[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[   34.381957][   T23] audit: type=1800 audit(1570311549.553:25): pid=7085 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[   34.425917][   T23] audit: type=1800 audit(1570311549.553:26): pid=7085 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0
[   34.447544][   T23] audit: type=1800 audit(1570311549.553:27): pid=7085 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 '10.128.0.228' (ECDSA) to the list of known hosts.
2019/10/05 21:39:18 fuzzer started
2019/10/05 21:39:19 dialing manager at 10.128.0.105:35709
2019/10/05 21:39:19 syscalls: 2523
2019/10/05 21:39:19 code coverage: enabled
2019/10/05 21:39:19 comparison tracing: enabled
2019/10/05 21:39:19 extra coverage: extra coverage is not supported by the kernel
2019/10/05 21:39:19 setuid sandbox: enabled
2019/10/05 21:39:19 namespace sandbox: enabled
2019/10/05 21:39:19 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/05 21:39:19 fault injection: enabled
2019/10/05 21:39:19 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/05 21:39:19 net packet injection: enabled
2019/10/05 21:39:19 net device setup: enabled
2019/10/05 21:39:19 concurrency sanitizer: enabled
syzkaller login: [   45.039160][    T0] ==================================================================
[   45.047492][    T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_idle_stop_tick
[   45.056397][    T0] 
[   45.058703][    T0] write to 0xffffffff85caf2d0 of 4 bytes by task 0 on cpu 1:
[   45.066048][    T0]  tick_nohz_idle_stop_tick+0x525/0x670
[   45.071587][    T0]  do_idle+0x1e0/0x2c0
[   45.075632][    T0]  cpu_startup_entry+0x1b/0x20
[   45.080379][    T0]  start_secondary+0x207/0x260
[   45.085127][    T0]  secondary_startup_64+0xa4/0xb0
[   45.090117][    T0] 
[   45.092425][    T0] read to 0xffffffff85caf2d0 of 4 bytes by task 0 on cpu 0:
[   45.099690][    T0]  tick_nohz_idle_stop_tick+0x193/0x670
[   45.105238][    T0]  do_idle+0x1e0/0x2c0
[   45.109288][    T0]  cpu_startup_entry+0x1b/0x20
[   45.114039][    T0]  rest_init+0xec/0xf6
[   45.118093][    T0]  arch_call_rest_init+0x17/0x37
[   45.123052][    T0]  start_kernel+0x83e/0x864
[   45.127581][    T0]  x86_64_start_reservations+0x29/0x2b
[   45.133034][    T0]  x86_64_start_kernel+0x72/0x76
[   45.137950][    T0]  secondary_startup_64+0xa4/0xb0
[   45.142944][    T0] 
[   45.145250][    T0] Reported by Kernel Concurrency Sanitizer on:
[   45.151381][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0
[   45.158283][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   45.168311][    T0] ==================================================================
[   45.176345][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   45.182928][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0
[   45.189667][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   45.199884][    T0] Call Trace:
[   45.203161][    T0]  dump_stack+0xf5/0x159
[   45.207646][    T0]  panic+0x209/0x639
[   45.211520][    T0]  ? vprintk_func+0x8d/0x140
[   45.216090][    T0]  kcsan_report.cold+0x57/0xeb
[   45.220833][    T0]  __kcsan_setup_watchpoint+0x342/0x500
[   45.226548][    T0]  __tsan_read4+0x2c/0x30
[   45.230893][    T0]  tick_nohz_idle_stop_tick+0x193/0x670
[   45.236430][    T0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   45.242649][    T0]  do_idle+0x1e0/0x2c0
[   45.246700][    T0]  cpu_startup_entry+0x1b/0x20
[   45.251449][    T0]  rest_init+0xec/0xf6
[   45.255506][    T0]  ? trace_event_define_fields_vector_free_moved+0xce/0xce
[   45.262682][    T0]  arch_call_rest_init+0x17/0x37
[   45.267616][    T0]  start_kernel+0x83e/0x864
[   45.272101][    T0]  x86_64_start_reservations+0x29/0x2b
[   45.277542][    T0]  x86_64_start_kernel+0x72/0x76
[   45.282457][    T0]  secondary_startup_64+0xa4/0xb0
[   45.288982][    T0] Kernel Offset: disabled
[   45.293301][    T0] Rebooting in 86400 seconds..