[ 44.602180][ T25] audit: type=1800 audit(1572387419.996:21): pid=7088 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 44.648645][ T25] audit: type=1800 audit(1572387419.996:22): pid=7088 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0 [ 44.670096][ T25] audit: type=1800 audit(1572387419.996:23): pid=7088 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rsyslog" dev="sda1" ino=2475 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] 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 '10.128.0.197' (ECDSA) to the list of known hosts. 2019/10/29 22:17:11 fuzzer started 2019/10/29 22:17:13 dialing manager at 10.128.0.105:40771 2019/10/29 22:17:13 syscalls: 2540 2019/10/29 22:17:13 code coverage: enabled 2019/10/29 22:17:13 comparison tracing: enabled 2019/10/29 22:17:13 extra coverage: extra coverage is not supported by the kernel 2019/10/29 22:17:13 setuid sandbox: enabled 2019/10/29 22:17:13 namespace sandbox: enabled 2019/10/29 22:17:13 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/29 22:17:13 fault injection: enabled 2019/10/29 22:17:13 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/29 22:17:13 net packet injection: enabled 2019/10/29 22:17:13 net device setup: enabled 2019/10/29 22:17:13 concurrency sanitizer: enabled syzkaller login: [ 62.549999][ T7251] KCSAN: could not find function: 'poll_schedule_timeout' 2019/10/29 22:17:37 adding functions to KCSAN blacklist: 'snd_ctl_notify' 'ktime_get_real_seconds' 'find_group_orlov' 'ext4_mark_iloc_dirty' '__hrtimer_run_queues' 'pipe_wait' 'xas_find_marked' '__nf_conntrack_find_get' 'ext4_free_inodes_count' 'sit_tunnel_xmit' 'blk_stat_add' 'relay_switch_subbuf' '__ext4_new_inode' 'getboottime64' 'kcm_wait_data' 'poll_schedule_timeout' 'copy_process' 'tomoyo_supervisor' 'blk_mq_get_request' 'snapshot_refaults' 'shmem_file_read_iter' 'iput' 'tcp_add_backlog' 'ep_poll' 'blk_mq_sched_dispatch_requests' 'blk_mq_dispatch_rq_list' 'echo_char' 'ip_finish_output2' '__delete_from_page_cache' '__nf_ct_refresh_acct' 'wbt_done' 'tick_sched_do_timer' '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' 'osq_lock' '__mark_inode_dirty' 'commit_echoes' 'kauditd_thread' 'generic_permission' 'vm_area_dup' 'process_srcu' 'page_counter_try_charge' '__snd_rawmidi_transmit_ack' '__skb_wait_for_more_packets' 'generic_file_read_iter' 'mem_cgroup_select_victim_node' 'inet_putpeer' 'task_dump_owner' 'mod_timer' 'ext4_has_free_clusters' 'd_alloc_parallel' 'generic_write_end' 'tick_do_update_jiffies64' 'rcu_gp_fqs_loop' 'pid_update_inode' 'list_lru_add' 'run_timer_softirq' 'add_timer' 'generic_fillattr' '__add_to_page_cache_locked' 'virtqueue_disable_cb' 'taskstats_exit' 'enqueue_timer' 'mm_update_next_owner' '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' 'p9_poll_workfn' 'sk_wait_data' 'yama_ptracer_del' 'kernfs_refresh_inode' 'udp_set_dev_scratch' 'find_next_bit' 'queue_access_lock' 'pipe_poll' 'blk_mq_run_hw_queue' 'do_nanosleep' 'find_get_pages_range_tag' '__cgroup_account_cputime' 'atime_needs_update' 'ktime_get_seconds' 'icmp_global_allow' 'do_syslog' 'dccp_rcv_reset' 'n_tty_receive_buf_common' 'snd_seq_prioq_cell_out' '__dev_queue_xmit' 'ext4_mb_good_group' 'mem_cgroup_protected' 'alloc_pid' 'exit_signals' 'do_readlinkat' 'fsnotify' 'do_exit' 'tcp_poll' 'filemap_map_pages' 'timer_clear_idle' '__skb_try_recv_from_queue' [ 267.009937][ C1] ================================================================== [ 