[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.859811][ T23] audit: type=1800 audit(1570970881.334:25): 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 [ 34.897712][ T23] audit: type=1800 audit(1570970881.334:26): 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 [ 34.925505][ T23] audit: type=1800 audit(1570970881.334:27): 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[ 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 '10.128.0.251' (ECDSA) to the list of known hosts. 2019/10/13 12:48:09 fuzzer started 2019/10/13 12:48:10 dialing manager at 10.128.0.105:40973 2019/10/13 12:48:10 syscalls: 2523 2019/10/13 12:48:10 code coverage: enabled 2019/10/13 12:48:10 comparison tracing: enabled 2019/10/13 12:48:10 extra coverage: extra coverage is not supported by the kernel 2019/10/13 12:48:10 setuid sandbox: enabled 2019/10/13 12:48:10 namespace sandbox: enabled 2019/10/13 12:48:10 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/13 12:48:10 fault injection: enabled 2019/10/13 12:48:10 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/13 12:48:10 net packet injection: enabled 2019/10/13 12:48:10 net device setup: enabled 2019/10/13 12:48:10 concurrency sanitizer: enabled syzkaller login: [ 44.374979][ C0] ================================================================== [ 44.383120][ C0] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 44.392039][ C0] [ 44.394363][ C0] write to 0xffffffff8603f008 of 8 bytes by interrupt on cpu 1: [ 44.401999][ C0] tick_do_update_jiffies64+0x105/0x260 [ 44.407536][ C0] tick_sched_do_timer+0xd4/0xe0 [ 44.412457][ C0] tick_sched_timer+0x43/0xe0 [ 44.417117][ C0] __hrtimer_run_queues+0x288/0x600 [ 44.422308][ C0] hrtimer_interrupt+0x22a/0x480 [ 44.427233][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 44.432670][ C0] apic_timer_interrupt+0xf/0x20 [ 44.437590][ C0] __kcsan_check_watchpoint+0xbb/0x180 [ 44.443817][ C0] __tsan_read8+0x15/0x30 [ 44.448133][ C0] skb_free_head+0x24/0x80 [ 44.452530][ C0] skb_release_data+0x25d/0x3a0 [ 44.457365][ C0] skb_release_all+0x44/0x60 [ 44.461948][ C0] consume_skb+0x92/0x1c0 [ 44.466262][ C0] __dev_kfree_skb_any+0xa3/0xb0 [ 44.471186][ C0] [ 44.473515][ C0] read to 0xffffffff8603f008 of 8 bytes by interrupt on cpu 0: [ 44.481044][ C0] tick_do_update_jiffies64+0x2b/0x260 [ 44.486488][ C0] tick_sched_do_timer+0xd4/0xe0 [ 44.491412][ C0] tick_sched_timer+0x43/0xe0 [ 44.496087][ C0] __hrtimer_run_queues+0x288/0x600 [ 44.501277][ C0] hrtimer_interrupt+0x22a/0x480 [ 44.506205][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 44.511658][ C0] apic_timer_interrupt+0xf/0x20 [ 44.516589][ C0] __sanitizer_cov_trace_pc+0x0/0x50 [ 44.521857][ C0] tcp_add_backlog+0x728/0xcc0 [ 44.526776][ C0] tcp_v4_rcv+0x1aba/0x1bf0 [ 44.531263][ C0] ip_protocol_deliver_rcu+0x51/0x470 [ 44.536620][ C0] ip_local_deliver_finish+0x110/0x140 [ 44.542062][ C0] ip_local_deliver+0x133/0x210 [ 44.546896][ C0] [ 44.549204][ C0] Reported by Kernel Concurrency Sanitizer on: [ 44.555342][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.3.0+ #0 [ 44.562254][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.572293][ C0] ================================================================== [ 44.580353][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 44.586935][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.3.0+ #0 [ 44.593850][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.603893][ C0] Call Trace: [ 44.607160][ C0] [ 44.610014][ C0] dump_stack+0xf5/0x159 [ 44.614247][ C0] panic+0x209/0x639 [ 44.618129][ C0] ? tcp_add_backlog+0x728/0xcc0 [ 44.623051][ C0] ? vprintk_func+0x8d/0x140 [ 44.627631][ C0] kcsan_report.cold+0xc/0x1b [ 44.632311][ C0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 44.637861][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 44.643489][ C0] __tsan_read8+0x2c/0x30 [ 44.647813][ C0] tick_do_update_jiffies64+0x2b/0x260 [ 44.653259][ C0] tick_sched_do_timer+0xd4/0xe0 [ 44.658185][ C0] tick_sched_timer+0x43/0xe0 [ 44.662856][ C0] __hrtimer_run_queues+0x288/0x600 [ 44.668168][ C0] ? tick_sched_do_timer+0xe0/0xe0 [ 44.673281][ C0] hrtimer_interrupt+0x22a/0x480 [ 44.678213][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 44.683657][ C0] apic_timer_interrupt+0xf/0x20 [ 44.688573][ C0] [ 44.691502][ C0] RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 [ 44.697557][ C0] Code: f2 ff 48 c7 c7 88 07 04 86 e8 2c dd 0c 00 48 c7 05 79 11 be 04 00 00 00 00 e9 6a f1 ff ff 90 90 90 90 90 90 90 90 90 90 90 90 <55> 48 89 e5 65 48 8b 04 25 40 6c 01 00 65 8b 15 d4 75 bb 7e 81 e2 [ 44.717141][ C0] RSP: 0018:ffffc90000cb3638 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 44.725539][ C0] RAX: 0000000080000101 RBX: 0000000000000001 RCX: ffffffff83ad97df [ 44.733493][ C0] RDX: 0000000000000001 RSI: 0000000000000001 RDI: 0000000000000005 [ 44.741449][ C0] RBP: ffffc90000cb3720 R08: ffff88812b36b100 R09: 0000c90000cb36eb [ 44.749405][ C0] R10: 00000000aaaaaaab R11: ffffffff86042db0 R12: ffff888124c55000 [ 44.757357][ C0] R13: ffff888124c53b00 R14: ffffc90000cb37bf R15: 00000000000000f0 [ 44.765329][ C0] ? skb_try_coalesce+0x24f/0xbf0 [ 44.770338][ C0] ? skb_try_coalesce+0x8e/0xbf0 [ 44.775260][ C0] ? __tsan_write4+0x32/0x40 [ 44.779832][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 44.785449][ C0] ? __rcu_read_unlock+0x62/0xe0 [ 44.790368][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 44.796000][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 44.801636][ C0] tcp_add_backlog+0x728/0xcc0 [ 44.806399][ C0] tcp_v4_rcv+0x1aba/0x1bf0 [ 44.810889][ C0] ? __tsan_read8+0x2c/0x30 [ 44.815401][ C0] ip_protocol_deliver_rcu+0x51/0x470 [ 44.820942][ C0] ip_local_deliver_finish+0x110/0x140 [ 44.826390][ C0] ip_local_deliver+0x133/0x210 [ 44.831240][ C0] ? ip_protocol_deliver_rcu+0x470/0x470 [ 44.836865][ C0] ip_rcv_finish+0x121/0x160 [ 44.841452][ C0] ip_rcv+0x18f/0x1a0 [ 44.845520][ C0] ? ip_sublist_rcv+0x5e0/0x5e0 [ 44.850356][ C0] ? ip_local_deliver+0x210/0x210 [ 44.855366][ C0] __netif_receive_skb_one_core+0xa7/0xe0 [ 44.861110][ C0] __netif_receive_skb+0x37/0xf0 [ 44.866046][ C0] netif_receive_skb_internal+0x59/0x190 [ 44.871664][ C0] napi_gro_receive+0x28f/0x330 [ 44.876507][ C0] receive_buf+0x284/0x30b0 [ 44.880996][ C0] ? __tsan_write8+0x32/0x40 [ 44.885588][ C0] ? virtqueue_get_buf_ctx+0x4fd/0x5c0 [ 44.891037][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 44.896649][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 44.902269][ C0] virtnet_poll+0x436/0x7d0 [ 44.906761][ C0] net_rx_action+0x3ae/0xa50 [ 44.911346][ C0] __do_softirq+0x115/0x33f [ 44.915871][ C0] ? takeover_tasklets+0x250/0x250 [ 44.920979][ C0] run_ksoftirqd+0x46/0x60 [ 44.925384][ C0] smpboot_thread_fn+0x37d/0x4a0 [ 44.930325][ C0] kthread+0x1d4/0x200 [ 44.934389][ C0] ? constant_test_bit.constprop.0+0x30/0x30 [ 44.940355][ C0] ? kthread_bind+0x50/0x50 [ 44.944859][ C0] ret_from_fork+0x1f/0x30 [ 44.950829][ C0] Kernel Offset: disabled [ 44.955165][ C0] Rebooting in 86400 seconds..