[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[ 34.646970][ T25] audit: type=1800 audit(1570468520.310:25): pid=7080 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[ 34.674572][ T25] audit: type=1800 audit(1570468520.310:26): pid=7080 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0
[ 34.710680][ T25] audit: type=1800 audit(1570468520.310:27): pid=7080 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 '10.128.0.209' (ECDSA) to the list of known hosts.
2019/10/07 17:15:32 fuzzer started
2019/10/07 17:15:33 dialing manager at 10.128.0.105:39369
2019/10/07 17:15:33 syscalls: 2523
2019/10/07 17:15:33 code coverage: enabled
2019/10/07 17:15:33 comparison tracing: enabled
2019/10/07 17:15:33 extra coverage: extra coverage is not supported by the kernel
2019/10/07 17:15:33 setuid sandbox: enabled
2019/10/07 17:15:33 namespace sandbox: enabled
2019/10/07 17:15:33 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/07 17:15:33 fault injection: enabled
2019/10/07 17:15:33 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/07 17:15:33 net packet injection: enabled
2019/10/07 17:15:33 net device setup: enabled
2019/10/07 17:15:33 concurrency sanitizer: enabled
syzkaller login: [ 47.588438][ C1] ==================================================================
[ 47.596620][ C1] BUG: KCSAN: data-race in mod_timer / timer_clear_idle
[ 47.603531][ C1]
[ 47.605843][ C1] write to 0xffff88812be1b6e4 of 1 bytes by task 0 on cpu 0:
[ 47.613198][ C1] timer_clear_idle+0x42/0x50
[ 47.617881][ C1] __tick_nohz_idle_restart_tick+0x36/0x1b0
[ 47.623756][ C1] tick_nohz_idle_exit+0x1af/0x1e0
[ 47.628855][ C1] do_idle+0xb0/0x2c0
[ 47.632820][ C1] cpu_startup_entry+0x1b/0x20
[ 47.637572][ C1] rest_init+0xec/0xf6
[ 47.641629][ C1] arch_call_rest_init+0x17/0x37
[ 47.646555][ C1] start_kernel+0x83e/0x864
[ 47.651045][ C1] x86_64_start_reservations+0x29/0x2b
[ 47.656487][ C1] x86_64_start_kernel+0x72/0x76
[ 47.661451][ C1] secondary_startup_64+0xa4/0xb0
[ 47.666449][ C1]
[ 47.668760][ C1] read to 0xffff88812be1b6e4 of 1 bytes by interrupt on cpu 1:
[ 47.676284][ C1] mod_timer+0x6b5/0x7a0
[ 47.680511][ C1] sk_reset_timer+0x2d/0x70
[ 47.685100][ C1] tcp_send_delayed_ack+0x21d/0x2b0
[ 47.690303][ C1] __tcp_ack_snd_check+0x3c8/0x4e0
[ 47.695402][ C1] tcp_rcv_established+0x750/0xf50
[ 47.700508][ C1] tcp_v4_do_rcv+0x381/0x4e0
[ 47.705093][ C1] tcp_v4_rcv+0x1a03/0x1bf0
[ 47.709578][ C1] ip_protocol_deliver_rcu+0x51/0x470
[ 47.714934][ C1] ip_local_deliver_finish+0x110/0x140
[ 47.720376][ C1] ip_local_deliver+0x133/0x210
[ 47.725207][ C1] ip_rcv_finish+0x121/0x160
[ 47.729776][ C1] ip_rcv+0x18f/0x1a0
[ 47.733742][ C1] __netif_receive_skb_one_core+0xa7/0xe0
[ 47.739432][ C1]
[ 47.741747][ C1] Reported by Kernel Concurrency Sanitizer on:
[ 47.747906][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0
[ 47.754649][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 47.764694][ C1] ==================================================================
[ 47.772775][ C1] Kernel panic - not syncing: panic_on_warn set ...
