[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[ 35.829573][ T26] audit: type=1800 audit(1571225321.463:25): pid=7062 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[ 35.849870][ T26] audit: type=1800 audit(1571225321.473:26): pid=7062 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0
[ 35.869790][ T26] audit: type=1800 audit(1571225321.473:27): pid=7062 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 '10.128.0.145' (ECDSA) to the list of known hosts.
2019/10/16 11:28:52 fuzzer started
2019/10/16 11:28:54 dialing manager at 10.128.0.105:34737
2019/10/16 11:28:54 syscalls: 2524
2019/10/16 11:28:54 code coverage: enabled
2019/10/16 11:28:54 comparison tracing: enabled
2019/10/16 11:28:54 extra coverage: extra coverage is not supported by the kernel
2019/10/16 11:28:54 setuid sandbox: enabled
2019/10/16 11:28:54 namespace sandbox: enabled
2019/10/16 11:28:54 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/16 11:28:54 fault injection: enabled
2019/10/16 11:28:54 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/16 11:28:54 net packet injection: enabled
2019/10/16 11:28:54 net device setup: enabled
2019/10/16 11:28:54 concurrency sanitizer: enabled
syzkaller login: [ 49.181508][ C0] ==================================================================
[ 49.189629][ C0] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64
[ 49.198657][ C0]
[ 49.200994][ C0] write to 0xffffffff86042008 of 8 bytes by interrupt on cpu 1:
[ 49.208601][ C0] tick_do_update_jiffies64+0x105/0x260
[ 49.214208][ C0] tick_sched_do_timer+0xd4/0xe0
[ 49.219122][ C0] tick_sched_timer+0x43/0xe0
[ 49.224489][ C0] __hrtimer_run_queues+0x288/0x600
[ 49.229663][ C0] hrtimer_interrupt+0x22a/0x480
[ 49.234577][ C0] smp_apic_timer_interrupt+0xdc/0x280
[ 49.240027][ C0] apic_timer_interrupt+0xf/0x20
[ 49.244944][ C0] __kcsan_check_watchpoint+0x49/0x180
[ 49.250375][ C0] __tsan_write4+0x18/0x40
[ 49.254783][ C0] __rcu_read_lock+0x3c/0x50
[ 49.259349][ C0] ip_output+0x12c/0x210
[ 49.263565][ C0] ip_local_out+0x74/0x90
[ 49.267868][ C0] __ip_queue_xmit+0x3a8/0xa40
[ 49.272713][ C0] ip_queue_xmit+0x45/0x60
[ 49.277097][ C0]
[ 49.279405][ C0] read to 0xffffffff86042008 of 8 bytes by interrupt on cpu 0:
[ 49.286942][ C0] tick_do_update_jiffies64+0x2b/0x260
[ 49.292381][ C0] tick_sched_do_timer+0xd4/0xe0
[ 49.297312][ C0] tick_sched_timer+0x43/0xe0
[ 49.301965][ C0] __hrtimer_run_queues+0x288/0x600
[ 49.307142][ C0] hrtimer_interrupt+0x22a/0x480
[ 49.312072][ C0] smp_apic_timer_interrupt+0xdc/0x280
[ 49.317503][ C0] apic_timer_interrupt+0xf/0x20
[ 49.322418][ C0] __sanitizer_cov_trace_pc+0x1/0x50
[ 49.327697][ C0] iptable_mangle_hook+0x7a/0x260
[ 49.332699][ C0] nf_hook_slow+0x83/0x160
[ 49.337090][ C0] ip_local_deliver+0x1e5/0x210
[ 49.341917][ C0] ip_rcv_finish+0x121/0x160
[ 49.346496][ C0] ip_rcv+0x18f/0x1a0
[ 49.350462][ C0]
[ 49.352765][ C0] Reported by Kernel Concurrency Sanitizer on:
[ 49.358910][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.4.0-rc3+ #0
[ 49.366179][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 49.376661][ C0] ==================================================================
[ 49.384710][ C0] Kernel panic - not syncing: panic_on_warn set ...
