[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 42.388669][ T26] audit: type=1800 audit(1572475700.233:25): pid=7123 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 42.427924][ T26] audit: type=1800 audit(1572475700.233:26): pid=7123 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 42.475002][ T26] audit: type=1800 audit(1572475700.233:27): pid=7123 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 '10.128.0.149' (ECDSA) to the list of known hosts. 2019/10/30 22:48:30 fuzzer started 2019/10/30 22:48:32 dialing manager at 10.128.0.105:37477 2019/10/30 22:48:40 syscalls: 2540 2019/10/30 22:48:40 code coverage: enabled 2019/10/30 22:48:40 comparison tracing: enabled 2019/10/30 22:48:40 extra coverage: extra coverage is not supported by the kernel 2019/10/30 22:48:40 setuid sandbox: enabled 2019/10/30 22:48:40 namespace sandbox: enabled 2019/10/30 22:48:40 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/30 22:48:40 fault injection: enabled 2019/10/30 22:48:40 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/30 22:48:40 net packet injection: enabled 2019/10/30 22:48:40 net device setup: enabled 2019/10/30 22:48:40 concurrency sanitizer: enabled syzkaller login: [ 65.534261][ T7286] KCSAN: could not find function: 'kcm_abort_tx_psock' [ 66.483850][ T7286] KCSAN: could not find function: 'poll_schedule_timeout' 2019/10/30 22:48:57 adding functions to KCSAN blacklist: 'sctp_assoc_migrate' 'queue_access_lock' '__hrtimer_run_queues' 'task_dump_owner' 'xas_clear_mark' 'blk_mq_dispatch_rq_list' 'blk_mq_sched_dispatch_requests' 'futex_wait_queue_me' 'kcm_abort_tx_psock' 'mod_timer' 'audit_log_start' 'tick_sched_do_timer' 'generic_file_read_iter' 'poll_schedule_timeout' 'sk_wait_data' 'generic_write_end' 'tick_nohz_idle_stop_tick' 'ext4_free_inodes_count' 'do_syslog' 'tick_do_update_jiffies64' 'ktime_get_real_seconds' 'generic_permission' 'run_timer_softirq' '__alloc_file' '__skb_recv_udp' 'find_next_bit' '__rb_rotate_set_parents' 'mem_cgroup_select_victim_node' '__filemap_fdatawrite_range' 'ip6_tnl_start_xmit' 'del_timer' 'tcp_add_backlog' '__nf_conntrack_find_get' '__ext4_new_inode' 'rcu_gp_fqs_check_wake' 'tcp_poll' 'p9_poll_workfn' 'dput' 'pcpu_alloc' 'ext4_nonda_switch' 'pid_update_inode' 'blk_mq_get_request' 'pipe_wait' 'rcu_gp_fqs_loop' 'shmem_file_read_iter' 'ext4_has_free_clusters' 'ktime_get_seconds' 'wbt_done' 'bio_endio' 'ext4_mark_iloc_dirty' 'ext4_free_inode' 'update_defense_level' '__d_lookup_done' 'generic_fillattr' 'tomoyo_supervisor' 'dd_has_work' 'echo_char' 'process_srcu' 'watchdog' '__tcp_select_window' 'ep_poll' 'add_timer' 'xas_find_marked' '__nf_ct_refresh_acct' 'vm_area_dup' 'timer_clear_idle' '__splice_from_pipe' 'copy_process' 'ip6_tnl_xmit' 'do_nanosleep' 'taskstats_exit' 'inode_permission' 'pipe_poll' [ 245.415227][ C0] ================================================================== [ 245.423712][ C0] BUG: KCSAN: data-race in ktime_get / timekeeping_advance [ 245.430890][ C0] [ 245.433212][ C0] write to 0xffffffff86040b08 of 280 bytes by interrupt on cpu 1: [ 245.441008][ C0] timekeeping_advance+0x893/0xd80 [ 245.446117][ C0] update_wall_time+0x19/0x20 [ 245.450782][ C0] tick_do_update_jiffies64+0x1ae/0x260 [ 245.456312][ C0] tick_sched_do_timer+0xd4/0xe0 [ 245.461232][ C0] tick_sched_timer+0x43/0xe0 [ 245.465904][ C0] __hrtimer_run_queues+0x288/0x600 [ 245.471086][ C0] hrtimer_interrupt+0x22a/0x480 [ 245.476011][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 245.481453][ C0] apic_timer_interrupt+0xf/0x20 [ 245.486379][ C0] [ 245.488784][ C0] read to 0xffffffff86040b18 of 8 bytes by interrupt on cpu 0: [ 245.496319][ C0] ktime_get+0xcd/0x210 [ 245.500460][ C0] tcp_mstamp_refresh+0x1d/0x70 [ 245.505310][ C0] tcp_rcv_established+0x7c/0xf50 [ 245.510325][ C0] tcp_v4_do_rcv+0x381/0x4e0 [ 245.514903][ C0] tcp_v4_rcv+0x19dc/0x1bb0 [ 245.519395][ C0] ip_protocol_deliver_rcu+0x4d/0x420 [ 245.524753][ C0] ip_local_deliver_finish+0x110/0x140 [ 245.530209][ C0] ip_local_deliver+0x133/0x210 [ 245.535077][ C0] ip_rcv_finish+0x121/0x160 [ 245.539650][ C0] ip_rcv+0x18f/0x1a0 [ 245.543618][ C0] __netif_receive_skb_one_core+0xa7/0xe0 [ 245.549319][ C0] __netif_receive_skb+0x37/0xf0 [ 245.554241][ C0] netif_receive_skb_internal+0x59/0x190 [ 245.559989][ C0] [ 245.562651][ C0] Reported by Kernel Concurrency Sanitizer on: [ 245.568799][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.4.0-rc3+ #0 [ 245.576067][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 245.586371][ C0] ================================================================== [ 245.594511][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 245.601142][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.4.0-rc3+ #0 [ 245.608404][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 245.618438][ C0] Call Trace: [ 245.621731][ C0] dump_stack+0xf5/0x159 [ 245.625976][ C0] panic+0x210/0x640 [ 245.629856][ C0] ? ip_rcv_finish+0x121/0x160 [ 245.634605][ C0] ? vprintk_func+0x8d/0x140 [ 245.639186][ C0] kcsan_report.cold+0xc/0x10 [ 245.643865][ C0] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 245.649398][ C0] __tsan_read8+0x2c/0x30 [ 245.653712][ C0] ktime_get+0xcd/0x210 [ 245.657868][ C0] tcp_mstamp_refresh+0x1d/0x70 [ 245.662719][ C0] tcp_rcv_established+0x7c/0xf50 [ 245.668521][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 245.674396][ C0] ? __tsan_read4+0x2c/0x30 [ 245.678884][ C0] ? ipv4_dst_check+0xc6/0xf0 [ 245.683549][ C0] tcp_v4_do_rcv+0x381/0x4e0 [ 245.688127][ C0] tcp_v4_rcv+0x19dc/0x1bb0 [ 245.692626][ C0] ? __tsan_read8+0x2c/0x30 [ 245.697126][ C0] ip_protocol_deliver_rcu+0x4d/0x420 [ 245.702487][ C0] ip_local_deliver_finish+0x110/0x140 [ 245.707933][ C0] ip_local_deliver+0x133/0x210 [ 245.712772][ C0] ? ip_protocol_deliver_rcu+0x420/0x420 [ 245.718403][ C0] ip_rcv_finish+0x121/0x160 [ 245.722977][ C0] ip_rcv+0x18f/0x1a0 [ 245.726944][ C0] ? ip_sublist_rcv+0x5e0/0x5e0 [ 245.731792][ C0] ? ip_local_deliver+0x210/0x210 [ 245.736807][ C0] __netif_receive_skb_one_core+0xa7/0xe0 [ 245.742514][ C0] __netif_receive_skb+0x37/0xf0 [ 245.748405][ C0] netif_receive_skb_internal+0x59/0x190 [ 245.754035][ C0] napi_gro_receive+0x28f/0x330 [ 245.758872][ C0] receive_buf+0x284/0x30b0 [ 245.763363][ C0] ? __tsan_write8+0x32/0x40 [ 245.767958][ C0] ? virtqueue_get_buf_ctx+0x4fd/0x5c0 [ 245.773401][ C0] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 245.779027][ C0] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 245.784649][ C0] virtnet_poll+0x436/0x7d0 [ 245.789139][ C0] ? __sanitizer_cov_trace_cmp2+0x18/0x20 [ 245.794851][ C0] net_rx_action+0x3ae/0xa90 [ 245.799435][ C0] __do_softirq+0x115/0x33f [ 245.803936][ C0] ? takeover_tasklets+0x250/0x250 [ 245.809054][ C0] run_ksoftirqd+0x46/0x60 [ 245.813456][ C0] smpboot_thread_fn+0x37d/0x4a0 [ 245.818385][ C0] kthread+0x1d4/0x200 [ 245.822463][ C0] ? constant_test_bit.constprop.0+0x30/0x30 [ 245.828428][ C0] ? kthread_stop+0x2d0/0x2d0 [ 245.833785][ C0] ret_from_fork+0x1f/0x30 [ 245.839394][ C0] Kernel Offset: disabled [ 245.843767][ C0] Rebooting in 86400 seconds..