[ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ 42.810680][ T8830] bash (8830) used greatest stack depth: 10848 bytes left [ 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 '10.128.0.208' (ECDSA) to the list of known hosts. 2020/06/13 05:46:24 fuzzer started 2020/06/13 05:46:24 dialing manager at 10.128.0.105:39701 2020/06/13 05:46:25 syscalls: 3085 2020/06/13 05:46:25 code coverage: enabled 2020/06/13 05:46:25 comparison tracing: enabled 2020/06/13 05:46:25 extra coverage: enabled 2020/06/13 05:46:25 setuid sandbox: enabled 2020/06/13 05:46:25 namespace sandbox: enabled 2020/06/13 05:46:25 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/13 05:46:25 fault injection: enabled 2020/06/13 05:46:25 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/13 05:46:25 net packet injection: enabled 2020/06/13 05:46:25 net device setup: enabled 2020/06/13 05:46:25 concurrency sanitizer: enabled 2020/06/13 05:46:25 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/13 05:46:25 USB emulation: enabled syzkaller login: [ 53.836161][ T8926] KCSAN: could not find function: '_find_next_bit' 2020/06/13 05:46:28 adding functions to KCSAN blacklist: 'do_nanosleep' '__snd_rawmidi_transmit_ack' 'page_counter_charge' 'pcpu_alloc' 'generic_fillattr' 'do_syslog' 'find_get_pages_range_tag' '__send_signal' 'blk_mq_sched_dispatch_requests' 'blk_mq_get_request' 'run_timer_softirq' 'futex_wait_queue_me' 'kauditd_thread' 'fasync_remove_entry' 'io_sq_thread' 'file_update_time' 'ep_poll' 'add_timer' 'alloc_pid' 'echo_char' '_find_next_bit' 'xas_clear_mark' '__ext4_new_inode' 'copy_process' 'tick_nohz_next_event' 'generic_write_end' 'ext4_free_inodes_count' [ 70.857579][ T0] ================================================================== [ 70.865735][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_sched_do_timer [ 70.874221][ T0] [ 70.876548][ T0] write to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 0: [ 70.884178][ T0] tick_sched_do_timer+0xb4/0xd0 [ 70.889129][ T0] tick_sched_timer+0x3f/0xd0 [ 70.893792][ T0] __hrtimer_run_queues+0x271/0x600 [ 70.899080][ T0] hrtimer_interrupt+0x226/0x490 [ 70.903995][ T0] smp_apic_timer_interrupt+0xd8/0x270 [ 70.910053][ T0] apic_timer_interrupt+0xf/0x20 [ 70.914981][ T0] __this_cpu_preempt_check+0x40/0x130 [ 70.920432][ T0] ipt_do_table+0x1f6/0xe70 [ 70.925527][ T0] iptable_raw_hook+0x44/0x60 [ 70.930186][ T0] nf_hook_slow+0x7c/0x160 [ 70.934582][ T0] nf_hook_slow_list+0x140/0x29f [ 70.939590][ T0] ip_sublist_rcv+0x4f9/0x530 [ 70.944433][ T0] ip_list_rcv+0x2f3/0x321 [ 70.948832][ T0] __netif_receive_skb_list_core+0x368/0x5c0 [ 70.954789][ T0] netif_receive_skb_list_internal+0x5c7/0x810 [ 70.960919][ T0] gro_normal_list.part.0+0x37/0xa0 [ 70.966094][ T0] gro_normal_one+0x14c/0x160 [ 70.970764][ T0] napi_gro_receive+0x27d/0x2f0 [ 70.975591][ T0] receive_buf+0x24c/0x3420 [ 70.980078][ T0] virtnet_poll+0x343/0x790 [ 70.984559][ T0] net_rx_action+0x3ad/0xac0 [ 70.989126][ T0] __do_softirq+0x118/0x34a [ 70.993619][ T0] run_ksoftirqd+0x41/0x60 [ 70.998178][ T0] smpboot_thread_fn+0x374/0x4a0 [ 71.003141][ T0] kthread+0x203/0x230 [ 71.007363][ T0] ret_from_fork+0x1f/0x30 [ 71.011752][ T0] [ 71.014062][ T0] read to 0xffffffff8764e210 of 4 bytes by task 0 on cpu 1: [ 71.021343][ T0] tick_nohz_idle_stop_tick+0x191/0x680 [ 71.026880][ T0] do_idle+0x1ad/0x290 [ 71.030937][ T0] cpu_startup_entry+0x14/0x20 [ 71.035727][ T0] start_secondary+0x169/0x1b0 [ 71.040520][ T0] secondary_startup_64+0xa4/0xb0 [ 71.045514][ T0] [ 71.047818][ T0] Reported by Kernel Concurrency Sanitizer on: [ 71.054660][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-rc1-syzkaller #0 [ 71.062523][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 71.072565][ T0] ================================================================== [ 71.080600][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 71.087162][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-rc1-syzkaller #0 [ 71.095128][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 71.105154][ T0] Call Trace: [ 71.108440][ T0] dump_stack+0x11d/0x187 [ 71.112752][ T0] panic+0x210/0x640 [ 71.116637][ T0] ? vprintk_func+0x89/0x13a [ 71.121207][ T0] kcsan_report.cold+0xc/0x1a [ 71.125864][ T0] kcsan_setup_watchpoint+0x3fb/0x440 [ 71.131216][ T0] tick_nohz_idle_stop_tick+0x191/0x680 [ 71.136829][ T0] do_idle+0x1ad/0x290 [ 71.143917][ T0] ? debug_smp_processor_id+0x3a/0x129 [ 71.149368][ T0] cpu_startup_entry+0x14/0x20 [ 71.154126][ T0] start_secondary+0x169/0x1b0 [ 71.158869][ T0] secondary_startup_64+0xa4/0xb0 [ 71.165144][ T0] Kernel Offset: disabled [ 71.169483][ T0] Rebooting in 86400 seconds..