IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready
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BUG: KCSAN: data-race in fib6_ifup / find_match

read to 0xffff88811f4b6daf of 1 bytes by interrupt on cpu 0:
 find_match+0x52/0x7f0 net/ipv6/route.c:744
 __find_rr_leaf+0xe3/0x780 net/ipv6/route.c:835
 find_rr_leaf net/ipv6/route.c:856 [inline]
 rt6_select net/ipv6/route.c:900 [inline]
 fib6_table_lookup+0x383/0x650 net/ipv6/route.c:2168
 ip6_pol_route+0xee/0x730 net/ipv6/route.c:2204
 ip6_pol_route_input+0x4d/0x70 net/ipv6/route.c:2262
 fib6_rule_lookup+0x95/0x470 net/ipv6/fib6_rules.c:114
 ip6_route_input_lookup+0x9f/0xc0 net/ipv6/route.c:2274
 ip6_route_input+0x41e/0x4b0 net/ipv6/route.c:2443
 ip6_rcv_finish_core.isra.0+0x97/0x1f0 net/ipv6/ip6_input.c:63
 ip6_rcv_finish+0xee/0x140 net/ipv6/ip6_input.c:74
 NF_HOOK include/linux/netfilter.h:307 [inline]
 NF_HOOK include/linux/netfilter.h:301 [inline]
 ipv6_rcv+0x1a1/0x1b0 net/ipv6/ip6_input.c:306
 __netif_receive_skb_one_core+0xa7/0xe0 net/core/dev.c:5150
 __netif_receive_skb+0x37/0xf0 net/core/dev.c:5264
 process_backlog+0x207/0x4b0 net/core/dev.c:6095
 napi_poll net/core/dev.c:6532 [inline]
 net_rx_action+0x3ae/0xa90 net/core/dev.c:6600
 __do_softirq+0x115/0x33f kernel/softirq.c:292
 run_ksoftirqd+0x46/0x60 kernel/softirq.c:603
 smpboot_thread_fn+0x37d/0x4a0 kernel/smpboot.c:165
 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

write to 0xffff88811f4b6daf of 1 bytes by task 3610 on cpu 1:
 fib6_ifup+0xd7/0x100 net/ipv6/route.c:4592
 fib6_clean_node+0x194/0x310 net/ipv6/ip6_fib.c:2099
 fib6_walk_continue+0x2e3/0x440 net/ipv6/ip6_fib.c:2024
 fib6_walk+0x10d/0x160 net/ipv6/ip6_fib.c:2072
 fib6_clean_tree+0xef/0x120 net/ipv6/ip6_fib.c:2152
 __fib6_clean_all+0xbd/0x150 net/ipv6/ip6_fib.c:2168
 fib6_clean_all+0x34/0x50 net/ipv6/ip6_fib.c:2179
 rt6_sync_up+0x9f/0x110 net/ipv6/route.c:4612
 addrconf_notify+0x254/0x1550 net/ipv6/addrconf.c:3604
 notifier_call_chain+0xd7/0x160 kernel/notifier.c:83
 __raw_notifier_call_chain kernel/notifier.c:361 [inline]
 raw_notifier_call_chain+0x37/0x50 kernel/notifier.c:368
 call_netdevice_notifiers_info net/core/dev.c:1893 [inline]
 call_netdevice_notifiers_info+0x9a/0x120 net/core/dev.c:1878
 netdev_state_change net/core/dev.c:1378 [inline]
 netdev_state_change+0xb2/0xd0 net/core/dev.c:1371
 linkwatch_do_dev+0xd8/0xf0 net/core/link_watch.c:159
 __linkwatch_run_queue+0x1a9/0x510 net/core/link_watch.c:204
 linkwatch_event+0x54/0x70 net/core/link_watch.c:243
 process_one_work+0x3d4/0x890 kernel/workqueue.c:2264
 worker_thread+0xa0/0x800 kernel/workqueue.c:2410
 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3610 Comm: kworker/1:2 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events linkwatch_event
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