==================================================================
BUG: KASAN: slab-out-of-bounds in ip6_tnl_xmit2+0x1f95/0x2320 net/ipv6/ip6_tunnel.c:987
Read of size 16 at addr ffff8801da77a230 by task syz-executor.5/4912

CPU: 0 PID: 4912 Comm: syz-executor.5 Not tainted 4.4.174+ #17
 0000000000000000 be332f5d6bc2adf2 ffff8800a04cf230 ffffffff81aad1a1
 0000000000000000 ffffea000769de00 ffff8801da77a230 0000000000000010
 ffff8801da779f80 ffff8800a04cf268 ffffffff81490120 0000000000000000
Call Trace:
 [<ffffffff81aad1a1>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81aad1a1>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<ffffffff81490120>] print_address_description+0x6f/0x21b mm/kasan/report.c:252
 [<ffffffff81490358>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff81490358>] kasan_report mm/kasan/report.c:408 [inline]
 [<ffffffff81490358>] kasan_report.cold+0x8c/0x2be mm/kasan/report.c:393
 [<ffffffff81484faf>] __asan_report_load_n_noabort+0xf/0x20 mm/kasan/report.c:439
 [<ffffffff826b3105>] ip6_tnl_xmit2+0x1f95/0x2320 net/ipv6/ip6_tunnel.c:987
 [<ffffffff826b4e59>] ip4ip6_tnl_xmit net/ipv6/ip6_tunnel.c:1134 [inline]
 [<ffffffff826b4e59>] ip6_tnl_xmit+0xa09/0xe00 net/ipv6/ip6_tunnel.c:1212
 [<ffffffff82245071>] __netdev_start_xmit include/linux/netdevice.h:3750 [inline]
 [<ffffffff82245071>] netdev_start_xmit include/linux/netdevice.h:3759 [inline]
 [<ffffffff82245071>] xmit_one net/core/dev.c:2781 [inline]
 [<ffffffff82245071>] dev_hard_start_xmit+0x7c1/0x11e0 net/core/dev.c:2797
 [<ffffffff822473cb>] __dev_queue_xmit+0x164b/0x1bb0 net/core/dev.c:3229
 [<ffffffff82247948>] dev_queue_xmit+0x18/0x20 net/core/dev.c:3263
 [<ffffffff8225c136>] neigh_direct_output+0x16/0x20 net/core/neighbour.c:1369
 [<ffffffff823c5412>] dst_neigh_output include/net/dst.h:461 [inline]
 [<ffffffff823c5412>] ip_finish_output2+0x6a2/0x1280 net/ipv4/ip_output.c:213
 [<ffffffff823cc6e2>] ip_finish_output+0x8b2/0xc60 net/ipv4/ip_output.c:288
 [<ffffffff823d04a7>] NF_HOOK_COND include/linux/netfilter.h:240 [inline]
 [<ffffffff823d04a7>] ip_output+0x227/0x4c0 net/ipv4/ip_output.c:362
 [<ffffffff823cd21c>] dst_output include/net/dst.h:498 [inline]
 [<ffffffff823cd21c>] ip_local_out+0x9c/0x180 net/ipv4/ip_output.c:119
 [<ffffffff823ce58c>] ip_queue_xmit+0x89c/0x1ab0 net/ipv4/ip_output.c:461
 [<ffffffff82431dd4>] __tcp_transmit_skb+0x1904/0x2cf0 net/ipv4/tcp_output.c:1034
 [<ffffffff824337e4>] tcp_transmit_skb net/ipv4/tcp_output.c:1047 [inline]
 [<ffffffff824337e4>] tcp_write_xmit+0x624/0x4570 net/ipv4/tcp_output.c:2137
 [<ffffffff82437fcb>] __tcp_push_pending_frames+0xab/0x2b0 net/ipv4/tcp_output.c:2323
 [<ffffffff8243eeab>] tcp_send_fin+0x15b/0xa90 net/ipv4/tcp_output.c:2899
 [<ffffffff823f5b02>] tcp_shutdown net/ipv4/tcp.c:2008 [inline]
 [<ffffffff823f5b02>] tcp_shutdown+0xe2/0x110 net/ipv4/tcp.c:1993
 [<ffffffff824a675b>] inet_shutdown+0x17b/0x360 net/ipv4/af_inet.c:825
