[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[ 40.423503][ T23] audit: type=1800 audit(1571744758.551:25): pid=7118 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[ 40.474902][ T23] audit: type=1800 audit(1571744758.551:26): pid=7118 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0
[ 40.494867][ T23] audit: type=1800 audit(1571744758.551:27): pid=7118 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 '10.128.10.60' (ECDSA) to the list of known hosts.
2019/10/22 11:46:06 fuzzer started
2019/10/22 11:46:08 dialing manager at 10.128.0.105:37053
2019/10/22 11:46:08 syscalls: 2524
2019/10/22 11:46:08 code coverage: enabled
2019/10/22 11:46:08 comparison tracing: enabled
2019/10/22 11:46:08 extra coverage: extra coverage is not supported by the kernel
2019/10/22 11:46:08 setuid sandbox: enabled
2019/10/22 11:46:08 namespace sandbox: enabled
2019/10/22 11:46:08 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/22 11:46:08 fault injection: enabled
2019/10/22 11:46:08 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/22 11:46:08 net packet injection: enabled
2019/10/22 11:46:08 net device setup: enabled
2019/10/22 11:46:08 concurrency sanitizer: enabled
syzkaller login: [ 50.434763][ C1] ==================================================================
[ 50.442890][ C1] BUG: KCSAN: data-race in __nf_conntrack_find_get / __nf_ct_refresh_acct
[ 50.451355][ C1]
[ 50.453717][ C1] write to 0xffff888124dad908 of 4 bytes by task 7276 on cpu 0:
[ 50.461344][ C1] __nf_ct_refresh_acct+0xfb/0x1b0
[ 50.466437][ C1] nf_conntrack_tcp_packet+0xd40/0x3390
[ 50.471963][ C1] nf_conntrack_in+0x410/0xa80
[ 50.476701][ C1] ipv4_conntrack_local+0xbe/0x130
[ 50.481828][ C1] nf_hook_slow+0x83/0x160
[ 50.486218][ C1] __ip_local_out+0x1f7/0x2b0
[ 50.490865][ C1] ip_local_out+0x31/0x90
[ 50.495167][ C1] __ip_queue_xmit+0x3a8/0xa40
[ 50.499904][ C1] ip_queue_xmit+0x45/0x60
[ 50.504330][ C1] __tcp_transmit_skb+0xe81/0x1d60
[ 50.509412][ C1] __tcp_send_ack+0x246/0x300
[ 50.514095][ C1] tcp_send_ack+0x34/0x40
[ 50.518398][ C1] tcp_cleanup_rbuf+0x130/0x360
[ 50.523256][ C1] tcp_recvmsg+0x633/0x1a30
[ 50.527726][ C1]
[ 50.530030][ C1] read to 0xffff888124dad908 of 4 bytes by interrupt on cpu 1:
[ 50.537547][ C1] __nf_conntrack_find_get+0x284/0x880
[ 50.542982][ C1] nf_conntrack_in+0x2ef/0xa80
[ 50.547716][ C1] ipv4_conntrack_in+0x27/0x40
[ 50.552457][ C1] nf_hook_slow+0x83/0x160
[ 50.556844][ C1] ip_rcv+0x12f/0x1a0
[ 50.560822][ C1] __netif_receive_skb_one_core+0xa7/0xe0
[ 50.566517][ C1] __netif_receive_skb+0x37/0xf0
[ 50.571429][ C1] netif_receive_skb_internal+0x59/0x190
[ 50.577122][ C1] napi_gro_receive+0x28f/0x330
[ 50.581946][ C1] receive_buf+0x284/0x30b0
[ 50.586424][ C1] virtnet_poll+0x436/0x7d0
[ 50.590898][ C1] net_rx_action+0x3ae/0xa90
[ 50.595463][ C1] __do_softirq+0x115/0x33f
[ 50.599933][ C1]
[ 50.602250][ C1] Reported by Kernel Concurrency Sanitizer on:
[ 50.608375][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0
[ 50.615452][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 50.625479][ C1] ==================================================================
[ 50.633516][ C1] Kernel panic - not syncing: panic_on_warn set ...
