[   36.388123][   T25] audit: type=1800 audit(1570495693.496:25): pid=7122 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[   36.415543][   T25] audit: type=1800 audit(1570495693.496:26): pid=7122 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0
[   36.442517][   T25] audit: type=1800 audit(1570495693.496:27): pid=7122 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.
[   36.967535][ T7187] sshd (7187) used greatest stack depth: 10032 bytes left
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

Warning: Permanently added '10.128.0.84' (ECDSA) to the list of known hosts.
2019/10/08 00:48:24 fuzzer started
2019/10/08 00:48:25 dialing manager at 10.128.0.105:39369
2019/10/08 00:48:25 syscalls: 2523
2019/10/08 00:48:25 code coverage: enabled
2019/10/08 00:48:25 comparison tracing: enabled
2019/10/08 00:48:25 extra coverage: extra coverage is not supported by the kernel
2019/10/08 00:48:25 setuid sandbox: enabled
2019/10/08 00:48:25 namespace sandbox: enabled
2019/10/08 00:48:25 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/08 00:48:25 fault injection: enabled
2019/10/08 00:48:25 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/08 00:48:25 net packet injection: enabled
2019/10/08 00:48:25 net device setup: enabled
2019/10/08 00:48:25 concurrency sanitizer: enabled
syzkaller login: [   48.986407][    T0] ==================================================================
[   48.994554][    T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_idle_stop_tick
[   49.003453][    T0] 
[   49.005796][    T0] write to 0xffffffff85caf2d0 of 4 bytes by task 0 on cpu 1:
[   49.013157][    T0]  tick_nohz_idle_stop_tick+0x525/0x670
[   49.018682][    T0]  do_idle+0x1e0/0x2c0
[   49.022746][    T0]  cpu_startup_entry+0x1b/0x20
[   49.027751][    T0]  start_secondary+0x207/0x260
[   49.032493][    T0]  secondary_startup_64+0xa4/0xb0
[   49.037485][    T0] 
[   49.039799][    T0] read to 0xffffffff85caf2d0 of 4 bytes by task 0 on cpu 0:
[   49.047071][    T0]  tick_nohz_idle_stop_tick+0x193/0x670
[   49.052596][    T0]  do_idle+0x1e0/0x2c0
[   49.056641][    T0]  cpu_startup_entry+0x1b/0x20
[   49.061378][    T0]  rest_init+0xec/0xf6
[   49.065431][    T0]  arch_call_rest_init+0x17/0x37
[   49.070351][    T0]  start_kernel+0x83e/0x864
[   49.074843][    T0]  x86_64_start_reservations+0x29/0x2b
[   49.080276][    T0]  x86_64_start_kernel+0x72/0x76
[   49.085186][    T0]  secondary_startup_64+0xa4/0xb0
[   49.090177][    T0] 
[   49.092475][    T0] Reported by Kernel Concurrency Sanitizer on:
[   49.098604][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0
[   49.105334][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   49.115370][    T0] ==================================================================
[   49.123425][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   49.129996][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0
[   49.136748][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   49.146777][    T0] Call Trace:
[   49.150056][    T0]  dump_stack+0xf5/0x159
[   49.154276][    T0]  panic+0x209/0x639
[   49.158157][    T0]  ? vprintk_func+0x8d/0x140
[   49.162724][    T0]  kcsan_report.cold+0x57/0xeb
[   49.167469][    T0]  __kcsan_setup_watchpoint+0x342/0x500
[   49.172999][    T0]  __tsan_read4+0x2c/0x30
[   49.177311][    T0]  tick_nohz_idle_stop_tick+0x193/0x670
[   49.182835][    T0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   49.189052][    T0]  do_idle+0x1e0/0x2c0
[   49.193098][    T0]  cpu_startup_entry+0x1b/0x20
[   49.197836][    T0]  rest_init+0xec/0xf6
[   49.201887][    T0]  ? trace_event_define_fields_vector_free_moved+0xce/0xce
[   49.209071][    T0]  arch_call_rest_init+0x17/0x37
[   49.213985][    T0]  start_kernel+0x83e/0x864
[   49.218468][    T0]  x86_64_start_reservations+0x29/0x2b
[   49.223909][    T0]  x86_64_start_kernel+0x72/0x76
[   49.228822][    T0]  secondary_startup_64+0xa4/0xb0
[   49.234476][    T0] Kernel Offset: disabled
[   49.238800][    T0] Rebooting in 86400 seconds..