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BUG: KCSAN: data-race in rcu_gp_fqs_check_wake / rcu_note_context_switch

write to 0xffffffff85a7d1d0 of 8 bytes by task 45 on cpu 0:
 rcu_preempt_ctxt_queue kernel/rcu/tree_plugin.h:223 [inline]
 rcu_note_context_switch+0x6f6/0x760 kernel/rcu/tree_plugin.h:315
 __schedule+0xa4/0x690 kernel/sched/core.c:4016
 preempt_schedule_common+0x37/0x90 kernel/sched/core.c:4226
 preempt_schedule+0x30/0x40 kernel/sched/core.c:4251
 ___preempt_schedule+0x16/0x20 arch/x86/entry/thunk_64.S:50
 __local_bh_enable_ip+0x44/0x80 kernel/softirq.c:196
 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:176 [inline]
 _raw_spin_unlock_bh+0x3f/0x50 kernel/locking/spinlock.c:207
 spin_unlock_bh include/linux/spinlock.h:383 [inline]
 sctp_inet6addr_event+0x3e8/0x440 net/sctp/ipv6.c:94
 notifier_call_chain+0xd7/0x160 kernel/notifier.c:95
 __atomic_notifier_call_chain kernel/notifier.c:185 [inline]
 atomic_notifier_call_chain+0x3c/0x60 kernel/notifier.c:195
 inet6addr_notifier_call_chain+0x2e/0x40 net/ipv6/addrconf_core.c:109
 ipv6_add_addr+0xbc5/0xd30 net/ipv6/addrconf.c:1150
 addrconf_add_linklocal+0x15f/0x250 net/ipv6/addrconf.c:3190
 addrconf_addr_gen+0x1ff/0x230 net/ipv6/addrconf.c:3317
 addrconf_dev_config+0x1c0/0x280 net/ipv6/addrconf.c:3360
 addrconf_notify+0x1fa/0x1480 net/ipv6/addrconf.c:3595
 notifier_call_chain+0xd7/0x160 kernel/notifier.c:95
 __raw_notifier_call_chain kernel/notifier.c:396 [inline]
 raw_notifier_call_chain+0x37/0x50 kernel/notifier.c:403
 call_netdevice_notifiers_info+0x48/0xc0 net/core/dev.c:1668
 netdev_state_change net/core/dev.c:1271 [inline]
 netdev_state_change+0xb2/0xd0 net/core/dev.c:1264
 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:2269
 worker_thread+0xa0/0x800 kernel/workqueue.c:2415
 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

read to 0xffffffff85a7d1d0 of 8 bytes by task 10 on cpu 1:
 rcu_gp_fqs_check_wake kernel/rcu/tree.c:1584 [inline]
 rcu_gp_fqs_check_wake+0x93/0xd0 kernel/rcu/tree.c:1574
 rcu_gp_fqs_loop+0x36c/0x580 kernel/rcu/tree.c:1639
 rcu_gp_kthread+0x143/0x230 kernel/rcu/tree.c:1799
 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: 10 Comm: rcu_preempt Not tainted 5.4.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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