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BUG: KCSAN: data-race in add_timer / run_timer_softirq

read to 0xffff88812be1b6c8 of 8 bytes by task 21 on cpu 1:
 __mod_timer kernel/time/timer.c:1026 [inline]
 mod_timer kernel/time/timer.c:1100 [inline]
 add_timer+0x16f/0x550 kernel/time/timer.c:1136
 __queue_delayed_work+0x13b/0x1d0 kernel/workqueue.c:1649
 queue_delayed_work_on+0xf3/0x110 kernel/workqueue.c:1674
 queue_delayed_work include/linux/workqueue.h:509 [inline]
 wb_wakeup_delayed+0xad/0xb0 mm/backing-dev.c:274
 wb_workfn+0x826/0x970 fs/fs-writeback.c:2092
 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

write to 0xffff88812be1b6c8 of 8 bytes by interrupt on cpu 0:
 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+0xba3/0xd20 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:4318
 restore_regs_and_return_to_kernel+0x0/0x25
 tomoyo_domain_quota_is_ok+0xee/0x2b0 security/tomoyo/util.c:1035
 tomoyo_supervisor+0x22b/0xd20 security/tomoyo/common.c:2087
 tomoyo_audit_path_number_log security/tomoyo/file.c:235 [inline]
 tomoyo_path_number_perm+0x323/0x3c0 security/tomoyo/file.c:734
 tomoyo_file_ioctl+0x2c/0x40 security/tomoyo/tomoyo.c:335
 security_file_ioctl+0x6d/0xa0 security/security.c:1409
 ksys_ioctl+0x64/0xe0 fs/ioctl.c:711

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 12110 Comm: syz-executor.2 Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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