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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 20086 on cpu 1:
 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_irq+0x57/0x90 kernel/sched/core.c:4328
 restore_regs_and_return_to_kernel+0x0/0x25
 __sanitizer_cov_trace_const_cmp1+0x15/0x20 kernel/kcov.c:175
 sctp_v4_get_dst+0x389/0x7e0 net/sctp/protocol.c:454
 sctp_transport_route+0xb2/0x1e0 net/sctp/transport.c:297
 sctp_assoc_add_peer+0x322/0x7f0 net/sctp/associola.c:652
 sctp_process_param net/sctp/sm_make_chunk.c:2524 [inline]
 sctp_process_init+0xc10/0x1620 net/sctp/sm_make_chunk.c:2345
 sctp_cmd_process_init net/sctp/sm_sideeffect.c:667 [inline]
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1374 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1184 [inline]
 sctp_do_sm+0x1683/0x2ef0 net/sctp/sm_sideeffect.c:1155
 sctp_assoc_bh_rcv+0x291/0x3e0 net/sctp/associola.c:1048
 sctp_inq_push+0x107/0x1a0 net/sctp/inqueue.c:80
 sctp_backlog_rcv+0x112/0x7a0 net/sctp/input.c:344
 sk_backlog_rcv include/net/sock.h:950 [inline]
 __release_sock+0x135/0x1e0 net/core/sock.c:2439
 release_sock+0x61/0x160 net/core/sock.c:2955
 sctp_connect net/sctp/socket.c:4843 [inline]
 sctp_inet_connect+0xe7/0x120 net/sctp/socket.c:4856
 __sys_connect+0x1e9/0x250 net/socket.c:1828
 __do_sys_connect net/socket.c:1839 [inline]
 __se_sys_connect net/socket.c:1836 [inline]
 __x64_sys_connect+0x4c/0x60 net/socket.c:1836
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffffffff85a7d1d0 of 8 bytes by task 10 on cpu 0:
 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: 0 PID: 10 Comm: rcu_preempt Not tainted 5.4.0-rc7+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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