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BUG: KCSAN: data-race in __mod_timer / expire_timers

write to 0xffff88813bc1b908 of 8 bytes by interrupt on cpu 0:
 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
 arch_atomic_inc arch/x86/include/asm/atomic.h:95 [inline]
 atomic_inc include/asm-generic/atomic-instrumented.h:241 [inline]
 page_ref_inc include/linux/page_ref.h:116 [inline]
 get_page include/linux/mm.h:1186 [inline]
 copy_present_pte mm/memory.c:875 [inline]
 copy_pte_range+0x67e/0x1ba0 mm/memory.c:984
 copy_pmd_range mm/memory.c:1064 [inline]
 copy_pud_range mm/memory.c:1101 [inline]
 copy_p4d_range mm/memory.c:1125 [inline]
 copy_page_range+0x85e/0xb70 mm/memory.c:1198
 dup_mmap+0x77b/0xaa0 kernel/fork.c:594
 dup_mm+0x7c/0x210 kernel/fork.c:1368
 copy_mm kernel/fork.c:1424 [inline]
 copy_process+0x12c3/0x2e50 kernel/fork.c:2107
 kernel_clone+0x14b/0x690 kernel/fork.c:2501
 __do_sys_clone kernel/fork.c:2618 [inline]
 __se_sys_clone kernel/fork.c:2602 [inline]
 __x64_sys_clone+0xb4/0xe0 kernel/fork.c:2602
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88813bc1b908 of 8 bytes by task 19 on cpu 1:
 __mod_timer+0x44e/0xc10 kernel/time/timer.c:1035
 mod_timer+0x1b/0x20 kernel/time/timer.c:1106
 addrconf_mod_rs_timer net/ipv6/addrconf.c:321 [inline]
 addrconf_dad_completed+0x792/0x870 net/ipv6/addrconf.c:4203
 addrconf_dad_work+0x8dd/0x1160 net/ipv6/addrconf.c:3962
 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: 1 PID: 19 Comm: kworker/1:0 Not tainted 5.12.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: ipv6_addrconf addrconf_dad_work
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Bluetooth: hci2: command 0x041b tx timeout