[ 50.640083][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0
[ 50.647160][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 50.657188][ C1] Call Trace:
[ 50.660445][ C1]
[ 50.663274][ C1] dump_stack+0xf5/0x159
[ 50.667506][ C1] panic+0x210/0x640
[ 50.671376][ C1] ? napi_gro_receive+0x28f/0x330
[ 50.676374][ C1] ? vprintk_func+0x8d/0x140
[ 50.680940][ C1] kcsan_report.cold+0xc/0x10
[ 50.685593][ C1] __kcsan_setup_watchpoint+0x32e/0x4a0
[ 50.691113][ C1] __tsan_read4+0x2c/0x30
[ 50.695430][ C1] __nf_conntrack_find_get+0x284/0x880
[ 50.700864][ C1] ? __tsan_write2+0x32/0x40
[ 50.705437][ C1] ? __kcsan_setup_watchpoint+0x6b/0x4a0
[ 50.711135][ C1] nf_conntrack_in+0x2ef/0xa80
[ 50.715877][ C1] ipv4_conntrack_in+0x27/0x40
[ 50.720616][ C1] nf_hook_slow+0x83/0x160
[ 50.725004][ C1] ? nf_ct_bridge_unregister+0x70/0x70
[ 50.730446][ C1] ip_rcv+0x12f/0x1a0
[ 50.734401][ C1] ? ip_sublist_rcv+0x5e0/0x5e0
[ 50.739223][ C1] ? ip_local_deliver+0x210/0x210
[ 50.744224][ C1] __netif_receive_skb_one_core+0xa7/0xe0
[ 50.749917][ C1] __netif_receive_skb+0x37/0xf0
[ 50.754842][ C1] netif_receive_skb_internal+0x59/0x190
[ 50.760462][ C1] napi_gro_receive+0x28f/0x330
[ 50.765385][ C1] receive_buf+0x284/0x30b0
[ 50.769862][ C1] ? __tsan_write8+0x32/0x40
[ 50.774431][ C1] ? virtqueue_get_buf_ctx+0x4fd/0x5c0
[ 50.779862][ C1] ? __kcsan_setup_watchpoint+0x6b/0x4a0
[ 50.785466][ C1] ? __kcsan_setup_watchpoint+0x6b/0x4a0
[ 50.791074][ C1] virtnet_poll+0x436/0x7d0
[ 50.795559][ C1] net_rx_action+0x3ae/0xa90
[ 50.800139][ C1] __do_softirq+0x115/0x33f
[ 50.804631][ C1] irq_exit+0xbb/0xe0
[ 50.808587][ C1] do_IRQ+0xa6/0x180
[ 50.812456][ C1] common_interrupt+0xf/0xf
[ 50.816927][ C1]
[ 50.819940][ C1] RIP: 0010:native_safe_halt+0xe/0x10
[ 50.825287][ 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
[ 50.844861][ C1] RSP: 0018:ffffc90000cd3e48 EFLAGS: 00000282 ORIG_RAX: ffffffffffffffde
[ 50.853252][ C1] RAX: 4bc6a7ef9db247db RBX: ffff88812b3850c0 RCX: 000000000000025b
[ 50.861199][ C1] RDX: 0000000000174120 RSI: 020c49ba5e353f7d RDI: ffffffff85a563b8
[ 50.869144][ C1] RBP: ffffc90000cd3e80 R08: 0000000000000000 R09: 0000ffff85a563bf
[ 50.877098][ C1] R10: 00000000aaaaaaab R11: ffffffff86045cc8 R12: 0000000000000001
[ 50.885122][ C1] R13: ffff88812b3850c0 R14: 0000000000000000 R15: 0000000000000000
[ 50.893088][ C1] ? default_idle+0x50/0x230
[ 50.897654][ C1] arch_cpu_idle+0x1f/0x30
[ 50.902047][ C1] default_idle_call+0x1e/0x40
[ 50.906789][ C1] do_idle+0x1af/0x280
[ 50.910845][ C1] cpu_startup_entry+0x1b/0x20
[ 50.915596][ C1] start_secondary+0x208/0x260
[ 50.920335][ C1] secondary_startup_64+0xa4/0xb0
[ 50.926580][ C1] Kernel Offset: disabled
[ 50.930894][ C1] Rebooting in 86400 seconds..