/kernel/signal.c:712
 [<ffffffff8100360a>] exit_to_usermode_loop+0x11a/0x160 arch/x86/entry/common.c:249
 [<ffffffff81006363>] prepare_exit_to_usermode+0xe3/0x100 arch/x86/entry/common.c:284
 [<ffffffff838cd408>] retint_user+0x8/0x3c
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  [<ffffffff81227dd5>] cpuacct_charge+0x155/0x380 kernel/sched/cpuacct.c:247
 RSP <ffff8801bcc4f620>
CR2: fffffffba1f6da40
---[ end trace 8204ea25ce46d6d2 ]---