[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[ 33.743497][ T25] audit: type=1800 audit(1570346353.382:25): pid=7022 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[ 33.787858][ T25] audit: type=1800 audit(1570346353.382:26): pid=7022 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0
[ 33.813853][ T25] audit: type=1800 audit(1570346353.382:27): pid=7022 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[1G[[32m ok [39;49m8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
Debian GNU/Linux 7 syzkaller ttyS0
Warning: Permanently added '10.128.10.39' (ECDSA) to the list of known hosts.
2019/10/06 07:19:27 fuzzer started
2019/10/06 07:19:28 dialing manager at 10.128.0.105:35709
2019/10/06 07:19:28 syscalls: 2523
2019/10/06 07:19:28 code coverage: enabled
2019/10/06 07:19:28 comparison tracing: enabled
2019/10/06 07:19:28 extra coverage: extra coverage is not supported by the kernel
2019/10/06 07:19:28 setuid sandbox: enabled
2019/10/06 07:19:28 namespace sandbox: enabled
2019/10/06 07:19:28 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/06 07:19:28 fault injection: enabled
2019/10/06 07:19:28 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/06 07:19:28 net packet injection: enabled
2019/10/06 07:19:28 net device setup: enabled
2019/10/06 07:19:28 concurrency sanitizer: enabled
syzkaller login: [ 48.999152][ C0] ==================================================================
[ 49.007331][ C0] BUG: KCSAN: data-race in timer_clear_idle / trigger_dyntick_cpu.isra.0
[ 49.015729][ C0]
[ 49.018051][ C0] write to 0xffff88812bf1b6e4 of 1 bytes by task 0 on cpu 1:
[ 49.025401][ C0] timer_clear_idle+0x42/0x50
[ 49.030058][ C0] __tick_nohz_idle_restart_tick+0x36/0x1b0
[ 49.035932][ C0] tick_nohz_idle_exit+0x1af/0x1e0
[ 49.041026][ C0] do_idle+0xb0/0x2c0
[ 49.044988][ C0] cpu_startup_entry+0x1b/0x20
[ 49.049732][ C0] start_secondary+0x207/0x260
[ 49.054476][ C0] secondary_startup_64+0xa4/0xb0
[ 49.059470][ C0]
[ 49.061782][ C0] read to 0xffff88812bf1b6e4 of 1 bytes by interrupt on cpu 0:
[ 49.069305][ C0] trigger_dyntick_cpu.isra.0+0x75/0x100
[ 49.074918][ C0] mod_timer+0x312/0x7a0
[ 49.079142][ C0] sk_reset_timer+0x2d/0x70
[ 49.083633][ C0] tcp_send_delayed_ack+0x21d/0x2b0
[ 49.088814][ C0] __tcp_ack_snd_check+0x3c8/0x4e0
[ 49.093904][ C0] tcp_rcv_established+0x750/0xf50
[ 49.099021][ C0] tcp_v4_do_rcv+0x381/0x4e0
[ 49.103593][ C0] tcp_v4_rcv+0x1a03/0x1bf0
[ 49.108080][ C0] ip_protocol_deliver_rcu+0x51/0x470
[ 49.113435][ C0] ip_local_deliver_finish+0x110/0x140
[ 49.118886][ C0] ip_local_deliver+0x133/0x210
[ 49.123718][ C0] ip_rcv_finish+0x121/0x160
[ 49.128286][ C0] ip_rcv+0x18f/0x1a0
[ 49.132241][ C0]
[ 49.134548][ C0] Reported by Kernel Concurrency Sanitizer on:
[ 49.140683][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0
[ 49.147417][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 49.157457][ C0] ==================================================================
[ 49.165506][ C0] Kernel panic - not syncing: panic_on_warn set ...
