[   58.799313][   T27] audit: type=1800 audit(1585957967.235:24): pid=7624 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="sudo" dev="sda1" ino=2487 res=0
[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[   59.357006][   T27] audit: type=1800 audit(1585957967.865:25): pid=7624 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[   59.397334][   T27] audit: type=1800 audit(1585957967.865:26): pid=7624 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 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 '10.128.1.21' (ECDSA) to the list of known hosts.
2020/04/03 23:52:58 fuzzer started
2020/04/03 23:52:59 dialing manager at 10.128.0.105:45617
2020/04/03 23:53:07 syscalls: 2955
2020/04/03 23:53:07 code coverage: enabled
2020/04/03 23:53:07 comparison tracing: enabled
2020/04/03 23:53:07 extra coverage: enabled
2020/04/03 23:53:07 setuid sandbox: enabled
2020/04/03 23:53:07 namespace sandbox: enabled
2020/04/03 23:53:07 Android sandbox: /sys/fs/selinux/policy does not exist
2020/04/03 23:53:07 fault injection: enabled
2020/04/03 23:53:07 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/04/03 23:53:07 net packet injection: enabled
2020/04/03 23:53:07 net device setup: enabled
2020/04/03 23:53:07 concurrency sanitizer: enabled
2020/04/03 23:53:07 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/04/03 23:53:07 USB emulation: /dev/raw-gadget does not exist
syzkaller login: [   79.515691][ T7789] KCSAN: could not find function: 'poll_schedule_timeout'
[   80.250405][ T7789] KCSAN: could not find function: '_find_next_bit'
2020/04/03 23:53:10 adding functions to KCSAN blacklist: 'ep_poll' 'find_get_pages_range_tag' 'ktime_get_real_seconds' 'copy_process' 'tick_nohz_next_event' 'poll_schedule_timeout' 'atime_needs_update' 'add_timer_on' 'dd_has_work' '_find_next_bit' 'add_timer' 'do_nanosleep' 'blk_mq_get_request' 'do_syslog' '__ext4_new_inode' 'echo_char' 'shmem_file_read_iter' 'kauditd_thread' 'ext4_nonda_switch' 'xas_clear_mark' 'mod_timer' 'blk_mq_sched_dispatch_requests' 'run_timer_softirq' 'audit_log_start' 'generic_write_end' 'lruvec_lru_size' 
[   96.097432][    T0] ==================================================================
[   96.105593][    T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_idle_stop_tick
[   96.114512][    T0] 
[   96.116848][    T0] write to 0xffffffff85d056d0 of 4 bytes by task 0 on cpu 0:
[   96.124225][    T0]  tick_nohz_idle_stop_tick+0x52c/0x680
[   96.129777][    T0]  do_idle+0x1ad/0x290
[   96.133848][    T0]  cpu_startup_entry+0x14/0x20
[   96.138618][    T0]  rest_init+0xe4/0xeb
[   96.142688][    T0]  arch_call_rest_init+0x13/0x2b
[   96.147634][    T0]  start_kernel+0xcc2/0xceb
[   96.152191][    T0]  secondary_startup_64+0xa4/0xb0
[   96.157210][    T0] 
[   96.159549][    T0] read to 0xffffffff85d056d0 of 4 bytes by task 0 on cpu 1:
[   96.166849][    T0]  tick_nohz_idle_stop_tick+0x191/0x680
[   96.172505][    T0]  do_idle+0x1ad/0x290
[   96.176586][    T0]  cpu_startup_entry+0x14/0x20
[   96.181364][    T0]  start_secondary+0x164/0x1b0
[   96.186138][    T0]  secondary_startup_64+0xa4/0xb0
[   96.191150][    T0] 
[   96.193475][    T0] Reported by Kernel Concurrency Sanitizer on:
[   96.199635][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.6.0-rc1-syzkaller #0
[   96.207527][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   96.217606][    T0] ==================================================================
[   96.225668][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   96.232256][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.6.0-rc1-syzkaller #0
[   96.240140][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   96.250192][    T0] Call Trace:
[   96.253502][    T0]  dump_stack+0x11d/0x187
[   96.257883][    T0]  panic+0x210/0x640
[   96.261769][    T0]  ? vprintk_func+0x89/0x13a
[   96.266647][    T0]  kcsan_report.cold+0xc/0xf
[   96.271257][    T0]  kcsan_setup_watchpoint+0x3fb/0x440
[   96.276648][    T0]  tick_nohz_idle_stop_tick+0x191/0x680
[   96.282205][    T0]  do_idle+0x1ad/0x290
[   96.286285][    T0]  ? debug_smp_processor_id+0x3a/0x129
[   96.291749][    T0]  cpu_startup_entry+0x14/0x20
[   96.296518][    T0]  start_secondary+0x164/0x1b0
[   96.301301][    T0]  secondary_startup_64+0xa4/0xb0
[   96.307603][    T0] Kernel Offset: disabled
[   96.311936][    T0] Rebooting in 86400 seconds..