[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[ 37.951109][ T26] audit: type=1800 audit(1571703829.047:25): pid=7109 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[ 38.001281][ T26] audit: type=1800 audit(1571703829.047:26): pid=7109 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0
[ 38.036920][ T26] audit: type=1800 audit(1571703829.047:27): pid=7109 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 '10.128.0.168' (ECDSA) to the list of known hosts.
2019/10/22 00:23:59 fuzzer started
2019/10/22 00:24:00 dialing manager at 10.128.0.105:39747
2019/10/22 00:24:00 syscalls: 2524
2019/10/22 00:24:00 code coverage: enabled
2019/10/22 00:24:00 comparison tracing: enabled
2019/10/22 00:24:00 extra coverage: extra coverage is not supported by the kernel
2019/10/22 00:24:00 setuid sandbox: enabled
2019/10/22 00:24:00 namespace sandbox: enabled
2019/10/22 00:24:00 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/22 00:24:00 fault injection: enabled
2019/10/22 00:24:00 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/22 00:24:00 net packet injection: enabled
2019/10/22 00:24:00 net device setup: enabled
2019/10/22 00:24:00 concurrency sanitizer: enabled
syzkaller login: [ 49.837054][ C1] ==================================================================
[ 49.845224][ C1] BUG: KCSAN: data-race in __nf_conntrack_find_get / __nf_ct_refresh_acct
[ 49.854067][ C1]
[ 49.856383][ C1] write to 0xffff888120c14508 of 4 bytes by task 7264 on cpu 0:
[ 49.864459][ C1] __nf_ct_refresh_acct+0xfb/0x1b0
[ 49.869560][ C1] nf_conntrack_tcp_packet+0xd40/0x3390
[ 49.875083][ C1] nf_conntrack_in+0x410/0xa80
[ 49.879822][ C1] ipv4_conntrack_local+0xbe/0x130
[ 49.884922][ C1] nf_hook_slow+0x83/0x160
[ 49.889315][ C1] __ip_local_out+0x1f7/0x2b0
[ 49.893979][ C1] ip_local_out+0x31/0x90
[ 49.898284][ C1] __ip_queue_xmit+0x3a8/0xa40
[ 49.903034][ C1] ip_queue_xmit+0x45/0x60
[ 49.907444][ C1] __tcp_transmit_skb+0xe81/0x1d60
[ 49.912532][ C1] __tcp_send_ack+0x246/0x300
[ 49.917190][ C1] tcp_send_ack+0x34/0x40
[ 49.921498][ C1] tcp_cleanup_rbuf+0x130/0x360
[ 49.926353][ C1] tcp_recvmsg+0x633/0x1a30
[ 49.931196][ C1]
[ 49.933518][ C1] read to 0xffff888120c14508 of 4 bytes by interrupt on cpu 1:
[ 49.941048][ C1] __nf_conntrack_find_get+0x284/0x880
[ 49.946485][ C1] nf_conntrack_in+0x2ef/0xa80
[ 49.951251][ C1] ipv4_conntrack_in+0x27/0x40
[ 49.955991][ C1] nf_hook_slow+0x83/0x160
[ 49.960398][ C1] ip_rcv+0x12f/0x1a0
[ 49.964356][ C1] __netif_receive_skb_one_core+0xa7/0xe0
[ 49.970058][ C1] __netif_receive_skb+0x37/0xf0
[ 49.974982][ C1] netif_receive_skb_internal+0x59/0x190
[ 49.980603][ C1] napi_gro_receive+0x28f/0x330
[ 49.985557][ C1] receive_buf+0x284/0x30b0
[ 49.990044][ C1] virtnet_poll+0x436/0x7d0
[ 49.994542][ C1] net_rx_action+0x3ae/0xa90
[ 49.999136][ C1] __do_softirq+0x115/0x33f
[ 50.003615][ C1]
[ 50.005957][ C1] Reported by Kernel Concurrency Sanitizer on:
[ 50.012091][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0
[ 50.019186][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 50.029246][ C1] ==================================================================
[ 50.037295][ C1] Kernel panic - not syncing: panic_on_warn set ...