[ 49.172081][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0
[ 49.178823][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 49.188857][ C0] Call Trace:
[ 49.192121][ C0]
[ 49.194979][ C0] dump_stack+0xf5/0x159
[ 49.199209][ C0] panic+0x209/0x639
[ 49.203093][ C0] ? vprintk_func+0x8d/0x140
[ 49.207670][ C0] kcsan_report.cold+0x57/0xeb
[ 49.212437][ C0] __kcsan_setup_watchpoint+0x342/0x500
[ 49.217967][ C0] __tsan_read1+0x2c/0x30
[ 49.222285][ C0] trigger_dyntick_cpu.isra.0+0x75/0x100
[ 49.227904][ C0] mod_timer+0x312/0x7a0
[ 49.232135][ C0] ? __rcu_read_unlock+0x62/0xe0
[ 49.237065][ C0] sk_reset_timer+0x2d/0x70
[ 49.241579][ C0] tcp_send_delayed_ack+0x21d/0x2b0
[ 49.246778][ C0] __tcp_ack_snd_check+0x3c8/0x4e0
[ 49.251876][ C0] tcp_rcv_established+0x750/0xf50
[ 49.256973][ C0] ? ipv4_dst_check+0xc6/0xf0
[ 49.261648][ C0] tcp_v4_do_rcv+0x381/0x4e0
[ 49.266222][ C0] tcp_v4_rcv+0x1a03/0x1bf0
[ 49.270705][ C0] ? __tsan_read8+0x2c/0x30
[ 49.275200][ C0] ip_protocol_deliver_rcu+0x51/0x470
[ 49.280558][ C0] ip_local_deliver_finish+0x110/0x140
[ 49.286001][ C0] ip_local_deliver+0x133/0x210
[ 49.290838][ C0] ? ip_protocol_deliver_rcu+0x470/0x470
[ 49.296455][ C0] ip_rcv_finish+0x121/0x160
[ 49.301030][ C0] ip_rcv+0x18f/0x1a0
[ 49.305001][ C0] ? ip_sublist_rcv+0x5e0/0x5e0
[ 49.309832][ C0] ? ip_local_deliver+0x210/0x210
[ 49.314841][ C0] __netif_receive_skb_one_core+0xa7/0xe0
[ 49.320548][ C0] __netif_receive_skb+0x37/0xf0
[ 49.325473][ C0] netif_receive_skb_internal+0x59/0x190
[ 49.331092][ C0] napi_gro_receive+0x28f/0x330
[ 49.335932][ C0] receive_buf+0x284/0x30b0
[ 49.340419][ C0] ? __tsan_write8+0x32/0x40
[ 49.345003][ C0] ? virtqueue_get_buf_ctx+0x4fd/0x5c0
[ 49.350450][ C0] virtnet_poll+0x436/0x7d0
[ 49.354946][ C0] net_rx_action+0x3ae/0xa50
[ 49.359528][ C0] __do_softirq+0x115/0x33f
[ 49.364019][ C0] irq_exit+0xbb/0xe0
[ 49.367985][ C0] do_IRQ+0xdf/0x150
[ 49.371866][ C0] common_interrupt+0xf/0xf
[ 49.376345][ C0]
[ 49.379272][ C0] RIP: 0010:native_safe_halt+0xe/0x10
[ 49.384629][ C0] Code: 90 90 90 90 90 90 90 90 90 90 90 90 e9 07 00 00 00 0f 00 2d 8c d2 4e 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 7c d2 4e 00 fb f4 90 55 48 89 e5 41 55 41 54 53 e8 82 78 a7 fc e8 5d 4e b9 fd 0f
[ 49.404217][ C0] RSP: 0018:ffffffff85a03de0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffffda
[ 49.412611][ C0] RAX: 72b020c49ba602fc RBX: 0000000000000000 RCX: 0000000000000387
[ 49.420651][ C0] RDX: 00000000001b7740 RSI: 020c49ba5e353f7d RDI: ffffffff85a55a28
[ 49.428604][ C0] RBP: ffffffff85a03e18 R08: 0000000000000000 R09: 0000ffff85a55a2f
[ 49.436559][ C0] R10: 00000000aaaaaaab R11: ffffffff86042cc0 R12: ffffffff85a2b780
[ 49.444513][ C0] R13: ffffffff85a2b780 R14: 0000000000000000 R15: 0000000000000000
[ 49.452482][ C0] ? default_idle+0x50/0x230
[ 49.457057][ C0] arch_cpu_idle+0x1f/0x30
[ 49.461462][ C0] default_idle_call+0x1e/0x40
[ 49.466209][ C0] do_idle+0x1ea/0x2c0
[ 49.470273][ C0] cpu_startup_entry+0x1b/0x20
[ 49.475031][ C0] rest_init+0xec/0xf6
[ 49.479090][ C0] ? trace_event_define_fields_vector_free_moved+0xce/0xce
[ 49.486268][ C0] arch_call_rest_init+0x17/0x37
[ 49.491188][ C0] start_kernel+0x83e/0x864
[ 49.495677][ C0] x86_64_start_reservations+0x29/0x2b
[ 49.501118][ C0] x86_64_start_kernel+0x72/0x76
[ 49.506037][ C0] secondary_startup_64+0xa4/0xb0
[ 49.512280][ C0] Kernel Offset: disabled
[ 49.516650][ C0] Rebooting in 86400 seconds..