[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[   34.585018][   T26] audit: type=1800 audit(1570399833.110:25): pid=7143 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[   34.612253][   T26] audit: type=1800 audit(1570399833.110:26): pid=7143 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0
[   34.639203][   T26] audit: type=1800 audit(1570399833.110:27): pid=7143 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 '10.128.0.174' (ECDSA) to the list of known hosts.
2019/10/06 22:10:44 fuzzer started
2019/10/06 22:10:45 dialing manager at 10.128.0.105:35709
2019/10/06 22:10:45 syscalls: 2523
2019/10/06 22:10:45 code coverage: enabled
2019/10/06 22:10:45 comparison tracing: enabled
2019/10/06 22:10:45 extra coverage: extra coverage is not supported by the kernel
2019/10/06 22:10:45 setuid sandbox: enabled
2019/10/06 22:10:45 namespace sandbox: enabled
2019/10/06 22:10:45 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/06 22:10:45 fault injection: enabled
2019/10/06 22:10:45 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/06 22:10:45 net packet injection: enabled
2019/10/06 22:10:45 net device setup: enabled
2019/10/06 22:10:45 concurrency sanitizer: enabled
syzkaller login: [   47.286741][    T0] ==================================================================
[   47.295054][    T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_idle_stop_tick
[   47.303971][    T0] 
[   47.306296][    T0] write to 0xffffffff85caf2d0 of 4 bytes by task 0 on cpu 0:
[   47.313771][    T0]  tick_nohz_idle_stop_tick+0x525/0x670
[   47.319516][    T0]  do_idle+0x1e0/0x2c0
[   47.323577][    T0]  cpu_startup_entry+0x1b/0x20
[   47.328334][    T0]  rest_init+0xec/0xf6
[   47.332406][    T0]  arch_call_rest_init+0x17/0x37
[   47.337333][    T0]  start_kernel+0x83e/0x864
[   47.341843][    T0]  x86_64_start_reservations+0x29/0x2b
[   47.347300][    T0]  x86_64_start_kernel+0x72/0x76
[   47.352422][    T0]  secondary_startup_64+0xa4/0xb0
[   47.357433][    T0] 
[   47.359748][    T0] read to 0xffffffff85caf2d0 of 4 bytes by task 0 on cpu 1:
[   47.367027][    T0]  tick_nohz_idle_stop_tick+0x193/0x670
[   47.372556][    T0]  do_idle+0x1e0/0x2c0
[   47.376603][    T0]  cpu_startup_entry+0x1b/0x20
[   47.381363][    T0]  start_secondary+0x207/0x260
[   47.386115][    T0]  secondary_startup_64+0xa4/0xb0
[   47.391113][    T0] 
[   47.393414][    T0] Reported by Kernel Concurrency Sanitizer on:
[   47.401026][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0
[   47.407963][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   47.418031][    T0] ==================================================================
[   47.426100][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   47.432679][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0
[   47.439419][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   47.449455][    T0] Call Trace:
[   47.452730][    T0]  dump_stack+0xf5/0x159
[   47.456959][    T0]  panic+0x209/0x639
[   47.460864][    T0]  ? vprintk_func+0x8d/0x140
[   47.465448][    T0]  kcsan_report.cold+0x57/0xeb
[   47.470212][    T0]  __kcsan_setup_watchpoint+0x342/0x500
[   47.475738][    T0]  __tsan_read4+0x2c/0x30
[   47.480234][    T0]  tick_nohz_idle_stop_tick+0x193/0x670
[   47.485776][    T0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   47.492816][    T0]  do_idle+0x1e0/0x2c0
[   47.496903][    T0]  ? complete+0x44/0x50
[   47.501041][    T0]  cpu_startup_entry+0x1b/0x20
[   47.505792][    T0]  start_secondary+0x207/0x260
[   47.510537][    T0]  secondary_startup_64+0xa4/0xb0
[   47.517565][    T0] Kernel Offset: disabled
[   47.522043][    T0] Rebooting in 86400 seconds..