[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.808506][ T25] audit: type=1800 audit(1572768643.052:25): pid=7114 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.843482][ T25] audit: type=1800 audit(1572768643.062:26): pid=7114 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.877948][ T25] audit: type=1800 audit(1572768643.062:27): pid=7114 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 '10.128.0.8' (ECDSA) to the list of known hosts. 2019/11/03 08:10:55 fuzzer started 2019/11/03 08:10:57 dialing manager at 10.128.0.105:46001 2019/11/03 08:10:57 syscalls: 2554 2019/11/03 08:10:57 code coverage: enabled 2019/11/03 08:10:57 comparison tracing: enabled 2019/11/03 08:10:57 extra coverage: extra coverage is not supported by the kernel 2019/11/03 08:10:57 setuid sandbox: enabled 2019/11/03 08:10:57 namespace sandbox: enabled 2019/11/03 08:10:57 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/03 08:10:57 fault injection: enabled 2019/11/03 08:10:57 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/03 08:10:57 net packet injection: enabled 2019/11/03 08:10:57 net device setup: enabled 2019/11/03 08:10:57 concurrency sanitizer: enabled syzkaller login: [ 66.418675][ T7279] KCSAN: could not find function: 'poll_schedule_timeout' 2019/11/03 08:11:23 adding functions to KCSAN blacklist: 'tomoyo_supervisor' '__rcu_read_unlock' '__tcp_select_window' 'do_exit' 'skb_queue_tail' 'icmp_global_allow' 'pipe_wait' 'ext4_nonda_switch' 'timer_clear_idle' '__wb_calc_thresh' '__nf_ct_refresh_acct' 'commit_echoes' 'mod_timer' 'generic_write_end' '__ext4_new_inode' 'ktime_get_seconds' 'kvm_arch_vcpu_load' '__dev_queue_xmit' 'audit_log_start' 'install_new_memslots' 'ptrace_check_attach' 'tick_sched_do_timer' 'ext4_mark_iloc_dirty' '__blk_queue_split' 'snapshot_refaults' 'do_sendfile' 'pipe_poll' 'enqueue_timer' 'osq_lock' 'mem_cgroup_select_victim_node' 'ext4_setattr' '__skb_try_recv_from_queue' 'ep_poll' 'wbc_attach_and_unlock_inode' 'copy_process' 'ext4_free_inode' 'p9_poll_workfn' '__delete_from_page_cache' '__dentry_kill' 'wbt_issue' 'shmem_file_read_iter' 'rcu_gp_fqs_check_wake' 'tcp_add_backlog' 'search_nested_keyrings' 'packet_do_bind' 'ext4_has_free_clusters' 'find_get_pages_range_tag' 'echo_char' 'ext4_mb_good_group' 'yama_ptracer_del' '__hrtimer_run_queues' 'tcp_poll' 'queue_access_lock' 'tcp_event_new_data_sent' 'atime_needs_update' 'pid_update_inode' 'list_lru_count_one' 'ext4_xattr_get' 'alloc_pid' 'task_dump_owner' 'tick_do_update_jiffies64' 'dd_has_work' 'ktime_get_with_offset' 'blk_mq_dispatch_rq_list' 'n_tty_receive_buf_common' 'xas_find_marked' 'ext4_free_inodes_count' 'wbt_done' 'snd_ctl_notify' '__process_echoes' 'taskstats_exit' 'generic_permission' 'bio_chain' 'poll_schedule_timeout' 'rcu_gp_fqs_loop' 'blk_mq_get_request' '__snd_rawmidi_transmit_ack' 'dput' '__add_to_page_cache_locked' 'udp_set_dev_scratch' 'find_next_bit' 'sit_tunnel_xmit' 'kauditd_thread' 'generic_fillattr' 'wbc_detach_inode' 'do_nanosleep' 'blk_mq_sched_dispatch_requests' '__alloc_file' 'inode_permission' 'run_timer_softirq' 'add_timer' 'ktime_get_real_seconds' 'shmem_getpage_gfp' 'ipip_tunnel_xmit' '__mark_inode_dirty' '__perf_event_overflow' 'snd_seq_prioq_cell_out' 'pcpu_alloc' 'exit_signals' 'fsnotify' 'lru_add_drain_all' 'handle_mm_fault' 'inet_putpeer' 'blk_mq_run_hw_queue' 'inactive_list_is_low' 'lookup_fast' 'rcvbuf_limit' 'pipe_unlock' 'shmem_add_to_page_cache' '__nf_conntrack_find_get' 'kernfs_refresh_inode' 'tick_nohz_idle_stop_tick' 'xas_clear_mark' 'do_syslog' 'kvm_mmu_notifier_invalidate_range_end' 'process_srcu' 'vm_area_dup' 'kcm_rfree' 'page_counter_try_charge' 'add_timer_on' 'update_defense_level' '__skb_wait_for_more_packets' 'snd_seq_timer_get_cur_tick' 'evict' 'mm_update_next_owner' [ 79.189513][ C0] ================================================================== [ 79.197734][ C0] BUG: KCSAN: data-race in ktime_get / timekeeping_advance [ 79.204902][ C0] [ 79.207216][ C0] write to 0xffffffff86040b08 of 280 bytes by interrupt on cpu 1: [ 79.215001][ C0] timekeeping_advance+0x893/0xd80 [ 79.220093][ C0] update_wall_time+0x19/0x20 [ 79.224754][ C0] tick_do_update_jiffies64+0x1ae/0x260 [ 79.230282][ C0] tick_sched_do_timer+0xd4/0xe0 [ 79.235203][ C0] tick_sched_timer+0x43/0xe0 [ 79.239859][ C0] __hrtimer_run_queues+0x288/0x600 [ 79.245037][ C0] hrtimer_interrupt+0x22a/0x480 [ 79.249956][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 79.255395][ C0] apic_timer_interrupt+0xf/0x20 [ 79.260343][ C0] __kcsan_setup_watchpoint+0x268/0x4a0 [ 79.265869][ C0] __tsan_read8+0x2c/0x30 [ 79.270181][ C0] __fget+0x87/0x1d0 [ 79.274058][ C0] __fget_light+0x94/0x190 [ 79.278465][ C0] __fdget_pos+0x3a/0x100 [ 79.282766][ C0] [ 79.285081][ C0] read to 0xffffffff86040b20 of 4 bytes by interrupt on cpu 0: [ 79.292605][ C0] ktime_get+0x107/0x210 [ 79.296826][ C0] tcp_mstamp_refresh+0x1d/0x70 [ 79.301660][ C0] tcp_rcv_established+0x7c/0xf50 [ 79.306667][ C0] tcp_v4_do_rcv+0x381/0x4e0 [ 79.311239][ C0] tcp_v4_rcv+0x19dc/0x1bb0 [ 79.315720][ C0] ip_protocol_deliver_rcu+0x4d/0x420 [ 79.321072][ C0] ip_local_deliver_finish+0x110/0x140 [ 79.326509][ C0] ip_local_deliver+0x133/0x210 [ 79.331340][ C0] ip_rcv_finish+0x121/0x160 [ 79.335908][ C0] ip_rcv+0x18f/0x1a0 [ 79.339874][ C0] __netif_receive_skb_one_core+0xa7/0xe0 [ 79.345576][ C0] __netif_receive_skb+0x37/0xf0 [ 79.350497][ C0] netif_receive_skb_internal+0x59/0x190 [ 79.356100][ C0] [ 79.358407][ C0] Reported by Kernel Concurrency Sanitizer on: [ 79.364545][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.4.0-rc3+ #0 [ 79.371813][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 79.381849][ C0] ================================================================== [ 79.389890][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 79.396458][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.4.0-rc3+ #0 [ 79.403724][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 79.413757][ C0] Call Trace: [ 79.417032][ C0] dump_stack+0xf5/0x159 [ 79.421258][ C0] panic+0x210/0x640 [ 79.425136][ C0] ? ip_rcv_finish+0x121/0x160 [ 79.429894][ C0] ? vprintk_func+0x8d/0x140 [ 79.434467][ C0] kcsan_report.cold+0xc/0x10 [ 79.439136][ C0] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 79.444667][ C0] __tsan_read4+0x2c/0x30 [ 79.448980][ C0] ktime_get+0x107/0x210 [ 79.453209][ C0] tcp_mstamp_refresh+0x1d/0x70 [ 79.458049][ C0] tcp_rcv_established+0x7c/0xf50 [ 79.463057][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 79.468933][ C0] ? __tsan_read4+0x2c/0x30 [ 79.473436][ C0] ? ipv4_dst_check+0xc6/0xf0 [ 79.478099][ C0] tcp_v4_do_rcv+0x381/0x4e0 [ 79.482673][ C0] tcp_v4_rcv+0x19dc/0x1bb0 [ 79.487158][ C0] ? __tsan_read8+0x2c/0x30 [ 79.491652][ C0] ip_protocol_deliver_rcu+0x4d/0x420 [ 79.497010][ C0] ip_local_deliver_finish+0x110/0x140 [ 79.502452][ C0] ip_local_deliver+0x133/0x210 [ 79.507286][ C0] ? ip_protocol_deliver_rcu+0x420/0x420 [ 79.512903][ C0] ip_rcv_finish+0x121/0x160 [ 79.517479][ C0] ip_rcv+0x18f/0x1a0 [ 79.521442][ C0] ? ip_sublist_rcv+0x5e0/0x5e0 [ 79.526278][ C0] ? ip_local_deliver+0x210/0x210 [ 79.531286][ C0] __netif_receive_skb_one_core+0xa7/0xe0 [ 79.536989][ C0] __netif_receive_skb+0x37/0xf0 [ 79.541911][ C0] netif_receive_skb_internal+0x59/0x190 [ 79.547529][ C0] napi_gro_receive+0x28f/0x330 [ 79.552363][ C0] receive_buf+0x284/0x30b0 [ 79.556852][ C0] ? __tsan_write8+0x32/0x40 [ 79.561434][ C0] ? virtqueue_get_buf_ctx+0x4fd/0x5c0 [ 79.566874][ C0] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 79.572488][ C0] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 79.578104][ C0] virtnet_poll+0x436/0x7d0 [ 79.582596][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 79.588824][ C0] net_rx_action+0x3ae/0xa90 [ 79.593410][ C0] __do_softirq+0x115/0x33f [ 79.597904][ C0] ? takeover_tasklets+0x250/0x250 [ 79.602997][ C0] run_ksoftirqd+0x46/0x60 [ 79.607402][ C0] smpboot_thread_fn+0x37d/0x4a0 [ 79.612326][ C0] kthread+0x1d4/0x200 [ 79.616379][ C0] ? constant_test_bit.constprop.0+0x30/0x30 [ 79.622342][ C0] ? kthread_stop+0x2d0/0x2d0 [ 79.627000][ C0] ret_from_fork+0x1f/0x30 [ 79.632793][ C0] Kernel Offset: disabled [ 79.637111][ C0] Rebooting in 86400 seconds..