 [<ffffffff821dcf5b>] SYSC_shutdown net/socket.c:1832 [inline]
 [<ffffffff821dcf5b>] SyS_shutdown+0xfb/0x1a0 net/socket.c:1823
 [<ffffffff8100603d>] do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline]
 [<ffffffff8100603d>] do_fast_syscall_32+0x32d/0xa90 arch/x86/entry/common.c:397
 [<ffffffff8271a350>] sysenter_flags_fixed+0xd/0x1a

Allocated by task 4912:
 [<ffffffff8102e3c6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff81483f22>] save_stack mm/kasan/kasan.c:512 [inline]
 [<ffffffff81483f22>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff81483f22>] kasan_kmalloc.part.0+0x62/0xf0 mm/kasan/kasan.c:616
 [<ffffffff81484197>] kasan_kmalloc+0xb7/0xd0 mm/kasan/kasan.c:601
 [<ffffffff81480521>] __kmalloc+0x141/0x330 mm/slub.c:3613
 [<ffffffff82264216>] kmalloc include/linux/slab.h:481 [inline]
 [<ffffffff82264216>] kzalloc include/linux/slab.h:620 [inline]
 [<ffffffff82264216>] neigh_alloc net/core/neighbour.c:285 [inline]
 [<ffffffff82264216>] __neigh_create+0x1d6/0x1b30 net/core/neighbour.c:457
 [<ffffffff823a024e>] neigh_create include/net/neighbour.h:313 [inline]
 [<ffffffff823a024e>] ipv4_neigh_lookup+0x52e/0x6e0 net/ipv4/route.c:464
 [<ffffffff826b13eb>] dst_neigh_lookup include/net/dst.h:466 [inline]
 [<ffffffff826b13eb>] ip6_tnl_xmit2+0x27b/0x2320 net/ipv6/ip6_tunnel.c:982
 [<ffffffff826b4e59>] ip4ip6_tnl_xmit net/ipv6/ip6_tunnel.c:1134 [inline]
 [<ffffffff826b4e59>] ip6_tnl_xmit+0xa09/0xe00 net/ipv6/ip6_tunnel.c:1212
 [<ffffffff82245071>] __netdev_start_xmit include/linux/netdevice.h:3750 [inline]
 [<ffffffff82245071>] netdev_start_xmit include/linux/netdevice.h:3759 [inline]
 [<ffffffff82245071>] xmit_one net/core/dev.c:2781 [inline]
 [<ffffffff82245071>] dev_hard_start_xmit+0x7c1/0x11e0 net/core/dev.c:2797
 [<ffffffff822473cb>] __dev_queue_xmit+0x164b/0x1bb0 net/core/dev.c:3229
 [<ffffffff82247948>] dev_queue_xmit+0x18/0x20 net/core/dev.c:3263
 [<ffffffff8225c136>] neigh_direct_output+0x16/0x20 net/core/neighbour.c:1369
 [<ffffffff823c5412>] dst_neigh_output include/net/dst.h:461 [inline]
 [<ffffffff823c5412>] ip_finish_output2+0x6a2/0x1280 net/ipv4/ip_output.c:213
 [<ffffffff823cc6e2>] ip_finish_output+0x8b2/0xc60 net/ipv4/ip_output.c:288
 [<ffffffff823d04a7>] NF_HOOK_COND include/linux/netfilter.h:240 [inline]
 [<ffffffff823d04a7>] ip_output+0x227/0x4c0 net/ipv4/ip_output.c:362
 [<ffffffff823cd21c>] dst_output include/net/dst.h:498 [inline]
 [<ffffffff823cd21c>] ip_local_out+0x9c/0x180 net/ipv4/ip_output.c:119
 [<ffffffff823ce58c>] ip_queue_xmit+0x89c/0x1ab0 net/ipv4/ip_output.c:461
 [<ffffffff82431dd4>] __tcp_transmit_skb+0x1904/0x2cf0 net/ipv4/tcp_output.c:1034
 [<ffffffff824337e4>] tcp_transmit_skb net/ipv4/tcp_output.c:1047 [inline]
 [<ffffffff824337e4>] tcp_write_xmit+0x624/0x4570 net/ipv4/tcp_output.c:2137
 [<ffffffff82437fcb>] __tcp_push_pending_frames+0xab/0x2b0 net/ipv4/tcp_output.c:2323
