[ 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. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.232' (ECDSA) to the list of known hosts. 2020/06/05 01:46:53 fuzzer started 2020/06/05 01:46:53 dialing manager at 10.128.0.105:41401 2020/06/05 01:46:53 syscalls: 3055 2020/06/05 01:46:53 code coverage: enabled 2020/06/05 01:46:53 comparison tracing: enabled 2020/06/05 01:46:53 extra coverage: enabled 2020/06/05 01:46:53 setuid sandbox: enabled 2020/06/05 01:46:53 namespace sandbox: enabled 2020/06/05 01:46:53 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/05 01:46:53 fault injection: enabled 2020/06/05 01:46:53 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/05 01:46:53 net packet injection: enabled 2020/06/05 01:46:53 net device setup: enabled 2020/06/05 01:46:53 concurrency sanitizer: enabled 2020/06/05 01:46:53 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/05 01:46:53 USB emulation: enabled 2020/06/05 01:46:55 adding functions to KCSAN blacklist: 'blk_mq_sched_dispatch_requests' 'generic_fillattr' 'ep_poll' 'xas_clear_mark' 'run_timer_softirq' '__mpage_writepage' '__ext4_new_inode' 'page_counter_charge' 'do_signal_stop' 'futex_wait_queue_me' 'do_nanosleep' 'mod_timer' 'generic_write_end' 'find_get_pages_range_tag' 'echo_char' syzkaller login: [ 90.454695][ T0] ================================================================== [ 90.462864][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_idle_stop_tick [ 90.471903][ T0] [ 90.474291][ T0] write to 0xffffffff8764e210 of 4 bytes by task 0 on cpu 1: [ 90.481659][ T0] tick_nohz_idle_stop_tick+0x52c/0x680 [ 90.487205][ T0] do_idle+0x1ad/0x290 [ 90.491293][ T0] cpu_startup_entry+0x14/0x20 [ 90.496048][ T0] start_secondary+0x169/0x1b0 [ 90.500816][ T0] secondary_startup_64+0xa4/0xb0 [ 90.505824][ T0] [ 90.508144][ T0] read to 0xffffffff8764e210 of 4 bytes by task 0 on cpu 0: [ 90.515440][ T0] tick_nohz_idle_stop_tick+0x191/0x680 [ 90.520978][ T0] do_idle+0x1ad/0x290 [ 90.525046][ T0] cpu_startup_entry+0x14/0x20 [ 90.529806][ T0] rest_init+0xe4/0xeb [ 90.533860][ T0] arch_call_rest_init+0x13/0x2b [ 90.538782][ T0] start_kernel+0x7fe/0x823 [ 90.543371][ T0] secondary_startup_64+0xa4/0xb0 [ 90.548409][ T0] [ 90.550823][ T0] Reported by Kernel Concurrency Sanitizer on: [ 90.556979][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0 [ 90.564855][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 90.574893][ T0] ================================================================== [ 90.583549][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 90.590115][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0 [ 90.597990][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 90.608033][ T0] Call Trace: [ 90.611314][ T0] dump_stack+0x11d/0x187 [ 90.615641][ T0] panic+0x210/0x640 [ 90.619538][ T0] ? vprintk_func+0x89/0x13a [ 90.624127][ T0] kcsan_report.cold+0xc/0x1a [ 90.628845][ T0] kcsan_setup_watchpoint+0x3fb/0x440 [ 90.634223][ T0] tick_nohz_idle_stop_tick+0x191/0x680 [ 90.639776][ T0] do_idle+0x1ad/0x290 [ 90.643938][ T0] ? debug_smp_processor_id+0x3a/0x129 [ 90.649413][ T0] cpu_startup_entry+0x14/0x20 [ 90.654179][ T0] rest_init+0xe4/0xeb [ 90.658267][ T0] ? trace_init_perf_perm_irq_work_exit+0xe/0xe [ 90.664511][ T0] arch_call_rest_init+0x13/0x2b [ 90.669453][ T0] start_kernel+0x7fe/0x823 [ 90.674069][ T0] secondary_startup_64+0xa4/0xb0 [ 90.680380][ T0] Kernel Offset: disabled [ 90.684707][ T0] Rebooting in 86400 seconds..