[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.200574][ T25] audit: type=1800 audit(1570902781.479:25): pid=7089 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.220555][ T25] audit: type=1800 audit(1570902781.479:26): pid=7089 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.240550][ T25] audit: type=1800 audit(1570902781.479:27): pid=7089 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 '10.128.0.178' (ECDSA) to the list of known hosts. 2019/10/12 17:53:11 fuzzer started 2019/10/12 17:53:12 dialing manager at 10.128.0.105:43913 2019/10/12 17:53:12 syscalls: 2523 2019/10/12 17:53:12 code coverage: enabled 2019/10/12 17:53:12 comparison tracing: enabled 2019/10/12 17:53:12 extra coverage: extra coverage is not supported by the kernel 2019/10/12 17:53:12 setuid sandbox: enabled 2019/10/12 17:53:12 namespace sandbox: enabled 2019/10/12 17:53:12 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/12 17:53:12 fault injection: enabled 2019/10/12 17:53:12 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/12 17:53:12 net packet injection: enabled 2019/10/12 17:53:12 net device setup: enabled 2019/10/12 17:53:12 concurrency sanitizer: enabled syzkaller login: [ 46.009634][ C0] ================================================================== [ 46.017905][ C0] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 46.026047][ C0] [ 46.028396][ C0] write to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 1: [ 46.036033][ C0] tick_sched_do_timer+0xc0/0xe0 [ 46.040951][ C0] tick_sched_timer+0x43/0xe0 [ 46.045606][ C0] __hrtimer_run_queues+0x288/0x600 [ 46.050783][ C0] hrtimer_interrupt+0x22a/0x480 [ 46.055713][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 46.061156][ C0] apic_timer_interrupt+0xf/0x20 [ 46.066074][ C0] _raw_spin_unlock_irqrestore+0x51/0x80 [ 46.071682][ C0] __wake_up_common_lock+0x85/0xb0 [ 46.076783][ C0] __wake_up_sync_key+0x19/0x20 [ 46.081610][ C0] sock_def_readable+0xa9/0x140 [ 46.086435][ C0] tcp_data_ready+0x7d/0xd0 [ 46.090913][ C0] tcp_rcv_established+0xd0c/0xf50 [ 46.095997][ C0] tcp_v4_do_rcv+0x381/0x4e0 [ 46.100568][ C0] __release_sock+0x135/0x1e0 [ 46.105214][ C0] [ 46.107518][ C0] read to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 0: [ 46.115036][ C0] tick_sched_do_timer+0x33/0xe0 [ 46.119946][ C0] tick_sched_timer+0x43/0xe0 [ 46.124596][ C0] __hrtimer_run_queues+0x288/0x600 [ 46.129785][ C0] hrtimer_interrupt+0x22a/0x480 [ 46.134709][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 46.140144][ C0] apic_timer_interrupt+0xf/0x20 [ 46.145060][ C0] __sanitizer_cov_trace_const_cmp1+0x5/0x20 [ 46.151017][ C0] ipv4_conntrack_in+0x27/0x40 [ 46.155756][ C0] nf_hook_slow+0x83/0x160 [ 46.160147][ C0] ip_rcv+0x12f/0x1a0 [ 46.164114][ C0] __netif_receive_skb_one_core+0xa7/0xe0 [ 46.169805][ C0] __netif_receive_skb+0x37/0xf0 [ 46.174730][ C0] netif_receive_skb_internal+0x59/0x190 [ 46.180336][ C0] [ 46.182638][ C0] Reported by Kernel Concurrency Sanitizer on: [ 46.188767][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.3.0+ #0 [ 46.195668][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.205705][ C0] ================================================================== [ 