[info] Using makefile-style concurrent boot in runlevel 2.
[   49.757195][   T27] audit: type=1800 audit(1581349863.586:21): pid=7773 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0
[   49.801862][   T27] audit: type=1800 audit(1581349863.586:22): pid=7773 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 '10.128.0.34' (ECDSA) to the list of known hosts.
2020/02/10 15:51:16 fuzzer started
2020/02/10 15:51:18 dialing manager at 10.128.0.105:43415
2020/02/10 15:51:19 syscalls: 2904
2020/02/10 15:51:19 code coverage: enabled
2020/02/10 15:51:19 comparison tracing: enabled
2020/02/10 15:51:19 extra coverage: enabled
2020/02/10 15:51:19 setuid sandbox: enabled
2020/02/10 15:51:19 namespace sandbox: enabled
2020/02/10 15:51:19 Android sandbox: /sys/fs/selinux/policy does not exist
2020/02/10 15:51:19 fault injection: enabled
2020/02/10 15:51:19 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/02/10 15:51:19 net packet injection: enabled
2020/02/10 15:51:19 net device setup: enabled
2020/02/10 15:51:19 concurrency sanitizer: enabled
2020/02/10 15:51:19 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/02/10 15:51:19 adding functions to KCSAN blacklist: 'tick_nohz_idle_stop_tick' 'ep_poll' 'do_signal_stop' 'mod_timer' 'tomoyo_supervisor' 'ext4_free_inodes_count' 'ext4_nonda_switch' 'ext4_free_inode' 'taskstats_exit' 
syzkaller login: [   69.746017][    T0] ==================================================================
[   69.754808][    T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_do_timer
[   69.762949][    T0] 
[   69.765276][    T0] write to 0xffffffff85ebb050 of 4 bytes by interrupt on cpu 0:
[   69.772918][    T0]  tick_sched_do_timer+0xc0/0xe0
[   69.777867][    T0]  tick_sched_timer+0x43/0xe0
[   69.782570][    T0]  __hrtimer_run_queues+0x274/0x5f0
[   69.787772][    T0]  hrtimer_interrupt+0x22a/0x480
[   69.792708][    T0]  smp_apic_timer_interrupt+0xdc/0x280
[   69.799138][    T0]  apic_timer_interrupt+0xf/0x20
[   69.804074][    T0] 
[   69.806402][    T0] read to 0xffffffff85ebb050 of 4 bytes by task 0 on cpu 1:
[   69.813689][    T0]  tick_nohz_next_event+0x19d/0x370
[   69.818887][    T0]  tick_nohz_idle_stop_tick+0x3c2/0x670
[   69.824441][    T0]  do_idle+0x1b8/0x290
[   69.828533][    T0]  cpu_startup_entry+0x1b/0x20
[   69.834430][    T0]  start_secondary+0x168/0x1b0
[   69.839202][    T0]  secondary_startup_64+0xa4/0xb0
[   69.844219][    T0] 
[   69.846601][    T0] Reported by Kernel Concurrency Sanitizer on:
[   69.852762][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.5.0-rc1-syzkaller #0
[   69.860664][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   69.870937][    T0] ==================================================================
[   69.879257][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   69.886645][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.5.0-rc1-syzkaller #0
[   69.894849][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   69.904918][    T0] Call Trace:
[   69.908219][    T0]  dump_stack+0x11d/0x181
[   69.912661][    T0]  panic+0x210/0x640
[   69.916601][    T0]  ? vprintk_func+0x8d/0x140
[   69.921283][    T0]  kcsan_report.cold+0xc/0x15
[   69.925973][    T0]  kcsan_setup_watchpoint+0x2e2/0x380
[   69.931355][    T0]  __tsan_read4+0xc6/0x100
[   69.935761][    T0]  tick_nohz_next_event+0x19d/0x370
[   69.941112][    T0]  tick_nohz_idle_stop_tick+0x3c2/0x670
[   69.946661][    T0]  ? debug_smp_processor_id+0x43/0x137
[   69.952127][    T0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   69.958413][    T0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   69.964766][    T0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   69.971132][    T0]  do_idle+0x1b8/0x290
[   69.975257][    T0]  ? debug_smp_processor_id+0x3e/0x137
[   69.980721][    T0]  cpu_startup_entry+0x1b/0x20
[   69.985507][    T0]  start_secondary+0x168/0x1b0
[   69.990316][    T0]  secondary_startup_64+0xa4/0xb0
[   69.996123][    T0] Kernel Offset: disabled
[   70.000445][    T0] Rebooting in 86400 seconds..