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BUG: KCSAN: data-race in icmp_global_allow / icmp_global_allow

read to 0xffffffff861a8014 of 4 bytes by task 10165 on cpu 1:
 icmp_global_allow+0x36/0x1b0 net/ipv4/icmp.c:254
 icmpv4_global_allow net/ipv4/icmp.c:299 [inline]
 icmpv4_global_allow+0x83/0xc0 net/ipv4/icmp.c:294
 __icmp_send+0x925/0xaa0 net/ipv4/icmp.c:664
 ipv4_send_dest_unreach net/ipv4/route.c:1220 [inline]
 ipv4_link_failure+0x22d/0x400 net/ipv4/route.c:1227
 dst_link_failure include/net/dst.h:419 [inline]
 vti6_xmit net/ipv6/ip6_vti.c:510 [inline]
 vti6_tnl_xmit+0x9dc/0xe30 net/ipv6/ip6_vti.c:549
 __netdev_start_xmit include/linux/netdevice.h:4420 [inline]
 netdev_start_xmit include/linux/netdevice.h:4434 [inline]
 xmit_one net/core/dev.c:3280 [inline]
 dev_hard_start_xmit+0xef/0x430 net/core/dev.c:3296
 __dev_queue_xmit+0x14c9/0x1b60 net/core/dev.c:3873
 dev_queue_xmit+0x21/0x30 net/core/dev.c:3906
 neigh_direct_output+0x1f/0x30 net/core/neighbour.c:1530
 neigh_output include/net/neighbour.h:511 [inline]
 ip_finish_output2+0x4af/0xe40 net/ipv4/ip_output.c:228
 __ip_finish_output net/ipv4/ip_output.c:308 [inline]
 __ip_finish_output+0x23a/0x490 net/ipv4/ip_output.c:290
 ip_finish_output+0x41/0x160 net/ipv4/ip_output.c:318
 NF_HOOK_COND include/linux/netfilter.h:294 [inline]
 ip_output+0xdf/0x210 net/ipv4/ip_output.c:432
 dst_output include/net/dst.h:436 [inline]
 ip_local_out+0x74/0x90 net/ipv4/ip_output.c:125

write to 0xffffffff861a8014 of 4 bytes by task 10160 on cpu 0:
 icmp_global_allow+0x174/0x1b0 net/ipv4/icmp.c:272
 icmpv4_global_allow net/ipv4/icmp.c:299 [inline]
 icmpv4_global_allow+0x83/0xc0 net/ipv4/icmp.c:294
 __icmp_send+0x925/0xaa0 net/ipv4/icmp.c:664
 ipv4_send_dest_unreach net/ipv4/route.c:1220 [inline]
 ipv4_link_failure+0x22d/0x400 net/ipv4/route.c:1227
 dst_link_failure include/net/dst.h:419 [inline]
 vti6_xmit net/ipv6/ip6_vti.c:510 [inline]
 vti6_tnl_xmit+0x9dc/0xe30 net/ipv6/ip6_vti.c:549
 __netdev_start_xmit include/linux/netdevice.h:4420 [inline]
 netdev_start_xmit include/linux/netdevice.h:4434 [inline]
 xmit_one net/core/dev.c:3280 [inline]
 dev_hard_start_xmit+0xef/0x430 net/core/dev.c:3296
 __dev_queue_xmit+0x14c9/0x1b60 net/core/dev.c:3873
 dev_queue_xmit+0x21/0x30 net/core/dev.c:3906
 neigh_direct_output+0x1f/0x30 net/core/neighbour.c:1530
 neigh_output include/net/neighbour.h:511 [inline]
 ip_finish_output2+0x4af/0xe40 net/ipv4/ip_output.c:228
 __ip_finish_output net/ipv4/ip_output.c:308 [inline]
 __ip_finish_output+0x23a/0x490 net/ipv4/ip_output.c:290
 ip_finish_output+0x41/0x160 net/ipv4/ip_output.c:318
 NF_HOOK_COND include/linux/netfilter.h:294 [inline]
 ip_output+0xdf/0x210 net/ipv4/ip_output.c:432

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 10160 Comm: syz-executor.3 Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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