46.213737][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 46.220298][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.3.0+ #0 [ 46.227201][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.237300][ C0] Call Trace: [ 46.240560][ C0] [ 46.243404][ C0] dump_stack+0xf5/0x159 [ 46.247713][ C0] panic+0x209/0x639 [ 46.251588][ C0] ? nf_hook_slow+0x83/0x160 [ 46.256165][ C0] ? vprintk_func+0x8d/0x140 [ 46.260800][ C0] kcsan_report.cold+0xc/0x1b [ 46.265582][ C0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 46.271107][ C0] __tsan_read4+0x2c/0x30 [ 46.275472][ C0] tick_sched_do_timer+0x33/0xe0 [ 46.280395][ C0] tick_sched_timer+0x43/0xe0 [ 46.285067][ C0] __hrtimer_run_queues+0x288/0x600 [ 46.290421][ C0] ? tick_sched_do_timer+0xe0/0xe0 [ 46.295512][ C0] hrtimer_interrupt+0x22a/0x480 [ 46.300487][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 46.305924][ C0] apic_timer_interrupt+0xf/0x20 [ 46.310832][ C0] [ 46.313838][ C0] RIP: 0010:__sanitizer_cov_trace_const_cmp1+0x5/0x20 [ 46.320580][ C0] Code: 00 00 00 00 00 55 48 89 f2 48 89 fe bf 06 00 00 00 48 89 e5 48 8b 4d 08 e8 18 ff ff ff 5d c3 66 0f 1f 44 00 00 55 40 0f b6 d6 <40> 0f b6 f7 bf 01 00 00 00 48 89 e5 48 8b 4d 08 e8 f6 fe ff ff 5d [ 46.340171][ C0] RSP: 0018:ffffc90000cb3908 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 46.348603][ C0] RAX: ffff88812b36b100 RBX: 0000000000000001 RCX: ffffffff83cfa0bd [ 46.356666][ C0] RDX: 0000000000000001 RSI: 0000000000000001 RDI: 0000000000000000 [ 46.364626][ C0] RBP: ffffc90000cb39c0 R08: ffff88812b36b100 R09: 00008881256acf13 [ 46.372584][ C0] R10: 00000000aaaaaaab R11: ffffffff86042d78 R12: ffff8881256b3c00 [ 46.380542][ C0] R13: ffffc90000cb3a30 R14: ffff88812668f500 R15: 0000000000000001 [ 46.388507][ C0] ? nf_conntrack_in+0x6dd/0xaa0 [ 46.393429][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 46.399736][ C0] ? nf_conntrack_in+0x701/0xaa0 [ 46.404664][ C0] ipv4_conntrack_in+0x27/0x40 [ 46.409404][ C0] nf_hook_slow+0x83/0x160 [ 46.413792][ C0] ? nf_ct_l4proto_find+0xd0/0xd0 [ 46.418794][ C0] ip_rcv+0x12f/0x1a0 [ 46.423535][ C0] ? ip_sublist_rcv+0x5e0/0x5e0 [ 46.428368][ C0] ? ip_local_deliver+0x210/0x210 [ 46.433372][ C0] __netif_receive_skb_one_core+0xa7/0xe0 [ 46.439067][ C0] __netif_receive_skb+0x37/0xf0 [ 46.443980][ C0] netif_receive_skb_internal+0x59/0x190 [ 46.449590][ C0] napi_gro_receive+0x28f/0x330 [ 46.454440][ C0] receive_buf+0x284/0x30b0 [ 46.458925][ C0] ? __tsan_write8+0x32/0x40 [ 46.463497][ C0] ? virtqueue_get_buf_ctx+0x4fd/0x5c0 [ 46.468928][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 46.474533][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 46.480152][ C0] virtnet_poll+0x436/0x7d0 [ 46.484647][ C0] net_rx_action+0x3ae/0xa50 [ 46.489227][ C0] __do_softirq+0x115/0x33f [ 46.493707][ C0] ? takeover_tasklets+0x250/0x250 [ 46.498792][ C0] run_ksoftirqd+0x46/0x60 [ 46.503184][ C0] smpboot_thread_fn+0x37d/0x4a0 [ 46.508108][ C0] kthread+0x1d4/0x200 [ 46.512154][ C0] ? constant_test_bit.constprop.0+0x30/0x30 [ 46.518109][ C0] ? kthread_bind+0x50/0x50 [ 46.522589][ C0] ret_from_fork+0x1f/0x30 [ 46.528654][ C0] Kernel Offset: disabled [ 46.532991][ C0] Rebooting in 86400 seconds..