[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.840733][ T25] audit: type=1800 audit(1570947969.505:25): pid=7088 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.885693][ T25] audit: type=1800 audit(1570947969.505:26): pid=7088 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.909017][ T25] audit: type=1800 audit(1570947969.505:27): pid=7088 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 '10.128.1.50' (ECDSA) to the list of known hosts. 2019/10/13 06:26:20 fuzzer started 2019/10/13 06:26:21 dialing manager at 10.128.0.105:43913 2019/10/13 06:26:21 syscalls: 2523 2019/10/13 06:26:21 code coverage: enabled 2019/10/13 06:26:21 comparison tracing: enabled 2019/10/13 06:26:21 extra coverage: extra coverage is not supported by the kernel 2019/10/13 06:26:21 setuid sandbox: enabled 2019/10/13 06:26:21 namespace sandbox: enabled 2019/10/13 06:26:21 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/13 06:26:21 fault injection: enabled 2019/10/13 06:26:21 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/13 06:26:21 net packet injection: enabled 2019/10/13 06:26:21 net device setup: enabled 2019/10/13 06:26:21 concurrency sanitizer: enabled syzkaller login: [ 49.598054][ C0] ================================================================== [ 49.606281][ C0] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 49.615180][ C0] [ 49.617495][ C0] write to 0xffffffff8603f008 of 8 bytes by task 0 on cpu 1: [ 49.624837][ C0] tick_do_update_jiffies64+0x105/0x260 [ 49.630354][ C0] tick_irq_enter+0x139/0x1c0 [ 49.635004][ C0] irq_enter+0x4f/0x60 [ 49.639050][ C0] smp_apic_timer_interrupt+0x55/0x280 [ 49.644478][ C0] apic_timer_interrupt+0xf/0x20 [ 49.649392][ C0] native_safe_halt+0xe/0x10 [ 49.653992][ C0] arch_cpu_idle+0x1f/0x30 [ 49.658390][ C0] default_idle_call+0x1e/0x40 [ 49.663128][ C0] do_idle+0x1ea/0x2c0 [ 49.667167][ C0] cpu_startup_entry+0x1b/0x20 [ 49.671905][ C0] start_secondary+0x207/0x260 [ 49.676641][ C0] secondary_startup_64+0xa4/0xb0 [ 49.681655][ C0] [ 49.683961][ C0] read to 0xffffffff8603f008 of 8 bytes by interrupt on cpu 0: [ 49.691478][ C0] tick_do_update_jiffies64+0x2b/0x260 [ 49.696942][ C0] tick_sched_do_timer+0xd4/0xe0 [ 49.701849][ C0] tick_sched_timer+0x43/0xe0 [ 49.706500][ C0] __hrtimer_run_queues+0x288/0x600 [ 49.711781][ C0] hrtimer_interrupt+0x22a/0x480 [ 49.716718][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 49.722146][ C0] apic_timer_interrupt+0xf/0x20 [ 49.727056][ C0] __kcsan_check_watchpoint+0xbb/0x180 [ 49.732486][ C0] __tsan_read4+0x15/0x30 [ 49.736797][ C0] nf_conntrack_tcp_packet+0x16f9/0x3390 [ 49.742403][ C0] nf_conntrack_in+0x410/0xaa0 [ 49.747135][ C0] ipv4_conntrack_in+0x27/0x40 [ 49.751871][ C0] nf_hook_slow+0x83/0x160 [ 49.756256][ C0] [ 49.758554][ C0] Reported by Kernel Concurrency Sanitizer on: [ 49.764677][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.3.0+ #0 [ 49.771579][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.781607][ C0] ================================================================== [ 49.789638][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 