[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 52.870923][ T25] audit: type=1800 audit(1572882490.409:25): pid=7942 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 52.913731][ T25] audit: type=1800 audit(1572882490.409:26): pid=7942 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 52.948522][ T25] audit: type=1800 audit(1572882490.409:27): pid=7942 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 '10.128.0.56' (ECDSA) to the list of known hosts. 2019/11/04 15:48:20 fuzzer started 2019/11/04 15:48:21 dialing manager at 10.128.0.105:42499 2019/11/04 15:48:24 syscalls: 2553 2019/11/04 15:48:24 code coverage: enabled 2019/11/04 15:48:24 comparison tracing: enabled 2019/11/04 15:48:24 extra coverage: extra coverage is not supported by the kernel 2019/11/04 15:48:24 setuid sandbox: enabled 2019/11/04 15:48:24 namespace sandbox: enabled 2019/11/04 15:48:24 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/04 15:48:24 fault injection: enabled 2019/11/04 15:48:24 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/04 15:48:24 net packet injection: enabled 2019/11/04 15:48:24 net device setup: enabled 2019/11/04 15:48:24 concurrency sanitizer: enabled 2019/11/04 15:48:24 devlink PCI setup: PCI device 0000:00:10.0 is not available syzkaller login: [ 69.602093][ T8109] KCSAN: could not find function: 'poll_schedule_timeout' 2019/11/04 15:48:32 adding functions to KCSAN blacklist: 'ext4_has_free_clusters' 'pid_update_inode' 'do_wait' '__skb_try_recv_from_queue' 'do_nanosleep' '__ext4_new_inode' 'tcp_add_backlog' 'poll_schedule_timeout' 'sctp_assoc_migrate' 'ktime_get_real_seconds' 'ktime_get_seconds' 'get_task_cred' 'mem_cgroup_select_victim_node' 'snd_ctl_notify' 'hrtimer_wakeup' 'tomoyo_supervisor' '__hrtimer_run_queues' 'rcu_gp_fqs_check_wake' 'pipe_poll' 'rcu_gp_fqs_loop' 'dd_has_work' 'find_next_bit' 'run_timer_softirq' 'kauditd_thread' 'audit_log_start' 'xas_find_marked' 'blk_mq_sched_dispatch_requests' 'blk_mq_get_request' 'vm_area_dup' 'mod_timer' 'copy_process' 'generic_permission' 'p9_poll_workfn' 'task_dump_owner' 'taskstats_exit' 'do_exit' 'add_timer' 'find_get_pages_range_tag' 'generic_write_end' 'ext4_nonda_switch' 'tick_sched_do_timer' 'inet_putpeer' 'ep_poll' 'ext4_free_inode' 'page_counter_try_charge' 'wbt_issue' 'tick_do_update_jiffies64' [ 139.238859][ T0] ================================================================== [ 139.247165][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_idle_stop_tick [ 139.256298][ T0] [ 139.258748][ T0] write to 0xffffffff85cb26d0 of 4 bytes by task 0 on cpu 1: [ 139.266122][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 139.271693][ T0] do_idle+0x1a5/0x280 [ 139.275748][ T0] cpu_startup_entry+0x1b/0x20 [ 139.280498][ T0] start_secondary+0x208/0x260 [ 139.285246][ T0] secondary_startup_64+0xa4/0xb0 [ 139.290262][ T0] [ 139.292659][ T0] read to 0xffffffff85cb26d0 of 4 bytes by task 0 on cpu 0: [ 139.299947][ T0] tick_nohz_idle_stop_tick+0x193/0x670 [ 139.305480][ T0] do_idle+0x1a5/0x280 [ 139.309532][ T0] cpu_startup_entry+0x1b/0x20 [ 139.314287][ T0] rest_init+0xec/0xf6 [ 139.318363][ T0] arch_call_rest_init+0x17/0x37 [ 139.323281][ T0] start_kernel+0x838/0x85e [ 139.327774][ T0] x86_64_start_reservations+0x29/0x2b [ 139.333234][ T0] x86_64_start_kernel+0x72/0x76 [ 139.338172][ T0] secondary_startup_64+0xa4/0xb0 [ 139.343179][ T0] [ 139.345496][ T0] Reported by Kernel Concurrency Sanitizer on: [ 139.351643][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc6+ #0 [ 139.358729][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 139.368763][ T0] ================================================================== [ 139.377002][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 139.383860][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc6+ #0 [ 139.390951][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 139.400988][ T0] Call Trace: [ 139.404271][ T0] dump_stack+0xf5/0x159 [ 139.408502][ T0] panic+0x210/0x640 [ 139.412384][ T0] ? vprintk_func+0x8d/0x140 [ 139.416960][ T0] kcsan_report.cold+0xc/0xe [ 139.421545][ T0] kcsan_setup_watchpoint+0x3fe/0x410 [ 139.427058][ T0] __tsan_read4+0x145/0x1f0 [ 139.431576][ T0] tick_nohz_idle_stop_tick+0x193/0x670 [ 139.437128][ T0] ? debug_smp_processor_id+0x4c/0x172 [ 139.442682][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 139.448911][ T0] do_idle+0x1a5/0x280 [ 139.452970][ T0] cpu_startup_entry+0x1b/0x20 [ 139.457737][ T0] rest_init+0xec/0xf6 [ 139.461796][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 139.468978][ T0] arch_call_rest_init+0x17/0x37 [ 139.473898][ T0] start_kernel+0x838/0x85e [ 139.478400][ T0] x86_64_start_reservations+0x29/0x2b [ 139.483844][ T0] x86_64_start_kernel+0x72/0x76 [ 139.488767][ T0] secondary_startup_64+0xa4/0xb0 [ 139.495208][ T0] Kernel Offset: disabled [ 139.499537][ T0] Rebooting in 86400 seconds..