[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[   38.312877][   T25] audit: type=1800 audit(1570765210.565:25): pid=7081 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[   38.355567][   T25] audit: type=1800 audit(1570765210.565:26): pid=7081 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0
[   38.376569][   T25] audit: type=1800 audit(1570765210.565:27): pid=7081 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 '10.128.15.192' (ECDSA) to the list of known hosts.
2019/10/11 03:40:17 fuzzer started
2019/10/11 03:40:19 dialing manager at 10.128.0.105:37331
2019/10/11 03:40:19 syscalls: 2523
2019/10/11 03:40:19 code coverage: enabled
2019/10/11 03:40:19 comparison tracing: enabled
2019/10/11 03:40:19 extra coverage: extra coverage is not supported by the kernel
2019/10/11 03:40:19 setuid sandbox: enabled
2019/10/11 03:40:19 namespace sandbox: enabled
2019/10/11 03:40:19 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/11 03:40:19 fault injection: enabled
2019/10/11 03:40:19 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/11 03:40:19 net packet injection: enabled
2019/10/11 03:40:19 net device setup: enabled
2019/10/11 03:40:19 concurrency sanitizer: enabled
syzkaller login: [   47.417773][    T0] ==================================================================
[   47.425945][    T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_idle_stop_tick
[   47.434868][    T0] 
[   47.437198][    T0] write to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 1:
[   47.445624][    T0]  tick_nohz_idle_stop_tick+0x525/0x670
[   47.451150][    T0]  do_idle+0x1e0/0x2c0
[   47.455193][    T0]  cpu_startup_entry+0x1b/0x20
[   47.459945][    T0]  start_secondary+0x207/0x260
[   47.464696][    T0]  secondary_startup_64+0xa4/0xb0
[   47.469692][    T0] 
[   47.472163][    T0] read to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 0:
[   47.479446][    T0]  tick_nohz_idle_stop_tick+0x193/0x670
[   47.485070][    T0]  do_idle+0x1e0/0x2c0
[   47.489117][    T0]  cpu_startup_entry+0x1b/0x20
[   47.493862][    T0]  rest_init+0xec/0xf6
[   47.497919][    T0]  arch_call_rest_init+0x17/0x37
[   47.502842][    T0]  start_kernel+0x83e/0x864
[   47.507333][    T0]  x86_64_start_reservations+0x29/0x2b
[   47.512780][    T0]  x86_64_start_kernel+0x72/0x76
[   47.517700][    T0]  secondary_startup_64+0xa4/0xb0
[   47.522695][    T0] 
[   47.524994][    T0] Reported by Kernel Concurrency Sanitizer on:
[   47.531187][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0
[   47.537939][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   47.547969][    T0] ==================================================================
[   47.556020][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   47.562585][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0
[   47.569327][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   47.579368][    T0] Call Trace:
[   47.582639][    T0]  dump_stack+0xf5/0x159
[   47.586876][    T0]  panic+0x209/0x639
[   47.590751][    T0]  ? secondary_startup_64+0xa4/0xb0
[   47.595925][    T0]  ? vprintk_func+0x8d/0x140
[   47.600536][    T0]  kcsan_report.cold+0xc/0x1b
[   47.605190][    T0]  __kcsan_setup_watchpoint+0x3ee/0x510
[   47.610713][    T0]  __tsan_read4+0x2c/0x30
[   47.615021][    T0]  tick_nohz_idle_stop_tick+0x193/0x670
[   47.620559][    T0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   47.626963][    T0]  do_idle+0x1e0/0x2c0
[   47.631008][    T0]  ? do_idle+0xe6/0x2c0
[   47.635142][    T0]  cpu_startup_entry+0x1b/0x20
[   47.639883][    T0]  rest_init+0xec/0xf6
[   47.644192][    T0]  ? trace_event_define_fields_vector_free_moved+0xce/0xce
[   47.651366][    T0]  arch_call_rest_init+0x17/0x37
[   47.656281][    T0]  start_kernel+0x83e/0x864
[   47.660767][    T0]  x86_64_start_reservations+0x29/0x2b
[   47.666202][    T0]  x86_64_start_kernel+0x72/0x76
[   47.671136][    T0]  secondary_startup_64+0xa4/0xb0
[   47.677364][    T0] Kernel Offset: disabled
[   47.681689][    T0] Rebooting in 86400 seconds..