[ 50.043857][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0
[ 50.050953][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 50.061276][ C1] Call Trace:
[ 50.064537][ C1]
[ 50.067373][ C1] dump_stack+0xf5/0x159
[ 50.071767][ C1] panic+0x210/0x640
[ 50.075641][ C1] ? napi_gro_receive+0x28f/0x330
[ 50.080656][ C1] ? vprintk_func+0x8d/0x140
[ 50.085225][ C1] kcsan_report.cold+0xc/0x10
[ 50.089914][ C1] __kcsan_setup_watchpoint+0x32e/0x4a0
[ 50.095436][ C1] __tsan_read4+0x2c/0x30
[ 50.099744][ C1] __nf_conntrack_find_get+0x284/0x880
[ 50.105177][ C1] ? __tsan_write2+0x32/0x40
[ 50.109745][ C1] ? __kcsan_setup_watchpoint+0x6b/0x4a0
[ 50.115357][ C1] nf_conntrack_in+0x2ef/0xa80
[ 50.120114][ C1] ipv4_conntrack_in+0x27/0x40
[ 50.125000][ C1] nf_hook_slow+0x83/0x160
[ 50.129490][ C1] ? nf_ct_bridge_unregister+0x70/0x70
[ 50.134933][ C1] ip_rcv+0x12f/0x1a0
[ 50.138923][ C1] ? ip_sublist_rcv+0x5e0/0x5e0
[ 50.143768][ C1] ? ip_local_deliver+0x210/0x210
[ 50.148787][ C1] __netif_receive_skb_one_core+0xa7/0xe0
[ 50.154541][ C1] __netif_receive_skb+0x37/0xf0
[ 50.159467][ C1] netif_receive_skb_internal+0x59/0x190
[ 50.165095][ C1] napi_gro_receive+0x28f/0x330
[ 50.169932][ C1] receive_buf+0x284/0x30b0
[ 50.174435][ C1] ? __tsan_write8+0x32/0x40
[ 50.179021][ C1] ? virtqueue_get_buf_ctx+0x4fd/0x5c0
[ 50.184732][ C1] ? __kcsan_setup_watchpoint+0x6b/0x4a0
[ 50.190355][ C1] ? __kcsan_setup_watchpoint+0x6b/0x4a0
[ 50.195993][ C1] virtnet_poll+0x436/0x7d0
[ 50.200749][ C1] net_rx_action+0x3ae/0xa90
[ 50.205335][ C1] __do_softirq+0x115/0x33f
[ 50.209822][ C1] irq_exit+0xbb/0xe0
[ 50.213884][ C1] do_IRQ+0xa6/0x180
[ 50.217756][ C1] common_interrupt+0xf/0xf
[ 50.222232][ C1]
[ 50.225153][ C1] RIP: 0010:native_safe_halt+0xe/0x10
[ 50.231296][ C1] Code: 90 90 90 90 90 90 90 90 90 90 90 90 e9 07 00 00 00 0f 00 2d fc b2 4b 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d ec b2 4b 00 fb f4 90 55 48 89 e5 41 55 41 54 53 e8 72 12 a4 fc e8 6d 8e b8 fd 0f
[ 50.250896][ C1] RSP: 0018:ffffc90000cd3e48 EFLAGS: 00000282 ORIG_RAX: ffffffffffffffde
[ 50.259284][ C1] RAX: 6e978d4fdf3b7f94 RBX: ffff88812b3850c0 RCX: 000000000000036a
[ 50.267248][ C1] RDX: 0000000000179ee0 RSI: 020c49ba5e353f7d RDI: ffffffff85a563b8
[ 50.275212][ C1] RBP: ffffc90000cd3e80 R08: 0000000000000000 R09: 0000ffff85a563bf
[ 50.283335][ C1] R10: 00000000aaaaaaab R11: ffffffff86045cc8 R12: 0000000000000001
[ 50.291629][ C1] R13: ffff88812b3850c0 R14: 0000000000000000 R15: 0000000000000000
[ 50.299605][ C1] ? default_idle+0x50/0x230
[ 50.304179][ C1] arch_cpu_idle+0x1f/0x30
[ 50.308574][ C1] default_idle_call+0x1e/0x40
[ 50.313330][ C1] do_idle+0x1af/0x280
[ 50.317479][ C1] ? complete+0x44/0x50
[ 50.321908][ C1] cpu_startup_entry+0x1b/0x20
[ 50.326668][ C1] start_secondary+0x208/0x260
[ 50.331417][ C1] secondary_startup_64+0xa4/0xb0
[ 50.337729][ C1] Kernel Offset: disabled
[ 50.342062][ C1] Rebooting in 86400 seconds..