[   37.763402][   T26] audit: type=1800 audit(1570837364.984:26): pid=7142 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 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 '10.128.0.94' (ECDSA) to the list of known hosts.
2019/10/11 23:42:52 fuzzer started
2019/10/11 23:42:53 dialing manager at 10.128.0.105:43913
2019/10/11 23:42:53 syscalls: 2523
2019/10/11 23:42:53 code coverage: enabled
2019/10/11 23:42:53 comparison tracing: enabled
2019/10/11 23:42:53 extra coverage: extra coverage is not supported by the kernel
2019/10/11 23:42:53 setuid sandbox: enabled
2019/10/11 23:42:53 namespace sandbox: enabled
2019/10/11 23:42:53 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/11 23:42:53 fault injection: enabled
2019/10/11 23:42:53 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/11 23:42:53 net packet injection: enabled
2019/10/11 23:42:53 net device setup: enabled
2019/10/11 23:42:53 concurrency sanitizer: enabled
syzkaller login: [   47.236696][    T0] ==================================================================
[   47.244935][    T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_next_event
[   47.253573][    T0] 
[   47.255935][    T0] read to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 0:
[   47.263235][    T0]  tick_nohz_next_event+0x1a4/0x380
[   47.268453][    T0]  tick_nohz_idle_stop_tick+0x3c2/0x670
[   47.273976][    T0]  do_idle+0x1e0/0x2c0
[   47.278034][    T0]  cpu_startup_entry+0x1b/0x20
[   47.282778][    T0]  rest_init+0xec/0xf6
[   47.286826][    T0]  arch_call_rest_init+0x17/0x37
[   47.291755][    T0]  start_kernel+0x83e/0x864
[   47.296286][    T0]  x86_64_start_reservations+0x29/0x2b
[   47.301761][    T0]  x86_64_start_kernel+0x72/0x76
[   47.306682][    T0]  secondary_startup_64+0xa4/0xb0
[   47.311723][    T0] 
[   47.314039][    T0] write to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 1:
[   47.321389][    T0]  tick_nohz_idle_stop_tick+0x525/0x670
[   47.326921][    T0]  do_idle+0x1e0/0x2c0
[   47.330964][    T0]  cpu_startup_entry+0x1b/0x20
[   47.335709][    T0]  start_secondary+0x207/0x260
[   47.340573][    T0]  secondary_startup_64+0xa4/0xb0
[   47.345576][    T0] 
[   47.347924][    T0] Reported by Kernel Concurrency Sanitizer on:
[   47.354060][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0
[   47.360797][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   47.370842][    T0] ==================================================================
[   47.378876][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   47.385439][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0
[   47.392172][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   47.402198][    T0] Call Trace:
[   47.405481][    T0]  dump_stack+0xf5/0x159
[   47.409712][    T0]  panic+0x209/0x639
[   47.413584][    T0]  ? vprintk_func+0x8d/0x140
[   47.418158][    T0]  kcsan_report.cold+0xc/0x1b
[   47.422824][    T0]  __kcsan_setup_watchpoint+0x3ee/0x510
[   47.428345][    T0]  __tsan_write4+0x32/0x40
[   47.432738][    T0]  tick_nohz_idle_stop_tick+0x525/0x670
[   47.438270][    T0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   47.444486][    T0]  do_idle+0x1e0/0x2c0
[   47.448540][    T0]  ? complete+0x44/0x50
[   47.452672][    T0]  cpu_startup_entry+0x1b/0x20
[   47.457427][    T0]  start_secondary+0x207/0x260
[   47.462173][    T0]  secondary_startup_64+0xa4/0xb0
[   47.468926][    T0] Kernel Offset: disabled
[   47.473247][    T0] Rebooting in 86400 seconds..