KCSAN: data-race in tick_nohz_stop_tick / tick_sched

KCSAN: data-race in tick_nohz_stop_tick / tick_sched_timer (3)
Status: moderation: reported on 2020/12/07 11:44
Reported-by: syzbot+ae4c889bc7d1304cc450@syzkaller.appspotmail.com
First crash: 83d, last: 32d

similar bugs (2):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in tick_nohz_stop_tick / tick_sched_timer				2	169d	200d	0/17	auto-closed as invalid on 2020/09/12 13:18
upstream	KCSAN: data-race in tick_nohz_stop_tick / tick_sched_timer (2)				1	120d	120d	0/17	auto-closed as invalid on 2020/11/01 03:13

Sample crash report:

==================================================================
BUG: KCSAN: data-race in tick_nohz_stop_tick / tick_sched_timer

write to 0xffffffff86fc4120 of 4 bytes by task 0 on cpu 1:
 tick_nohz_stop_tick+0x99/0x410 kernel/time/tick-sched.c:837
 __tick_nohz_idle_stop_tick kernel/time/tick-sched.c:1029 [inline]
 tick_nohz_idle_stop_tick+0x148/0x2e0 kernel/time/tick-sched.c:1050
 cpuidle_idle_call kernel/sched/idle.c:235 [inline]
 do_idle+0x176/0x230 kernel/sched/idle.c:299
 cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:396
 secondary_startup_64_no_verify+0xb0/0xbb

read to 0xffffffff86fc4120 of 4 bytes by interrupt on cpu 0:
 tick_sched_do_timer kernel/time/tick-sched.c:187 [inline]
 tick_sched_timer+0x35/0x200 kernel/time/tick-sched.c:1369
 __run_hrtimer+0x133/0x420 kernel/time/hrtimer.c:1519
 __hrtimer_run_queues kernel/time/hrtimer.c:1583 [inline]
 hrtimer_interrupt+0x36e/0xa10 kernel/time/hrtimer.c:1645
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline]
 __sysvec_apic_timer_interrupt+0x6f/0x200 arch/x86/kernel/apic/apic.c:1102
 asm_call_irq_on_stack+0xf/0x20
 __run_sysvec_on_irqstack arch/x86/include/asm/irq_stack.h:37 [inline]
 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:89 [inline]
 sysvec_apic_timer_interrupt+0x52/0x90 arch/x86/kernel/apic/apic.c:1096
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628
 native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline]
 arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline]
 acpi_safe_halt drivers/acpi/processor_idle.c:110 [inline]
 acpi_idle_do_entry drivers/acpi/processor_idle.c:516 [inline]
 acpi_idle_enter+0x25b/0x2e0 drivers/acpi/processor_idle.c:647
 cpuidle_enter_state+0x2bd/0x750 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+0x193/0x230 kernel/sched/idle.c:299
 cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:396
 rest_init+0xd7/0xe0 init/main.c:720
 arch_call_rest_init+0xa/0xb
 start_kernel+0x59b/0x620 init/main.c:1061
 secondary_startup_64_no_verify+0xb0/0xbb

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.10.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (6):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Maintainers
ci2-upstream-kcsan-gce	2020/12/24 04:29	upstream	58cf05f5	c2c1d1dd	.config	log	report	info	fweisbec@gmail.com, linux-kernel@vger.kernel.org, mingo@kernel.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/12/07 09:30	upstream	0477e928	f80ce148	.config	log	report	info	fweisbec@gmail.com, linux-kernel@vger.kernel.org, mingo@kernel.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/12/02 17:23	upstream	509a1542	eff43e99	.config	log	report	info	fweisbec@gmail.com, linux-kernel@vger.kernel.org, mingo@kernel.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/11/16 05:12	upstream	0062442e	1bf9a662	.config	log	report	info	fweisbec@gmail.com, linux-kernel@vger.kernel.org, mingo@kernel.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/11/05 22:22	upstream	521b619a	cba33199	.config	log	report	info	fweisbec@gmail.com, linux-kernel@vger.kernel.org, mingo@kernel.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/11/02 21:16	upstream	495023e4	7f344fa6	.config	log	report	info	fweisbec@gmail.com, linux-kernel@vger.kernel.org, mingo@kernel.org, tglx@linutronix.de