[ 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 '10.128.10.13' (ECDSA) to the list of known hosts. 2020/06/23 18:20:46 fuzzer started 2020/06/23 18:20:47 dialing manager at 10.128.0.105:42469 2020/06/23 18:20:47 syscalls: 3103 2020/06/23 18:20:47 code coverage: enabled 2020/06/23 18:20:47 comparison tracing: enabled 2020/06/23 18:20:47 extra coverage: enabled 2020/06/23 18:20:47 setuid sandbox: enabled 2020/06/23 18:20:47 namespace sandbox: enabled 2020/06/23 18:20:47 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/23 18:20:47 fault injection: enabled 2020/06/23 18:20:47 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/23 18:20:47 net packet injection: enabled 2020/06/23 18:20:47 net device setup: enabled 2020/06/23 18:20:47 concurrency sanitizer: enabled 2020/06/23 18:20:47 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/23 18:20:47 USB emulation: enabled 2020/06/23 18:20:49 suppressing KCSAN reports in functions: 'do_signal_stop' 'blk_mq_sched_dispatch_requests' 'ext4_mb_good_group' 'exit_signals' 'wg_packet_send_staged_packets' '__ext4_new_inode' '__xa_clear_mark' 'ext4_free_inodes_count' 'dd_has_work' '__delete_from_page_cache' 'complete_signal' 'ext4_mark_iloc_dirty' 'do_epoll_wait' 'generic_write_end' 'do_select' 'ext4_free_inode' 'xas_clear_mark' 'copy_process' '__delayacct_blkio_end' 'pcpu_alloc' 'n_tty_receive_char_inline' 'do_nanosleep' 'page_counter_charge' 'expire_timers' 'blk_mq_rq_ctx_init' 'blk_mq_dispatch_rq_list' syzkaller login: [ 35.480498][ C0] ================================================================== [ 35.488600][ C0] BUG: KCSAN: data-race in __mod_timer / timer_clear_idle [ 35.495681][ C0] [ 35.498000][ C0] write to 0xffff88812c11cb24 of 1 bytes by task 0 on cpu 1: [ 35.505337][ C0] timer_clear_idle+0x2e/0x40 [ 35.509990][ C0] tick_nohz_idle_retain_tick+0x3e/0x40 [ 35.515524][ C0] do_idle+0x290/0x320 [ 35.519561][ C0] cpu_startup_entry+0x15/0x20 [ 35.524297][ C0] start_secondary+0xe3/0x110 [ 35.528972][ C0] secondary_startup_64+0xa4/0xb0 [ 35.533965][ C0] [ 35.536268][ C0] read to 0xffff88812c11cb24 of 1 bytes by interrupt on cpu 0: [ 35.543792][ C0] __mod_timer+0xb87/0xf00 [ 35.548177][ C0] mod_timer+0x1b/0x20 [ 35.552220][ C0] sk_reset_timer+0x1f/0xa0 [ 35.556691][ C0] tcp_send_delayed_ack+0x191/0x250 [ 35.561875][ C0] __tcp_ack_snd_check+0x326/0x500 [ 35.566955][ C0] tcp_rcv_established+0xed6/0x1110 [ 35.572121][ C0] tcp_v4_do_rcv+0x25e/0x480 [ 35.576680][ C0] tcp_v4_rcv+0x2159/0x23e0 [ 35.581149][ C0] ip_protocol_deliver_rcu+0x1f9/0x400 [ 35.586586][ C0] ip_local_deliver+0x1d6/0x2a0 [ 35.591428][ C0] ip_sublist_rcv+0x4d4/0x5a0 [ 35.596089][ C0] ip_list_rcv+0x262/0x290 [ 35.600479][ C0] __netif_receive_skb_list_core+0x34b/0x450 [ 35.606441][ C0] __netif_receive_skb_list+0x298/0x310 [ 35.611975][ C0] netif_receive_skb_list_internal+0xda/0x330 [ 35.618035][ C0] napi_complete_done+0x1a1/0x3c0 [ 35.623041][ C0] virtqueue_napi_complete+0x28/0x80 [ 35.628297][ C0] virtnet_poll+0x64f/0x780 [ 35.632780][ C0] napi_poll+0x154/0x480 [ 35.637314][ C0] net_rx_action+0x1ba/0x530 [ 35.641874][ C0] __do_softirq+0x198/0x360 [ 35.646348][ C0] run_ksoftirqd+0x2f/0x60 [ 35.650791][ C0] smpboot_thread_fn+0x347/0x530 [ 35.655711][ C0] kthread+0x210/0x220 [ 35.659793][ C0] ret_from_fork+0x1f/0x30 [ 35.664264][ C0] [ 35.666576][ C0] Reported by Kernel Concurrency Sanitizer on: [ 35.672770][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.8.0-rc2-syzkaller #0 [ 35.680846][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.690899][ C0] ================================================================== [ 35.698934][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 35.705514][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.8.0-rc2-syzkaller #0 [ 35.713540][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.723576][ C0] Call Trace: [ 35.726839][ C0] dump_stack+0x10f/0x19d [ 35.731225][ C0] panic+0x1f8/0x63a [ 35.735104][ C0] ? vprintk_emit+0x44a/0x4f0 [ 35.739773][ C0] kcsan_report+0x684/0x690 [ 35.744247][ C0] ? kcsan_setup_watchpoint+0x453/0x4d0 [ 35.749768][ C0] ? __mod_timer+0xb87/0xf00 [ 35.754334][ C0] ? mod_timer+0x1b/0x20 [ 35.758554][ C0] ? sk_reset_timer+0x1f/0xa0 [ 35.763220][ C0] ? tcp_send_delayed_ack+0x191/0x250 [ 35.768909][ C0] ? __tcp_ack_snd_check+0x326/0x500 [ 35.774179][ C0] ? tcp_rcv_established+0xed6/0x1110 [ 35.779605][ C0] ? tcp_v4_do_rcv+0x25e/0x480 [ 35.784351][ C0] ? tcp_v4_rcv+0x2159/0x23e0 [ 35.789004][ C0] ? ip_protocol_deliver_rcu+0x1f9/0x400 [ 35.794645][ C0] ? ip_local_deliver+0x1d6/0x2a0 [ 35.799643][ C0] ? ip_sublist_rcv+0x4d4/0x5a0 [ 35.804739][ C0] ? ip_list_rcv+0x262/0x290 [ 35.809316][ C0] ? __netif_receive_skb_list_core+0x34b/0x450 [ 35.815461][ C0] ? __netif_receive_skb_list+0x298/0x310 [ 35.821172][ C0] ? netif_receive_skb_list_internal+0xda/0x330 [ 35.827395][ C0] ? napi_complete_done+0x1a1/0x3c0 [ 35.832569][ C0] ? virtqueue_napi_complete+0x28/0x80 [ 35.838000][ C0] ? virtnet_poll+0x64f/0x780 [ 35.842646][ C0] ? napi_poll+0x154/0x480 [ 35.847030][ C0] ? net_rx_action+0x1ba/0x530 [ 35.851774][ C0] ? __do_softirq+0x198/0x360 [ 35.856430][ C0] ? run_ksoftirqd+0x2f/0x60 [ 35.860988][ C0] ? smpboot_thread_fn+0x347/0x530 [ 35.866066][ C0] ? kthread+0x210/0x220 [ 35.870277][ C0] ? ret_from_fork+0x1f/0x30 [ 35.874840][ C0] ? __tcp_transmit_skb+0x13b1/0x1810 [ 35.880180][ C0] ? check_preemption_disabled+0x3f/0x1a0 [ 35.885868][ C0] kcsan_setup_watchpoint+0x453/0x4d0 [ 35.891219][ C0] __mod_timer+0xb87/0xf00 [ 35.895602][ C0] mod_timer+0x1b/0x20 [ 35.899636][ C0] sk_reset_timer+0x1f/0xa0 [ 35.904118][ C0] tcp_send_delayed_ack+0x191/0x250 [ 35.909286][ C0] __tcp_ack_snd_check+0x326/0x500 [ 35.914375][ C0] tcp_rcv_established+0xed6/0x1110 [ 35.919645][ C0] tcp_v4_do_rcv+0x25e/0x480 [ 35.924213][ C0] tcp_v4_rcv+0x2159/0x23e0 [ 35.928698][ C0] ? nf_confirm+0x201/0x230 [ 35.933172][ C0] ip_protocol_deliver_rcu+0x1f9/0x400 [ 35.938600][ C0] ip_local_deliver+0x1d6/0x2a0 [ 35.943426][ C0] ? ip_local_deliver+0x2a0/0x2a0 [ 35.948426][ C0] ip_sublist_rcv+0x4d4/0x5a0 [ 35.953073][ C0] ? ip_rcv_core+0x620/0x620 [ 35.957630][ C0] ip_list_rcv+0x262/0x290 [ 35.962025][ C0] ? ip_rcv_finish+0x160/0x160 [ 35.966754][ C0] __netif_receive_skb_list_core+0x34b/0x450 [ 35.972712][ C0] __netif_receive_skb_list+0x298/0x310 [ 35.978242][ C0] netif_receive_skb_list_internal+0xda/0x330 [ 35.984274][ C0] napi_complete_done+0x1a1/0x3c0 [ 35.989374][ C0] virtqueue_napi_complete+0x28/0x80 [ 35.994626][ C0] virtnet_poll+0x64f/0x780 [ 35.999109][ C0] napi_poll+0x154/0x480 [ 36.003316][ C0] net_rx_action+0x1ba/0x530 [ 36.007887][ C0] __do_softirq+0x198/0x360 [ 36.012527][ C0] ? ksoftirqd_should_run+0x20/0x20 [ 36.017738][ C0] run_ksoftirqd+0x2f/0x60 [ 36.022127][ C0] smpboot_thread_fn+0x347/0x530 [ 36.027037][ C0] ? cpu_report_death+0x80/0x80 [ 36.031888][ C0] kthread+0x210/0x220 [ 36.035930][ C0] ? cpu_report_death+0x80/0x80 [ 36.040749][ C0] ? constant_test_bit+0x30/0x30 [ 36.045660][ C0] ret_from_fork+0x1f/0x30 [ 37.154182][ C0] Shutting down cpus with NMI [ 37.160109][ C0] Kernel Offset: disabled [ 37.164419][ C0] Rebooting in 86400 seconds..