[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[   34.943769][   T26] audit: type=1800 audit(1572869781.119:25): pid=7058 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[   34.970823][   T26] audit: type=1800 audit(1572869781.119:26): pid=7058 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0
[   35.001548][   T26] audit: type=1800 audit(1572869781.119:27): pid=7058 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 '10.128.10.29' (ECDSA) to the list of known hosts.
2019/11/04 12:16:30 fuzzer started
2019/11/04 12:16:32 dialing manager at 10.128.0.105:43623
2019/11/04 12:16:32 syscalls: 2553
2019/11/04 12:16:32 code coverage: enabled
2019/11/04 12:16:32 comparison tracing: enabled
2019/11/04 12:16:32 extra coverage: extra coverage is not supported by the kernel
2019/11/04 12:16:32 setuid sandbox: enabled
2019/11/04 12:16:32 namespace sandbox: enabled
2019/11/04 12:16:32 Android sandbox: /sys/fs/selinux/policy does not exist
2019/11/04 12:16:32 fault injection: enabled
2019/11/04 12:16:32 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/11/04 12:16:32 net packet injection: enabled
2019/11/04 12:16:32 net device setup: enabled
2019/11/04 12:16:32 concurrency sanitizer: enabled
2019/11/04 12:16:32 devlink PCI setup: PCI device 0000:00:10.0 is not available
2019/11/04 12:16:38 adding functions to KCSAN blacklist: 'tcp_add_backlog' 'pid_update_inode' '__nf_ct_refresh_acct' 'rcu_gp_fqs_check_wake' 'pipe_poll' 'do_nanosleep' 'tick_sched_do_timer' 'generic_fillattr' 'task_dump_owner' '__nf_conntrack_find_get' 'echo_char' 'ext4_has_free_clusters' '__ext4_new_inode' 'run_timer_softirq' '__hrtimer_run_queues' 'find_next_bit' 'ep_poll' 'ktime_get_real_seconds' 'taskstats_exit' 'tick_do_update_jiffies64' 'generic_permission' 'add_timer' 'rcu_gp_fqs_loop' 'ext4_setattr' 'tomoyo_supervisor' '__tcp_select_window' 'tcp_poll' 
syzkaller login: [   61.096403][    T0] ==================================================================
[   61.104569][    T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_idle_stop_tick
[   61.113469][    T0] 
[   61.115774][    T0] write to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 1:
[   61.123118][    T0]  tick_nohz_idle_stop_tick+0x525/0x670
[   61.128679][    T0]  do_idle+0x1a5/0x280
[   61.132724][    T0]  cpu_startup_entry+0x1b/0x20
[   61.137466][    T0]  start_secondary+0x208/0x260
[   61.142207][    T0]  secondary_startup_64+0xa4/0xb0
[   61.147198][    T0] 
[   61.149504][    T0] read to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 0:
[   61.156805][    T0]  tick_nohz_idle_stop_tick+0x193/0x670
[   61.162367][    T0]  do_idle+0x1a5/0x280
[   61.166447][    T0]  cpu_startup_entry+0x1b/0x20
[   61.171188][    T0]  rest_init+0xec/0xf6
[   61.175234][    T0]  arch_call_rest_init+0x17/0x37
[   61.180144][    T0]  start_kernel+0x838/0x85e
[   61.184668][    T0]  x86_64_start_reservations+0x29/0x2b
[   61.190101][    T0]  x86_64_start_kernel+0x72/0x76
[   61.195058][    T0]  secondary_startup_64+0xa4/0xb0
[   61.200057][    T0] 
[   61.202357][    T0] Reported by Kernel Concurrency Sanitizer on:
[   61.208496][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0
[   61.215586][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   61.225622][    T0] ==================================================================
[   61.233658][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   61.240276][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0
[   61.247394][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   61.257442][    T0] Call Trace:
[   61.260715][    T0]  dump_stack+0xf5/0x159
[   61.264946][    T0]  panic+0x210/0x640
[   61.268829][    T0]  ? secondary_startup_64+0xa4/0xb0
[   61.274013][    T0]  ? vprintk_func+0x8d/0x140
[   61.278598][    T0]  kcsan_report.cold+0xc/0x10
[   61.283263][    T0]  __kcsan_setup_watchpoint+0x32e/0x4a0
[   61.288788][    T0]  __tsan_read4+0x2c/0x30
[   61.293096][    T0]  tick_nohz_idle_stop_tick+0x193/0x670
[   61.298640][    T0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   61.304865][    T0]  do_idle+0x1a5/0x280
[   61.308915][    T0]  cpu_startup_entry+0x1b/0x20
[   61.313656][    T0]  rest_init+0xec/0xf6
[   61.317717][    T0]  ? trace_event_define_fields_vector_free_moved+0xce/0xce
[   61.324889][    T0]  arch_call_rest_init+0x17/0x37
[   61.329801][    T0]  start_kernel+0x838/0x85e
[   61.334283][    T0]  x86_64_start_reservations+0x29/0x2b
[   61.339729][    T0]  x86_64_start_kernel+0x72/0x76
[   61.344654][    T0]  secondary_startup_64+0xa4/0xb0
[   61.350773][    T0] Kernel Offset: disabled
[   61.355091][    T0] Rebooting in 86400 seconds..