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BUG: KCSAN: data-race in rcu_gp_fqs_check_wake / rcu_note_context_switch

write to 0xffffffff85a7f190 of 8 bytes by task 9162 on cpu 1:
 rcu_preempt_ctxt_queue kernel/rcu/tree_plugin.h:223 [inline]
 rcu_note_context_switch+0x72e/0x7a0 kernel/rcu/tree_plugin.h:316
 __schedule+0xa4/0x5d0 kernel/sched/core.c:3822
 preempt_schedule_common+0x37/0x90 kernel/sched/core.c:4028
 preempt_schedule+0x30/0x40 kernel/sched/core.c:4054
 ___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]
 rt_add_uncached_list+0x106/0x130 net/ipv4/route.c:1511
 rt_set_nexthop.constprop.0+0x20b/0x970 net/ipv4/route.c:1605
 __mkroute_output net/ipv4/route.c:2428 [inline]
 ip_route_output_key_hash_rcu+0x5d2/0x15a0 net/ipv4/route.c:2627
 ip_route_output_key_hash+0xd0/0x110 net/ipv4/route.c:2456
 __ip_route_output_key include/net/route.h:125 [inline]
 ip_route_output_flow+0x31/0xb0 net/ipv4/route.c:2714
 ip_route_output_key include/net/route.h:135 [inline]
 sctp_v4_get_dst+0x228/0x7e0 net/sctp/protocol.c:435
 sctp_transport_route+0xb2/0x1e0 net/sctp/transport.c:297

read to 0xffffffff85a7f190 of 8 bytes by task 10 on cpu 0:
 rcu_gp_fqs_check_wake kernel/rcu/tree.c:1556 [inline]
 rcu_gp_fqs_check_wake+0x93/0xd0 kernel/rcu/tree.c:1546
 rcu_gp_fqs_loop+0x36c/0x580 kernel/rcu/tree.c:1611
 rcu_gp_kthread+0x143/0x220 kernel/rcu/tree.c:1768
 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: 0 PID: 10 Comm: rcu_preempt Not tainted 5.3.0+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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