 [<ffffffff8243eeab>] tcp_send_fin+0x15b/0xa90 net/ipv4/tcp_output.c:2899
 [<ffffffff823f5b02>] tcp_shutdown net/ipv4/tcp.c:2008 [inline]
 [<ffffffff823f5b02>] tcp_shutdown+0xe2/0x110 net/ipv4/tcp.c:1993
 [<ffffffff824a675b>] inet_shutdown+0x17b/0x360 net/ipv4/af_inet.c:825
 [<ffffffff821dcf5b>] SYSC_shutdown net/socket.c:1832 [inline]
 [<ffffffff821dcf5b>] SyS_shutdown+0xfb/0x1a0 net/socket.c:1823
 [<ffffffff8100603d>] do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline]
 [<ffffffff8100603d>] do_fast_syscall_32+0x32d/0xa90 arch/x86/entry/common.c:397
 [<ffffffff8271a350>] sysenter_flags_fixed+0xd/0x1a

Freed by task 3850:
 [<ffffffff8102e3c6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff81484820>] save_stack mm/kasan/kasan.c:512 [inline]
 [<ffffffff81484820>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff81484820>] kasan_slab_free+0xb0/0x190 mm/kasan/kasan.c:589
 [<ffffffff81481c44>] slab_free_hook mm/slub.c:1383 [inline]
 [<ffffffff81481c44>] slab_free_freelist_hook mm/slub.c:1405 [inline]
 [<ffffffff81481c44>] slab_free mm/slub.c:2859 [inline]
 [<ffffffff81481c44>] kfree+0xf4/0x310 mm/slub.c:3749
 [<ffffffff821fd036>] skb_free_head net/core/skbuff.c:571 [inline]
 [<ffffffff821fd036>] skb_release_data+0x2e6/0x380 net/core/skbuff.c:602
 [<ffffffff821fd11d>] skb_release_all+0x4d/0x60 net/core/skbuff.c:661
 [<ffffffff821fd257>] __kfree_skb net/core/skbuff.c:675 [inline]
 [<ffffffff821fd257>] kfree_skb+0xf7/0x400 net/core/skbuff.c:696
 [<ffffffff826aa4ab>] ipip6_tunnel_xmit net/ipv6/sit.c:998 [inline]
 [<ffffffff826aa4ab>] sit_tunnel_xmit+0xfdb/0x2610 net/ipv6/sit.c:1030
 [<ffffffff82245071>] __netdev_start_xmit include/linux/netdevice.h:3750 [inline]
 [<ffffffff82245071>] netdev_start_xmit include/linux/netdevice.h:3759 [inline]
 [<ffffffff82245071>] xmit_one net/core/dev.c:2781 [inline]
 [<ffffffff82245071>] dev_hard_start_xmit+0x7c1/0x11e0 net/core/dev.c:2797
 [<ffffffff822473cb>] __dev_queue_xmit+0x164b/0x1bb0 net/core/dev.c:3229
 [<ffffffff82247948>] dev_queue_xmit+0x18/0x20 net/core/dev.c:3263
 [<ffffffff8225c136>] neigh_direct_output+0x16/0x20 net/core/neighbour.c:1369
 [<ffffffff8259f877>] dst_neigh_output include/net/dst.h:461 [inline]
 [<ffffffff8259f877>] ip6_finish_output2+0x9c7/0x1dc0 net/ipv6/ip6_output.c:113
 [<ffffffff825b0203>] ip6_finish_output+0x2f3/0x750 net/ipv6/ip6_output.c:131
 [<ffffffff825b0814>] NF_HOOK_COND include/linux/netfilter.h:240 [inline]
 [<ffffffff825b0814>] ip6_output+0x1b4/0x520 net/ipv6/ip6_output.c:145
 [<ffffffff826bf66c>] dst_output include/net/dst.h:498 [inline]
 [<ffffffff826bf66c>] ip6_local_out+0x9c/0x180 net/ipv6/output_core.c:169
 [<ffffffff825b28c2>] ip6_send_skb+0xa2/0x340 net/ipv6/ip6_output.c:1725
 [<ffffffff82611618>] udp_v6_send_skb+0x438/0xe90 net/ipv6/udp.c:1066
 [<ffffffff826142ed>] udpv6_sendmsg+0x1e3d/0x24f0 net/ipv6/udp.c:1330
 [<ffffffff824a8b42>] inet_sendmsg+0x202/0x4d0 net/ipv4/af_inet.c:755
