[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[   42.161382][   T25] audit: type=1800 audit(1571226579.139:25): pid=7090 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[   42.196360][   T25] audit: type=1800 audit(1571226579.139:26): pid=7090 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0
[   42.221977][   T25] audit: type=1800 audit(1571226579.139:27): pid=7090 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 '10.128.1.45' (ECDSA) to the list of known hosts.
2019/10/16 11:49:46 fuzzer started
2019/10/16 11:49:47 dialing manager at 10.128.0.105:34737
2019/10/16 11:49:47 syscalls: 2524
2019/10/16 11:49:47 code coverage: enabled
2019/10/16 11:49:47 comparison tracing: enabled
2019/10/16 11:49:47 extra coverage: extra coverage is not supported by the kernel
2019/10/16 11:49:47 setuid sandbox: enabled
2019/10/16 11:49:47 namespace sandbox: enabled
2019/10/16 11:49:47 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/16 11:49:47 fault injection: enabled
2019/10/16 11:49:47 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/16 11:49:47 net packet injection: enabled
2019/10/16 11:49:47 net device setup: enabled
2019/10/16 11:49:47 concurrency sanitizer: enabled
syzkaller login: [   50.822512][    T0] ==================================================================
[   50.831018][    T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_idle_stop_tick
[   50.841432][    T0] 
[   50.843781][    T0] write to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 0:
[   50.851152][    T0]  tick_nohz_idle_stop_tick+0x525/0x670
[   50.856681][    T0]  do_idle+0x1a5/0x280
[   50.860746][    T0]  cpu_startup_entry+0x1b/0x20
[   50.865846][    T0]  rest_init+0xec/0xf6
[   50.869905][    T0]  arch_call_rest_init+0x17/0x37
[   50.874824][    T0]  start_kernel+0x838/0x85e
[   50.879496][    T0]  x86_64_start_reservations+0x29/0x2b
[   50.885639][    T0]  x86_64_start_kernel+0x72/0x76
[   50.891193][    T0]  secondary_startup_64+0xa4/0xb0
[   50.896198][    T0] 
[   50.898517][    T0] read to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 1:
[   50.905790][    T0]  tick_nohz_idle_stop_tick+0x193/0x670
[   50.911312][    T0]  do_idle+0x1a5/0x280
[   50.915375][    T0]  cpu_startup_entry+0x1b/0x20
[   50.920128][    T0]  start_secondary+0x208/0x260
[   50.924872][    T0]  secondary_startup_64+0xa4/0xb0
[   50.929993][    T0] 
[   50.932305][    T0] Reported by Kernel Concurrency Sanitizer on:
[   50.938434][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0
[   50.945862][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   50.956002][    T0] ==================================================================
[   50.964485][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   50.971149][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0
[   50.978246][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   50.988388][    T0] Call Trace:
[   50.992098][    T0]  dump_stack+0xf5/0x159
[   50.996408][    T0]  panic+0x210/0x640
[   51.000297][    T0]  ? vprintk_func+0x8d/0x140
[   51.004916][    T0]  kcsan_report.cold+0xc/0x1b
[   51.009805][    T0]  __kcsan_setup_watchpoint+0x3ee/0x510
[   51.015545][    T0]  __tsan_read4+0x2c/0x30
[   51.020212][    T0]  tick_nohz_idle_stop_tick+0x193/0x670
[   51.025755][    T0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   51.031986][    T0]  do_idle+0x1a5/0x280
[   51.036046][    T0]  ? complete+0x44/0x50
[   51.040197][    T0]  cpu_startup_entry+0x1b/0x20
[   51.044959][    T0]  start_secondary+0x208/0x260
[   51.049702][    T0]  secondary_startup_64+0xa4/0xb0
[   51.056180][    T0] Kernel Offset: disabled
[   51.060507][    T0] Rebooting in 86400 seconds..