[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 37.740521][ T25] audit: type=1800 audit(1570773737.643:25): pid=7030 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 37.760183][ T25] audit: type=1800 audit(1570773737.643:26): pid=7030 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 37.780100][ T25] audit: type=1800 audit(1570773737.653:27): pid=7030 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. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.1.53' (ECDSA) to the list of known hosts. 2019/10/11 06:02:25 fuzzer started 2019/10/11 06:02:27 dialing manager at 10.128.0.105:37331 2019/10/11 06:02:27 syscalls: 2523 2019/10/11 06:02:27 code coverage: enabled 2019/10/11 06:02:27 comparison tracing: enabled 2019/10/11 06:02:27 extra coverage: extra coverage is not supported by the kernel 2019/10/11 06:02:27 setuid sandbox: enabled 2019/10/11 06:02:27 namespace sandbox: enabled 2019/10/11 06:02:27 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/11 06:02:27 fault injection: enabled 2019/10/11 06:02:27 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/11 06:02:27 net packet injection: enabled 2019/10/11 06:02:27 net device setup: enabled 2019/10/11 06:02:27 concurrency sanitizer: enabled syzkaller login: [ 47.993205][ T0] ================================================================== [ 48.001359][ T0] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 48.010273][ T0] [ 48.012597][ T0] write to 0xffffffff8603f008 of 8 bytes by interrupt on cpu 1: [ 48.020229][ T0] tick_do_update_jiffies64+0x105/0x260 [ 48.025780][ T0] tick_sched_do_timer+0xd4/0xe0 [ 48.030714][ T0] tick_sched_timer+0x43/0xe0 [ 48.035412][ T0] __hrtimer_run_queues+0x288/0x600 [ 48.040600][ T0] hrtimer_interrupt+0x22a/0x480 [ 48.045520][ T0] smp_apic_timer_interrupt+0xdc/0x280 [ 48.050961][ T0] apic_timer_interrupt+0xf/0x20 [ 48.055893][ T0] __kcsan_check_watchpoint+0xbb/0x180 [ 48.061338][ T0] __tsan_write8+0x18/0x40 [ 48.065741][ T0] __handle_mm_fault+0xae0/0x2d00 [ 48.070751][ T0] handle_mm_fault+0x21b/0x520 [ 48.075507][ T0] __do_page_fault+0x3fb/0x9e0 [ 48.080265][ T0] do_page_fault+0x54/0x233 [ 48.084753][ T0] page_fault+0x34/0x40 [ 48.088889][ T0] [ 48.091211][ T0] read to 0xffffffff8603f008 of 8 bytes by task 0 on cpu 0: [ 48.098480][ T0] tick_do_update_jiffies64+0x2b/0x260 [ 48.103921][ T0] __tick_nohz_idle_restart_tick+0x31/0x1b0 [ 48.109795][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 48.114889][ T0] do_idle+0xb0/0x2c0 [ 48.118858][ T0] cpu_startup_entry+0x1b/0x20 [ 48.123625][ T0] rest_init+0xec/0xf6 [ 48.127680][ T0] arch_call_rest_init+0x17/0x37 [ 48.132639][ T0] start_kernel+0x83e/0x864 [ 48.137132][ T0] x86_64_start_reservations+0x29/0x2b [ 48.142572][ T0] x86_64_start_kernel+0x72/0x76 [ 48.147494][ T0] secondary_startup_64+0xa4/0xb0 [ 48.152498][ T0] [ 48.154818][ T0] Reported by Kernel Concurrency Sanitizer on: [ 48.160963][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 48.167706][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.177747][ T0] ================================================================== [ 48.185794][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 48.192372][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 48.199119][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.209160][ T0] Call Trace: [ 48.212440][ T0] dump_stack+0xf5/0x159 [ 48.216671][ T0] panic+0x209/0x639 [ 48.220556][ T0] ? x86_64_start_reservations+0x29/0x2b [ 48.226176][ T0] ? vprintk_func+0x8d/0x140 [ 48.230764][ T0] kcsan_report.cold+0xc/0x1b [ 48.235441][ T0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 48.240971][ T0] __tsan_read8+0x2c/0x30 [ 48.245288][ T0] tick_do_update_jiffies64+0x2b/0x260 [ 48.250743][ T0] __tick_nohz_idle_restart_tick+0x31/0x1b0 [ 48.256624][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 48.261731][ T0] do_idle+0xb0/0x2c0 [ 48.265711][ T0] cpu_startup_entry+0x1b/0x20 [ 48.270470][ T0] rest_init+0xec/0xf6 [ 48.274541][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 48.281724][ T0] arch_call_rest_init+0x17/0x37 [ 48.286779][ T0] start_kernel+0x83e/0x864 [ 48.291281][ T0] x86_64_start_reservations+0x29/0x2b [ 48.296737][ T0] x86_64_start_kernel+0x72/0x76 [ 48.301672][ T0] secondary_startup_64+0xa4/0xb0 [ 48.308030][ T0] Kernel Offset: disabled [ 48.312355][ T0] Rebooting in 86400 seconds..