[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[   36.309358][   T26] audit: type=1800 audit(1572322579.834:25): pid=7099 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[   36.351986][   T26] audit: type=1800 audit(1572322579.834:26): pid=7099 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0
[   36.378166][   T26] audit: type=1800 audit(1572322579.834:27): pid=7099 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 '10.128.10.25' (ECDSA) to the list of known hosts.
2019/10/29 04:16:31 fuzzer started
2019/10/29 04:16:33 dialing manager at 10.128.0.105:40771
2019/10/29 04:16:33 syscalls: 2540
2019/10/29 04:16:33 code coverage: enabled
2019/10/29 04:16:33 comparison tracing: enabled
2019/10/29 04:16:33 extra coverage: extra coverage is not supported by the kernel
2019/10/29 04:16:33 setuid sandbox: enabled
2019/10/29 04:16:33 namespace sandbox: enabled
2019/10/29 04:16:33 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/29 04:16:33 fault injection: enabled
2019/10/29 04:16:33 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/29 04:16:33 net packet injection: enabled
2019/10/29 04:16:33 net device setup: enabled
2019/10/29 04:16:33 concurrency sanitizer: enabled
2019/10/29 04:16:37 adding functions to KCSAN blacklist: 'pid_update_inode' 'alloc_pid' 'generic_permission' 'do_nanosleep' '__hrtimer_run_queues' 'tomoyo_supervisor' 'ep_poll' 'tcp_poll' 'do_exit' '__nf_conntrack_find_get' 'tcp_add_backlog' 'page_counter_try_charge' 'task_dump_owner' '__nf_ct_refresh_acct' 'ktime_get_real_seconds' 'find_next_bit' 
syzkaller login: [   57.126105][    T0] ==================================================================
[   57.134374][    T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_next_event
[   57.142936][    T0] 
[   57.145271][    T0] write to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 1:
[   57.152713][    T0]  tick_nohz_idle_stop_tick+0x525/0x670
[   57.158239][    T0]  do_idle+0x1a5/0x280
[   57.162289][    T0]  cpu_startup_entry+0x1b/0x20
[   57.167058][    T0]  start_secondary+0x208/0x260
[   57.171917][    T0]  secondary_startup_64+0xa4/0xb0
[   57.177006][    T0] 
[   57.179673][    T0] read to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 0:
[   57.187276][    T0]  tick_nohz_next_event+0x1a4/0x380
[   57.192460][    T0]  tick_nohz_idle_stop_tick+0x3c2/0x670
[   57.198414][    T0]  do_idle+0x1a5/0x280
[   57.202473][    T0]  cpu_startup_entry+0x1b/0x20
[   57.207216][    T0]  rest_init+0xec/0xf6
[   57.211607][    T0]  arch_call_rest_init+0x17/0x37
[   57.216538][    T0]  start_kernel+0x838/0x85e
[   57.221110][    T0]  x86_64_start_reservations+0x29/0x2b
[   57.226549][    T0]  x86_64_start_kernel+0x72/0x76
[   57.231652][    T0]  secondary_startup_64+0xa4/0xb0
[   57.237009][    T0] 
[   57.239453][    T0] Reported by Kernel Concurrency Sanitizer on:
[   57.245696][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0
[   57.252957][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   57.265702][    T0] ==================================================================
[   57.273860][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   57.280429][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0
[   57.287785][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   57.297924][    T0] Call Trace:
[   57.301320][    T0]  dump_stack+0xf5/0x159
[   57.305556][    T0]  panic+0x210/0x640
[   57.309637][    T0]  ? x86_64_start_kernel+0x72/0x76
[   57.314904][    T0]  ? vprintk_func+0x8d/0x140
[   57.319488][    T0]  kcsan_report.cold+0xc/0x10
[   57.324157][    T0]  __kcsan_setup_watchpoint+0x32e/0x4a0
[   57.331038][    T0]  __tsan_read4+0x2c/0x30
[   57.335452][    T0]  tick_nohz_next_event+0x1a4/0x380
[   57.340643][    T0]  tick_nohz_idle_stop_tick+0x3c2/0x670
[   57.346277][    T0]  ? __tsan_read4+0x2c/0x30
[   57.351726][    T0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   57.358650][    T0]  do_idle+0x1a5/0x280
[   57.362806][    T0]  cpu_startup_entry+0x1b/0x20
[   57.367645][    T0]  rest_init+0xec/0xf6
[   57.371721][    T0]  ? trace_event_define_fields_vector_free_moved+0xce/0xce
[   57.379536][    T0]  arch_call_rest_init+0x17/0x37
[   57.384657][    T0]  start_kernel+0x838/0x85e
[   57.389164][    T0]  x86_64_start_reservations+0x29/0x2b
[   57.394608][    T0]  x86_64_start_kernel+0x72/0x76
[   57.399553][    T0]  secondary_startup_64+0xa4/0xb0
[   57.406787][    T0] Kernel Offset: disabled
[   57.411413][    T0] Rebooting in 86400 seconds..