[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[   34.840837][   T26] audit: type=1800 audit(1571202316.757:25): pid=7075 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[   34.869566][   T26] audit: type=1800 audit(1571202316.757:26): pid=7075 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0
[   34.896631][   T26] audit: type=1800 audit(1571202316.757:27): pid=7075 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 '10.128.0.16' (ECDSA) to the list of known hosts.
2019/10/16 05:05:29 fuzzer started
2019/10/16 05:05:31 dialing manager at 10.128.0.105:34737
2019/10/16 05:05:31 syscalls: 2524
2019/10/16 05:05:31 code coverage: enabled
2019/10/16 05:05:31 comparison tracing: enabled
2019/10/16 05:05:31 extra coverage: extra coverage is not supported by the kernel
2019/10/16 05:05:31 setuid sandbox: enabled
2019/10/16 05:05:31 namespace sandbox: enabled
2019/10/16 05:05:31 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/16 05:05:31 fault injection: enabled
2019/10/16 05:05:31 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/16 05:05:31 net packet injection: enabled
2019/10/16 05:05:31 net device setup: enabled
2019/10/16 05:05:31 concurrency sanitizer: enabled
syzkaller login: [   49.528979][    T0] ==================================================================
[   49.537743][    T0] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64
[   49.550250][    T0] 
[   49.552596][    T0] write to 0xffffffff86042008 of 8 bytes by interrupt on cpu 0:
[   49.560240][    T0]  tick_do_update_jiffies64+0x105/0x260
[   49.565797][    T0]  tick_sched_do_timer+0xd4/0xe0
[   49.570733][    T0]  tick_sched_timer+0x43/0xe0
[   49.576354][    T0]  __hrtimer_run_queues+0x288/0x600
[   49.581755][    T0]  hrtimer_interrupt+0x22a/0x480
[   49.587615][    T0]  smp_apic_timer_interrupt+0xdc/0x280
[   49.593060][    T0]  apic_timer_interrupt+0xf/0x20
[   49.597968][    T0] 
[   49.600337][    T0] read to 0xffffffff86042008 of 8 bytes by task 0 on cpu 1:
[   49.607611][    T0]  tick_do_update_jiffies64+0x2b/0x260
[   49.613054][    T0]  __tick_nohz_idle_restart_tick+0x31/0x1b0
[   49.618939][    T0]  tick_nohz_idle_exit+0x1af/0x1e0
[   49.624044][    T0]  do_idle+0xb1/0x280
[   49.628007][    T0]  cpu_startup_entry+0x1b/0x20
[   49.632753][    T0]  start_secondary+0x208/0x260
[   49.637510][    T0]  secondary_startup_64+0xa4/0xb0
[   49.642504][    T0] 
[   49.644811][    T0] Reported by Kernel Concurrency Sanitizer on:
[   49.650956][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0
[   49.658037][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   49.668072][    T0] ==================================================================
[   49.676124][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   49.682734][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0
[   49.689827][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   49.699867][    T0] Call Trace:
[   49.703147][    T0]  dump_stack+0xf5/0x159
[   49.707383][    T0]  panic+0x210/0x640
[   49.711330][    T0]  ? vprintk_func+0x8d/0x140
[   49.715993][    T0]  kcsan_report.cold+0xc/0x1b
[   49.720685][    T0]  __kcsan_setup_watchpoint+0x3ee/0x510
[   49.726218][    T0]  __tsan_read8+0x2c/0x30
[   49.730546][    T0]  tick_do_update_jiffies64+0x2b/0x260
[   49.736013][    T0]  __tick_nohz_idle_restart_tick+0x31/0x1b0
[   49.742019][    T0]  tick_nohz_idle_exit+0x1af/0x1e0
[   49.747143][    T0]  do_idle+0xb1/0x280
[   49.751116][    T0]  cpu_startup_entry+0x1b/0x20
[   49.755874][    T0]  start_secondary+0x208/0x260
[   49.760631][    T0]  secondary_startup_64+0xa4/0xb0
[   49.766483][    T0] Kernel Offset: disabled
[   49.770987][    T0] Rebooting in 86400 seconds..