[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.258361][ T25] audit: type=1800 audit(1570785755.611:25): pid=7091 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.299075][ T25] audit: type=1800 audit(1570785755.611:26): pid=7091 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.319301][ T25] audit: type=1800 audit(1570785755.611:27): pid=7091 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 '10.128.0.33' (ECDSA) to the list of known hosts. 2019/10/11 09:22:44 fuzzer started 2019/10/11 09:22:46 dialing manager at 10.128.0.105:37331 2019/10/11 09:22:46 syscalls: 2523 2019/10/11 09:22:46 code coverage: enabled 2019/10/11 09:22:46 comparison tracing: enabled 2019/10/11 09:22:46 extra coverage: extra coverage is not supported by the kernel 2019/10/11 09:22:46 setuid sandbox: enabled 2019/10/11 09:22:46 namespace sandbox: enabled 2019/10/11 09:22:46 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/11 09:22:46 fault injection: enabled 2019/10/11 09:22:46 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/11 09:22:46 net packet injection: enabled 2019/10/11 09:22:46 net device setup: enabled 2019/10/11 09:22:46 concurrency sanitizer: enabled syzkaller login: [ 47.729270][ T0] ================================================================== [ 47.737396][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_sched_do_timer [ 47.745990][ T0] [ 47.748295][ T0] write to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 1: [ 47.755941][ T0] tick_sched_do_timer+0xc0/0xe0 [ 47.760857][ T0] tick_sched_timer+0x43/0xe0 [ 47.765510][ T0] __hrtimer_run_queues+0x288/0x600 [ 47.770719][ T0] hrtimer_interrupt+0x22a/0x480 [ 47.775633][ T0] smp_apic_timer_interrupt+0xdc/0x280 [ 47.781064][ T0] apic_timer_interrupt+0xf/0x20 [ 47.785976][ T0] __kcsan_setup_watchpoint+0x282/0x510 [ 47.791516][ T0] __tsan_read8+0x2c/0x30 [ 47.795823][ T0] __free_pages_ok+0x559/0x640 [ 47.800561][ T0] free_compound_page+0x3d/0x50 [ 47.805392][ T0] __put_compound_page+0x4e/0x70 [ 47.810312][ T0] __put_page+0x54/0xd0 [ 47.814454][ T0] skb_release_data+0x1ba/0x3a0 [ 47.819303][ T0] skb_release_all+0x44/0x60 [ 47.823908][ T0] [ 47.826223][ T0] read to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 0: [ 47.833490][ T0] tick_nohz_idle_stop_tick+0x193/0x670 [ 47.839042][ T0] do_idle+0x1e0/0x2c0 [ 47.843110][ T0] cpu_startup_entry+0x1b/0x20 [ 47.847848][ T0] rest_init+0xec/0xf6 [ 47.851909][ T0] arch_call_rest_init+0x17/0x37 [ 47.856832][ T0] start_kernel+0x83e/0x864 [ 47.861312][ T0] x86_64_start_reservations+0x29/0x2b [ 47.866745][ T0] x86_64_start_kernel+0x72/0x76 [ 47.871657][ T0] secondary_startup_64+0xa4/0xb0 [ 47.876647][ T0] [ 47.878946][ T0] Reported by Kernel Concurrency Sanitizer on: [ 47.885080][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 47.891811][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.901840][ T0] ================================================================== [ 47.909885][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 47.916463][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 47.923192][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.933220][ T0] Call Trace: [ 47.936489][ T0] dump_stack+0xf5/0x159 [ 47.940711][ T0] panic+0x209/0x639 [ 47.944584][ T0] ? secondary_startup_64+0xa4/0xb0 [ 47.949845][ T0] ? vprintk_func+0x8d/0x140 [ 47.954410][ T0] kcsan_report.cold+0xc/0x1b [ 47.959085][ T0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 47.964624][ T0] __tsan_read4+0x2c/0x30 [ 47.968938][ T0] tick_nohz_idle_stop_tick+0x193/0x670 [ 47.974479][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.980701][ T0] do_idle+0x1e0/0x2c0 [ 47.984767][ T0] cpu_startup_entry+0x1b/0x20 [ 47.989642][ T0] rest_init+0xec/0xf6 [ 47.993728][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 48.000908][ T0] arch_call_rest_init+0x17/0x37 [ 48.005829][ T0] start_kernel+0x83e/0x864 [ 48.010312][ T0] x86_64_start_reservations+0x29/0x2b [ 48.015758][ T0] x86_64_start_kernel+0x72/0x76 [ 48.020697][ T0] secondary_startup_64+0xa4/0xb0 [ 48.027120][ T0] Kernel Offset: disabled [ 48.031444][ T0] Rebooting in 86400 seconds..