syzbot

IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
8021q: adding VLAN 0 to HW filter on device team0
8021q: adding VLAN 0 to HW filter on device team0
==================================================================
BUG: KASAN: alloca-out-of-bounds in tick_sched_handle+0x16c/0x180 kernel/time/tick-sched.c:173
Read of size 8 at addr ffff8801c8e772f0 by task ip/6380

CPU: 0 PID: 6380 Comm: ip Not tainted 4.16.0+ #2
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1b9/0x294 lib/dump_stack.c:113
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0xac/0x2f5 mm/kasan/report.c:412
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
 tick_sched_handle+0x16c/0x180 kernel/time/tick-sched.c:173
 tick_sched_timer+0x45/0x130 kernel/time/tick-sched.c:1283
 __run_hrtimer kernel/time/hrtimer.c:1386 [inline]
 __hrtimer_run_queues+0x3e3/0x10a0 kernel/time/hrtimer.c:1448
 hrtimer_interrupt+0x286/0x650 kernel/time/hrtimer.c:1506
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline]
 smp_apic_timer_interrupt+0x15d/0x710 arch/x86/kernel/apic/apic.c:1050
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:862
 </IRQ>
RIP: 0010:kasan_unpoison_shadow+0x1/0x50 mm/kasan/kasan.c:68
RSP: 0018:ffff8801c8e77318 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13
RAX: ffff8801ca414000 RBX: 0000000000000000 RCX: ffffffff85c6809f
RDX: 0000000000000000 RSI: 0000000000000078 RDI: ffff8801c8e772c0
RBP: ffff8801c8e77328 R08: ffff8801ca414000 R09: ffffed00391cee5d
R10: ffffed00391cee95 R11: ffff8801c8e774af R12: ffff8801c8e77740
R13: ffff8801af531d40 R14: 0000000000000000 R15: 00000000ffffffed
 put_net include/net/net_namespace.h:225 [inline]
 rtnl_newlink+0x1094/0x1a40 net/core/rtnetlink.c:3070
 rtnetlink_rcv_msg+0x466/0xc10 net/core/rtnetlink.c:4646
 netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2448
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4664
 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline]
 netlink_unicast+0x58b/0x740 net/netlink/af_netlink.c:1336
 netlink_sendmsg+0x9f0/0xfa0 net/netlink/af_netlink.c:1901
 sock_sendmsg_nosec net/socket.c:629 [inline]
 sock_sendmsg+0xd5/0x120 net/socket.c:639
 __sys_sendto+0x3d7/0x670 net/socket.c:1789
 SYSC_sendto net/socket.c:1801 [inline]
 SyS_sendto+0x40/0x60 net/socket.c:1797
 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x7f9e00d48282
RSP: 002b:00007ffea05bf660 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f9e00d48282
RDX: 0000000000000020 RSI: 00007ffea05bf6a0 RDI: 0000000000000003
RBP: 00007ffea05c0f59 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 00007ffea05bfe20 R14: 00007ffea05bfe28 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea0007239dc0 count:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: 0000000000000000 ffffea0007230101 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c8e77180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801c8e77200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801c8e77280: 00 00 00 00 00 00 00 00 ca ca ca ca 00 cb cb cb
                                                             ^
 ffff8801c8e77300: cb cb cb cb 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801c8e77380: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1
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