[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[ 37.059103][ T25] audit: type=1800 audit(1571357556.075:25): pid=7092 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[ 37.086432][ T25] audit: type=1800 audit(1571357556.075:26): pid=7092 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0
[ 37.113256][ T25] audit: type=1800 audit(1571357556.075:27): pid=7092 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[1G[[32m ok [39;49m8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
Debian GNU/Linux 7 syzkaller ttyS0
Warning: Permanently added '10.128.0.239' (ECDSA) to the list of known hosts.
2019/10/18 00:12:46 fuzzer started
2019/10/18 00:12:48 dialing manager at 10.128.0.105:43535
2019/10/18 00:12:48 syscalls: 2524
2019/10/18 00:12:48 code coverage: enabled
2019/10/18 00:12:48 comparison tracing: enabled
2019/10/18 00:12:48 extra coverage: extra coverage is not supported by the kernel
2019/10/18 00:12:48 setuid sandbox: enabled
2019/10/18 00:12:48 namespace sandbox: enabled
2019/10/18 00:12:48 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/18 00:12:48 fault injection: enabled
2019/10/18 00:12:48 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/18 00:12:48 net packet injection: enabled
2019/10/18 00:12:48 net device setup: enabled
2019/10/18 00:12:48 concurrency sanitizer: enabled
syzkaller login: [ 49.630180][ C0] ==================================================================
[ 49.638440][ C0] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64
[ 49.647357][ C0]
[ 49.649707][ C0] write to 0xffffffff86042008 of 8 bytes by interrupt on cpu 1:
[ 49.657318][ C0] tick_do_update_jiffies64+0x105/0x260
[ 49.662839][ C0] tick_sched_do_timer+0xd4/0xe0
[ 49.667758][ C0] tick_sched_timer+0x43/0xe0
[ 49.672423][ C0] __hrtimer_run_queues+0x288/0x600
[ 49.677595][ C0] hrtimer_interrupt+0x22a/0x480
[ 49.682524][ C0] smp_apic_timer_interrupt+0xdc/0x280
[ 49.688156][ C0] apic_timer_interrupt+0xf/0x20
[ 49.693170][ C0] __kcsan_check_watchpoint+0xfd/0x180
[ 49.698604][ C0] __tsan_read8+0x15/0x30
[ 49.702910][ C0] __tcp_transmit_skb+0xa30/0x1d60
[ 49.708011][ C0] __tcp_send_ack+0x246/0x300
[ 49.712661][ C0] tcp_send_ack+0x34/0x40
[ 49.717139][ C0] tcp_cleanup_rbuf+0x130/0x360
[ 49.721965][ C0] tcp_recvmsg+0x633/0x1a30
[ 49.726435][ C0]
[ 49.728756][ C0] read to 0xffffffff86042008 of 8 bytes by interrupt on cpu 0:
[ 49.736275][ C0] tick_do_update_jiffies64+0x2b/0x260
[ 49.741722][ C0] tick_sched_do_timer+0xd4/0xe0
[ 49.746636][ C0] tick_sched_timer+0x43/0xe0
[ 49.751301][ C0] __hrtimer_run_queues+0x288/0x600
[ 49.757861][ C0] hrtimer_interrupt+0x22a/0x480
[ 49.762783][ C0] smp_apic_timer_interrupt+0xdc/0x280
[ 49.768215][ C0] apic_timer_interrupt+0xf/0x20
[ 49.773130][ C0] __tsan_write1+0x1/0x40
[ 49.777436][ C0] packet_rcv_spkt+0x25e/0x310
[ 49.782193][ C0] __netif_receive_skb_core+0xe13/0x1a90
[ 49.787799][ C0] __netif_receive_skb_one_core+0x67/0xe0
[ 49.793926][ C0] __netif_receive_skb+0x37/0xf0
[ 49.798840][ C0] netif_receive_skb_internal+0x59/0x190
[ 49.804455][ C0]
[ 49.806756][ C0] Reported by Kernel Concurrency Sanitizer on:
[ 49.812897][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.4.0-rc3+ #0
[ 49.820155][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 49.830194][ C0] ==================================================================
[ 49.838228][ C0] Kernel panic - not syncing: panic_on_warn set ...
