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BUG: KCSAN: data-race in add_timer / run_timer_softirq

read to 0xffff88812bf1b6c8 of 8 bytes by task 8974 on cpu 0:
 __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
 mod_delayed_work_on+0x8b/0x100 kernel/workqueue.c:1712
 mod_delayed_work include/linux/workqueue.h:524 [inline]
 addrconf_mod_dad_work+0x51/0xa0 net/ipv6/addrconf.c:325
 addrconf_dad_kick+0x142/0x1f0 net/ipv6/addrconf.c:3929
 addrconf_dad_run+0x93/0x150 net/ipv6/addrconf.c:4230
 addrconf_notify+0xf68/0x1480 net/ipv6/addrconf.c:3601
 notifier_call_chain+0xd7/0x160 kernel/notifier.c:95
 __raw_notifier_call_chain kernel/notifier.c:396 [inline]
 raw_notifier_call_chain+0x37/0x50 kernel/notifier.c:403
 call_netdevice_notifiers_info+0x48/0xc0 net/core/dev.c:1668
 netdev_state_change net/core/dev.c:1271 [inline]
 netdev_state_change+0xb2/0xd0 net/core/dev.c:1264
 linkwatch_do_dev+0xd8/0xf0 net/core/link_watch.c:159
 __linkwatch_run_queue+0x1a9/0x510 net/core/link_watch.c:204
 linkwatch_event+0x54/0x70 net/core/link_watch.c:243
 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 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
 mpihelp_addmul_1+0x12b/0x180 lib/mpi/generic_mpih-mul2.c:43
 mpih_sqr_n_basecase+0x19c/0x270 lib/mpi/mpih-mul.c:237
 mpih_sqr_n+0x4d4/0x660 lib/mpi/mpih-mul.c:304
 mpi_powm+0xa1f/0x13a0 lib/mpi/mpi-pow.c:200
 _compute_val crypto/dh.c:39 [inline]
 dh_compute_value+0x236/0x340 crypto/dh.c:178
 crypto_kpp_generate_public_key include/crypto/kpp.h:315 [inline]
 __keyctl_dh_compute+0x719/0xeb0 security/keys/dh.c:367
 keyctl_dh_compute+0x7d/0xc1 security/keys/dh.c:422
 __do_sys_keyctl security/keys/keyctl.c:1818 [inline]
 __se_sys_keyctl security/keys/keyctl.c:1714 [inline]
 __x64_sys_keyctl+0xf9/0x3e0 security/keys/keyctl.c:1714
 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: 13721 Comm: syz-executor.3 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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