[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 37.343729][ T25] audit: type=1800 audit(1571046591.183:25): pid=7100 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 37.380689][ T25] audit: type=1800 audit(1571046591.183:26): pid=7100 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 37.400691][ T25] audit: type=1800 audit(1571046591.183:27): pid=7100 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 '10.128.0.145' (ECDSA) to the list of known hosts. 2019/10/14 09:49:59 fuzzer started 2019/10/14 09:50:00 dialing manager at 10.128.0.105:43961 2019/10/14 09:50:00 syscalls: 2523 2019/10/14 09:50:00 code coverage: enabled 2019/10/14 09:50:00 comparison tracing: enabled 2019/10/14 09:50:00 extra coverage: extra coverage is not supported by the kernel 2019/10/14 09:50:00 setuid sandbox: enabled 2019/10/14 09:50:00 namespace sandbox: enabled 2019/10/14 09:50:00 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/14 09:50:00 fault injection: enabled 2019/10/14 09:50:00 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/14 09:50:00 net packet injection: enabled 2019/10/14 09:50:00 net device setup: enabled 2019/10/14 09:50:00 concurrency sanitizer: enabled syzkaller login: [ 46.965432][ C1] ================================================================== [ 46.973566][ C1] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 46.981606][ C1] [ 46.983929][ C1] read to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 0: [ 46.991496][ C1] tick_sched_do_timer+0x33/0xe0 [ 46.996418][ C1] tick_sched_timer+0x43/0xe0 [ 47.001103][ C1] __hrtimer_run_queues+0x288/0x600 [ 47.006287][ C1] hrtimer_interrupt+0x22a/0x480 [ 47.011209][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 47.016748][ C1] apic_timer_interrupt+0xf/0x20 [ 47.021670][ C1] native_safe_halt+0xe/0x10 [ 47.026245][ C1] arch_cpu_idle+0x1f/0x30 [ 47.030647][ C1] default_idle_call+0x1e/0x40 [ 47.035408][ C1] do_idle+0x1ea/0x2c0 [ 47.039466][ C1] cpu_startup_entry+0x1b/0x20 [ 47.044299][ C1] rest_init+0xec/0xf6 [ 47.048363][ C1] arch_call_rest_init+0x17/0x37 [ 47.053286][ C1] start_kernel+0x83e/0x864 [ 47.057763][ C1] [ 47.060078][ C1] write to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 1: [ 47.067693][ C1] tick_sched_do_timer+0xc0/0xe0 [ 47.072614][ C1] tick_sched_timer+0x43/0xe0 [ 47.077278][ C1] __hrtimer_run_queues+0x288/0x600 [ 47.082470][ C1] hrtimer_interrupt+0x22a/0x480 [ 47.087391][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 47.092830][ C1] apic_timer_interrupt+0xf/0x20 [ 47.097754][ C1] _raw_spin_unlock_irqrestore+0x51/0x80 [ 47.103371][ C1] __wake_up_common_lock+0x85/0xb0 [ 47.108476][ C1] __wake_up_sync_key+0x19/0x20 [ 47.113342][ C1] sock_def_readable+0xa9/0x140 [ 47.118272][ C1] tcp_data_ready+0x7d/0xd0 [ 47.123022][ C1] tcp_rcv_established+0xd0c/0xf50 [ 47.128117][ C1] tcp_v4_do_rcv+0x381/0x4e0 [ 47.132684][ C1] [ 47.134991][ C1] Reported by Kernel Concurrency Sanitizer on: [ 47.141137][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.3.0+ #0 [ 47.148137][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.158175][ C1] ================================================================== [ 47.166216][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 47.172808][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.3.0+ #0 [ 47.179848][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.189885][ C1] Call Trace: [ 47.193152][ C1] [ 47.196012][ C1] dump_stack+0xf5/0x159 [ 47.200243][ C1] panic+0x209/0x639 [ 47.204125][ C1] ? __wake_up_sync_key+0x19/0x20 [ 47.209134][ C1] ? vprintk_func+0x8d/0x140 [ 47.213723][ C1] kcsan_report.cold+0xc/0x1b [ 47.218398][ C1] __kcsan_setup_watchpoint+0x3ee/0x510 [ 47.223930][ C1] __tsan_write4+0x32/0x40 [ 47.228333][ C1] tick_sched_do_timer+0xc0/0xe0 [ 47.233264][ C1] tick_sched_timer+0x43/0xe0 [ 47.237933][ C1] __hrtimer_run_queues+0x288/0x600 [ 47.243120][ C1] ? tick_sched_do_timer+0xe0/0xe0 [ 47.248219][ C1] hrtimer_interrupt+0x22a/0x480 [ 47.253160][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 47.258605][ C1] apic_timer_interrupt+0xf/0x20 [ 47.263607][ C1] [ 47.266541][ C1] RIP: 0010:_raw_spin_unlock_irqrestore+0x51/0x80 [ 47.272941][ C1] Code: 11 01 00 74 49 48 89 df c6 07 00 0f 1f 40 00 48 c7 c7 10 5a a5 85 e8 6e 31 bf fc 48 83 3d 76 b8 11 01 00 74 2b 4c 89 e7 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 00 6f a0 fc 65 8b 05 51 ca 6d 7b [ 47.292527][ C1] RSP: 0018:ffffc90000cf3620 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 [ 47.300922][ C1] RAX: f5c28f5c28f5ef08 RBX: ffff888125fbf3c0 RCX: 0000000000000784 [ 47.308874][ C1] RDX: 0000000000269300 RSI: 020c49ba5e353f7d RDI: 0000000000000282 [ 47.316830][ C1] RBP: ffffc90000cf3630 R08: 0000000000000000 R09: 0000ffff85a55a17 [ 47.324785][ C1] R10: 00000000aaaaaaab R11: ffffffff86042cc0 R12: 0000000000000282 [ 47.332740][ C1] R13: 0000000000000282 R14: 0000000000000001 R15: 0000000000000001 [ 47.340736][ C1] __wake_up_common_lock+0x85/0xb0 [ 47.345841][ C1] __wake_up_sync_key+0x19/0x20 [ 47.350684][ C1] sock_def_readable+0xa9/0x140 [ 47.355528][ C1] tcp_data_ready+0x7d/0xd0 [ 47.360030][ C1] tcp_rcv_established+0xd0c/0xf50 [ 47.365133][ C1] ? ipv4_dst_check+0xc6/0xf0 [ 47.369808][ C1] tcp_v4_do_rcv+0x381/0x4e0 [ 47.374383][ C1] tcp_v4_rcv+0x1a03/0x1bf0 [ 47.378873][ C1] ? __tsan_read8+0x2c/0x30 [ 47.383366][ C1] ip_protocol_deliver_rcu+0x51/0x470 [ 47.388726][ C1] ip_local_deliver_finish+0x110/0x140 [ 47.394187][ C1] ip_local_deliver+0x133/0x210 [ 47.399049][ C1] ? ip_protocol_deliver_rcu+0x470/0x470 [ 47.404790][ C1] ip_rcv_finish+0x121/0x160 [ 47.409461][ C1] ip_rcv+0x18f/0x1a0 [ 47.413692][ C1] ? ip_sublist_rcv+0x5e0/0x5e0 [ 47.418531][ C1] ? ip_local_deliver+0x210/0x210 [ 47.423568][ C1] __netif_receive_skb_one_core+0xa7/0xe0 [ 47.429364][ C1] __netif_receive_skb+0x37/0xf0 [ 47.434318][ C1] netif_receive_skb_internal+0x59/0x190 [ 47.439949][ C1] napi_gro_receive+0x28f/0x330 [ 47.444795][ C1] receive_buf+0x284/0x30b0 [ 47.449288][ C1] ? __tsan_write8+0x32/0x40 [ 47.453873][ C1] ? virtqueue_get_buf_ctx+0x4fd/0x5c0 [ 47.459314][ C1] ? __kcsan_setup_watchpoint+0x96/0x510 [ 47.464941][ C1] ? __kcsan_setup_watchpoint+0x96/0x510 [ 47.470565][ C1] virtnet_poll+0x436/0x7d0 [ 47.475058][ C1] net_rx_action+0x3ae/0xa50 [ 47.479643][ C1] __do_softirq+0x115/0x33f [ 47.484140][ C1] ? takeover_tasklets+0x250/0x250 [ 47.489237][ C1] run_ksoftirqd+0x46/0x60 [ 47.493637][ C1] smpboot_thread_fn+0x37d/0x4a0 [ 47.498566][ C1] kthread+0x1d4/0x200 [ 47.502618][ C1] ? constant_test_bit.constprop.0+0x30/0x30 [ 47.508577][ C1] ? kthread_bind+0x50/0x50 [ 47.513068][ C1] ret_from_fork+0x1f/0x30 [ 47.518863][ C1] Kernel Offset: disabled [ 47.523211][ C1] Rebooting in 86400 seconds..