[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.988956][ T26] audit: type=1800 audit(1572387347.175:25): pid=7048 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.043497][ T26] audit: type=1800 audit(1572387347.185:26): pid=7048 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.069706][ T26] audit: type=1800 audit(1572387347.185:27): pid=7048 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 '10.128.0.137' (ECDSA) to the list of known hosts. 2019/10/29 22:15:57 fuzzer started 2019/10/29 22:15:59 dialing manager at 10.128.0.105:40771 2019/10/29 22:15:59 syscalls: 2540 2019/10/29 22:15:59 code coverage: enabled 2019/10/29 22:15:59 comparison tracing: enabled 2019/10/29 22:15:59 extra coverage: extra coverage is not supported by the kernel 2019/10/29 22:15:59 setuid sandbox: enabled 2019/10/29 22:15:59 namespace sandbox: enabled 2019/10/29 22:15:59 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/29 22:15:59 fault injection: enabled 2019/10/29 22:15:59 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/29 22:15:59 net packet injection: enabled 2019/10/29 22:15:59 net device setup: enabled 2019/10/29 22:15:59 concurrency sanitizer: enabled syzkaller login: [ 66.734818][ T7216] KCSAN: could not find function: 'poll_schedule_timeout' 2019/10/29 22:16:23 adding functions to KCSAN blacklist: 'osq_lock' 'generic_permission' 'vm_area_dup' 'process_srcu' '__mark_inode_dirty' 'commit_echoes' 'kauditd_thread' 'page_counter_try_charge' '__snd_rawmidi_transmit_ack' '__skb_wait_for_more_packets' 'task_dump_owner' 'mod_timer' 'ext4_has_free_clusters' 'generic_file_read_iter' 'mem_cgroup_select_victim_node' 'inet_putpeer' 'generic_write_end' 'tick_do_update_jiffies64' 'rcu_gp_fqs_loop' 'd_alloc_parallel' 'pid_update_inode' 'run_timer_softirq' 'add_timer' 'generic_fillattr' 'list_lru_add' 'taskstats_exit' 'enqueue_timer' 'mm_update_next_owner' '__add_to_page_cache_locked' 'virtqueue_disable_cb' 'rcu_gp_fqs_check_wake' 'bio_endio' '__find_get_block' 'update_defense_level' 'ext4_nonda_switch' 'ext4_da_write_end' 'get_signal' 'tcp_v4_rcv' 'pcpu_alloc' 'install_new_memslots' 'unix_release_sock' 'kernfs_refresh_inode' 'udp_set_dev_scratch' 'find_next_bit' 'queue_access_lock' 'pipe_poll' 'p9_poll_workfn' 'sk_wait_data' 'yama_ptracer_del' 'do_nanosleep' 'find_get_pages_range_tag' '__cgroup_account_cputime' 'blk_mq_run_hw_queue' 'ktime_get_seconds' 'icmp_global_allow' 'do_syslog' 'atime_needs_update' 'dccp_rcv_reset' 'n_tty_receive_buf_common' 'snd_seq_prioq_cell_out' 'alloc_pid' 'exit_signals' 'do_readlinkat' '__dev_queue_xmit' 'ext4_mb_good_group' 'mem_cgroup_protected' 'do_exit' 'tcp_poll' 'filemap_map_pages' 'fsnotify' 'timer_clear_idle' '__skb_try_recv_from_queue' 'ktime_get_real_seconds' 'find_group_orlov' 'ext4_mark_iloc_dirty' 'snd_ctl_notify' '__hrtimer_run_queues' 'pipe_wait' 'xas_find_marked' '__nf_conntrack_find_get' 'ext4_free_inodes_count' 'sit_tunnel_xmit' '__ext4_new_inode' 'getboottime64' 'kcm_wait_data' 'blk_stat_add' 'relay_switch_subbuf' 'poll_schedule_timeout' 'copy_process' 'tomoyo_supervisor' 'blk_mq_get_request' 'snapshot_refaults' 'tcp_add_backlog' 'ep_poll' 'blk_mq_sched_dispatch_requests' 'shmem_file_read_iter' 'iput' '__delete_from_page_cache' '__nf_ct_refresh_acct' 'wbt_done' 'tick_sched_do_timer' 'blk_mq_dispatch_rq_list' 'echo_char' 'ip_finish_output2' 'dd_has_work' 'ktime_get_ts64' '__alloc_file' 'ext4_free_inode' 'get_task_cred' 'tick_nohz_idle_stop_tick' 'blk_mq_free_request' 