[ 49.844803][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.4.0-rc3+ #0
[ 49.852055][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 49.862087][ C0] Call Trace:
[ 49.865351][ C0]
[ 49.868186][ C0] dump_stack+0xf5/0x159
[ 49.872429][ C0] panic+0x210/0x640
[ 49.876318][ C0] ? packet_rcv_spkt+0x25e/0x310
[ 49.881322][ C0] ? vprintk_func+0x8d/0x140
[ 49.885905][ C0] kcsan_report.cold+0xc/0x10
[ 49.890563][ C0] __kcsan_setup_watchpoint+0x32e/0x4a0
[ 49.896098][ C0] ? __kcsan_setup_watchpoint+0x6b/0x4a0
[ 49.901796][ C0] __tsan_read8+0x2c/0x30
[ 49.906131][ C0] tick_do_update_jiffies64+0x2b/0x260
[ 49.911570][ C0] tick_sched_do_timer+0xd4/0xe0
[ 49.916502][ C0] tick_sched_timer+0x43/0xe0
[ 49.921188][ C0] __hrtimer_run_queues+0x288/0x600
[ 49.926448][ C0] ? tick_sched_do_timer+0xe0/0xe0
[ 49.931538][ C0] hrtimer_interrupt+0x22a/0x480
[ 49.936457][ C0] smp_apic_timer_interrupt+0xdc/0x280
[ 49.941891][ C0] ? smp_reschedule_interrupt+0x71/0x1d0
[ 49.947498][ C0] apic_timer_interrupt+0xf/0x20
[ 49.952414][ C0]
[ 49.955329][ C0] RIP: 0010:__tsan_write1+0x1/0x40
[ 49.960432][ C0] Code: 00 48 89 e5 41 54 49 89 fc e8 6b 04 00 00 84 c0 75 04 41 5c 5d c3 4c 89 e7 31 d2 be 01 00 00 00 e8 d4 05 00 00 41 5c 5d c3 55 01 00 00 00 be 01 00 00 00 48 89 e5 41 54 49 89 fc e8 38 04 00
[ 49.980194][ C0] RSP: 0018:ffffc90000cb3950 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
[ 49.988579][ C0] RAX: ffff8881257dcb2a RBX: ffff8881257dcb2e RCX: 0000000000000000
[ 49.996540][ C0] RDX: 0000000000000004 RSI: ffff88812a898004 RDI: ffff8881257dcb2e
[ 50.004502][ C0] RBP: ffffc90000cb3980 R08: 0000000000000000 R09: 000088812a898004
[ 50.012475][ C0] R10: 00000000aaaaaaab R11: ffffffff86045cd8 R12: 0000000000000004
[ 50.020451][ C0] R13: 0000000000000004 R14: ffff88812a898000 R15: ffff888121304e4e
[ 50.028499][ C0] ? strlcpy+0x54/0x70
[ 50.032644][ C0] packet_rcv_spkt+0x25e/0x310
[ 50.037447][ C0] ? packet_parse_headers.isra.0+0x260/0x260
[ 50.043405][ C0] __netif_receive_skb_core+0xe13/0x1a90
[ 50.049026][ C0] ? __tsan_write2+0x32/0x40
[ 50.053623][ C0] ? __kcsan_setup_watchpoint+0x6b/0x4a0
[ 50.059236][ C0] ? __kcsan_setup_watchpoint+0x6b/0x4a0
[ 50.064850][ C0] __netif_receive_skb_one_core+0x67/0xe0
[ 50.070547][ C0] __netif_receive_skb+0x37/0xf0
[ 50.075813][ C0] netif_receive_skb_internal+0x59/0x190
[ 50.081437][ C0] napi_gro_receive+0x28f/0x330
[ 50.086396][ C0] receive_buf+0x284/0x30b0
[ 50.090887][ C0] ? __tsan_write8+0x32/0x40
[ 50.095464][ C0] ? virtqueue_get_buf_ctx+0x4fd/0x5c0
[ 50.100914][ C0] ? __kcsan_setup_watchpoint+0x6b/0x4a0
[ 50.106539][ C0] ? __kcsan_setup_watchpoint+0x6b/0x4a0
[ 50.112154][ C0] virtnet_poll+0x436/0x7d0
[ 50.116648][ C0] ? __sanitizer_cov_trace_cmp2+0x18/0x20
[ 50.122362][ C0] net_rx_action+0x3ae/0xa90
[ 50.127072][ C0] __do_softirq+0x115/0x33f
[ 50.131570][ C0] ? takeover_tasklets+0x250/0x250
[ 50.136667][ C0] run_ksoftirqd+0x46/0x60
[ 50.141066][ C0] smpboot_thread_fn+0x37d/0x4a0
[ 50.146001][ C0] kthread+0x1d4/0x200
[ 50.150049][ C0] ? constant_test_bit.constprop.0+0x30/0x30
[ 50.156017][ C0] ? kthread_stop+0x2d0/0x2d0
[ 50.160778][ C0] ret_from_fork+0x1f/0x30
[ 50.166675][ C0] Kernel Offset: disabled
[ 50.171007][ C0] Rebooting in 86400 seconds..