[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.200' (ECDSA) to the list of known hosts. 2020/06/04 13:29:25 fuzzer started 2020/06/04 13:29:25 dialing manager at 10.128.0.105:43989 2020/06/04 13:29:29 syscalls: 3055 2020/06/04 13:29:29 code coverage: enabled 2020/06/04 13:29:29 comparison tracing: enabled 2020/06/04 13:29:29 extra coverage: enabled 2020/06/04 13:29:29 setuid sandbox: enabled 2020/06/04 13:29:29 namespace sandbox: enabled 2020/06/04 13:29:29 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/04 13:29:29 fault injection: enabled 2020/06/04 13:29:29 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/04 13:29:29 net packet injection: enabled 2020/06/04 13:29:29 net device setup: enabled 2020/06/04 13:29:29 concurrency sanitizer: enabled 2020/06/04 13:29:29 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/04 13:29:29 USB emulation: enabled 2020/06/04 13:29:30 adding functions to KCSAN blacklist: '__send_signal' 'ep_poll' '__ext4_new_inode' 'snd_rawmidi_kernel_write1' 'mod_timer' 'do_nanosleep' 'page_counter_charge' 'find_get_pages_range_tag' 'generic_fillattr' 'copy_process' 'generic_write_end' 'complete_signal' syzkaller login: [ 89.756824][ T0] ================================================================== [ 89.765087][ T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_do_timer [ 89.773220][ T0] [ 89.775539][ T0] write to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 0: [ 89.783539][ T0] tick_sched_do_timer+0xb4/0xd0 [ 89.788824][ T0] tick_sched_timer+0x3f/0xd0 [ 89.793478][ T0] __hrtimer_run_queues+0x271/0x600 [ 89.798664][ T0] hrtimer_interrupt+0x226/0x490 [ 89.803722][ T0] smp_apic_timer_interrupt+0xd8/0x270 [ 89.809189][ T0] apic_timer_interrupt+0xf/0x20 [ 89.814120][ T0] _raw_spin_unlock_irq+0x4b/0x80 [ 89.819146][ T0] finish_task_switch+0x7b/0x260 [ 89.824160][ T0] __schedule+0x30f/0x6b0 [ 89.828656][ T0] schedule+0x41/0xe0 [ 89.832637][ T0] schedule_hrtimeout_range_clock+0x1db/0x1f0 [ 89.838699][ T0] schedule_hrtimeout_range+0x30/0x50 [ 89.844067][ T0] ep_poll+0x7c9/0x910 [ 89.848251][ T0] do_epoll_wait+0x15a/0x180 [ 89.852852][ T0] __x64_sys_epoll_pwait+0xc6/0x170 [ 89.858146][ T0] do_syscall_64+0xc7/0x3b0 [ 89.862740][ T0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 89.868610][ T0] [ 89.870959][ T0] read to 0xffffffff8764e210 of 4 bytes by task 0 on cpu 1: [ 89.878229][ T0] tick_nohz_next_event+0x181/0x340 [ 89.883429][ T0] tick_nohz_idle_stop_tick+0x3b9/0x680 [ 89.888962][ T0] do_idle+0x1ad/0x290 [ 89.893017][ T0] cpu_startup_entry+0x14/0x20 [ 89.897778][ T0] start_secondary+0x169/0x1b0 [ 89.902575][ T0] secondary_startup_64+0xa4/0xb0 [ 89.907683][ T0] [ 89.909992][ T0] Reported by Kernel Concurrency Sanitizer on: [ 89.916134][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-rc1-syzkaller #0 [ 89.924471][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 89.934634][ T0] ================================================================== [ 89.942683][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 89.949265][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-rc1-syzkaller #0 [ 89.957169][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 89.967307][ T0] Call Trace: [ 89.970659][ T0] dump_stack+0x11d/0x187 [ 89.975113][ T0] panic+0x210/0x640 [ 89.979001][ T0] ? vprintk_func+0x89/0x13a [ 89.983594][ T0] kcsan_report.cold+0xc/0x1a [ 89.988260][ T0] kcsan_setup_watchpoint+0x3fb/0x440 [ 89.993732][ T0] tick_nohz_next_event+0x181/0x340 [ 90.005098][ T0] tick_nohz_idle_stop_tick+0x3b9/0x680 [ 90.010747][ T0] ? ktime_get+0x1c9/0x210 [ 90.015169][ T0] ? debug_smp_processor_id+0x3f/0x129 [ 90.020733][ T0] do_idle+0x1ad/0x290 [ 90.024818][ T0] ? debug_smp_processor_id+0x3a/0x129 [ 90.030265][ T0] cpu_startup_entry+0x14/0x20 [ 90.035017][ T0] start_secondary+0x169/0x1b0 [ 90.039770][ T0] secondary_startup_64+0xa4/0xb0 [ 90.046251][ T0] Kernel Offset: disabled [ 90.051002][ T0] Rebooting in 86400 seconds..