[ 49.391272][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.4.0-rc3+ #0
[ 49.398622][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 49.408648][ C0] Call Trace:
[ 49.411905][ C0]
[ 49.414739][ C0] dump_stack+0xf5/0x159
[ 49.418956][ C0] panic+0x210/0x640
[ 49.422828][ C0] ? iptable_mangle_hook+0x7a/0x260
[ 49.428001][ C0] ? vprintk_func+0x8d/0x140
[ 49.432568][ C0] kcsan_report.cold+0xc/0x1b
[ 49.437221][ C0] __kcsan_setup_watchpoint+0x3ee/0x510
[ 49.443520][ C0] ? __kcsan_setup_watchpoint+0x96/0x510
[ 49.449130][ C0] __tsan_read8+0x2c/0x30
[ 49.453436][ C0] tick_do_update_jiffies64+0x2b/0x260
[ 49.458886][ C0] tick_sched_do_timer+0xd4/0xe0
[ 49.463801][ C0] tick_sched_timer+0x43/0xe0
[ 49.468455][ C0] __hrtimer_run_queues+0x288/0x600
[ 49.473631][ C0] ? tick_sched_do_timer+0xe0/0xe0
[ 49.478732][ C0] hrtimer_interrupt+0x22a/0x480
[ 49.483664][ C0] smp_apic_timer_interrupt+0xdc/0x280
[ 49.489097][ C0] apic_timer_interrupt+0xf/0x20
[ 49.494038][ C0] RIP: 0010:__sanitizer_cov_trace_pc+0x1/0x50
[ 49.500082][ C0] Code: ff 48 c7 c7 88 37 04 86 e8 6c ff 0c 00 48 c7 05 d9 77 be 04 00 00 00 00 e9 6a f1 ff ff 90 90 90 90 90 90 90 90 90 90 90 90 55 <48> 89 e5 65 48 8b 04 25 40 6c 01 00 65 8b 15 34 ac bb 7e 81 e2 00
[ 49.519672][ C0] RSP: 0018:ffffc90000003858 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
[ 49.528072][ C0] RAX: ffff88812b371100 RBX: 0000000000000001 RCX: 000000000000078a
[ 49.536304][ C0] RDX: 0000000000000100 RSI: ffffffff83fffc9d RDI: ffff888129320c10
[ 49.544268][ C0] RBP: ffffc900000039d0 R08: 0000000000000000 R09: 0000888129320c13
[ 49.552220][ C0] R10: 00000000aaaaaaab R11: ffffffff86045d18 R12: ffff888129320c00
[ 49.560170][ C0] R13: ffff8881230b9e00 R14: ffff888129320c04 R15: ffff888129320cd8
[ 49.569096][ C0] ? apic_timer_interrupt+0xa/0x20
[ 49.574197][ C0] ? ipt_do_table+0x2cd/0xe60
[ 49.578852][ C0] ? ipt_do_table+0x2db/0xe60
[ 49.583508][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80
[ 49.589378][ C0] ? __kcsan_setup_watchpoint+0x96/0x510
[ 49.594998][ C0] ? __kcsan_setup_watchpoint+0x96/0x510
[ 49.600610][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[ 49.606828][ C0] ? __kcsan_setup_watchpoint+0x96/0x510
[ 49.612451][ C0] iptable_mangle_hook+0x7a/0x260
[ 49.617461][ C0] ? __kcsan_setup_watchpoint+0x96/0x510
[ 49.623071][ C0] nf_hook_slow+0x83/0x160
[ 49.627460][ C0] ? iptable_mangle_net_exit+0xa0/0xa0
[ 49.632952][ C0] ip_local_deliver+0x1e5/0x210
[ 49.637802][ C0] ? ip_protocol_deliver_rcu+0x420/0x420
[ 49.643419][ C0] ip_rcv_finish+0x121/0x160
[ 49.647998][ C0] ip_rcv+0x18f/0x1a0
[ 49.651970][ C0] ? ip_sublist_rcv+0x5e0/0x5e0
[ 49.656807][ C0] ? ip_local_deliver+0x210/0x210
[ 49.661809][ C0] __netif_receive_skb_one_core+0xa7/0xe0
[ 49.667508][ C0] __netif_receive_skb+0x37/0xf0
[ 49.672422][ C0] netif_receive_skb_internal+0x59/0x190
[ 49.678034][ C0] napi_gro_receive+0x28f/0x330
[ 49.682861][ C0] receive_buf+0x284/0x30b0
[ 49.687348][ C0] ? __tsan_write8+0x32/0x40
[ 49.691922][ C0] ? virtqueue_get_buf_ctx+0x4fd/0x5c0
[ 49.697354][ C0] ? __kcsan_setup_watchpoint+0x96/0x510
[ 49.702969][ C0] ? __kcsan_setup_watchpoint+0x96/0x510
[ 49.708581][ C0] virtnet_poll+0x436/0x7d0
[ 49.713094][ C0] ? common_interrupt+0xf/0xf
[ 49.717801][ C0] net_rx_action+0x3ae/0xa90
[ 49.722376][ C0] __do_softirq+0x115/0x33f
[ 49.726862][ C0] irq_exit+0xbb/0xe0
[ 49.730831][ C0] do_IRQ+0xa6/0x180
[ 49.734714][ C0] common_interrupt+0xf/0xf
[ 49.739194][ C0]
[ 49.742116][ C0] RIP: 0010:smpboot_thread_fn+0x140/0x4a0
[ 49.747837][ C0] Code: cc 83 fe 01 0f 84 c7 00 00 00 e8 ab 49 12 00 e8 86 63 ff ff e9 0b ff ff ff e8 9c 49 12 00 4c 89 e7 e8 44 48 1f 00 45 8b 3c 24 8b cf 1b 01 89 c6 89 45 cc 44 89 ff e8 7e 4a 12 00 8b 75 cc 41
[ 49.767852][ C0] RSP: 0018:ffffc90000cb3ec8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffffda
[ 49.776239][ C0] RAX: bc6a7ef9db233887 RBX: ffff88812b371100 RCX: 00000000000005ca
[ 49.784188][ C0] RDX: 000000000059ef70 RSI: 020c49ba5e353f7d RDI: ffff88812b349540
[ 49.792154][ C0] RBP: ffffc90000cb3f00 R08: 0000000000000000 R09: 000088812b349543
[ 49.800134][ C0] R10: 00000000aaaaaaab R11: ffffffff86045c60 R12: ffff88812b349540
[ 49.808085][ C0] R13: ffffffff85a73880 R14: ffff88812b371110 R15: 0000000000000000
[ 49.816055][ C0] ? smpboot_thread_fn+0x13c/0x4a0
[ 49.821146][ C0] kthread+0x1d4/0x200
[ 49.825202][ C0] ? constant_test_bit.constprop.0+0x30/0x30
[ 49.831154][ C0] ? kthread_stop+0x2d0/0x2d0
[ 49.835808][ C0] ret_from_fork+0x1f/0x30
[ 49.841673][ C0] Kernel Offset: disabled
[ 49.846005][ C0] Rebooting in 86400 seconds..