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BUG: KASAN: slab-out-of-bounds in icmpv6_xrlim_allow+0x409/0x440 net/ipv6/icmp.c:216
Read of size 8 at addr ffff88809f7701ff by task swapper/0/0

CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.2.0-rc2+ #13
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+0x172/0x1f0 lib/dump_stack.c:113
 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:188
 __kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317
 kasan_report+0x12/0x20 mm/kasan/common.c:614
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132
 icmpv6_xrlim_allow+0x409/0x440 net/ipv6/icmp.c:216
 icmp6_send+0x1107/0x1e50 net/ipv6/icmp.c:540
 icmpv6_send+0xec/0x230 net/ipv6/ip6_icmp.c:43
 ip6_link_failure+0x2b/0x530 net/ipv6/route.c:2367
 dst_link_failure include/net/dst.h:416 [inline]
 ndisc_error_report+0xce/0x1c0 net/ipv6/ndisc.c:712
 neigh_invalidate+0x245/0x570 net/core/neighbour.c:1000
 neigh_timer_handler+0xc33/0xf30 net/core/neighbour.c:1086
 call_timer_fn+0x193/0x720 kernel/time/timer.c:1322
 expire_timers kernel/time/timer.c:1366 [inline]
 __run_timers kernel/time/timer.c:1685 [inline]
 __run_timers kernel/time/timer.c:1653 [inline]
 run_timer_softirq+0x66f/0x1740 kernel/time/timer.c:1698
 __do_softirq+0x25c/0x94c kernel/softirq.c:293
 invoke_softirq kernel/softirq.c:374 [inline]
 irq_exit+0x180/0x1d0 kernel/softirq.c:414
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x13b/0x550 arch/x86/kernel/apic/apic.c:1068
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:806
 </IRQ>
RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61
Code: ff ff 48 89 df e8 02 fe 8b fa eb 82 e9 07 00 00 00 0f 00 2d c4 7f 4a 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d b4 7f 4a 00 fb f4 <c3> 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 6e 4f 41 fa e8 49
RSP: 0018:ffffffff88a07cf8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff1164e81 RBX: ffffffff88a7a100 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffffffff88a7a97c
RBP: ffffffff88a07d28 R08: ffffffff88a7a100 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff88b273f8 R14: 0000000000000000 R15: 0000000000000000
 arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:571
 default_idle_call+0x36/0x90 kernel/sched/idle.c:94
 cpuidle_idle_call kernel/sched/idle.c:154 [inline]
 do_idle+0x377/0x560 kernel/sched/idle.c:263
 cpu_startup_entry+0x1b/0x20 kernel/sched/idle.c:354
 rest_init+0x245/0x37b init/main.c:451
 arch_call_rest_init+0xe/0x1b
 start_kernel+0x854/0x893 init/main.c:761
 x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:470
 x86_64_start_kernel+0x77/0x7b arch/x86/kernel/head64.c:451
 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243

Allocated by task 11918:
 save_stack+0x23/0x90 mm/kasan/common.c:71
 set_track mm/kasan/common.c:79 [inline]
 __kasan_kmalloc mm/kasan/common.c:489 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:462
 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:497
 slab_post_alloc_hook mm/slab.h:437 [inline]
 slab_alloc mm/slab.c:3326 [inline]
 kmem_cache_alloc+0x11a/0x6f0 mm/slab.c:3488
 dst_alloc+0x10e/0x200 net/core/dst.c:93
 ip6_dst_alloc+0x34/0xa0 net/ipv6/route.c:356
 ip6_rt_pcpu_alloc net/ipv6/route.c:1257 [inline]
 rt6_make_pcpu_route net/ipv6/route.c:1287 [inline]
 ip6_pol_route+0x649/0x1010 net/ipv6/route.c:2031
 ip6_pol_route_output+0x54/0x70 net/ipv6/route.c:2204
 fib6_rule_lookup+0x133/0x5a0 net/ipv6/fib6_rules.c:116
 ip6_route_output_flags+0x2c4/0x350 net/ipv6/route.c:2233
 ip6_route_output include/net/ip6_route.h:89 [inline]
 ip6_dst_lookup_tail+0xd10/0x1b30 net/ipv6/ip6_output.c:1027
 ip6_dst_lookup_flow+0xa8/0x220 net/ipv6/ip6_output.c:1155
 ip6_sk_dst_lookup_flow net/ipv6/ip6_output.c:1193 [inline]
 ip6_sk_dst_lookup_flow+0x62a/0xb90 net/ipv6/ip6_output.c:1183
 udpv6_sendmsg+0x17ad/0x28d0 net/ipv6/udp.c:1452
 inet_sendmsg+0x141/0x5d0 net/ipv4/af_inet.c:802
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xd7/0x130 net/socket.c:671
 ___sys_sendmsg+0x803/0x920 net/socket.c:2292
 __sys_sendmsg+0x105/0x1d0 net/socket.c:2330
 __do_sys_sendmsg net/socket.c:2339 [inline]
 __se_sys_sendmsg net/socket.c:2337 [inline]
 __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2337
 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 8828:
 save_stack+0x23/0x90 mm/kasan/common.c:71
 set_track mm/kasan/common.c:79 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:451
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:459
 __cache_free mm/slab.c:3432 [inline]
 kmem_cache_free+0x86/0x260 mm/slab.c:3698
 dst_destroy+0x29e/0x3c0 net/core/dst.c:129
 dst_destroy_rcu+0x16/0x19 net/core/dst.c:142
 __rcu_reclaim kernel/rcu/rcu.h:222 [inline]
 rcu_do_batch kernel/rcu/tree.c:2092 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2310 [inline]
 rcu_core+0xba5/0x1500 kernel/rcu/tree.c:2291
 __do_softirq+0x25c/0x94c kernel/softirq.c:293

The buggy address belongs to the object at ffff88809f7700c0
 which belongs to the cache ip6_dst_cache of size 224
The buggy address is located 95 bytes to the right of
 224-byte region [ffff88809f7700c0, ffff88809f7701a0)
The buggy address belongs to the page:
page:ffffea00027ddc00 refcount:1 mapcount:0 mapping:ffff888216a3de40 index:0xffff88809f770980
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea00028f93c8 ffffea000260d708 ffff888216a3de40
raw: ffff88809f770980 ffff88809f7700c0 0000000100000009 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809f770080: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
 ffff88809f770100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88809f770180: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc
                                                                ^
 ffff88809f770200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88809f770280: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
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