'shmem_getpage_gfp' [ 149.680490][ C1] ================================================================== [ 149.688728][ C1] BUG: KCSAN: data-race in ktime_get_with_offset / timekeeping_advance [ 149.696944][ C1] [ 149.699257][ C1] write to 0xffffffff86040b08 of 280 bytes by interrupt on cpu 0: [ 149.707038][ C1] timekeeping_advance+0x893/0xd80 [ 149.712165][ C1] update_wall_time+0x19/0x20 [ 149.716818][ C1] tick_do_update_jiffies64+0x1ae/0x260 [ 149.722338][ C1] tick_sched_do_timer+0xd4/0xe0 [ 149.727249][ C1] tick_sched_timer+0x43/0xe0 [ 149.732014][ C1] __hrtimer_run_queues+0x288/0x600 [ 149.737187][ C1] hrtimer_interrupt+0x22a/0x480 [ 149.742098][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 149.747531][ C1] apic_timer_interrupt+0xf/0x20 [ 149.752443][ C1] __kcsan_setup_watchpoint+0x268/0x4a0 [ 149.757984][ C1] __tsan_read8+0x2c/0x30 [ 149.762287][ C1] ipt_do_table+0x46f/0xe60 [ 149.766761][ C1] iptable_mangle_hook+0x132/0x260 [ 149.771849][ C1] nf_hook_slow+0x83/0x160 [ 149.776235][ C1] [ 149.778541][ C1] read to 0xffffffff86040b28 of 8 bytes by interrupt on cpu 1: [ 149.786056][ C1] ktime_get_with_offset+0x136/0x230 [ 149.791315][ C1] netif_receive_skb_internal+0x13e/0x190 [ 149.797016][ C1] napi_gro_receive+0x28f/0x330 [ 149.801885][ C1] receive_buf+0x284/0x30b0 [ 149.806362][ C1] virtnet_poll+0x436/0x7d0 [ 149.810841][ C1] net_rx_action+0x3ae/0xa90 [ 149.815411][ C1] __do_softirq+0x115/0x33f [ 149.819891][ C1] run_ksoftirqd+0x46/0x60 [ 149.824282][ C1] smpboot_thread_fn+0x37d/0x4a0 [ 149.829190][ C1] kthread+0x1d4/0x200 [ 149.833231][ C1] ret_from_fork+0x1f/0x30 [ 149.837653][ C1] [ 149.839954][ C1] Reported by Kernel Concurrency Sanitizer on: [ 149.846089][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.4.0-rc3+ #0 [ 149.853474][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 149.863505][ C1] ================================================================== [ 149.871539][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 149.878099][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.4.0-rc3+ #0 [ 149.885442][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 149.895471][ C1] Call Trace: [ 149.898740][ C1] dump_stack+0xf5/0x159 [ 149.902958][ C1] panic+0x210/0x640 [ 149.906830][ C1] ? smpboot_thread_fn+0x37d/0x4a0 [ 149.911934][ C1] ? vprintk_func+0x8d/0x140 [ 149.916506][ C1] kcsan_report.cold+0xc/0x10 [ 149.921165][ C1] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 149.926690][ C1] __tsan_read8+0x2c/0x30 [ 149.931004][ C1] ktime_get_with_offset+0x136/0x230 [ 149.936274][ C1] netif_receive_skb_internal+0x13e/0x190 [ 149.941971][ C1] napi_gro_receive+0x28f/0x330 [ 149.946800][ C1] receive_buf+0x284/0x30b0 [ 149.951281][ C1] ? __tsan_write8+0x32/0x40 [ 149.955919][ C1] ? virtqueue_get_buf_ctx+0x4fd/0x5c0 [ 149.961400][ C1] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 149.967013][ C1] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 149.972624][ C1] virtnet_poll+0x436/0x7d0 [ 149.977109][ C1] net_rx_action+0x3ae/0xa90 [ 149.981682][ C1] __do_softirq+0x115/0x33f [ 149.986165][ C1] ? takeover_tasklets+0x250/0x250 [ 149.991251][ C1] run_ksoftirqd+0x46/0x60 [ 149.995645][ C1] smpboot_thread_fn+0x37d/0x4a0 [ 150.000557][ C1] kthread+0x1d4/0x200 [ 150.004612][ C1] ? constant_test_bit.constprop.0+0x30/0x30 [ 150.010569][ C1] ? kthread_stop+0x2d0/0x2d0 [ 150.015219][ C1] ret_from_fork+0x1f/0x30 [ 150.020799][ C1] Kernel Offset: disabled [ 150.025119][ C1] Rebooting in 86400 seconds..