sd 0:0:1:0: tag#7741 CDB[00]: e5 f4 32 73 2f 4e 09 6d 26 e2 c7 35 d1 35 12 1c sd 0:0:1:0: tag#7741 CDB[10]: 92 1b da 40 b8 58 5b a8 d4 7d 34 f3 90 4c f1 2d sd 0:0:1:0: tag#7741 CDB[20]: ba ================================================================== BUG: KCSAN: data-race in internal_add_timer / update_process_times write to 0xffff888237c1b858 of 8 bytes by interrupt on cpu 1: enqueue_timer kernel/time/timer.c:598 [inline] internal_add_timer+0x14f/0x2b0 kernel/time/timer.c:611 add_timer_on+0x247/0x280 kernel/time/timer.c:1182 clocksource_watchdog+0xa96/0xac0 kernel/time/clocksource.c:478 call_timer_fn+0x2e/0x240 kernel/time/timer.c:1421 expire_timers+0x116/0x240 kernel/time/timer.c:1466 __run_timers+0x368/0x410 kernel/time/timer.c:1734 run_timer_softirq+0x2e/0x60 kernel/time/timer.c:1747 __do_softirq+0x158/0x2de kernel/softirq.c:558 __irq_exit_rcu kernel/softirq.c:636 [inline] irq_exit_rcu+0x37/0x70 kernel/softirq.c:648 sysvec_apic_timer_interrupt+0x8d/0xb0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 is_atomic kernel/kcsan/core.c:238 [inline] should_watch kernel/kcsan/core.c:266 [inline] check_access kernel/kcsan/core.c:633 [inline] __tsan_read8+0x11a/0x180 kernel/kcsan/core.c:855 __list_del_entry include/linux/list.h:135 [inline] list_del_init include/linux/list.h:204 [inline] ep_send_events fs/eventpoll.c:1678 [inline] ep_poll fs/eventpoll.c:1799 [inline] do_epoll_wait+0x600/0xf40 fs/eventpoll.c:2227 __do_sys_epoll_wait fs/eventpoll.c:2239 [inline] __se_sys_epoll_wait fs/eventpoll.c:2234 [inline] __x64_sys_epoll_wait+0x119/0x140 fs/eventpoll.c:2234 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888237c1b858 of 8 bytes by interrupt on cpu 0: run_local_timers kernel/time/timer.c:1761 [inline] update_process_times+0x9c/0x160 kernel/time/timer.c:1784 tick_sched_handle kernel/time/tick-sched.c:226 [inline] tick_sched_timer+0x19d/0x220 kernel/time/tick-sched.c:1421 __run_hrtimer+0x163/0x460 kernel/time/hrtimer.c:1685 __hrtimer_run_queues kernel/time/hrtimer.c:1749 [inline] hrtimer_interrupt+0x37e/0xac0 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline] __sysvec_apic_timer_interrupt+0xa3/0x240 arch/x86/kernel/apic/apic.c:1103 sysvec_apic_timer_interrupt+0x88/0xb0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] acpi_safe_halt drivers/acpi/processor_idle.c:109 [inline] acpi_idle_do_entry drivers/acpi/processor_idle.c:553 [inline] acpi_idle_enter+0x282/0x300 drivers/acpi/processor_idle.c:688 cpuidle_enter_state+0x2b4/0x7d0 drivers/cpuidle/cpuidle.c:237 cpuidle_enter+0x3c/0x60 drivers/cpuidle/cpuidle.c:351 call_cpuidle kernel/sched/idle.c:158 [inline] cpuidle_idle_call kernel/sched/idle.c:239 [inline] do_idle+0x1b2/0x250 kernel/sched/idle.c:306 cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:403 rest_init+0xfa/0x100 init/main.c:725 arch_call_rest_init+0xa/0xb start_kernel+0x5e4/0x669 init/main.c:1133 secondary_startup_64_no_verify+0xb1/0xbb value changed: 0x00000001000087c0 -> 0x0000000100008053 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 5.15.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================