[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[   35.634087][   T25] audit: type=1800 audit(1570246601.996:25): 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
[   35.677953][   T25] audit: type=1800 audit(1570246601.996:26): 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
[   35.699850][   T25] audit: type=1800 audit(1570246601.996:27): 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 '10.128.10.1' (ECDSA) to the list of known hosts.
2019/10/05 03:36:53 fuzzer started
2019/10/05 03:36:54 dialing manager at 10.128.0.105:35709
2019/10/05 03:36:54 syscalls: 2523
2019/10/05 03:36:54 code coverage: enabled
2019/10/05 03:36:54 comparison tracing: enabled
2019/10/05 03:36:54 extra coverage: extra coverage is not supported by the kernel
2019/10/05 03:36:54 setuid sandbox: enabled
2019/10/05 03:36:54 namespace sandbox: enabled
2019/10/05 03:36:54 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/05 03:36:54 fault injection: enabled
2019/10/05 03:36:54 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/05 03:36:54 net packet injection: enabled
2019/10/05 03:36:54 net device setup: enabled
2019/10/05 03:36:54 concurrency sanitizer: enabled
syzkaller login: [   48.301285][    T0] ==================================================================
[   48.309522][    T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_idle_stop_tick
[   48.318419][    T0] 
[   48.320727][    T0] write to 0xffffffff85caf2d0 of 4 bytes by task 0 on cpu 1:
[   48.328076][    T0]  tick_nohz_idle_stop_tick+0x525/0x670
[   48.333593][    T0]  do_idle+0x1e0/0x2c0
[   48.337634][    T0]  cpu_startup_entry+0x1b/0x20
[   48.342387][    T0]  start_secondary+0x207/0x260
[   48.347147][    T0]  secondary_startup_64+0xa4/0xb0
[   48.352140][    T0] 
[   48.354443][    T0] read to 0xffffffff85caf2d0 of 4 bytes by task 0 on cpu 0:
[   48.361703][    T0]  tick_nohz_idle_stop_tick+0x193/0x670
[   48.367225][    T0]  do_idle+0x1e0/0x2c0
[   48.371267][    T0]  cpu_startup_entry+0x1b/0x20
[   48.376007][    T0]  rest_init+0xec/0xf6
[   48.380051][    T0]  arch_call_rest_init+0x17/0x37
[   48.384961][    T0]  start_kernel+0x83e/0x864
[   48.389441][    T0]  x86_64_start_reservations+0x29/0x2b
[   48.394874][    T0]  x86_64_start_kernel+0x72/0x76
[   48.399783][    T0]  secondary_startup_64+0xa4/0xb0
[   48.404771][    T0] 
[   48.407071][    T0] Reported by Kernel Concurrency Sanitizer on:
[   48.413206][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0
[   48.419936][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   48.429963][    T0] ==================================================================
[   48.437993][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   48.444585][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0
[   48.451312][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   48.461337][    T0] Call Trace:
[   48.464613][    T0]  dump_stack+0xf5/0x159
[   48.468868][    T0]  panic+0x209/0x639
[   48.472745][    T0]  ? vprintk_func+0x8d/0x140
[   48.477314][    T0]  kcsan_report.cold+0x57/0xeb
[   48.482091][    T0]  __kcsan_setup_watchpoint+0x342/0x500
[   48.487629][    T0]  __tsan_read4+0x2c/0x30
[   48.491937][    T0]  tick_nohz_idle_stop_tick+0x193/0x670
[   48.497461][    T0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   48.503692][    T0]  do_idle+0x1e0/0x2c0
[   48.507739][    T0]  cpu_startup_entry+0x1b/0x20
[   48.512474][    T0]  rest_init+0xec/0xf6
[   48.516522][    T0]  ? trace_event_define_fields_vector_free_moved+0xce/0xce
[   48.523692][    T0]  arch_call_rest_init+0x17/0x37
[   48.528619][    T0]  start_kernel+0x83e/0x864
[   48.533114][    T0]  x86_64_start_reservations+0x29/0x2b
[   48.538549][    T0]  x86_64_start_kernel+0x72/0x76
[   48.543463][    T0]  secondary_startup_64+0xa4/0xb0
[   48.549666][    T0] Kernel Offset: disabled
[   48.553984][    T0] Rebooting in 86400 seconds..