[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.259031][ T26] audit: type=1800 audit(1571157802.554:25): pid=7056 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.282531][ T26] audit: type=1800 audit(1571157802.554:26): pid=7056 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.312064][ T26] audit: type=1800 audit(1571157802.564:27): pid=7056 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 '10.128.1.24' (ECDSA) to the list of known hosts. 2019/10/15 16:43:32 fuzzer started 2019/10/15 16:43:34 dialing manager at 10.128.0.105:38903 2019/10/15 16:43:34 syscalls: 2523 2019/10/15 16:43:34 code coverage: enabled 2019/10/15 16:43:34 comparison tracing: enabled 2019/10/15 16:43:34 extra coverage: extra coverage is not supported by the kernel 2019/10/15 16:43:34 setuid sandbox: enabled 2019/10/15 16:43:34 namespace sandbox: enabled 2019/10/15 16:43:34 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/15 16:43:34 fault injection: enabled 2019/10/15 16:43:34 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/15 16:43:34 net packet injection: enabled 2019/10/15 16:43:34 net device setup: enabled 2019/10/15 16:43:34 concurrency sanitizer: enabled syzkaller login: [ 46.732836][ C1] ================================================================== [ 46.741100][ C1] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 46.750047][ C1] [ 46.752352][ C1] write to 0xffffffff8603f008 of 8 bytes by interrupt on cpu 0: [ 46.759956][ C1] tick_do_update_jiffies64+0x105/0x260 [ 46.765476][ C1] tick_sched_do_timer+0xd4/0xe0 [ 46.770389][ C1] tick_sched_timer+0x43/0xe0 [ 46.775047][ C1] __hrtimer_run_queues+0x288/0x600 [ 46.780219][ C1] hrtimer_interrupt+0x22a/0x480 [ 46.785130][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 46.790614][ C1] apic_timer_interrupt+0xf/0x20 [ 46.795521][ C1] [ 46.797825][ C1] read to 0xffffffff8603f008 of 8 bytes by interrupt on cpu 1: [ 46.805357][ C1] tick_do_update_jiffies64+0x2b/0x260 [ 46.810799][ C1] tick_sched_do_timer+0xd4/0xe0 [ 46.815723][ C1] tick_sched_timer+0x43/0xe0 [ 46.820388][ C1] __hrtimer_run_queues+0x288/0x600 [ 46.825579][ C1] hrtimer_interrupt+0x22a/0x480 [ 46.830505][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 46.835938][ C1] apic_timer_interrupt+0xf/0x20 [ 46.840852][ C1] __kcsan_check_watchpoint+0xb3/0x180 [ 46.846284][ C1] __tsan_read1+0x15/0x30 [ 46.850605][ C1] tcp_v4_early_demux+0x28f/0x400 [ 46.855608][ C1] ip_rcv_finish_core.isra.0+0x2f1/0xaf0 [ 46.861230][ C1] ip_rcv_finish+0xe5/0x160 [ 46.865723][ C1] ip_rcv+0x18f/0x1a0 [ 46.869671][ C1] [ 46.871973][ C1] Reported by Kernel Concurrency Sanitizer on: [ 46.878100][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.3.0+ #0 [ 46.885091][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.895120][ C1] ================================================================== [ 46.903164][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 46.909734][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.3.0+ #0 [ 46.916819][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.926859][ C1] Call Trace: [ 46.930118][ C1] [ 46.932957][ C1] dump_stack+0xf5/0x159 [ 46.937183][ C1] panic+0x209/0x639 [ 46.941058][ C1] ? __tsan_read1+0x15/0x30 [ 46.945541][ C1] ? vprintk_func+0x8d/0x140 [ 46.950111][ C1] kcsan_report.cold+0xc/0x1b [ 46.954785][ C1] __kcsan_setup_watchpoint+0x3ee/0x510 [ 46.960310][ C1] ? __kcsan_setup_watchpoint+0x96/0x510 [ 46.965923][ C1] __tsan_read8+0x2c/0x30 [ 46.970233][ C1] tick_do_update_jiffies64+0x2b/0x260 [ 46.975669][ C1] tick_sched_do_timer+0xd4/0xe0 [ 46.980583][ C1] tick_sched_timer+0x43/0xe0 [ 46.985241][ C1] __hrtimer_run_queues+0x288/0x600 [ 46.990416][ C1] ? tick_sched_do_timer+0xe0/0xe0 [ 46.995607][ C1] hrtimer_interrupt+0x22a/0x480 [ 47.000527][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 47.005975][ C1] apic_timer_interrupt+0xf/0x20 [ 47.010895][ C1] [ 47.013826][ C1] RIP: 0010:__kcsan_check_watchpoint+0xb3/0x180 [ 47.020057][ C1] Code: c1 e8 21 8d 04 40 29 c3 8d 44 1e ff 41 89 c3 41 c1 fb 1f 41 c1 eb 1a 44 01 d8 83 e0 3f 44 29 d8 48 98 4c 8d 1c c5 20 2c 04 86 <48> 8b 04 c5 20 2c 04 86 48 83 f8 01 76 2c 48 89 c3 49 89 c7 48 c1 [ 47.040023][ C1] RSP: 0018:ffffc90000cf38c8 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 47.048410][ C1] RAX: 000000000000000b RBX: 0000000000000000 RCX: 0000ffffffffffff [ 47.056356][ C1] RDX: 0000000000000003 RSI: 000000000000000c RDI: 0000888124ecc052 [ 47.064314][ C1] RBP: ffffc90000cf38f0 R08: 0000000000000000 R09: 0000888124ecc052 [ 47.072271][ C1] R10: 00000000aaaaaaab R11: ffffffff86042c78 R12: 0000000000000000 [ 47.080220][ C1] R13: ffff888124ecc052 R14: 0000000000000001 R15: ffff888125ff5a90 [ 47.088234][ C1] __tsan_read1+0x15/0x30 [ 47.092575][ C1] tcp_v4_early_demux+0x28f/0x400 [ 47.097580][ C1] ? tcp_v4_send_synack+0x170/0x170 [ 47.102765][ C1] ip_rcv_finish_core.isra.0+0x2f1/0xaf0 [ 47.108382][ C1] ? __kcsan_setup_watchpoint+0x96/0x510 [ 47.114003][ C1] ? __kcsan_setup_watchpoint+0x96/0x510 [ 47.119620][ C1] ? tcp_v4_send_synack+0x170/0x170 [ 47.124806][ C1] ip_rcv_finish+0xe5/0x160 [ 47.129287][ C1] ip_rcv+0x18f/0x1a0 [ 47.133245][ C1] ? ip_sublist_rcv+0x5e0/0x5e0 [ 47.138094][ C1] ? ip_local_deliver+0x210/0x210 [ 47.143099][ C1] __netif_receive_skb_one_core+0xa7/0xe0 [ 47.148792][ C1] __netif_receive_skb+0x37/0xf0 [ 47.153708][ C1] netif_receive_skb_internal+0x59/0x190 [ 47.159315][ C1] napi_gro_receive+0x28f/0x330 [ 47.164144][ C1] receive_buf+0x284/0x30b0 [ 47.168635][ C1] ? __tsan_write8+0x32/0x40 [ 47.173209][ C1] ? virtqueue_get_buf_ctx+0x4fd/0x5c0 [ 47.178656][ C1] ? __kcsan_setup_watchpoint+0x96/0x510 [ 47.184283][ C1] ? __kcsan_setup_watchpoint+0x96/0x510 [ 47.189908][ C1] virtnet_poll+0x436/0x7d0 [ 47.194391][ C1] ? __queue_work+0x910/0x910 [ 47.199049][ C1] net_rx_action+0x3ae/0xa50 [ 47.203618][ C1] __do_softirq+0x115/0x33f [ 47.208104][ C1] ? takeover_tasklets+0x250/0x250 [ 47.213212][ C1] run_ksoftirqd+0x46/0x60 [ 47.217603][ C1] smpboot_thread_fn+0x37d/0x4a0 [ 47.222515][ C1] kthread+0x1d4/0x200 [ 47.226561][ C1] ? constant_test_bit.constprop.0+0x30/0x30 [ 47.232515][ C1] ? kthread_bind+0x50/0x50 [ 47.236993][ C1] ret_from_fork+0x1f/0x30 [ 47.242638][ C1] Kernel Offset: disabled [ 47.246955][ C1] Rebooting in 86400 seconds..