[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[   35.862318][   T25] audit: type=1800 audit(1571140873.893:25): pid=7028 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[   35.882299][   T25] audit: type=1800 audit(1571140873.893:26): pid=7028 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0
[   35.919103][   T25] audit: type=1800 audit(1571140873.893:27): pid=7028 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 '10.128.15.220' (ECDSA) to the list of known hosts.
2019/10/15 12:01:24 fuzzer started
2019/10/15 12:01:26 dialing manager at 10.128.0.105:38903
2019/10/15 12:01:26 syscalls: 2523
2019/10/15 12:01:26 code coverage: enabled
2019/10/15 12:01:26 comparison tracing: enabled
2019/10/15 12:01:26 extra coverage: extra coverage is not supported by the kernel
2019/10/15 12:01:26 setuid sandbox: enabled
2019/10/15 12:01:26 namespace sandbox: enabled
2019/10/15 12:01:26 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/15 12:01:26 fault injection: enabled
2019/10/15 12:01:26 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/15 12:01:26 net packet injection: enabled
2019/10/15 12:01:26 net device setup: enabled
2019/10/15 12:01:26 concurrency sanitizer: enabled
syzkaller login: [   48.462855][    T0] ==================================================================
[   48.470958][    T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_idle_stop_tick
[   48.479860][    T0] 
[   48.482169][    T0] write to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 1:
[   48.489538][    T0]  tick_nohz_idle_stop_tick+0x525/0x670
[   48.495057][    T0]  do_idle+0x1e0/0x2c0
[   48.499225][    T0]  cpu_startup_entry+0x1b/0x20
[   48.503971][    T0]  start_secondary+0x207/0x260
[   48.508744][    T0]  secondary_startup_64+0xa4/0xb0
[   48.513740][    T0] 
[   48.516053][    T0] read to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 0:
[   48.523401][    T0]  tick_nohz_idle_stop_tick+0x193/0x670
[   48.528925][    T0]  do_idle+0x1e0/0x2c0
[   48.532972][    T0]  cpu_startup_entry+0x1b/0x20
[   48.537709][    T0]  rest_init+0xec/0xf6
[   48.541750][    T0]  arch_call_rest_init+0x17/0x37
[   48.546668][    T0]  start_kernel+0x83e/0x864
[   48.551147][    T0]  x86_64_start_reservations+0x29/0x2b
[   48.556581][    T0]  x86_64_start_kernel+0x72/0x76
[   48.561500][    T0]  secondary_startup_64+0xa4/0xb0
[   48.567011][    T0] 
[   48.569331][    T0] Reported by Kernel Concurrency Sanitizer on:
[   48.575456][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0
[   48.582188][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   48.592303][    T0] ==================================================================
[   48.600356][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   48.607183][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0
[   48.613921][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   48.624473][    T0] Call Trace:
[   48.627750][    T0]  dump_stack+0xf5/0x159
[   48.631980][    T0]  panic+0x209/0x639
[   48.635852][    T0]  ? secondary_startup_64+0xa4/0xb0
[   48.641027][    T0]  ? vprintk_func+0x8d/0x140
[   48.645597][    T0]  kcsan_report.cold+0xc/0x1b
[   48.650251][    T0]  __kcsan_setup_watchpoint+0x3ee/0x510
[   48.656552][    T0]  __tsan_read4+0x2c/0x30
[   48.660859][    T0]  tick_nohz_idle_stop_tick+0x193/0x670
[   48.666392][    T0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   48.672610][    T0]  do_idle+0x1e0/0x2c0
[   48.676659][    T0]  cpu_startup_entry+0x1b/0x20
[   48.681412][    T0]  rest_init+0xec/0xf6
[   48.685478][    T0]  ? trace_event_define_fields_vector_free_moved+0xce/0xce
[   48.692655][    T0]  arch_call_rest_init+0x17/0x37
[   48.697759][    T0]  start_kernel+0x83e/0x864
[   48.702277][    T0]  x86_64_start_reservations+0x29/0x2b
[   48.707717][    T0]  x86_64_start_kernel+0x72/0x76
[   48.712637][    T0]  secondary_startup_64+0xa4/0xb0
[   48.719161][    T0] Kernel Offset: disabled
[   48.723483][    T0] Rebooting in 86400 seconds..