[ 47.779359][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0
[ 47.786100][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 47.796139][ C1] Call Trace:
[ 47.799409][ C1]
[ 47.802251][ C1] dump_stack+0xf5/0x159
[ 47.806487][ C1] panic+0x209/0x639
[ 47.810380][ C1] ? vprintk_func+0x8d/0x140
[ 47.814956][ C1] kcsan_report.cold+0x57/0xeb
[ 47.819716][ C1] __kcsan_setup_watchpoint+0x342/0x500
[ 47.825245][ C1] __tsan_read1+0x2c/0x30
[ 47.829559][ C1] mod_timer+0x6b5/0x7a0
[ 47.833798][ C1] ? __rcu_read_unlock+0x62/0xe0
[ 47.838723][ C1] ? sock_def_readable+0xda/0x140
[ 47.843734][ C1] sk_reset_timer+0x2d/0x70
[ 47.848228][ C1] tcp_send_delayed_ack+0x21d/0x2b0
[ 47.853410][ C1] __tcp_ack_snd_check+0x3c8/0x4e0
[ 47.858511][ C1] tcp_rcv_established+0x750/0xf50
[ 47.863611][ C1] ? ipv4_dst_check+0xc6/0xf0
[ 47.868271][ C1] tcp_v4_do_rcv+0x381/0x4e0
[ 47.872844][ C1] tcp_v4_rcv+0x1a03/0x1bf0
[ 47.877346][ C1] ? __tsan_read8+0x2c/0x30
[ 47.881841][ C1] ip_protocol_deliver_rcu+0x51/0x470
[ 47.887207][ C1] ip_local_deliver_finish+0x110/0x140
[ 47.892650][ C1] ip_local_deliver+0x133/0x210
[ 47.898447][ C1] ? ip_protocol_deliver_rcu+0x470/0x470
[ 47.904063][ C1] ip_rcv_finish+0x121/0x160
[ 47.908641][ C1] ip_rcv+0x18f/0x1a0
[ 47.912607][ C1] ? ip_sublist_rcv+0x5e0/0x5e0
[ 47.917438][ C1] ? ip_local_deliver+0x210/0x210
[ 47.922450][ C1] __netif_receive_skb_one_core+0xa7/0xe0
[ 47.928156][ C1] __netif_receive_skb+0x37/0xf0
[ 47.933089][ C1] netif_receive_skb_internal+0x59/0x190
[ 47.938709][ C1] napi_gro_receive+0x28f/0x330
[ 47.943549][ C1] receive_buf+0x284/0x30b0
[ 47.948052][ C1] ? __tsan_write8+0x32/0x40
[ 47.952646][ C1] ? virtqueue_get_buf_ctx+0x4fd/0x5c0
[ 47.958089][ C1] ? virtqueue_get_buf+0x31/0x40
[ 47.963023][ C1] virtnet_poll+0x436/0x7d0
[ 47.967528][ C1] net_rx_action+0x3ae/0xa50
[ 47.972109][ C1] __do_softirq+0x115/0x33f
[ 47.976602][ C1] irq_exit+0xbb/0xe0
[ 47.980567][ C1] do_IRQ+0xdf/0x150
[ 47.984448][ C1] common_interrupt+0xf/0xf
[ 47.988927][ C1]
[ 47.991871][ C1] RIP: 0010:native_safe_halt+0xe/0x10
[ 47.997228][ C1] 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
[ 48.016812][ C1] RSP: 0018:ffffc90000cd3e48 EFLAGS: 00000282 ORIG_RAX: ffffffffffffffde
[ 48.025208][ C1] RAX: c28f5c28f5c2a421 RBX: 0000000000000001 RCX: 00000000000005fb
[ 48.033165][ C1] RDX: 0000000000120160 RSI: 020c49ba5e353f7d RDI: ffffffff85a55a28
[ 48.041118][ C1] RBP: ffffc90000cd3e80 R08: 0000000000000000 R09: 0000ffff85a55a2f
[ 48.049227][ C1] R10: 00000000aaaaaaab R11: ffffffff86042cc0 R12: ffff88812b38b0c0
[ 48.057192][ C1] R13: ffff88812b38b0c0 R14: 0000000000000000 R15: 0000000000000000
[ 48.065162][ C1] ? default_idle+0x50/0x230
[ 48.069740][ C1] arch_cpu_idle+0x1f/0x30
[ 48.074151][ C1] default_idle_call+0x1e/0x40
[ 48.078910][ C1] do_idle+0x1ea/0x2c0
[ 48.082971][ C1] ? complete+0x44/0x50
[ 48.087125][ C1] cpu_startup_entry+0x1b/0x20
[ 48.091873][ C1] start_secondary+0x207/0x260
[ 48.096626][ C1] secondary_startup_64+0xa4/0xb0
[ 48.102996][ C1] Kernel Offset: disabled
[ 48.107329][ C1] Rebooting in 86400 seconds..