[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[   34.268243][   T25] audit: type=1800 audit(1570567677.490:25): pid=7058 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[   34.295439][   T25] audit: type=1800 audit(1570567677.490:26): pid=7058 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0
[   34.336144][   T25] audit: type=1800 audit(1570567677.490:27): pid=7058 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 '10.128.15.196' (ECDSA) to the list of known hosts.
2019/10/08 20:48:07 fuzzer started
2019/10/08 20:48:09 dialing manager at 10.128.0.105:35069
2019/10/08 20:48:09 syscalls: 2523
2019/10/08 20:48:09 code coverage: enabled
2019/10/08 20:48:09 comparison tracing: enabled
2019/10/08 20:48:09 extra coverage: extra coverage is not supported by the kernel
2019/10/08 20:48:09 setuid sandbox: enabled
2019/10/08 20:48:09 namespace sandbox: enabled
2019/10/08 20:48:09 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/08 20:48:09 fault injection: enabled
2019/10/08 20:48:09 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/08 20:48:09 net packet injection: enabled
2019/10/08 20:48:09 net device setup: enabled
2019/10/08 20:48:09 concurrency sanitizer: enabled
syzkaller login: [   48.100748][    T0] ==================================================================
[   48.108885][    T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_next_event
[   48.117442][    T0] 
[   48.119748][    T0] read to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 0:
[   48.127001][    T0]  tick_nohz_next_event+0x1a4/0x380
[   48.132174][    T0]  tick_nohz_idle_stop_tick+0x3c2/0x670
[   48.137733][    T0]  do_idle+0x1e0/0x2c0
[   48.141777][    T0]  cpu_startup_entry+0x1b/0x20
[   48.146513][    T0]  rest_init+0xec/0xf6
[   48.150557][    T0]  arch_call_rest_init+0x17/0x37
[   48.155557][    T0]  start_kernel+0x83e/0x864
[   48.160073][    T0]  x86_64_start_reservations+0x29/0x2b
[   48.165504][    T0]  x86_64_start_kernel+0x72/0x76
[   48.170417][    T0]  secondary_startup_64+0xa4/0xb0
[   48.175407][    T0] 
[   48.177714][    T0] write to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 1:
[   48.185053][    T0]  tick_nohz_idle_stop_tick+0x525/0x670
[   48.190585][    T0]  do_idle+0x1e0/0x2c0
[   48.194717][    T0]  cpu_startup_entry+0x1b/0x20
[   48.199469][    T0]  start_secondary+0x207/0x260
[   48.204207][    T0]  secondary_startup_64+0xa4/0xb0
[   48.209200][    T0] 
[   48.211502][    T0] Reported by Kernel Concurrency Sanitizer on:
[   48.217633][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0
[   48.224370][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   48.234396][    T0] ==================================================================
[   48.242433][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   48.248996][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0
[   48.255724][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   48.265750][    T0] Call Trace:
[   48.269019][    T0]  dump_stack+0xf5/0x159
[   48.273250][    T0]  panic+0x209/0x639
[   48.277122][    T0]  ? vprintk_func+0x8d/0x140
[   48.281691][    T0]  kcsan_report.cold+0xc/0x1b
[   48.286346][    T0]  __kcsan_setup_watchpoint+0x3ee/0x510
[   48.291871][    T0]  __tsan_write4+0x32/0x40
[   48.296267][    T0]  tick_nohz_idle_stop_tick+0x525/0x670
[   48.301792][    T0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   48.308005][    T0]  do_idle+0x1e0/0x2c0
[   48.312079][    T0]  ? complete+0x44/0x50
[   48.316209][    T0]  cpu_startup_entry+0x1b/0x20
[   48.320949][    T0]  start_secondary+0x207/0x260
[   48.325699][    T0]  secondary_startup_64+0xa4/0xb0
[   48.331984][    T0] Kernel Offset: disabled
[   48.336302][    T0] Rebooting in 86400 seconds..