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BUG: KCSAN: data-race in __mod_timer / expire_timers

write to 0xffff88813bd1b908 of 8 bytes by interrupt on cpu 1:
 expire_timers+0x11e/0x260 kernel/time/timer.c:1477
 __run_timers+0x358/0x3f0 kernel/time/timer.c:1745
 run_timer_softirq+0x19/0x30 kernel/time/timer.c:1758
 __do_softirq+0x13c/0x2c3 kernel/softirq.c:345
 invoke_softirq kernel/softirq.c:221 [inline]
 __irq_exit_rcu+0xb4/0xc0 kernel/softirq.c:422
 sysvec_apic_timer_interrupt+0x6e/0x80 arch/x86/kernel/apic/apic.c:1100
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
 tomoyo_domain_quota_is_ok+0x197/0x2f0 security/tomoyo/util.c:1093
 tomoyo_supervisor+0x1f4/0xb40 security/tomoyo/common.c:2089
 tomoyo_audit_path_log security/tomoyo/file.c:168 [inline]
 tomoyo_path_permission security/tomoyo/file.c:587 [inline]
 tomoyo_path_perm+0x261/0x330 security/tomoyo/file.c:838
 tomoyo_inode_getattr+0x18/0x20 security/tomoyo/tomoyo.c:123
 security_inode_getattr+0x7f/0xd0 security/security.c:1288
 vfs_getattr fs/stat.c:131 [inline]
 vfs_fstat fs/stat.c:156 [inline]
 __do_sys_newfstat fs/stat.c:396 [inline]
 __se_sys_newfstat+0x58/0x2c0 fs/stat.c:393
 __x64_sys_newfstat+0x2d/0x40 fs/stat.c:393
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88813bd1b908 of 8 bytes by task 41 on cpu 0:
 __mod_timer+0x44e/0xc10 kernel/time/timer.c:1035
 add_timer+0x38/0x50 kernel/time/timer.c:1142
 __queue_delayed_work+0xec/0x150 kernel/workqueue.c:1655
 queue_delayed_work_on+0x6f/0xd0 kernel/workqueue.c:1680
 queue_delayed_work include/linux/workqueue.h:522 [inline]
 wb_wakeup_delayed+0x95/0xb0 mm/backing-dev.c:270
 wb_workfn+0x2ad/0x430 fs/fs-writeback.c:2108
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275
 worker_thread+0x616/0xa70 kernel/workqueue.c:2421
 kthread+0x20b/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 41 Comm: kworker/u4:2 Not tainted 5.12.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: writeback wb_workfn (flush-8:0)
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