[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[   33.387787][   T25] audit: type=1800 audit(1571242142.903:25): pid=7043 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[   33.438406][   T25] audit: type=1800 audit(1571242142.913:26): pid=7043 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0
[   33.465364][   T25] audit: type=1800 audit(1571242142.913:27): pid=7043 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 '10.128.1.40' (ECDSA) to the list of known hosts.
2019/10/16 16:09:15 fuzzer started
2019/10/16 16:09:16 dialing manager at 10.128.0.105:37551
2019/10/16 16:09:16 syscalls: 2524
2019/10/16 16:09:16 code coverage: enabled
2019/10/16 16:09:16 comparison tracing: enabled
2019/10/16 16:09:16 extra coverage: extra coverage is not supported by the kernel
2019/10/16 16:09:16 setuid sandbox: enabled
2019/10/16 16:09:16 namespace sandbox: enabled
2019/10/16 16:09:16 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/16 16:09:16 fault injection: enabled
2019/10/16 16:09:16 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/16 16:09:16 net packet injection: enabled
2019/10/16 16:09:16 net device setup: enabled
2019/10/16 16:09:16 concurrency sanitizer: enabled
syzkaller login: [   49.478138][    T0] ==================================================================
[   49.486381][    T0] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64
[   49.495300][    T0] 
[   49.497758][    T0] write to 0xffffffff86042008 of 8 bytes by interrupt on cpu 0:
[   49.506270][    T0]  tick_do_update_jiffies64+0x105/0x260
[   49.511818][    T0]  tick_sched_do_timer+0xd4/0xe0
[   49.516754][    T0]  tick_sched_timer+0x43/0xe0
[   49.521426][    T0]  __hrtimer_run_queues+0x288/0x600
[   49.526962][    T0]  hrtimer_interrupt+0x22a/0x480
[   49.531922][    T0]  smp_apic_timer_interrupt+0xdc/0x280
[   49.537415][    T0]  apic_timer_interrupt+0xf/0x20
[   49.542336][    T0] 
[   49.544664][    T0] read to 0xffffffff86042008 of 8 bytes by task 0 on cpu 1:
[   49.551946][    T0]  tick_do_update_jiffies64+0x2b/0x260
[   49.557498][    T0]  __tick_nohz_idle_restart_tick+0x31/0x1b0
[   49.563391][    T0]  tick_nohz_idle_exit+0x1af/0x1e0
[   49.568586][    T0]  do_idle+0xb1/0x280
[   49.572564][    T0]  cpu_startup_entry+0x1b/0x20
[   49.577322][    T0]  start_secondary+0x208/0x260
[   49.582083][    T0]  secondary_startup_64+0xa4/0xb0
[   49.587089][    T0] 
[   49.589408][    T0] Reported by Kernel Concurrency Sanitizer on:
[   49.595563][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0
[   49.602655][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   49.612722][    T0] ==================================================================
[   49.620794][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   49.627382][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0
[   49.634477][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   49.644516][    T0] Call Trace:
[   49.647814][    T0]  dump_stack+0xf5/0x159
[   49.652052][    T0]  panic+0x210/0x640
[   49.655946][    T0]  ? vprintk_func+0x8d/0x140
[   49.660540][    T0]  kcsan_report.cold+0xc/0x1b
[   49.665216][    T0]  __kcsan_setup_watchpoint+0x3ee/0x510
[   49.670759][    T0]  __tsan_read8+0x2c/0x30
[   49.675082][    T0]  tick_do_update_jiffies64+0x2b/0x260
[   49.680541][    T0]  __tick_nohz_idle_restart_tick+0x31/0x1b0
[   49.686440][    T0]  tick_nohz_idle_exit+0x1af/0x1e0
[   49.691558][    T0]  do_idle+0xb1/0x280
[   49.695542][    T0]  ? complete+0x44/0x50
[   49.699699][    T0]  cpu_startup_entry+0x1b/0x20
[   49.704460][    T0]  start_secondary+0x208/0x260
[   49.709222][    T0]  secondary_startup_64+0xa4/0xb0
[   49.715650][    T0] Kernel Offset: disabled
[   49.720006][    T0] Rebooting in 86400 seconds..