[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 38.374656][ T26] audit: type=1800 audit(1571872736.923:25): pid=7127 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 38.415418][ T26] audit: type=1800 audit(1571872736.923:26): pid=7127 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 38.444063][ T26] audit: type=1800 audit(1571872736.923:27): pid=7127 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.186' (ECDSA) to the list of known hosts. 2019/10/23 23:19:05 fuzzer started 2019/10/23 23:19:07 dialing manager at 10.128.0.105:40369 2019/10/23 23:19:07 syscalls: 2524 2019/10/23 23:19:07 code coverage: enabled 2019/10/23 23:19:07 comparison tracing: enabled 2019/10/23 23:19:07 extra coverage: extra coverage is not supported by the kernel 2019/10/23 23:19:07 setuid sandbox: enabled 2019/10/23 23:19:07 namespace sandbox: enabled 2019/10/23 23:19:07 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/23 23:19:07 fault injection: enabled 2019/10/23 23:19:07 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/23 23:19:07 net packet injection: enabled 2019/10/23 23:19:07 net device setup: enabled 2019/10/23 23:19:07 concurrency sanitizer: enabled syzkaller login: [ 56.119937][ T7293] KCSAN: could not find function: 'poll_schedule_timeout' 2019/10/23 23:19:27 adding functions to KCSAN blacklist: 'wbc_detach_inode' '__mark_inode_dirty' 'taskstats_exit' 'ext4_free_inode' 'do_nanosleep' 'futex_wait_queue_me' 'shmem_file_read_iter' 'vm_area_dup' 'tomoyo_domain_quota_is_ok' 'smpboot_thread_fn' 'mod_timer' 'ktime_get_seconds' 'snapshot_refaults' 'mem_cgroup_select_victim_node' 'pid_update_inode' 'rcu_gp_fqs_check_wake' 'ext4_mb_good_group' 'rcu_gp_fqs_loop' '__writeback_single_inode' 'blk_mq_dispatch_rq_list' 'wbt_wait' 'pipe_poll' 'blk_mq_sched_dispatch_requests' 'perf_event_update_userpage' 'generic_update_time' 'process_srcu' 'icmp_global_allow' 'xas_find_marked' 'udp_set_dev_scratch' '__nf_conntrack_find_get' 'ext4_has_free_clusters' 'vti_tunnel_xmit' '__splice_from_pipe' 'poll_schedule_timeout' '__ext4_new_inode' 'copy_process' 'run_timer_softirq' 'common_perm_cond' 'add_timer' 'tick_nohz_idle_stop_tick' 'page_counter_try_charge' 'tick_sched_do_timer' 'hrtimer_wakeup' '__add_to_page_cache_locked' '__dev_queue_xmit' 'handle_userfault' 'sit_tunnel_xmit' 'commit_echoes' '__dentry_kill' 'task_dump_owner' 'ext4_free_inodes_count' 'do_syslog' 'list_lru_count_one' 'tcp_sendmsg_locked' '__nf_ct_refresh_acct' 'tcp_poll' 'fanotify_handle_event' 'atime_needs_update' 'inet_putpeer' 'generic_fillattr' 'handle_mm_fault' '__ip4_datagram_connect' 'do_writev' 'ipip_tunnel_xmit' 'tcp_add_backlog' 'ep_poll' 'dd_has_work' '__filemap_fdatawrite_range' 'pipe_wait' 'ns_capable_common' 'osq_lock' 'pcpu_alloc' 'tick_do_update_jiffies64' 'ext4_writepages' 'kauditd_thread' 'do_wait' 'ext4_nonda_switch' 'kvm_arch_vcpu_load' '__alloc_file' 'tomoyo_supervisor' 'generic_permission' 'ktime_get_real_seconds' 'echo_char' 'find_next_bit' 'ksys_read' 'enqueue_timer' '__hrtimer_run_queues' 'mm_update_next_owner' 'blk_mq_run_hw_queue' 'n_tty_receive_buf_common' 'find_get_pages_range_tag' 'blk_mq_get_request' 'update_defense_level' 'timer_clear_idle' 'balance_dirty_pages' 'generic_write_end' 'wbt_issue' '__skb_wait_for_more_packets' '__snd_rawmidi_transmit_ack' 'bio_chain' [ 325.193621][ C0] ================================================================== [ 325.202165][ C0] BUG: KCSAN: data-race in ktime_get / timekeeping_advance [ 325.209335][ C0] [ 325.211649][ C0] write to 0xffffffff86040b08 of 280 bytes by interrupt on cpu 1: [ 325.219432][ C0] timekeeping_advance+0x893/0xd80 [ 325.224526][ C0] update_wall_time+0x19/0x20 [ 325.229199][ C0] tick_do_update_jiffies64+0x1ae/0x260 [ 325.234727][ C0] tick_sched_do_timer+0xd4/0xe0 [ 325.239644][ C0] tick_sched_timer+0x43/0xe0 [ 325.244302][ C0] __hrtimer_run_queues+0x288/0x600 [ 325.249493][ C0] hrtimer_interrupt+0x22a/0x480 [ 325.254416][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 325.259883][ C0] apic_timer_interrupt+0xf/0x20 [ 325.264804][ C0] native_safe_halt+0xe/0x10 [ 325.269380][ C0] arch_cpu_idle+0x1f/0x30 [ 325.273781][ C0] default_idle_call+0x1e/0x40 [ 325.278534][ C0] do_idle+0x1af/0x280 [ 325.282586][ C0] cpu_startup_entry+0x1b/0x20 [ 325.287329][ C0] [ 325.289669][ C0] read to 0xffffffff86040b30 of 8 bytes by interrupt on cpu 0: [ 325.297189][ C0] ktime_get+0x71/0x210 [ 325.301325][ C0] tcp_mstamp_refresh+0x1d/0x70 [ 325.306158][ C0] tcp_rcv_established+0x7c/0xf50 [ 325.311168][ C0] tcp_v4_do_rcv+0x381/0x4e0 [ 325.315739][ C0] tcp_v4_rcv+0x19dc/0x1bb0 [ 325.320222][ C0] ip_protocol_deliver_rcu+0x4d/0x420 [ 325.325576][ C0] ip_local_deliver_finish+0x110/0x140 [ 325.331022][ C0] ip_local_deliver+0x133/0x210 [ 325.335853][ C0] ip_rcv_finish+0x121/0x160 [ 325.340419][ C0] ip_rcv+0x18f/0x1a0 [ 325.344382][ C0] __netif_receive_skb_one_core+0xa7/0xe0 [ 325.350092][ C0] __netif_receive_skb+0x37/0xf0 [ 325.355013][ C0] netif_receive_skb_internal+0x59/0x190 [ 325.360885][ C0] [ 325.363191][ C0] Reported by Kernel Concurrency Sanitizer on: [ 325.369330][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.4.0-rc3+ #0 [ 325.376588][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 325.386629][ C0] ================================================================== [ 325.397905][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 325.404478][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.4.0-rc3+ #0 [ 325.411737][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 325.421780][ C0] Call Trace: [ 325.425059][ C0] dump_stack+0xf5/0x159 [ 325.429301][ C0] panic+0x210/0x640 [ 325.433179][ C0] ? ip_rcv_finish+0x121/0x160 [ 325.437928][ C0] ? vprintk_func+0x8d/0x140 [ 325.442504][ C0] kcsan_report.cold+0xc/0x10 [ 325.447167][ C0] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 325.452715][ C0] __tsan_read8+0x2c/0x30 [ 325.457028][ C0] ktime_get+0x71/0x210 [ 325.461170][ C0] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 325.466791][ C0] tcp_mstamp_refresh+0x1d/0x70 [ 325.471632][ C0] tcp_rcv_established+0x7c/0xf50 [ 325.476644][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 325.483475][ C0] ? __tsan_read4+0x2c/0x30 [ 325.487963][ C0] ? ipv4_dst_check+0xc6/0xf0 [ 325.492627][ C0] tcp_v4_do_rcv+0x381/0x4e0 [ 325.497203][ C0] tcp_v4_rcv+0x19dc/0x1bb0 [ 325.501689][ C0] ? __tsan_read8+0x2c/0x30 [ 325.506181][ C0] ip_protocol_deliver_rcu+0x4d/0x420 [ 325.511540][ C0] ip_local_deliver_finish+0x110/0x140 [ 325.516991][ C0] ip_local_deliver+0x133/0x210 [ 325.521838][ C0] ? ip_protocol_deliver_rcu+0x420/0x420 [ 325.527468][ C0] ip_rcv_finish+0x121/0x160 [ 325.532042][ C0] ip_rcv+0x18f/0x1a0 [ 325.536007][ C0] ? ip_sublist_rcv+0x5e0/0x5e0 [ 325.540842][ C0] ? ip_local_deliver+0x210/0x210 [ 325.545855][ C0] __netif_receive_skb_one_core+0xa7/0xe0 [ 325.551566][ C0] __netif_receive_skb+0x37/0xf0 [ 325.556490][ C0] netif_receive_skb_internal+0x59/0x190 [ 325.562107][ C0] napi_gro_receive+0x28f/0x330 [ 325.566950][ C0] receive_buf+0x284/0x30b0 [ 325.571463][ C0] ? __tsan_write8+0x32/0x40 [ 325.576045][ C0] ? virtqueue_get_buf_ctx+0x4fd/0x5c0 [ 325.581484][ C0] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 325.587112][ C0] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 325.592732][ C0] virtnet_poll+0x436/0x7d0 [ 325.597231][ C0] net_rx_action+0x3ae/0xa90 [ 325.601825][ C0] __do_softirq+0x115/0x33f [ 325.606331][ C0] ? takeover_tasklets+0x250/0x250 [ 325.611438][ C0] run_ksoftirqd+0x46/0x60 [ 325.615962][ C0] smpboot_thread_fn+0x37d/0x4a0 [ 325.620894][ C0] kthread+0x1d4/0x200 [ 325.625818][ C0] ? constant_test_bit.constprop.0+0x30/0x30 [ 325.631782][ C0] ? kthread_stop+0x2d0/0x2d0 [ 325.636447][ C0] ret_from_fork+0x1f/0x30 [ 325.642376][ C0] Kernel Offset: disabled [ 325.646706][ C0] Rebooting in 86400 seconds..