IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
==================================================================
BUG: KASAN: slab-out-of-bounds in ip6_tnl_xmit2+0x2043/0x20d0 net/ipv6/ip6_tunnel.c:987
Read of size 16 at addr ffff8801d8c9e6b0 by task syz-executor247/3706

CPU: 0 PID: 3706 Comm: syz-executor247 Not tainted 4.4.129-g23eaecc #27
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 5725feeea7834f35 ffff8801ce697000 ffffffff81e0dc8d
 ffffea0007632700 ffff8801d8c9e6b0 0000000000000000 ffff8801d8c9e6b8
 ffff8801cdebc400 ffff8801ce697038 ffffffff8151535c ffff8801d8c9e6b0
Call Trace:
 [<ffffffff81e0dc8d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81e0dc8d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff8151535c>] print_address_description+0x6c/0x216 mm/kasan/report.c:252
 [<ffffffff8151567b>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff8151567b>] kasan_report.cold.7+0x175/0x2f7 mm/kasan/report.c:408
 [<ffffffff814f924f>] __asan_report_load_n_noabort+0xf/0x20 mm/kasan/report.c:439
 [<ffffffff83543fb3>] ip6_tnl_xmit2+0x2043/0x20d0 net/ipv6/ip6_tunnel.c:987
 [<ffffffff83544950>] ip4ip6_tnl_xmit net/ipv6/ip6_tunnel.c:1129 [inline]
 [<ffffffff83544950>] ip6_tnl_xmit+0x910/0xc60 net/ipv6/ip6_tunnel.c:1203
 [<ffffffff82f87831>] __netdev_start_xmit include/linux/netdevice.h:3743 [inline]
 [<ffffffff82f87831>] netdev_start_xmit include/linux/netdevice.h:3752 [inline]
 [<ffffffff82f87831>] xmit_one net/core/dev.c:2759 [inline]
 [<ffffffff82f87831>] dev_hard_start_xmit+0x7b1/0x11c0 net/core/dev.c:2775
 [<ffffffff82f89bc0>] __dev_queue_xmit+0x16c0/0x1c80 net/core/dev.c:3207
 [<ffffffff82f8a197>] dev_queue_xmit+0x17/0x20 net/core/dev.c:3241
 [<ffffffff82f9b995>] neigh_direct_output+0x15/0x20 net/core/neighbour.c:1358
 [<ffffffff83213b5b>] dst_neigh_output include/net/dst.h:461 [inline]
 [<ffffffff83213b5b>] ip_finish_output2+0x6ab/0x1110 net/ipv4/ip_output.c:213
 [<ffffffff83215f4b>] ip_do_fragment+0x198b/0x2150 net/ipv4/ip_output.c:633
 [<ffffffff83216853>] ip_fragment.constprop.50+0x143/0x200 net/ipv4/ip_output.c:503
 [<ffffffff83216fd4>] ip_finish_output+0x6c4/0xbc0 net/ipv4/ip_output.c:286
 [<ffffffff8321a103>] NF_HOOK_COND include/linux/netfilter.h:240 [inline]
 [<ffffffff8321a103>] ip_mc_output+0x233/0x980 net/ipv4/ip_output.c:347
 [<ffffffff832179ab>] dst_output include/net/dst.h:498 [inline]
 [<ffffffff832179ab>] ip_local_out+0x9b/0x180 net/ipv4/ip_output.c:119
 [<ffffffff8321d64c>] ip_send_skb+0x3c/0xc0 net/ipv4/ip_output.c:1450
 [<ffffffff832c5a13>] udp_send_skb+0x5c3/0xc60 net/ipv4/udp.c:842
 [<ffffffff832ce5ce>] udp_sendmsg+0x16ce/0x1bb0 net/ipv4/udp.c:1070
 [<ffffffff832fe123>] inet_sendmsg+0x203/0x4d0 net/ipv4/af_inet.c:755
 [<ffffffff82f1c41c>] sock_sendmsg_nosec net/socket.c:625 [inline]
 [<ffffffff82f1c41c>] sock_sendmsg+0xcc/0x110 net/socket.c:635
 [<ffffffff82f1d0fc>] SYSC_sendto+0x21c/0x370 net/socket.c:1665
 [<ffffffff82f1f780>] SyS_sendto+0x40/0x50 net/socket.c:1633
 [<ffffffff838bf0e5>] entry_SYSCALL_64_fastpath+0x22/0x9e

Allocated by task 3706:
 [<ffffffff810341d6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814f8223>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814f8507>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814f8507>] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:616
 [<ffffffff814f4c24>] __kmalloc+0x124/0x310 mm/slub.c:3613
 [<ffffffff82fac6b6>] kmalloc include/linux/slab.h:481 [inline]
 [<ffffffff82fac6b6>] kzalloc include/linux/slab.h:620 [inline]