 [<ffffffff821d838e>] sock_sendmsg_nosec net/socket.c:638 [inline]
 [<ffffffff821d838e>] sock_sendmsg+0xbe/0x110 net/socket.c:648
 [<ffffffff821d9e69>] ___sys_sendmsg+0x369/0x890 net/socket.c:1975
 [<ffffffff821dd386>] __sys_sendmmsg+0x1d6/0x2e0 net/socket.c:2053
 [<ffffffff822ace22>] C_SYSC_sendmmsg net/compat.c:731 [inline]
 [<ffffffff822ace22>] compat_SyS_sendmmsg+0x32/0x40 net/compat.c:728
 [<ffffffff8100603d>] do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline]
 [<ffffffff8100603d>] do_fast_syscall_32+0x32d/0xa90 arch/x86/entry/common.c:397
 [<ffffffff8271a350>] sysenter_flags_fixed+0xd/0x1a

The buggy address belongs to the object at ffff8801da779f80
 which belongs to the cache kmalloc-1024 of size 1024
The buggy address is located 688 bytes inside of
 1024-byte region [ffff8801da779f80, ffff8801da77a380)
The buggy address belongs to the page:
BUG: unable to handle kernel paging request at fffffffc857e4dc0
IP: [<ffffffff811f471e>] cpuacct_charge+0x14e/0x360 kernel/sched/cpuacct.c:247
PGD 2e0d067 PUD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 4899 Comm: syz-executor.5 Not tainted 4.4.174+ #17
task: ffff8801d96d97c0 task.stack: ffff8800bba90000
RIP: 0010:[<ffffffff811f471e>]  [<ffffffff811f471e>] cpuacct_charge+0x14e/0x360 kernel/sched/cpuacct.c:247
RSP: 0018:ffff8801db707988  EFLAGS: 00010046
RAX: 1ffffffff05d2a33 RBX: 00000000000181a8 RCX: fffffffc857e4dc0
RDX: fffffbff90afc9b8 RSI: ffffffff81b0abec RDI: ffffffff82e95198
RBP: ffff8801db7079c8 R08: 0000000000000007 R09: ffff8801d96da1c0
R10: ffffffff82836880 R11: 0000000000000000 R12: ffffffff82e950c0
R13: dffffc0000000000 R14: 00000000544a8f4e R15: ffffffffa04c8030
FS:  0000000000000000(0000) GS:ffff8801db700000(0063) knlGS:00000000f552eb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: fffffffc857e4dc0 CR3: 00000000a2c45000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff811f4630 0000000000000046 0000000000000003 ffff8801cf54afe0
 ffff8801cf54af80 00000000544a8f4e ffff8801cf54b030 0000000000000000
 ffff8801db707a10 ffffffff8117c4a3 0000000000000001 ffff880100000000
Call Trace:
 <IRQ> 
 [<ffffffff8117c4a3>] update_curr+0x2c3/0x6e0 kernel/sched/fair.c:882
 [<ffffffff8119dedf>] enqueue_entity kernel/sched/fair.c:3512 [inline]
 [<ffffffff8119dedf>] enqueue_task_fair+0x10f/0xb6c0 kernel/sched/fair.c:4711
 [<ffffffff811638e4>] enqueue_task kernel/sched/core.c:858 [inline]
 [<ffffffff811638e4>] activate_task+0x154/0x280 kernel/sched/core.c:874
 [<ffffffff81164b5e>] ttwu_activate kernel/sched/core.c:1736 [inline]
 [<ffffffff81164b5e>] ttwu_do_activate.constprop.0+0xbe/0x1e0 kernel/sched/core.c:1789
 [<ffffffff81168041>] ttwu_queue kernel/sched/core.c:1934 [inline]
 [<ffffffff81168041>] try_to_wake_up+0x6d1/0x1110 kernel/sched/core.c:2068
 [<ffffffff81168bc5>] wake_up_process+0x15/0x20 kernel/sched/core.c:2142
 [<ffffffff8111e40e>] wake_up_worker kernel/workqueue.c:846 [inline]
