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BUG: KCSAN: data-race in __tmigr_cpu_activate / tmigr_handle_remote

write to 0xffff888237d205dc of 1 bytes by task 0 on cpu 1:
 __tmigr_cpu_activate+0x55/0x200 kernel/time/timer_migration.c:676
 tmigr_cpu_activate+0x8a/0xc0 kernel/time/timer_migration.c:699
 timer_clear_idle+0x28/0x100 kernel/time/timer.c:2380
 tick_nohz_restart_sched_tick+0x22/0x110 kernel/time/tick-sched.c:1096
 tick_nohz_idle_update_tick kernel/time/tick-sched.c:1427 [inline]
 tick_nohz_idle_exit+0xfe/0x1d0 kernel/time/tick-sched.c:1470
 do_idle+0x1eb/0x230 kernel/sched/idle.c:338
 cpu_startup_entry+0x25/0x30 kernel/sched/idle.c:423
 start_secondary+0x96/0xa0 arch/x86/kernel/smpboot.c:314
 common_startup_64+0x12c/0x137

read to 0xffff888237d205dc of 1 bytes by interrupt on cpu 0:
 tmigr_next_groupevt kernel/time/timer_migration.c:567 [inline]
 tmigr_next_expired_groupevt kernel/time/timer_migration.c:591 [inline]
 tmigr_handle_remote_up kernel/time/timer_migration.c:1014 [inline]
 __walk_groups kernel/time/timer_migration.c:533 [inline]
 tmigr_handle_remote+0x26e/0x940 kernel/time/timer_migration.c:1080
 run_timer_softirq+0x5f/0x70 kernel/time/timer.c:2453
 handle_softirqs+0xbf/0x280 kernel/softirq.c:554
 __do_softirq kernel/softirq.c:588 [inline]
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu+0x3a/0xc0 kernel/softirq.c:655
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0x73/0x80 arch/x86/kernel/apic/apic.c:1049
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
 arch_atomic64_read arch/x86/include/asm/atomic64_64.h:15 [inline]
 raw_atomic64_read include/linux/atomic/atomic-arch-fallback.h:2583 [inline]
 raw_atomic_long_read include/linux/atomic/atomic-long.h:38 [inline]
 atomic_long_read include/linux/atomic/atomic-instrumented.h:3189 [inline]
 find_watchpoint kernel/kcsan/core.c:131 [inline]
 check_access kernel/kcsan/core.c:737 [inline]
 __tsan_read8+0x2c/0x180 kernel/kcsan/core.c:1025
 kthread_data+0x55/0x70 kernel/kthread.c:244
 wq_worker_running+0x1a/0x130 kernel/workqueue.c:1387
 worker_thread+0x5f4/0x6f0 kernel/workqueue.c:3406
 kthread+0x1d1/0x210 kernel/kthread.c:389
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

value changed: 0x00 -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3396 Comm: kworker/0:3 Not tainted 6.12.0-syzkaller-10296-gaaf20f870da0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue:  0x0 (events)
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