[ 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 '10.128.0.185' (ECDSA) to the list of known hosts. 2020/06/12 17:39:32 fuzzer started 2020/06/12 17:39:33 dialing manager at 10.128.0.105:35517 2020/06/12 17:39:48 syscalls: 3085 2020/06/12 17:39:48 code coverage: enabled 2020/06/12 17:39:48 comparison tracing: enabled 2020/06/12 17:39:48 extra coverage: enabled 2020/06/12 17:39:48 setuid sandbox: enabled 2020/06/12 17:39:48 namespace sandbox: enabled 2020/06/12 17:39:48 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/12 17:39:48 fault injection: enabled 2020/06/12 17:39:48 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/12 17:39:48 net packet injection: enabled 2020/06/12 17:39:48 net device setup: enabled 2020/06/12 17:39:48 concurrency sanitizer: enabled 2020/06/12 17:39:48 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/12 17:39:48 USB emulation: enabled syzkaller login: [ 64.387300][ T8918] KCSAN: could not find function: '_find_next_bit' 2020/06/12 17:39:50 adding functions to KCSAN blacklist: 'mod_timer' 'do_signal_stop' 'echo_char' 'futex_wait_queue_me' 'find_get_pages_range_tag' 'file_update_time' 'atime_needs_update' 'ext4_free_inodes_count' 'xas_clear_mark' '_find_next_bit' 'do_exit' '__mark_inode_dirty' '__send_signal' 'run_timer_softirq' 'copy_process' 'alloc_pid' '__ext4_new_inode' 'ep_poll' 'generic_write_end' 'tick_sched_do_timer' 'do_nanosleep' 'pcpu_alloc' 'generic_fillattr' [ 165.533307][ T0] ================================================================== [ 165.541445][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_next_event [ 165.549996][ T0] [ 165.552301][ T0] write to 0xffffffff8764e210 of 4 bytes by task 0 on cpu 1: [ 165.559650][ T0] tick_nohz_idle_stop_tick+0x52c/0x680 [ 165.565206][ T0] do_idle+0x1ad/0x290 [ 165.569251][ T0] cpu_startup_entry+0x14/0x20 [ 165.573991][ T0] start_secondary+0x169/0x1b0 [ 165.578731][ T0] secondary_startup_64+0xa4/0xb0 [ 165.583717][ T0] [ 165.586022][ T0] read to 0xffffffff8764e210 of 4 bytes by task 0 on cpu 0: [ 165.593277][ T0] tick_nohz_next_event+0x181/0x340 [ 165.598450][ T0] tick_nohz_idle_stop_tick+0x3b9/0x680 [ 165.603967][ T0] do_idle+0x1ad/0x290 [ 165.608107][ T0] cpu_startup_entry+0x14/0x20 [ 165.612843][ T0] rest_init+0xe4/0xeb [ 165.616886][ T0] arch_call_rest_init+0x13/0x2b [ 165.621800][ T0] start_kernel+0x7fe/0x823 [ 165.626277][ T0] secondary_startup_64+0xa4/0xb0 [ 165.631264][ T0] [ 165.633563][ T0] Reported by Kernel Concurrency Sanitizer on: [ 165.639697][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0 [ 165.647556][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 165.657601][ T0] ================================================================== [ 165.665657][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 165.672219][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0 [ 165.680097][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 165.690139][ T0] Call Trace: [ 165.693422][ T0] dump_stack+0x11d/0x187 [ 165.697741][ T0] panic+0x210/0x640 [ 165.701621][ T0] ? vprintk_func+0x89/0x13a [ 165.706186][ T0] kcsan_report.cold+0xc/0x1a [ 165.710858][ T0] kcsan_setup_watchpoint+0x3fb/0x440 [ 165.716209][ T0] tick_nohz_next_event+0x181/0x340 [ 165.721387][ T0] tick_nohz_idle_stop_tick+0x3b9/0x680 [ 165.726920][ T0] ? rcu_dynticks_eqs_exit+0x2c/0x60 [ 165.732199][ T0] ? debug_smp_processor_id+0x3f/0x129 [ 165.737644][ T0] do_idle+0x1ad/0x290 [ 165.741701][ T0] ? debug_smp_processor_id+0x3a/0x129 [ 165.747137][ T0] cpu_startup_entry+0x14/0x20 [ 165.751878][ T0] rest_init+0xe4/0xeb [ 165.755943][ T0] ? trace_init_perf_perm_irq_work_exit+0xe/0xe [ 165.762157][ T0] arch_call_rest_init+0x13/0x2b [ 165.767080][ T0] start_kernel+0x7fe/0x823 [ 165.771576][ T0] secondary_startup_64+0xa4/0xb0 [ 165.778047][ T0] Kernel Offset: disabled [ 165.782376][ T0] Rebooting in 86400 seconds..