[info] Using makefile-style concurrent boot in runlevel 2.
[   45.614975][   T27] audit: type=1800 audit(1585111195.432:21): pid=7643 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0
[   45.648693][   T27] audit: type=1800 audit(1585111195.432:22): pid=7643 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0
[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[....] 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 '10.128.0.241' (ECDSA) to the list of known hosts.
2020/03/25 04:40:08 fuzzer started
2020/03/25 04:40:10 dialing manager at 10.128.0.105:46357
2020/03/25 04:40:10 syscalls: 2955
2020/03/25 04:40:10 code coverage: enabled
2020/03/25 04:40:10 comparison tracing: enabled
2020/03/25 04:40:10 extra coverage: enabled
2020/03/25 04:40:10 setuid sandbox: enabled
2020/03/25 04:40:10 namespace sandbox: enabled
2020/03/25 04:40:10 Android sandbox: /sys/fs/selinux/policy does not exist
2020/03/25 04:40:10 fault injection: enabled
2020/03/25 04:40:10 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/03/25 04:40:10 net packet injection: enabled
2020/03/25 04:40:10 net device setup: enabled
2020/03/25 04:40:10 concurrency sanitizer: enabled
2020/03/25 04:40:10 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/03/25 04:40:10 adding functions to KCSAN blacklist: 'find_get_pages_range_tag' 
syzkaller login: [   61.812487][    T0] ==================================================================
[   61.820804][    T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_idle_stop_tick
[   61.829720][    T0] 
[   61.832047][    T0] write to 0xffffffff85d056d0 of 4 bytes by task 0 on cpu 1:
[   61.839413][    T0]  tick_nohz_idle_stop_tick+0x52c/0x680
[   61.844940][    T0]  do_idle+0x1ad/0x290
[   61.848996][    T0]  cpu_startup_entry+0x14/0x20
[   61.853747][    T0]  start_secondary+0x164/0x1b0
[   61.858497][    T0]  secondary_startup_64+0xa4/0xb0
[   61.863501][    T0] 
[   61.865834][    T0] read to 0xffffffff85d056d0 of 4 bytes by task 0 on cpu 0:
[   61.873109][    T0]  tick_nohz_idle_stop_tick+0x191/0x680
[   61.878639][    T0]  do_idle+0x1ad/0x290
[   61.882689][    T0]  cpu_startup_entry+0x14/0x20
[   61.887432][    T0]  rest_init+0xe4/0xeb
[   61.891499][    T0]  arch_call_rest_init+0x13/0x2b
[   61.896426][    T0]  start_kernel+0xcc2/0xceb
[   61.900933][    T0]  secondary_startup_64+0xa4/0xb0
[   61.905931][    T0] 
[   61.908235][    T0] Reported by Kernel Concurrency Sanitizer on:
[   61.914385][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.6.0-rc1-syzkaller #0
[   61.922247][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   61.932351][    T0] ==================================================================
[   61.940428][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   61.947032][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.6.0-rc1-syzkaller #0
[   61.954901][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   61.965047][    T0] Call Trace:
[   61.968328][    T0]  dump_stack+0x11d/0x187
[   61.972647][    T0]  panic+0x210/0x640
[   61.976532][    T0]  ? vprintk_func+0x89/0x13a
[   61.981134][    T0]  kcsan_report.cold+0xc/0xf
[   61.985727][    T0]  kcsan_setup_watchpoint+0x3fb/0x440
[   61.991181][    T0]  tick_nohz_idle_stop_tick+0x191/0x680
[   61.996743][    T0]  do_idle+0x1ad/0x290
[   62.000798][    T0]  ? debug_smp_processor_id+0x3f/0x129
[   62.006243][    T0]  cpu_startup_entry+0x14/0x20
[   62.011011][    T0]  rest_init+0xe4/0xeb
[   62.015093][    T0]  arch_call_rest_init+0x13/0x2b
[   62.020070][    T0]  start_kernel+0xcc2/0xceb
[   62.024570][    T0]  secondary_startup_64+0xa4/0xb0
[   62.030869][    T0] Kernel Offset: disabled
[   62.035283][    T0] Rebooting in 86400 seconds..