49.796199][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.3.0+ #0 [ 49.803098][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.813123][ C0] Call Trace: [ 49.816389][ C0] [ 49.819225][ C0] dump_stack+0xf5/0x159 [ 49.823442][ C0] panic+0x209/0x639 [ 49.827308][ C0] ? __tsan_read4+0x15/0x30 [ 49.831816][ C0] ? vprintk_func+0x8d/0x140 [ 49.836381][ C0] kcsan_report.cold+0xc/0x1b [ 49.841062][ C0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 49.846580][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 49.852217][ C0] __tsan_read8+0x2c/0x30 [ 49.856519][ C0] tick_do_update_jiffies64+0x2b/0x260 [ 49.861953][ C0] tick_sched_do_timer+0xd4/0xe0 [ 49.866862][ C0] tick_sched_timer+0x43/0xe0 [ 49.871549][ C0] __hrtimer_run_queues+0x288/0x600 [ 49.876718][ C0] ? tick_sched_do_timer+0xe0/0xe0 [ 49.881833][ C0] hrtimer_interrupt+0x22a/0x480 [ 49.886745][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 49.892177][ C0] apic_timer_interrupt+0xf/0x20 [ 49.897128][ C0] [ 49.900042][ C0] RIP: 0010:__kcsan_check_watchpoint+0xbb/0x180 [ 49.906266][ C0] Code: 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 eb 31 49 21 cf 81 e3 ff [ 49.925844][ C0] RSP: 0018:ffffc90000cb3758 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 49.934225][ C0] RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000ffffffffffff [ 49.942179][ C0] RDX: 0000000000000001 RSI: 0000000000000038 RDI: 0000ffff85bf8d48 [ 49.950121][ C0] RBP: ffffc90000cb3780 R08: 0000000000000000 R09: 0000ffff85bf8d4b [ 49.958078][ C0] R10: 00000000aaaaaaab R11: ffffffff86042de0 R12: 0000000000000000 [ 49.966022][ C0] R13: ffffffff85bf8d48 R14: 0000000000000004 R15: ffff888123c90e00 [ 49.973977][ C0] __tsan_read4+0x15/0x30 [ 49.978293][ C0] nf_conntrack_tcp_packet+0x16f9/0x3390 [ 49.983920][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 49.989528][ C0] nf_conntrack_in+0x410/0xaa0 [ 49.994272][ C0] ipv4_conntrack_in+0x27/0x40 [ 49.999012][ C0] nf_hook_slow+0x83/0x160 [ 50.003397][ C0] ? nf_ct_l4proto_find+0xd0/0xd0 [ 50.008398][ C0] ip_rcv+0x12f/0x1a0 [ 50.012368][ C0] ? ip_sublist_rcv+0x5e0/0x5e0 [ 50.017191][ C0] ? ip_local_deliver+0x210/0x210 [ 50.022187][ C0] __netif_receive_skb_one_core+0xa7/0xe0 [ 50.027876][ C0] __netif_receive_skb+0x37/0xf0 [ 50.032787][ C0] netif_receive_skb_internal+0x59/0x190 [ 50.038394][ C0] napi_gro_receive+0x28f/0x330 [ 50.043230][ C0] receive_buf+0x284/0x30b0 [ 50.047706][ C0] ? __tsan_write8+0x32/0x40 [ 50.052277][ C0] ? virtqueue_get_buf_ctx+0x4fd/0x5c0 [ 50.057717][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 50.063319][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 50.068928][ C0] virtnet_poll+0x436/0x7d0 [ 50.073425][ C0] net_rx_action+0x3ae/0xa50 [ 50.077995][ C0] __do_softirq+0x115/0x33f [ 50.082480][ C0] ? takeover_tasklets+0x250/0x250 [ 50.087571][ C0] run_ksoftirqd+0x46/0x60 [ 50.091960][ C0] smpboot_thread_fn+0x37d/0x4a0 [ 50.096988][ C0] kthread+0x1d4/0x200 [ 50.101030][ C0] ? constant_test_bit.constprop.0+0x30/0x30 [ 50.106987][ C0] ? kthread_bind+0x50/0x50 [ 50.111463][ C0] ret_from_fork+0x1f/0x30 [ 50.117118][ C0] Kernel Offset: disabled [ 50.121441][ C0] Rebooting in 86400 seconds..