[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[   34.779633][   T26] audit: type=1800 audit(1571718056.350:25): pid=7032 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[   34.806773][   T26] audit: type=1800 audit(1571718056.360:26): pid=7032 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0
[   34.837833][   T26] audit: type=1800 audit(1571718056.360:27): pid=7032 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 '10.128.0.243' (ECDSA) to the list of known hosts.
2019/10/22 04:21:04 fuzzer started
2019/10/22 04:21:06 dialing manager at 10.128.0.105:37053
2019/10/22 04:21:06 syscalls: 2524
2019/10/22 04:21:06 code coverage: enabled
2019/10/22 04:21:06 comparison tracing: enabled
2019/10/22 04:21:06 extra coverage: extra coverage is not supported by the kernel
2019/10/22 04:21:06 setuid sandbox: enabled
2019/10/22 04:21:06 namespace sandbox: enabled
2019/10/22 04:21:06 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/22 04:21:06 fault injection: enabled
2019/10/22 04:21:06 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/22 04:21:06 net packet injection: enabled
2019/10/22 04:21:06 net device setup: enabled
2019/10/22 04:21:06 concurrency sanitizer: enabled
syzkaller login: [   44.671135][    T0] ==================================================================
[   44.679277][    T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_do_timer
[   44.687427][    T0] 
[   44.689751][    T0] write to 0xffffffff85cb2790 of 4 bytes by interrupt on cpu 0:
[   44.697369][    T0]  tick_sched_do_timer+0xc0/0xe0
[   44.702410][    T0]  tick_sched_timer+0x43/0xe0
[   44.707116][    T0]  __hrtimer_run_queues+0x288/0x600
[   44.712313][    T0]  hrtimer_interrupt+0x22a/0x480
[   44.717247][    T0]  smp_apic_timer_interrupt+0xdc/0x280
[   44.722807][    T0]  apic_timer_interrupt+0xf/0x20
[   44.727729][    T0] 
[   44.730039][    T0] read to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 1:
[   44.737308][    T0]  tick_nohz_next_event+0x1a4/0x380
[   44.742504][    T0]  tick_nohz_idle_stop_tick+0x3c2/0x670
[   44.748383][    T0]  do_idle+0x1a5/0x280
[   44.752432][    T0]  cpu_startup_entry+0x1b/0x20
[   44.757185][    T0]  start_secondary+0x208/0x260
[   44.761929][    T0]  secondary_startup_64+0xa4/0xb0
[   44.766921][    T0] 
[   44.769235][    T0] Reported by Kernel Concurrency Sanitizer on:
[   44.775373][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0
[   44.782808][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   44.792860][    T0] ==================================================================
[   44.800905][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   44.807481][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0
[   44.814575][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   44.824607][    T0] Call Trace:
[   44.827945][    T0]  dump_stack+0xf5/0x159
[   44.832191][    T0]  panic+0x210/0x640
[   44.836085][    T0]  ? vprintk_func+0x8d/0x140
[   44.840687][    T0]  kcsan_report.cold+0xc/0x10
[   44.845369][    T0]  __kcsan_setup_watchpoint+0x32e/0x4a0
[   44.850907][    T0]  __tsan_read4+0x2c/0x30
[   44.855228][    T0]  tick_nohz_next_event+0x1a4/0x380
[   44.860415][    T0]  tick_nohz_idle_stop_tick+0x3c2/0x670
[   44.865951][    T0]  ? __tsan_read4+0x2c/0x30
[   44.870456][    T0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   44.876698][    T0]  do_idle+0x1a5/0x280
[   44.880758][    T0]  ? complete+0x44/0x50
[   44.884911][    T0]  cpu_startup_entry+0x1b/0x20
[   44.889670][    T0]  start_secondary+0x208/0x260
[   44.894436][    T0]  secondary_startup_64+0xa4/0xb0
[   44.900901][    T0] Kernel Offset: disabled
[   44.905220][    T0] Rebooting in 86400 seconds..