[info] Using makefile-style concurrent boot in runlevel 2.
[   47.665563][   T27] audit: type=1800 audit(1585907025.774:21): pid=7639 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0
[   47.709690][   T27] audit: type=1800 audit(1585907025.774:22): pid=7639 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 '10.128.0.33' (ECDSA) to the list of known hosts.
2020/04/03 09:43:57 fuzzer started
2020/04/03 09:43:58 dialing manager at 10.128.0.105:45247
2020/04/03 09:43:59 syscalls: 2955
2020/04/03 09:43:59 code coverage: enabled
2020/04/03 09:43:59 comparison tracing: enabled
2020/04/03 09:43:59 extra coverage: enabled
2020/04/03 09:43:59 setuid sandbox: enabled
2020/04/03 09:43:59 namespace sandbox: enabled
2020/04/03 09:43:59 Android sandbox: /sys/fs/selinux/policy does not exist
2020/04/03 09:43:59 fault injection: enabled
2020/04/03 09:43:59 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/04/03 09:43:59 net packet injection: enabled
2020/04/03 09:43:59 net device setup: enabled
2020/04/03 09:43:59 concurrency sanitizer: enabled
2020/04/03 09:43:59 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/04/03 09:44:00 adding functions to KCSAN blacklist: 'shmem_getpage_gfp' 'xas_clear_mark' '__ext4_new_inode' 'wbt_done' 'blk_mq_dispatch_rq_list' 'copy_process' 'ep_poll' 'kauditd_thread' 'blk_mq_sched_dispatch_requests' 'generic_write_end' 
syzkaller login: [   73.713065][    T0] ==================================================================
[   73.721193][    T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_sched_do_timer
[   73.729659][    T0] 
[   73.731969][    T0] write to 0xffffffff85d056d0 of 4 bytes by interrupt on cpu 1:
[   73.739574][    T0]  tick_sched_do_timer+0xb4/0xd0
[   73.744489][    T0]  tick_sched_timer+0x3f/0xd0
[   73.749141][    T0]  __hrtimer_run_queues+0x271/0x600
[   73.754316][    T0]  hrtimer_interrupt+0x226/0x490
[   73.759231][    T0]  smp_apic_timer_interrupt+0xd8/0x270
[   73.764672][    T0]  apic_timer_interrupt+0xf/0x20
[   73.769595][    T0] 
[   73.771904][    T0] read to 0xffffffff85d056d0 of 4 bytes by task 0 on cpu 0:
[   73.779165][    T0]  tick_nohz_idle_stop_tick+0x191/0x680
[   73.784772][    T0]  do_idle+0x1ad/0x290
[   73.788818][    T0]  cpu_startup_entry+0x14/0x20
[   73.793572][    T0]  rest_init+0xe4/0xeb
[   73.797620][    T0]  arch_call_rest_init+0x13/0x2b
[   73.802532][    T0]  start_kernel+0xcc2/0xceb
[   73.807009][    T0]  secondary_startup_64+0xa4/0xb0
[   73.811997][    T0] 
[   73.814295][    T0] Reported by Kernel Concurrency Sanitizer on:
[   73.820599][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.6.0-rc1-syzkaller #0
[   73.828459][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   73.838490][    T0] ==================================================================
[   73.846526][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   73.853088][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.6.0-rc1-syzkaller #0
[   73.860948][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   73.871039][    T0] Call Trace:
[   73.874321][    T0]  dump_stack+0x11d/0x187
[   73.878710][    T0]  panic+0x210/0x640
[   73.882590][    T0]  ? vprintk_func+0x89/0x13a
[   73.887201][    T0]  kcsan_report.cold+0xc/0xf
[   73.891784][    T0]  kcsan_setup_watchpoint+0x3fb/0x440
[   73.897146][    T0]  tick_nohz_idle_stop_tick+0x191/0x680
[   73.902678][    T0]  do_idle+0x1ad/0x290
[   73.906731][    T0]  ? debug_smp_processor_id+0x3f/0x129
[   73.912175][    T0]  cpu_startup_entry+0x14/0x20
[   73.916926][    T0]  rest_init+0xe4/0xeb
[   73.920977][    T0]  arch_call_rest_init+0x13/0x2b
[   73.925892][    T0]  start_kernel+0xcc2/0xceb
[   73.930378][    T0]  secondary_startup_64+0xa4/0xb0
[   73.936560][    T0] Kernel Offset: disabled
[   73.940929][    T0] Rebooting in 86400 seconds..