[   34.610115][   T25] audit: type=1800 audit(1571521459.086:25): pid=7020 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[   34.646351][   T25] audit: type=1800 audit(1571521459.086:26): pid=7020 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0
[   34.674845][   T25] audit: type=1800 audit(1571521459.096:27): pid=7020 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.
[   35.044741][ T7084] sshd (7084) used greatest stack depth: 10136 bytes left
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

Warning: Permanently added '10.128.0.197' (ECDSA) to the list of known hosts.
2019/10/19 21:44:30 fuzzer started
2019/10/19 21:44:31 dialing manager at 10.128.0.105:43535
2019/10/19 21:44:31 syscalls: 2524
2019/10/19 21:44:31 code coverage: enabled
2019/10/19 21:44:31 comparison tracing: enabled
2019/10/19 21:44:31 extra coverage: extra coverage is not supported by the kernel
2019/10/19 21:44:31 setuid sandbox: enabled
2019/10/19 21:44:31 namespace sandbox: enabled
2019/10/19 21:44:31 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/19 21:44:31 fault injection: enabled
2019/10/19 21:44:31 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/19 21:44:31 net packet injection: enabled
2019/10/19 21:44:31 net device setup: enabled
2019/10/19 21:44:31 concurrency sanitizer: enabled
syzkaller login: [   47.564011][    T0] ==================================================================
[   47.572150][    T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_do_timer
[   47.580284][    T0] 
[   47.582594][    T0] write to 0xffffffff85cb2790 of 4 bytes by interrupt on cpu 0:
[   47.590472][    T0]  tick_sched_do_timer+0xc0/0xe0
[   47.595384][    T0]  tick_sched_timer+0x43/0xe0
[   47.600087][    T0]  __hrtimer_run_queues+0x288/0x600
[   47.605259][    T0]  hrtimer_interrupt+0x22a/0x480
[   47.610194][    T0]  smp_apic_timer_interrupt+0xdc/0x280
[   47.615640][    T0]  apic_timer_interrupt+0xf/0x20
[   47.620568][    T0]  native_safe_halt+0xe/0x10
[   47.625145][    T0]  arch_cpu_idle+0x1f/0x30
[   47.629548][    T0]  default_idle_call+0x1e/0x40
[   47.634294][    T0]  do_idle+0x1af/0x280
[   47.638342][    T0]  cpu_startup_entry+0x1b/0x20
[   47.643086][    T0]  rest_init+0xec/0xf6
[   47.647140][    T0]  arch_call_rest_init+0x17/0x37
[   47.652076][    T0]  start_kernel+0x838/0x85e
[   47.656558][    T0] 
[   47.658869][    T0] read to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 1:
[   47.666131][    T0]  tick_nohz_next_event+0x1a4/0x380
[   47.671307][    T0]  tick_nohz_idle_stop_tick+0x3c2/0x670
[   47.676838][    T0]  do_idle+0x1a5/0x280
[   47.680985][    T0]  cpu_startup_entry+0x1b/0x20
[   47.685734][    T0]  start_secondary+0x208/0x260
[   47.690489][    T0]  secondary_startup_64+0xa4/0xb0
[   47.695483][    T0] 
[   47.697792][    T0] Reported by Kernel Concurrency Sanitizer on:
[   47.703959][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0
[   47.711057][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   47.721116][    T0] ==================================================================
[   47.729162][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   47.735727][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0
[   47.742807][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   47.752838][    T0] Call Trace:
[   47.756108][    T0]  dump_stack+0xf5/0x159
[   47.760332][    T0]  panic+0x210/0x640
[   47.764206][    T0]  ? vprintk_func+0x8d/0x140
[   47.768784][    T0]  kcsan_report.cold+0xc/0x10
[   47.773438][    T0]  __kcsan_setup_watchpoint+0x32e/0x4a0
[   47.778960][    T0]  __tsan_read4+0x2c/0x30
[   47.783284][    T0]  tick_nohz_next_event+0x1a4/0x380
[   47.788475][    T0]  tick_nohz_idle_stop_tick+0x3c2/0x670
[   47.793996][    T0]  ? __tsan_read4+0x2c/0x30
[   47.798489][    T0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   47.804706][    T0]  do_idle+0x1a5/0x280
[   47.809020][    T0]  ? complete+0x44/0x50
[   47.813153][    T0]  cpu_startup_entry+0x1b/0x20
[   47.817981][    T0]  start_secondary+0x208/0x260
[   47.822724][    T0]  secondary_startup_64+0xa4/0xb0
[   47.829196][    T0] Kernel Offset: disabled
[   47.833556][    T0] Rebooting in 86400 seconds..