syzbot

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BUG: KCSAN: data-race in __tmigr_cpu_deactivate / tmigr_handle_remote

write to 0xffff888237c205dc of 1 bytes by task 0 on cpu 0:
 __tmigr_cpu_deactivate+0xa1/0x410 kernel/time/timer_migration.c:1320
 tmigr_cpu_deactivate+0x66/0x180 kernel/time/timer_migration.c:1346
 timer_use_tmigr kernel/time/timer.c:2193 [inline]
 __get_next_timer_interrupt+0x137/0x530 kernel/time/timer.c:2268
 timer_base_try_to_set_idle+0x54/0x60 kernel/time/timer.c:2357
 tick_nohz_stop_tick kernel/time/tick-sched.c:985 [inline]
 tick_nohz_idle_stop_tick+0x15b/0x650 kernel/time/tick-sched.c:1227
 cpuidle_idle_call kernel/sched/idle.c:226 [inline]
 do_idle+0x175/0x230 kernel/sched/idle.c:325
 cpu_startup_entry+0x25/0x30 kernel/sched/idle.c:423
 rest_init+0xef/0xf0 init/main.c:747
 start_kernel+0x586/0x5e0 init/main.c:1102
 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:507
 x86_64_start_kernel+0x9a/0xa0 arch/x86/kernel/head64.c:488
 common_startup_64+0x12c/0x137

read to 0xffff888237c205dc of 1 bytes by interrupt on cpu 1:
 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:561
 __do_softirq kernel/softirq.c:595 [inline]
 invoke_softirq kernel/softirq.c:435 [inline]
 __irq_exit_rcu+0x3a/0xc0 kernel/softirq.c:662
 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
 native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
 arch_safe_halt arch/x86/include/asm/irqflags.h:106 [inline]
 acpi_safe_halt+0x21/0x30 drivers/acpi/processor_idle.c:111
 acpi_idle_do_entry+0x1d/0x30 drivers/acpi/processor_idle.c:568
 acpi_idle_enter+0x96/0xb0 drivers/acpi/processor_idle.c:699
 cpuidle_enter_state+0xc5/0x260 drivers/cpuidle/cpuidle.c:268
 cpuidle_enter+0x40/0x70 drivers/cpuidle/cpuidle.c:389
 call_cpuidle kernel/sched/idle.c:155 [inline]
 cpuidle_idle_call kernel/sched/idle.c:230 [inline]
 do_idle+0x192/0x230 kernel/sched/idle.c:325
 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

value changed: 0x01 -> 0x00

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 6.13.0-rc7-syzkaller-00191-gfda5e3f28400 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
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