 [<ffffffff82fac6b6>] neigh_alloc net/core/neighbour.c:285 [inline]
 [<ffffffff82fac6b6>] __neigh_create+0x1d6/0x1b20 net/core/neighbour.c:457
 [<ffffffff831ecc3d>] neigh_create include/net/neighbour.h:313 [inline]
 [<ffffffff831ecc3d>] ipv4_neigh_lookup+0x4dd/0x700 net/ipv4/route.c:464
 [<ffffffff83542583>] dst_neigh_lookup include/net/dst.h:466 [inline]
 [<ffffffff83542583>] ip6_tnl_xmit2+0x613/0x20d0 net/ipv6/ip6_tunnel.c:982
 [<ffffffff83544950>] ip4ip6_tnl_xmit net/ipv6/ip6_tunnel.c:1129 [inline]
 [<ffffffff83544950>] ip6_tnl_xmit+0x910/0xc60 net/ipv6/ip6_tunnel.c:1203
 [<ffffffff82f87831>] __netdev_start_xmit include/linux/netdevice.h:3743 [inline]
 [<ffffffff82f87831>] netdev_start_xmit include/linux/netdevice.h:3752 [inline]
 [<ffffffff82f87831>] xmit_one net/core/dev.c:2759 [inline]
 [<ffffffff82f87831>] dev_hard_start_xmit+0x7b1/0x11c0 net/core/dev.c:2775
 [<ffffffff82f89bc0>] __dev_queue_xmit+0x16c0/0x1c80 net/core/dev.c:3207
 [<ffffffff82f8a197>] dev_queue_xmit+0x17/0x20 net/core/dev.c:3241
 [<ffffffff82f9b995>] neigh_direct_output+0x15/0x20 net/core/neighbour.c:1358
 [<ffffffff83213b5b>] dst_neigh_output include/net/dst.h:461 [inline]
 [<ffffffff83213b5b>] ip_finish_output2+0x6ab/0x1110 net/ipv4/ip_output.c:213
 [<ffffffff83215f4b>] ip_do_fragment+0x198b/0x2150 net/ipv4/ip_output.c:633
 [<ffffffff83216853>] ip_fragment.constprop.50+0x143/0x200 net/ipv4/ip_output.c:503
 [<ffffffff83216fd4>] ip_finish_output+0x6c4/0xbc0 net/ipv4/ip_output.c:286
 [<ffffffff8321a103>] NF_HOOK_COND include/linux/netfilter.h:240 [inline]
 [<ffffffff8321a103>] ip_mc_output+0x233/0x980 net/ipv4/ip_output.c:347
 [<ffffffff832179ab>] dst_output include/net/dst.h:498 [inline]
 [<ffffffff832179ab>] ip_local_out+0x9b/0x180 net/ipv4/ip_output.c:119
 [<ffffffff8321d64c>] ip_send_skb+0x3c/0xc0 net/ipv4/ip_output.c:1450
 [<ffffffff832c5a13>] udp_send_skb+0x5c3/0xc60 net/ipv4/udp.c:842
 [<ffffffff832ce5ce>] udp_sendmsg+0x16ce/0x1bb0 net/ipv4/udp.c:1070
 [<ffffffff832fe123>] inet_sendmsg+0x203/0x4d0 net/ipv4/af_inet.c:755
 [<ffffffff82f1c41c>] sock_sendmsg_nosec net/socket.c:625 [inline]
 [<ffffffff82f1c41c>] sock_sendmsg+0xcc/0x110 net/socket.c:635
 [<ffffffff82f1d0fc>] SYSC_sendto+0x21c/0x370 net/socket.c:1665
 [<ffffffff82f1f780>] SyS_sendto+0x40/0x50 net/socket.c:1633
 [<ffffffff838bf0e5>] entry_SYSCALL_64_fastpath+0x22/0x9e

Freed by task 2371:
 [<ffffffff810341d6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814f8223>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814f8b52>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814f8b52>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589
 [<ffffffff814f6054>] slab_free_hook mm/slub.c:1383 [inline]
 [<ffffffff814f6054>] slab_free_freelist_hook mm/slub.c:1405 [inline]
 [<ffffffff814f6054>] slab_free mm/slub.c:2859 [inline]
 [<ffffffff814f6054>] kfree+0xf4/0x310 mm/slub.c:3749
 [<ffffffff81537c60>] free_pipe_info+0x210/0x2c0 fs/pipe.c:654
 [<ffffffff81537dc8>] put_pipe_info+0xb8/0xe0 fs/pipe.c:548
 [<ffffffff81537f9f>] pipe_release+0x1af/0x250 fs/pipe.c:569
 [<ffffffff81522745>] __fput+0x235/0x6f0 fs/file_table.c:208
 [<ffffffff81522c85>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff8118bb8f>] task_work_run+0x10f/0x190 kernel/task_work.c:115
 [<ffffffff8100362d>] tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 [<ffffffff8100362d>] exit_to_usermode_loop+0x13d/0x160 arch/x86/entry/common.c:252
 [<ffffffff81006535>] prepare_exit_to_usermode arch/x86/entry/common.c:283 [inline]