267.018074][ C1] BUG: KCSAN: data-race in ktime_get_with_offset / timekeeping_advance [ 267.026381][ C1] [ 267.028796][ C1] write to 0xffffffff86040b08 of 280 bytes by interrupt on cpu 0: [ 267.036583][ C1] timekeeping_advance+0x893/0xd80 [ 267.041669][ C1] update_wall_time+0x19/0x20 [ 267.046338][ C1] tick_do_update_jiffies64+0x1ae/0x260 [ 267.051864][ C1] tick_sched_do_timer+0xd4/0xe0 [ 267.056778][ C1] tick_sched_timer+0x43/0xe0 [ 267.061429][ C1] __hrtimer_run_queues+0x288/0x600 [ 267.066599][ C1] hrtimer_interrupt+0x22a/0x480 [ 267.071513][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 267.076942][ C1] apic_timer_interrupt+0xf/0x20 [ 267.081856][ C1] __kcsan_setup_watchpoint+0x268/0x4a0 [ 267.087372][ C1] __tsan_read4+0x2c/0x30 [ 267.091676][ C1] __tcp_transmit_skb+0xac5/0x1d60 [ 267.096758][ C1] __tcp_send_ack+0x246/0x300 [ 267.101405][ C1] tcp_send_ack+0x34/0x40 [ 267.105709][ C1] [ 267.108014][ C1] read to 0xffffffff86040b24 of 4 bytes by interrupt on cpu 1: [ 267.115532][ C1] ktime_get_with_offset+0x14d/0x230 [ 267.121059][ C1] netif_receive_skb_internal+0x13e/0x190 [ 267.126750][ C1] napi_gro_receive+0x28f/0x330 [ 267.131575][ C1] receive_buf+0x284/0x30b0 [ 267.136048][ C1] virtnet_poll+0x436/0x7d0 [ 267.140525][ C1] net_rx_action+0x3ae/0xa90 [ 267.145096][ C1] __do_softirq+0x115/0x33f [ 267.149583][ C1] run_ksoftirqd+0x46/0x60 [ 267.153974][ C1] smpboot_thread_fn+0x37d/0x4a0 [ 267.159032][ C1] kthread+0x1d4/0x200 [ 267.163091][ C1] ret_from_fork+0x1f/0x30 [ 267.167486][ C1] [ 267.169799][ C1] Reported by Kernel Concurrency Sanitizer on: [ 267.175932][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.4.0-rc3+ #0 [ 267.183274][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 267.193304][ C1] ================================================================== [ 267.201338][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 267.207902][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.4.0-rc3+ #0 [ 267.215243][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 267.225279][ C1] Call Trace: [ 267.228550][ C1] dump_stack+0xf5/0x159 [ 267.232772][ C1] panic+0x210/0x640 [ 267.236644][ C1] ? smpboot_thread_fn+0x37d/0x4a0 [ 267.241728][ C1] ? vprintk_func+0x8d/0x140 [ 267.246308][ C1] kcsan_report.cold+0xc/0x10 [ 267.250964][ C1] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 267.256496][ C1] __tsan_read4+0x2c/0x30 [ 267.260812][ C1] ktime_get_with_offset+0x14d/0x230 [ 267.266077][ C1] netif_receive_skb_internal+0x13e/0x190 [ 267.271773][ C1] napi_gro_receive+0x28f/0x330 [ 267.276601][ C1] receive_buf+0x284/0x30b0 [ 267.281086][ C1] ? __tsan_write8+0x32/0x40 [ 267.285660][ C1] ? virtqueue_get_buf_ctx+0x4fd/0x5c0 [ 267.291102][ C1] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 267.296717][ C1] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 267.302325][ C1] virtnet_poll+0x436/0x7d0 [ 267.306819][ C1] net_rx_action+0x3ae/0xa90 [ 267.311389][ C1] __do_softirq+0x115/0x33f [ 267.315868][ C1] ? takeover_tasklets+0x250/0x250 [ 267.320952][ C1] run_ksoftirqd+0x46/0x60 [ 267.325346][ C1] smpboot_thread_fn+0x37d/0x4a0 [ 267.330285][ C1] kthread+0x1d4/0x200 [ 267.334331][ C1] ? constant_test_bit.constprop.0+0x30/0x30 [ 267.340282][ C1] ? kthread_stop+0x2d0/0x2d0 [ 267.344934][ C1] ret_from_fork+0x1f/0x30 [ 267.350723][ C1] Kernel Offset: disabled [ 267.355042][ C1] Rebooting in 86400 seconds..