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BUG: KCSAN: data-race in mod_timer / run_timer_softirq

read to 0xffff88812bf1b6c8 of 8 bytes by task 8334 on cpu 0:
 __mod_timer kernel/time/timer.c:1026 [inline]
 mod_timer+0x1ec/0x7a0 kernel/time/timer.c:1100
 sctp_transport_reset_hb_timer+0x11a/0x140 net/sctp/transport.c:197
 sctp_cmd_transport_on net/sctp/sm_sideeffect.c:781 [inline]
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1640 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1184 [inline]
 sctp_do_sm+0x80a/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_setsockopt net/sctp/socket.c:4806 [inline]
 sctp_setsockopt+0x11b/0x4ff0 net/sctp/socket.c:4611
 sock_common_setsockopt+0x67/0x90 net/core/sock.c:3151
 __sys_setsockopt+0x1ce/0x370 net/socket.c:2084
 __do_sys_setsockopt net/socket.c:2100 [inline]
 __se_sys_setsockopt net/socket.c:2097 [inline]
 __x64_sys_setsockopt+0x70/0x90 net/socket.c:2097
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff88812bf1b6c8 of 8 bytes by interrupt on cpu 1:
 expire_timers kernel/time/timer.c:1445 [inline]
 __run_timers kernel/time/timer.c:1773 [inline]
 __run_timers kernel/time/timer.c:1740 [inline]
 run_timer_softirq+0x496/0xcd0 kernel/time/timer.c:1786
 __do_softirq+0x115/0x33f kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0xbb/0xe0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0xe6/0x280 arch/x86/kernel/apic/apic.c:1137
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
 arch_local_irq_enable arch/x86/include/asm/paravirt.h:766 [inline]
 preempt_schedule_irq+0x4d/0x90 kernel/sched/core.c:4327
 restore_regs_and_return_to_kernel+0x0/0x25
 tomoyo_check_acl+0x9d/0x270 security/tomoyo/domain.c:170
 tomoyo_inet_entry security/tomoyo/network.c:483 [inline]
 tomoyo_check_inet_address security/tomoyo/network.c:532 [inline]
 tomoyo_check_inet_address+0x326/0x360 security/tomoyo/network.c:501
 tomoyo_socket_bind_permission+0x16a/0x200 security/tomoyo/network.c:745
 tomoyo_socket_bind+0x2f/0x50 security/tomoyo/tomoyo.c:471
 security_socket_bind+0x6d/0xa0 security/security.c:1993
 __sys_bind+0x18e/0x220 net/socket.c:1643
 __do_sys_bind net/socket.c:1658 [inline]
 __se_sys_bind net/socket.c:1656 [inline]
 __x64_sys_bind+0x4c/0x60 net/socket.c:1656
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8342 Comm: syz-executor.2 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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