[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.221' (ECDSA) to the list of known hosts. 2020/06/17 23:42:01 fuzzer started 2020/06/17 23:42:01 dialing manager at 10.128.0.105:41225 2020/06/17 23:42:04 syscalls: 3089 2020/06/17 23:42:04 code coverage: enabled 2020/06/17 23:42:04 comparison tracing: enabled 2020/06/17 23:42:04 extra coverage: enabled 2020/06/17 23:42:04 setuid sandbox: enabled 2020/06/17 23:42:04 namespace sandbox: enabled 2020/06/17 23:42:04 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/17 23:42:04 fault injection: enabled 2020/06/17 23:42:04 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/17 23:42:04 net packet injection: enabled 2020/06/17 23:42:04 net device setup: enabled 2020/06/17 23:42:04 concurrency sanitizer: enabled 2020/06/17 23:42:04 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/17 23:42:04 USB emulation: enabled syzkaller login: [ 54.897970][ T8913] KCSAN: could not find function: '_find_next_bit' 2020/06/17 23:42:05 suppressing KCSAN reports in functions: 'pcpu_alloc' 'blk_mq_get_request' 'fat12_ent_put' 'tick_nohz_next_event' 'futex_wait_queue_me' 'generic_file_read_iter' 'ep_poll' '_find_next_bit' 'find_get_pages_range_tag' '__delete_from_page_cache' 'generic_write_end' '__ext4_new_inode' 'run_timer_softirq' [ 70.531842][ T0] ================================================================== [ 70.539987][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_idle_stop_tick [ 70.548904][ T0] [ 70.551228][ T0] write to 0xffffffff8764e210 of 4 bytes by task 0 on cpu 1: [ 70.558585][ T0] tick_nohz_idle_stop_tick+0x52c/0x680 [ 70.564105][ T0] do_idle+0x1ad/0x290 [ 70.568147][ T0] cpu_startup_entry+0x14/0x20 [ 70.572902][ T0] start_secondary+0x169/0x1b0 [ 70.577660][ T0] secondary_startup_64+0xa4/0xb0 [ 70.582665][ T0] [ 70.584981][ T0] read to 0xffffffff8764e210 of 4 bytes by task 0 on cpu 0: [ 70.592342][ T0] tick_nohz_idle_stop_tick+0x191/0x680 [ 70.597861][ T0] do_idle+0x1ad/0x290 [ 70.601920][ T0] cpu_startup_entry+0x14/0x20 [ 70.606672][ T0] rest_init+0xe4/0xeb [ 70.610720][ T0] arch_call_rest_init+0x13/0x2b [ 70.615629][ T0] start_kernel+0x7fe/0x823 [ 70.620106][ T0] secondary_startup_64+0xa4/0xb0 [ 70.625107][ T0] [ 70.627414][ T0] Reported by Kernel Concurrency Sanitizer on: [ 70.633549][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0 [ 70.641410][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 70.651439][ T0] ================================================================== [ 70.659486][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 70.666073][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0 [ 70.673947][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 70.683973][ T0] Call Trace: [ 70.687242][ T0] dump_stack+0x11d/0x187 [ 70.691548][ T0] panic+0x210/0x640 [ 70.695425][ T0] ? vprintk_func+0x89/0x13a [ 70.699992][ T0] kcsan_report.cold+0xc/0x1a [ 70.704747][ T0] kcsan_setup_watchpoint+0x3fb/0x440 [ 70.710098][ T0] tick_nohz_idle_stop_tick+0x191/0x680 [ 70.715624][ T0] do_idle+0x1ad/0x290 [ 70.719667][ T0] ? debug_smp_processor_id+0x3f/0x129 [ 70.725117][ T0] cpu_startup_entry+0x14/0x20 [ 70.729869][ T0] rest_init+0xe4/0xeb [ 70.733928][ T0] ? trace_init_perf_perm_irq_work_exit+0xe/0xe [ 70.740149][ T0] arch_call_rest_init+0x13/0x2b [ 70.745070][ T0] start_kernel+0x7fe/0x823 [ 70.749567][ T0] secondary_startup_64+0xa4/0xb0 [ 70.756091][ T0] Kernel Offset: disabled [ 70.760407][ T0] Rebooting in 86400 seconds..