================================================================== BUG: KCSAN: data-race in __tmigr_cpu_deactivate / tmigr_handle_remote write to 0xffff888237d205e4 of 1 bytes by task 0 on cpu 1: __tmigr_cpu_deactivate+0x83/0x470 kernel/time/timer_migration.c:1352 tmigr_cpu_deactivate+0x66/0x180 kernel/time/timer_migration.c:1378 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:982 [inline] tick_nohz_idle_stop_tick+0x15b/0x640 kernel/time/tick-sched.c:1218 cpuidle_idle_call kernel/sched/idle.c:232 [inline] do_idle+0x178/0x230 kernel/sched/idle.c:332 cpu_startup_entry+0x25/0x30 kernel/sched/idle.c:430 start_secondary+0x94/0xa0 arch/x86/kernel/smpboot.c:313 common_startup_64+0x12c/0x137 read to 0xffff888237d205e4 of 1 bytes by interrupt on cpu 0: tmigr_next_groupevt kernel/time/timer_migration.c:569 [inline] tmigr_next_expired_groupevt kernel/time/timer_migration.c:593 [inline] tmigr_handle_remote_up kernel/time/timer_migration.c:1023 [inline] __walk_groups kernel/time/timer_migration.c:488 [inline] tmigr_handle_remote+0x26e/0x910 kernel/time/timer_migration.c:1091 run_timer_softirq+0x5f/0x70 kernel/time/timer.c:2452 __do_softirq+0xc8/0x285 kernel/softirq.c:554 invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu kernel/softirq.c:633 [inline] irq_exit_rcu+0x3c/0x90 kernel/softirq.c:645 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x73/0x80 arch/x86/kernel/apic/apic.c:1043 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:86 [inline] acpi_safe_halt+0x21/0x30 drivers/acpi/processor_idle.c:112 acpi_idle_do_entry+0x1d/0x30 drivers/acpi/processor_idle.c:573 acpi_idle_enter+0x96/0xb0 drivers/acpi/processor_idle.c:707 cpuidle_enter_state+0xcf/0x270 drivers/cpuidle/cpuidle.c:267 cpuidle_enter+0x40/0x70 drivers/cpuidle/cpuidle.c:388 call_cpuidle kernel/sched/idle.c:155 [inline] cpuidle_idle_call kernel/sched/idle.c:236 [inline] do_idle+0x195/0x230 kernel/sched/idle.c:332 cpu_startup_entry+0x25/0x30 kernel/sched/idle.c:430 rest_init+0xef/0xf0 init/main.c:737 start_kernel+0x57c/0x5e0 init/main.c:1079 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:507 x86_64_start_kernel+0x94/0xa0 arch/x86/kernel/head64.c:488 common_startup_64+0x12c/0x137 value changed: 0x01 -> 0x00 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.9.0-rc3-syzkaller-00355-g7efd0a74039f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 ================================================================== TCP: request_sock_subflow_v4: Possible SYN flooding on port [::]:20002. Sending cookies.