[ 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 '10.128.0.144' (ECDSA) to the list of known hosts. 2020/07/04 13:28:22 fuzzer started 2020/07/04 13:28:22 dialing manager at 10.128.0.105:38861 2020/07/04 13:28:24 syscalls: 3108 2020/07/04 13:28:24 code coverage: enabled 2020/07/04 13:28:24 comparison tracing: enabled 2020/07/04 13:28:24 extra coverage: enabled 2020/07/04 13:28:24 setuid sandbox: enabled 2020/07/04 13:28:24 namespace sandbox: enabled 2020/07/04 13:28:24 Android sandbox: /sys/fs/selinux/policy does not exist 2020/07/04 13:28:24 fault injection: enabled 2020/07/04 13:28:24 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/07/04 13:28:24 net packet injection: enabled 2020/07/04 13:28:24 net device setup: enabled 2020/07/04 13:28:24 concurrency sanitizer: enabled 2020/07/04 13:28:24 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/07/04 13:28:24 USB emulation: enabled 2020/07/04 13:28:26 suppressing KCSAN reports in functions: '__xa_clear_mark' 'find_get_pages_range_tag' 'snd_seq_check_queue' 'expire_timers' 'alloc_pid' 'ext4_free_inode' 'generic_write_end' '__ext4_new_inode' 'dd_has_work' 'exit_mm' 'ext4_da_write_end' 'page_counter_charge' 'do_epoll_wait' 'blk_mq_sched_dispatch_requests' 'futex_wait_queue_me' 'do_nanosleep' 'blk_mq_dispatch_rq_list' 'snd_rawmidi_proceed' 'binder_thread_read' 'pcpu_alloc' syzkaller login: [ 36.802469][ C1] ================================================================== [ 36.810665][ C1] BUG: KCSAN: data-race in __mod_timer / timer_clear_idle [ 36.817747][ C1] [ 36.820064][ C1] write to 0xffff88812c01cb24 of 1 bytes by task 0 on cpu 0: [ 36.827531][ C1] timer_clear_idle+0x2e/0x40 [ 36.832180][ C1] tick_nohz_idle_retain_tick+0x3e/0x40 [ 36.837692][ C1] do_idle+0x287/0x310 [ 36.841841][ C1] cpu_startup_entry+0x15/0x20 [ 36.846576][ C1] rest_init+0xd8/0xe0 [ 36.852181][ C1] arch_call_rest_init+0xa/0xb [ 36.856912][ C1] start_kernel+0x608/0x6d0 [ 36.861541][ C1] secondary_startup_64+0xa4/0xb0 [ 36.866534][ C1] [ 36.868958][ C1] read to 0xffff88812c01cb24 of 1 bytes by interrupt on cpu 1: [ 36.877457][ C1] __mod_timer+0xb87/0xf00 [ 36.881858][ C1] mod_timer+0x1b/0x20 [ 36.885910][ C1] sk_reset_timer+0x1f/0xa0 [ 36.890569][ C1] tcp_send_delayed_ack+0x191/0x250 [ 36.895741][ C1] __tcp_ack_snd_check+0x326/0x500 [ 36.900908][ C1] tcp_rcv_established+0xb3e/0x1520 [ 36.906254][ C1] tcp_v4_do_rcv+0x25e/0x480 [ 36.910829][ C1] tcp_v4_rcv+0x219b/0x2420 [ 36.915377][ C1] ip_protocol_deliver_rcu+0x1f9/0x400 [ 36.920820][ C1] ip_local_deliver+0x1d6/0x2a0 [ 36.925669][ C1] ip_sublist_rcv+0x4d4/0x5a0 [ 36.930334][ C1] ip_list_rcv+0x262/0x290 [ 36.934741][ C1] __netif_receive_skb_list_core+0x34b/0x450 [ 36.940717][ C1] __netif_receive_skb_list+0x298/0x310 [ 36.946239][ C1] netif_receive_skb_list_internal+0xda/0x330 [ 36.952397][ C1] napi_gro_receive+0x329/0x5a0 [ 36.957448][ C1] receive_buf+0x7a4/0xcf0 [ 36.961926][ C1] virtnet_poll+0x2fa/0x780 [ 36.968081][ C1] napi_poll+0x178/0x4a0 [ 36.972359][ C1] net_rx_action+0x1ba/0x530 [ 36.976980][ C1] __do_softirq+0x198/0x360 [ 36.981485][ C1] run_ksoftirqd+0x2f/0x60 [ 36.985966][ C1] smpboot_thread_fn+0x347/0x530 [ 36.990877][ C1] kthread+0x20d/0x230 [ 36.995026][ C1] ret_from_fork+0x1f/0x30 [ 36.999519][ C1] [ 37.001825][ C1] Reported by Kernel Concurrency Sanitizer on: [ 37.007961][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.8.0-rc3-syzkaller #0 [ 37.016083][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.026363][ C1] ================================================================== [ 