[ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ 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 '10.128.0.148' (ECDSA) to the list of known hosts. 2020/06/11 18:17:02 fuzzer started 2020/06/11 18:17:02 dialing manager at 10.128.0.105:39743 2020/06/11 18:17:02 syscalls: 3078 2020/06/11 18:17:02 code coverage: enabled 2020/06/11 18:17:02 comparison tracing: enabled 2020/06/11 18:17:02 extra coverage: enabled 2020/06/11 18:17:02 setuid sandbox: enabled 2020/06/11 18:17:02 namespace sandbox: enabled 2020/06/11 18:17:02 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/11 18:17:02 fault injection: enabled 2020/06/11 18:17:02 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/11 18:17:02 net packet injection: enabled 2020/06/11 18:17:02 net device setup: enabled 2020/06/11 18:17:02 concurrency sanitizer: enabled 2020/06/11 18:17:02 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/11 18:17:02 USB emulation: enabled syzkaller login: [ 50.999942][ T8930] KCSAN: could not find function: '_find_next_bit' 2020/06/11 18:17:05 adding functions to KCSAN blacklist: 'shmem_add_to_page_cache' '_find_next_bit' 'generic_write_end' 'echo_char' '__send_signal' 'tick_nohz_idle_stop_tick' 'ext4_free_inodes_count' 'find_get_pages_range_tag' 'xas_clear_mark' 'pcpu_alloc' 'futex_wait_queue_me' 'file_update_time' '__perf_event_overflow' 'ep_poll' 'do_nanosleep' '__ext4_new_inode' 'blk_mq_sched_dispatch_requests' 'complete_signal' 'wbt_done' 'dput' 'blk_mq_get_request' 'generic_fillattr' 'page_counter_charge' 'do_syslog' 'do_exit' 'mod_timer' 'do_signal_stop' 'copy_process' 'run_timer_softirq' [ 165.701367][ T0] ================================================================== [ 165.709632][ T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_do_timer [ 165.717781][ T0] [ 165.720107][ T0] write to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 1: [ 165.727737][ T0] tick_sched_do_timer+0xb4/0xd0 [ 165.732663][ T0] tick_sched_timer+0x3f/0xd0 [ 165.737348][ T0] __hrtimer_run_queues+0x271/0x600 [ 165.742581][ T0] hrtimer_interrupt+0x226/0x490 [ 165.747503][ T0] smp_apic_timer_interrupt+0xd8/0x270 [ 165.752940][ T0] apic_timer_interrupt+0xf/0x20 [ 165.757866][ T0] native_safe_halt+0xe/0x10 [ 165.762456][ T0] default_idle+0x21/0x170 [ 165.766866][ T0] do_idle+0x1b7/0x290 [ 165.770953][ T0] cpu_startup_entry+0x14/0x20 [ 165.775711][ T0] start_secondary+0x169/0x1b0 [ 165.780497][ T0] secondary_startup_64+0xa4/0xb0 [ 165.785509][ T0] [ 165.787869][ T0] read to 0xffffffff8764e210 of 4 bytes by task 0 on cpu 0: [ 165.795162][ T0] tick_nohz_next_event+0x181/0x340 [ 165.800635][ T0] tick_nohz_idle_stop_tick+0x3b9/0x680 [ 165.806200][ T0] do_idle+0x1ad/0x290 [ 165.810326][ T0] cpu_startup_entry+0x14/0x20 [ 165.815077][ T0] rest_init+0xe4/0xeb [ 165.819131][ T0] arch_call_rest_init+0x13/0x2b [ 165.824051][ T0] start_kernel+0x7fe/0x823 [ 165.828600][ T0] secondary_startup_64+0xa4/0xb0 [ 165.833608][ T0] [ 165.835940][ T0] Reported by Kernel Concurrency Sanitizer on: [ 165.842113][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0 [ 165.850585][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 165.860626][ T0] ================================================================== [ 165.868671][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 165.875239][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0 [ 165.883109][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 165.893160][ T0] Call Trace: [ 165.896434][ T0] dump_stack+0x11d/0x187 [ 165.900814][ T0] panic+0x210/0x640 [ 165.904703][ T0] ? vprintk_func+0x89/0x13a [ 165.909276][ T0] kcsan_report.cold+0xc/0x1a [ 165.913954][ T0] kcsan_setup_watchpoint+0x3fb/0x440 [ 165.919438][ T0] tick_nohz_next_event+0x181/0x340 [ 165.924642][ T0] tick_nohz_idle_stop_tick+0x3b9/0x680 [ 165.930179][ T0] ? rcu_dynticks_eqs_exit+0x2c/0x60 [ 165.935452][ T0] ? debug_smp_processor_id+0x3f/0x129 [ 165.940906][ T0] do_idle+0x1ad/0x290 [ 165.944989][ T0] ? debug_smp_processor_id+0x3a/0x129 [ 165.950440][ T0] cpu_startup_entry+0x14/0x20 [ 165.955200][ T0] rest_init+0xe4/0xeb [ 165.959292][ T0] ? trace_init_perf_perm_irq_work_exit+0xe/0xe [ 165.965534][ T0] arch_call_rest_init+0x13/0x2b [ 165.970588][ T0] start_kernel+0x7fe/0x823 [ 165.975086][ T0] secondary_startup_64+0xa4/0xb0 [ 165.981373][ T0] Kernel Offset: disabled [ 165.986018][ T0] Rebooting in 86400 seconds..