[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[   36.391451][   T26] audit: type=1800 audit(1572729174.414:25): 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
[   36.427198][   T26] audit: type=1800 audit(1572729174.414:26): 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
[   36.460745][   T26] audit: type=1800 audit(1572729174.414:27): 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.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

Warning: Permanently added '10.128.10.48' (ECDSA) to the list of known hosts.
2019/11/02 21:13:01 fuzzer started
2019/11/02 21:13:03 dialing manager at 10.128.0.105:46001
2019/11/02 21:13:03 syscalls: 2554
2019/11/02 21:13:03 code coverage: enabled
2019/11/02 21:13:03 comparison tracing: enabled
2019/11/02 21:13:03 extra coverage: extra coverage is not supported by the kernel
2019/11/02 21:13:03 setuid sandbox: enabled
2019/11/02 21:13:03 namespace sandbox: enabled
2019/11/02 21:13:03 Android sandbox: /sys/fs/selinux/policy does not exist
2019/11/02 21:13:03 fault injection: enabled
2019/11/02 21:13:03 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/11/02 21:13:03 net packet injection: enabled
2019/11/02 21:13:03 net device setup: enabled
2019/11/02 21:13:03 concurrency sanitizer: enabled
syzkaller login: [   46.706865][ T7294] KCSAN: could not find function: 'poll_schedule_timeout'
2019/11/02 21:13:08 adding functions to KCSAN blacklist: 'rcu_gp_fqs_check_wake' 'tcp_add_backlog' 'poll_schedule_timeout' 'ext4_xattr_get' '__nf_ct_refresh_acct' 'ktime_get_real_seconds' '__nf_conntrack_find_get' 'find_next_bit' 'task_dump_owner' 'mod_timer' 'pipe_poll' 'tomoyo_supervisor' 'add_timer' 'generic_write_end' 'pcpu_alloc' '__hrtimer_run_queues' '__tcp_select_window' 'ep_poll' 'tcp_poll' 'vm_area_dup' 'taskstats_exit' 'generic_permission' 
[   52.958735][    T0] ==================================================================
[   52.966908][    T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_next_event
[   52.975462][    T0] 
[   52.977774][    T0] write to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 0:
[   52.985123][    T0]  tick_nohz_idle_stop_tick+0x525/0x670
[   52.990643][    T0]  do_idle+0x1a5/0x280
[   52.994685][    T0]  cpu_startup_entry+0x1b/0x20
[   52.999466][    T0]  rest_init+0xec/0xf6
[   53.003520][    T0]  arch_call_rest_init+0x17/0x37
[   53.008430][    T0]  start_kernel+0x838/0x85e
[   53.012919][    T0]  x86_64_start_reservations+0x29/0x2b
[   53.018352][    T0]  x86_64_start_kernel+0x72/0x76
[   53.023276][    T0]  secondary_startup_64+0xa4/0xb0
[   53.028279][    T0] 
[   53.030587][    T0] read to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 1:
[   53.037843][    T0]  tick_nohz_next_event+0x1a4/0x380
[   53.043017][    T0]  tick_nohz_idle_stop_tick+0x3c2/0x670
[   53.048535][    T0]  do_idle+0x1a5/0x280
[   53.052577][    T0]  cpu_startup_entry+0x1b/0x20
[   53.057318][    T0]  start_secondary+0x208/0x260
[   53.062057][    T0]  secondary_startup_64+0xa4/0xb0
[   53.067046][    T0] 
[   53.069345][    T0] Reported by Kernel Concurrency Sanitizer on:
[   53.075478][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0
[   53.082554][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   53.092583][    T0] ==================================================================
[   53.100630][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   53.107379][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0
[   53.114473][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   53.124510][    T0] Call Trace:
[   53.127797][    T0]  dump_stack+0xf5/0x159
[   53.132025][    T0]  panic+0x210/0x640
[   53.135907][    T0]  ? vprintk_func+0x8d/0x140
[   53.140485][    T0]  kcsan_report.cold+0xc/0x10
[   53.145143][    T0]  __kcsan_setup_watchpoint+0x32e/0x4a0
[   53.150685][    T0]  __tsan_read4+0x2c/0x30
[   53.154996][    T0]  tick_nohz_next_event+0x1a4/0x380
[   53.160191][    T0]  tick_nohz_idle_stop_tick+0x3c2/0x670
[   53.165719][    T0]  ? __tsan_read4+0x2c/0x30
[   53.170204][    T0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   53.176441][    T0]  do_idle+0x1a5/0x280
[   53.180494][    T0]  ? complete+0x44/0x50
[   53.184636][    T0]  cpu_startup_entry+0x1b/0x20
[   53.189382][    T0]  start_secondary+0x208/0x260
[   53.194127][    T0]  secondary_startup_64+0xa4/0xb0
[   53.200550][    T0] Kernel Offset: disabled
[   53.204872][    T0] Rebooting in 86400 seconds..