GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog ================================================================== BUG: KCSAN: data-race in timer_clear_idle / trigger_dyntick_cpu.isra.0 write to 0xffff88812c11dca4 of 1 bytes by task 0 on cpu 1: timer_clear_idle+0x3d/0x50 kernel/time/timer.c:1676 tick_nohz_restart_sched_tick kernel/time/tick-sched.c:860 [inline] __tick_nohz_idle_restart_tick+0x32/0x1a0 kernel/time/tick-sched.c:1161 tick_nohz_idle_exit+0x19c/0x1d0 kernel/time/tick-sched.c:1202 do_idle+0xac/0x290 kernel/sched/idle.c:282 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:361 start_secondary+0x169/0x1b0 arch/x86/kernel/smpboot.c:268 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:242 read to 0xffff88812c11dca4 of 1 bytes by interrupt on cpu 0: trigger_dyntick_cpu.isra.0+0x6d/0xf0 kernel/time/timer.c:577 internal_add_timer kernel/time/timer.c:596 [inline] add_timer_on+0x192/0x2c0 kernel/time/timer.c:1175 clocksource_watchdog+0x699/0x7c0 kernel/time/clocksource.c:303 call_timer_fn+0x58/0x2e0 kernel/time/timer.c:1405 expire_timers kernel/time/timer.c:1450 [inline] __run_timers kernel/time/timer.c:1774 [inline] __run_timers kernel/time/timer.c:1741 [inline] run_timer_softirq+0xb14/0xbd0 kernel/time/timer.c:1787 __do_softirq+0x118/0x34a kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0xb5/0xd0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:546 [inline] smp_apic_timer_interrupt+0xe2/0x270 arch/x86/kernel/apic/apic.c:1140 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60 arch_safe_halt arch/x86/include/asm/paravirt.h:144 [inline] default_idle+0x21/0x170 arch/x86/kernel/process.c:697 cpuidle_idle_call kernel/sched/idle.c:154 [inline] do_idle+0x1b7/0x290 kernel/sched/idle.c:269 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:361 rest_init+0xe4/0xeb init/main.c:667 arch_call_rest_init+0x13/0x2b start_kernel+0x7fe/0x823 init/main.c:1005 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:242 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================