 [<ffffffff81006535>] syscall_return_slowpath+0x1b5/0x1f0 arch/x86/entry/common.c:348
 [<ffffffff838bf275>] int_ret_from_sys_call+0x25/0xa3

The buggy address belongs to the object at ffff8801d8c9e400
 which belongs to the cache kmalloc-1024 of size 1024
The buggy address is located 688 bytes inside of
 1024-byte region [ffff8801d8c9e400, ffff8801d8c9e800)
The buggy address belongs to the page:
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.129-g23eaecc #27
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d9a41800 task.stack: ffff8801d9a50000
RIP: 0010:[<ffffffff81e6f347>]  [<ffffffff81e6f347>] lookup_object lib/debugobjects.c:120 [inline]
RIP: 0010:[<ffffffff81e6f347>]  [<ffffffff81e6f347>] debug_object_activate+0x1b7/0x480 lib/debugobjects.c:405
RSP: 0018:ffff8801db307bb0  EFLAGS: 00010802
RAX: dffffc0000000000 RBX: 8000000000004080 RCX: ffffffff85a3b128
RDX: 1000000000000813 RSI: ffff8801d9a42108 RDI: 8000000000004098
RBP: ffff8801db307c68 R08: 0000000000000096 R09: 0000000000000001
R10: 0000000000000001 R11: ffff8801d9a41800 R12: 1ffff1003b660f78
R13: ffff8800bafc0f78 R14: 0000000000000004 R15: ffffffff8448fc40
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa50d0771b0 CR3: 00000001d1916000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801d9a41800 ffffffff85a3b128 0000000041b58ab3 ffffffff84208c0f
 ffffffff81e6f190 ffff8801d9a420d8 0000000000000000 0000000000000000
 0000000000000005 ffff8800bafc0f78 ffffffff8448fc40 ffffffff85390520
Call Trace:
 <IRQ> 
 [<ffffffff8117bec8>] debug_work_activate kernel/workqueue.c:499 [inline]
 [<ffffffff8117bec8>] __queue_work+0x48/0xea0 kernel/workqueue.c:1354
 [<ffffffff8117cd88>] delayed_work_timer_fn+0x68/0x90 kernel/workqueue.c:1472
 [<ffffffff8129085c>] call_timer_fn+0x18c/0x870 kernel/time/timer.c:1185
 [<ffffffff8129145d>] __run_timers kernel/time/timer.c:1257 [inline]
 [<ffffffff8129145d>] run_timer_softirq+0x51d/0xb90 kernel/time/timer.c:1444
 [<ffffffff838c25ac>] __do_softirq+0x22c/0xa1a kernel/softirq.c:273
 [<ffffffff8113f75d>] invoke_softirq kernel/softirq.c:350 [inline]
 [<ffffffff8113f75d>] irq_exit+0x10d/0x140 kernel/softirq.c:391
 [<ffffffff838c1d11>] exiting_irq arch/x86/include/asm/apic.h:653 [inline]
 [<ffffffff838c1d11>] smp_apic_timer_interrupt+0x81/0xa0 arch/x86/kernel/apic/apic.c:926
 [<ffffffff838c0c50>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:741
 <EOI> 
 [<ffffffff81025da5>] arch_safe_halt arch/x86/include/asm/paravirt.h:117 [inline]
 [<ffffffff81025da5>] default_idle+0x55/0x3c0 arch/x86/kernel/process.c:290
 [<ffffffff810272f0>] arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:281
 [<ffffffff8121b9e7>] default_idle_call+0x57/0x70 kernel/sched/idle.c:93
 [<ffffffff8121c18f>] cpuidle_idle_call kernel/sched/idle.c:157 [inline]
 [<ffffffff8121c18f>] cpu_idle_loop kernel/sched/idle.c:253 [inline]
 [<ffffffff8121c18f>] cpu_startup_entry+0x6af/0x780 kernel/sched/idle.c:301
 [<ffffffff810aa174>] start_secondary+0x324/0x400 arch/x86/kernel/smpboot.c:242
Code: 8c 02 00 00 48 8b 1b 41 be 01 00 00 00 48 85 db 74 46 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 18 41 83 c6 01 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 e6 01 00 00 4c 3b 6b 18 0f 84 9e 00 00 00 48 
RIP  [<ffffffff81e6f347>] lookup_object lib/debugobjects.c:120 [inline]
RIP  [<ffffffff81e6f347>] debug_object_activate+0x1b7/0x480 lib/debugobjects.c:405
 RSP <ffff8801db307bb0>
---[ end trace cdcd355bd3db684a ]---