==================================================================
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:2381
 tick_nohz_restart_sched_tick+0x22/0x110 kernel/time/tick-sched.c:1095
 tick_nohz_idle_update_tick kernel/time/tick-sched.c:1426 [inline]
 tick_nohz_idle_exit+0xfe/0x1d0 kernel/time/tick-sched.c:1469
 do_idle+0x1ee/0x230 kernel/sched/idle.c:339
 cpu_startup_entry+0x25/0x30 kernel/sched/idle.c:424
 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 kernel/softirq.c:637 [inline]
 irq_exit_rcu+0x3e/0x90 kernel/softirq.c:649
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1037 [inline]
 sysvec_apic_timer_interrupt+0x73/0x80 arch/x86/kernel/apic/apic.c:1037
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
 pte_pfn arch/x86/include/asm/pgtable.h:267 [inline]
 folio_pte_batch mm/internal.h:201 [inline]
 madvise_folio_pte_batch mm/madvise.c:332 [inline]
 madvise_cold_or_pageout_pte_range+0x54d/0xf30 mm/madvise.c:473
 walk_pmd_range mm/pagewalk.c:106 [inline]
 walk_pud_range mm/pagewalk.c:178 [inline]
 walk_p4d_range mm/pagewalk.c:211 [inline]
 walk_pgd_range+0x7ed/0xec0 mm/pagewalk.c:246
 __walk_page_range+0xc5/0x330 mm/pagewalk.c:348
 walk_page_range+0x395/0x4e0 mm/pagewalk.c:474
 madvise_pageout_page_range mm/madvise.c:609 [inline]
 madvise_pageout mm/madvise.c:636 [inline]
 madvise_vma_behavior mm/madvise.c:1045 [inline]
 madvise_walk_vmas mm/madvise.c:1274 [inline]
 do_madvise+0x1a7a/0x2660 mm/madvise.c:1461
 __do_sys_madvise mm/madvise.c:1477 [inline]
 __se_sys_madvise mm/madvise.c:1475 [inline]
 __x64_sys_madvise+0x61/0x70 mm/madvise.c:1475
 x64_sys_call+0x2320/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:29
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00 -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 22159 Comm: syz.3.5921 Not tainted 6.12.0-rc2-syzkaller-00291-g09f6b0c8904b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
==================================================================