[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[   35.185983][   T26] audit: type=1800 audit(1571326636.687:25): pid=7025 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[   35.205883][   T26] audit: type=1800 audit(1571326636.687:26): pid=7025 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0
[   35.227474][   T26] audit: type=1800 audit(1571326636.687:27): pid=7025 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 '10.128.15.217' (ECDSA) to the list of known hosts.
2019/10/17 15:37:27 fuzzer started
2019/10/17 15:37:28 dialing manager at 10.128.0.105:43535
2019/10/17 15:37:28 syscalls: 2524
2019/10/17 15:37:28 code coverage: enabled
2019/10/17 15:37:28 comparison tracing: enabled
2019/10/17 15:37:28 extra coverage: extra coverage is not supported by the kernel
2019/10/17 15:37:28 setuid sandbox: enabled
2019/10/17 15:37:28 namespace sandbox: enabled
2019/10/17 15:37:28 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/17 15:37:28 fault injection: enabled
2019/10/17 15:37:28 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/17 15:37:28 net packet injection: enabled
2019/10/17 15:37:28 net device setup: enabled
2019/10/17 15:37:28 concurrency sanitizer: enabled
syzkaller login: [   47.651313][    T0] ==================================================================
[   47.659901][    T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_idle_stop_tick
[   47.669331][    T0] 
[   47.671644][    T0] write to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 1:
[   47.679002][    T0]  tick_nohz_idle_stop_tick+0x525/0x670
[   47.684530][    T0]  do_idle+0x1a5/0x280
[   47.688580][    T0]  cpu_startup_entry+0x1b/0x20
[   47.693321][    T0]  start_secondary+0x208/0x260
[   47.698097][    T0]  secondary_startup_64+0xa4/0xb0
[   47.703091][    T0] 
[   47.705411][    T0] read to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 0:
[   47.712668][    T0]  tick_nohz_idle_stop_tick+0x193/0x670
[   47.718186][    T0]  do_idle+0x1a5/0x280
[   47.722231][    T0]  cpu_startup_entry+0x1b/0x20
[   47.727328][    T0]  rest_init+0xec/0xf6
[   47.731373][    T0]  arch_call_rest_init+0x17/0x37
[   47.736718][    T0]  start_kernel+0x838/0x85e
[   47.741207][    T0]  x86_64_start_reservations+0x29/0x2b
[   47.746644][    T0]  x86_64_start_kernel+0x72/0x76
[   47.751556][    T0]  secondary_startup_64+0xa4/0xb0
[   47.756546][    T0] 
[   47.758849][    T0] Reported by Kernel Concurrency Sanitizer on:
[   47.764998][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0
[   47.772697][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   47.782737][    T0] ==================================================================
[   47.790857][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   47.797420][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0
[   47.805191][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   47.815230][    T0] Call Trace:
[   47.818511][    T0]  dump_stack+0xf5/0x159
[   47.822734][    T0]  panic+0x210/0x640
[   47.826618][    T0]  ? secondary_startup_64+0xa4/0xb0
[   47.831791][    T0]  ? vprintk_func+0x8d/0x140
[   47.836373][    T0]  kcsan_report.cold+0xc/0x10
[   47.841038][    T0]  __kcsan_setup_watchpoint+0x32e/0x4a0
[   47.846573][    T0]  __tsan_read4+0x2c/0x30
[   47.850882][    T0]  tick_nohz_idle_stop_tick+0x193/0x670
[   47.856408][    T0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   47.862642][    T0]  do_idle+0x1a5/0x280
[   47.866693][    T0]  cpu_startup_entry+0x1b/0x20
[   47.871435][    T0]  rest_init+0xec/0xf6
[   47.875502][    T0]  ? trace_event_define_fields_vector_free_moved+0xce/0xce
[   47.882678][    T0]  arch_call_rest_init+0x17/0x37
[   47.887598][    T0]  start_kernel+0x838/0x85e
[   47.892100][    T0]  x86_64_start_reservations+0x29/0x2b
[   47.897535][    T0]  x86_64_start_kernel+0x72/0x76
[   47.902451][    T0]  secondary_startup_64+0xa4/0xb0
[   47.908214][    T0] Kernel Offset: disabled
[   47.913229][    T0] Rebooting in 86400 seconds..