[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[   37.456753][   T25] audit: type=1800 audit(1571739444.091:25): pid=6968 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[   37.476566][   T25] audit: type=1800 audit(1571739444.091:26): pid=6968 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0
[   37.496497][   T25] audit: type=1800 audit(1571739444.091:27): pid=6968 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 '10.128.0.243' (ECDSA) to the list of known hosts.
2019/10/22 10:17:34 fuzzer started
2019/10/22 10:17:36 dialing manager at 10.128.0.105:37053
2019/10/22 10:17:36 syscalls: 2524
2019/10/22 10:17:36 code coverage: enabled
2019/10/22 10:17:36 comparison tracing: enabled
2019/10/22 10:17:36 extra coverage: extra coverage is not supported by the kernel
2019/10/22 10:17:36 setuid sandbox: enabled
2019/10/22 10:17:36 namespace sandbox: enabled
2019/10/22 10:17:36 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/22 10:17:36 fault injection: enabled
2019/10/22 10:17:36 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/22 10:17:36 net packet injection: enabled
2019/10/22 10:17:36 net device setup: enabled
2019/10/22 10:17:36 concurrency sanitizer: enabled
syzkaller login: [   49.959799][    T0] ==================================================================
[   49.967920][    T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_idle_stop_tick
[   49.976959][    T0] 
[   49.979307][    T0] write to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 1:
[   49.986654][    T0]  tick_nohz_idle_stop_tick+0x525/0x670
[   49.992177][    T0]  do_idle+0x1a5/0x280
[   49.996223][    T0]  cpu_startup_entry+0x1b/0x20
[   50.000999][    T0]  start_secondary+0x208/0x260
[   50.005742][    T0]  secondary_startup_64+0xa4/0xb0
[   50.010732][    T0] 
[   50.013041][    T0] read to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 0:
[   50.020299][    T0]  tick_nohz_idle_stop_tick+0x193/0x670
[   50.025820][    T0]  do_idle+0x1a5/0x280
[   50.029862][    T0]  cpu_startup_entry+0x1b/0x20
[   50.034600][    T0]  rest_init+0xec/0xf6
[   50.038655][    T0]  arch_call_rest_init+0x17/0x37
[   50.043569][    T0]  start_kernel+0x838/0x85e
[   50.048046][    T0]  x86_64_start_reservations+0x29/0x2b
[   50.053491][    T0]  x86_64_start_kernel+0x72/0x76
[   50.058418][    T0]  secondary_startup_64+0xa4/0xb0
[   50.063458][    T0] 
[   50.065762][    T0] Reported by Kernel Concurrency Sanitizer on:
[   50.071901][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0
[   50.078983][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   50.089185][    T0] ==================================================================
[   50.097219][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   50.103780][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0
[   50.110957][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   50.121000][    T0] Call Trace:
[   50.124314][    T0]  dump_stack+0xf5/0x159
[   50.128565][    T0]  panic+0x210/0x640
[   50.132528][    T0]  ? secondary_startup_64+0xa4/0xb0
[   50.137705][    T0]  ? vprintk_func+0x8d/0x140
[   50.142272][    T0]  kcsan_report.cold+0xc/0x10
[   50.146928][    T0]  __kcsan_setup_watchpoint+0x32e/0x4a0
[   50.152451][    T0]  __tsan_read4+0x2c/0x30
[   50.156759][    T0]  tick_nohz_idle_stop_tick+0x193/0x670
[   50.162285][    T0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   50.168501][    T0]  do_idle+0x1a5/0x280
[   50.172596][    T0]  cpu_startup_entry+0x1b/0x20
[   50.177346][    T0]  rest_init+0xec/0xf6
[   50.181407][    T0]  ? trace_event_define_fields_vector_free_moved+0xce/0xce
[   50.188580][    T0]  arch_call_rest_init+0x17/0x37
[   50.193493][    T0]  start_kernel+0x838/0x85e
[   50.197975][    T0]  x86_64_start_reservations+0x29/0x2b
[   50.203408][    T0]  x86_64_start_kernel+0x72/0x76
[   50.208324][    T0]  secondary_startup_64+0xa4/0xb0
[   50.214544][    T0] Kernel Offset: disabled
[   50.218961][    T0] Rebooting in 86400 seconds..