 [<ffffffff8111e40e>] insert_work+0x21e/0x320 kernel/workqueue.c:1318
 [<ffffffff81120033>] __queue_work+0x3e3/0xec0 kernel/workqueue.c:1433
 [<ffffffff81125b4e>] delayed_work_timer_fn+0x6e/0x90 kernel/workqueue.c:1472
 [<ffffffff812582dd>] call_timer_fn+0x18d/0x850 kernel/time/timer.c:1185
 [<ffffffff81258c74>] __run_timers kernel/time/timer.c:1257 [inline]
 [<ffffffff81258c74>] run_timer_softirq+0x2d4/0xb70 kernel/time/timer.c:1444
 [<ffffffff8271bb16>] __do_softirq+0x226/0xa3f kernel/softirq.c:273
 [<ffffffff810e1a8a>] invoke_softirq kernel/softirq.c:350 [inline]
 [<ffffffff810e1a8a>] irq_exit+0x10a/0x150 kernel/softirq.c:391
 [<ffffffff8271b24e>] exiting_irq arch/x86/include/asm/apic.h:652 [inline]
 [<ffffffff8271b24e>] smp_apic_timer_interrupt+0x7e/0xb0 arch/x86/kernel/apic/apic.c:926
 [<ffffffff8271a59d>] apic_timer_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:768
 <EOI> 
 [<ffffffff81299a20>] smp_call_function_many+0x5c0/0x730 kernel/smp.c:435
 [<ffffffff810bbc70>] native_flush_tlb_others+0x110/0x710 arch/x86/mm/tlb.c:325
 [<ffffffff810bc37e>] flush_tlb_others arch/x86/include/asm/paravirt.h:338 [inline]
 [<ffffffff810bc37e>] flush_tlb_mm_range+0x10e/0x550 arch/x86/mm/tlb.c:391
 [<ffffffff81461f77>] flush_tlb_page arch/x86/include/asm/tlbflush.h:300 [inline]
 [<ffffffff81461f77>] ptep_clear_flush+0xe7/0x120 mm/pgtable-generic.c:80
 [<ffffffff81430223>] wp_page_copy.isra.0+0x6e3/0xc70 mm/memory.c:2202
 [<ffffffff81433bda>] do_wp_page+0x23a/0x1340 mm/memory.c:2441
 [<ffffffff8143b2e4>] handle_pte_fault mm/memory.c:3362 [inline]
 [<ffffffff8143b2e4>] __handle_mm_fault mm/memory.c:3474 [inline]
 [<ffffffff8143b2e4>] handle_mm_fault+0x1614/0x3140 mm/memory.c:3503
 [<ffffffff810aaa4e>] __do_page_fault+0x28e/0x7f0 arch/x86/mm/fault.c:1243
 [<ffffffff810ab008>] do_page_fault+0x28/0x30 arch/x86/mm/fault.c:1306
 [<ffffffff82719e35>] page_fault+0x25/0x30 arch/x86/entry/entry_64.S:1064
 [<ffffffff814b17a4>] pipe_read+0x274/0x860 fs/pipe.c:270
 [<ffffffff81496725>] new_sync_read fs/read_write.c:424 [inline]
 [<ffffffff81496725>] __vfs_read+0x2e5/0x3c0 fs/read_write.c:436
 [<ffffffff81498264>] vfs_read+0x134/0x360 fs/read_write.c:456
 [<ffffffff8149aa8c>] SYSC_read fs/read_write.c:571 [inline]
 [<ffffffff8149aa8c>] SyS_read+0xdc/0x1c0 fs/read_write.c:564
 [<ffffffff8100603d>] do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline]
 [<ffffffff8100603d>] do_fast_syscall_32+0x32d/0xa90 arch/x86/entry/common.c:397
 [<ffffffff8271a350>] sysenter_flags_fixed+0xd/0x1a
Code: 49 8d bc 24 d8 00 00 00 48 89 f8 48 c1 e8 03 42 80 3c 28 00 0f 85 ba 01 00 00 49 8b 9c 24 d8 00 00 00 80 3a 00 0f 85 8c 01 00 00 <4a> 03 1c fd 40 4c 1a 83 48 89 d8 48 c1 e8 03 42 80 3c 28 00 0f 
RIP  [<ffffffff811f471e>] cpuacct_charge+0x14e/0x360 kernel/sched/cpuacct.c:247
 RSP <ffff8801db707988>
CR2: fffffffc857e4dc0
---[ end trace 43da33e465025fbf ]---