37.034647][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 37.041243][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.8.0-rc3-syzkaller #0 [ 37.049366][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.059407][ C1] Call Trace: [ 37.062782][ C1] dump_stack+0x10f/0x19d [ 37.067083][ C1] panic+0x207/0x64a [ 37.070950][ C1] ? vprintk_emit+0x44a/0x4f0 [ 37.075615][ C1] kcsan_report+0x684/0x690 [ 37.080124][ C1] ? kcsan_setup_watchpoint+0x453/0x4d0 [ 37.086038][ C1] ? __mod_timer+0xb87/0xf00 [ 37.090687][ C1] ? mod_timer+0x1b/0x20 [ 37.094911][ C1] ? sk_reset_timer+0x1f/0xa0 [ 37.099575][ C1] ? tcp_send_delayed_ack+0x191/0x250 [ 37.104995][ C1] ? __tcp_ack_snd_check+0x326/0x500 [ 37.110380][ C1] ? tcp_rcv_established+0xb3e/0x1520 [ 37.115750][ C1] ? tcp_v4_do_rcv+0x25e/0x480 [ 37.120628][ C1] ? tcp_v4_rcv+0x219b/0x2420 [ 37.125304][ C1] ? ip_protocol_deliver_rcu+0x1f9/0x400 [ 37.130917][ C1] ? ip_local_deliver+0x1d6/0x2a0 [ 37.137403][ C1] ? ip_sublist_rcv+0x4d4/0x5a0 [ 37.142372][ C1] ? ip_list_rcv+0x262/0x290 [ 37.146940][ C1] ? __netif_receive_skb_list_core+0x34b/0x450 [ 37.153070][ C1] ? __netif_receive_skb_list+0x298/0x310 [ 37.158780][ C1] ? netif_receive_skb_list_internal+0xda/0x330 [ 37.164999][ C1] ? napi_gro_receive+0x329/0x5a0 [ 37.169991][ C1] ? receive_buf+0x7a4/0xcf0 [ 37.174573][ C1] ? virtnet_poll+0x2fa/0x780 [ 37.179220][ C1] ? napi_poll+0x178/0x4a0 [ 37.183609][ C1] ? net_rx_action+0x1ba/0x530 [ 37.188346][ C1] ? __do_softirq+0x198/0x360 [ 37.192995][ C1] ? run_ksoftirqd+0x2f/0x60 [ 37.197576][ C1] ? smpboot_thread_fn+0x347/0x530 [ 37.202658][ C1] ? kthread+0x20d/0x230 [ 37.206877][ C1] ? ret_from_fork+0x1f/0x30 [ 37.211564][ C1] ? __wake_up_sync_key+0x90/0xc0 [ 37.216713][ C1] ? __wake_up_sync_key+0x90/0xc0 [ 37.221733][ C1] kcsan_setup_watchpoint+0x453/0x4d0 [ 37.227130][ C1] ? __wake_up_sync_key+0x90/0xc0 [ 37.232135][ C1] __mod_timer+0xb87/0xf00 [ 37.236536][ C1] mod_timer+0x1b/0x20 [ 37.240585][ C1] sk_reset_timer+0x1f/0xa0 [ 37.245067][ C1] tcp_send_delayed_ack+0x191/0x250 [ 37.250373][ C1] __tcp_ack_snd_check+0x326/0x500 [ 37.255558][ C1] tcp_rcv_established+0xb3e/0x1520 [ 37.260745][ C1] tcp_v4_do_rcv+0x25e/0x480 [ 37.265311][ C1] tcp_v4_rcv+0x219b/0x2420 [ 37.269793][ C1] ip_protocol_deliver_rcu+0x1f9/0x400 [ 37.275221][ C1] ip_local_deliver+0x1d6/0x2a0 [ 37.280060][ C1] ? ip_local_deliver+0x2a0/0x2a0 [ 37.285077][ C1] ip_sublist_rcv+0x4d4/0x5a0 [ 37.289805][ C1] ? ip_rcv_core+0x620/0x620 [ 37.294379][ C1] ip_list_rcv+0x262/0x290 [ 37.298769][ C1] ? ip_rcv_finish+0x160/0x160 [ 37.303595][ C1] __netif_receive_skb_list_core+0x34b/0x450 [ 37.309550][ C1] ? idtentry_exit_cond_rcu+0x2e/0x30 [ 37.314893][ C1] __netif_receive_skb_list+0x298/0x310 [ 37.320409][ C1] ? netif_receive_skb_list_internal+0x15d/0x330 [ 37.326915][ C1] netif_receive_skb_list_internal+0xda/0x330 [ 37.333257][ C1] napi_gro_receive+0x329/0x5a0 [ 37.338087][ C1] receive_buf+0x7a4/0xcf0 [ 37.342484][ C1] virtnet_poll+0x2fa/0x780 [ 37.347154][ C1] napi_poll+0x178/0x4a0 [ 37.351373][ C1] net_rx_action+0x1ba/0x530 [ 37.355952][ C1] __do_softirq+0x198/0x360 [ 37.360443][ C1] ? ksoftirqd_should_run+0x20/0x20 [ 37.365699][ C1] run_ksoftirqd+0x2f/0x60 [ 37.370101][ C1] smpboot_thread_fn+0x347/0x530 [ 37.375100][ C1] ? cpu_report_death+0x80/0x80 [ 37.379920][ C1] kthread+0x20d/0x230 [ 37.383961][ C1] ? cpu_report_death+0x80/0x80 [ 37.388784][ C1] ? kthread_blkcg+0x80/0x80 [ 37.393360][ C1] ret_from_fork+0x1f/0x30 [ 37.399273][ C1] Kernel Offset: disabled [ 37.403700][ C1] Rebooting in 86400 seconds..