[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[ 32.914603][ T26] audit: type=1800 audit(1571708828.602:25): pid=6911 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[ 32.941358][ T26] audit: type=1800 audit(1571708828.602:26): pid=6911 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0
[ 32.967849][ T26] audit: type=1800 audit(1571708828.602:27): pid=6911 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 '10.128.15.213' (ECDSA) to the list of known hosts.
2019/10/22 01:47:19 fuzzer started
2019/10/22 01:47:21 dialing manager at 10.128.0.105:37053
2019/10/22 01:47:21 syscalls: 2524
2019/10/22 01:47:21 code coverage: enabled
2019/10/22 01:47:21 comparison tracing: enabled
2019/10/22 01:47:21 extra coverage: extra coverage is not supported by the kernel
2019/10/22 01:47:21 setuid sandbox: enabled
2019/10/22 01:47:21 namespace sandbox: enabled
2019/10/22 01:47:21 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/22 01:47:21 fault injection: enabled
2019/10/22 01:47:21 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/22 01:47:21 net packet injection: enabled
2019/10/22 01:47:21 net device setup: enabled
2019/10/22 01:47:21 concurrency sanitizer: enabled
syzkaller login: [ 46.461310][ C0] ==================================================================
[ 46.469569][ C0] BUG: KCSAN: data-race in __nf_conntrack_find_get / __nf_ct_refresh_acct
[ 46.478213][ C0]
[ 46.480529][ C0] write to 0xffff888123dae108 of 4 bytes by task 7068 on cpu 1:
[ 46.488149][ C0] __nf_ct_refresh_acct+0xfb/0x1b0
[ 46.493248][ C0] nf_conntrack_tcp_packet+0xd40/0x3390
[ 46.498801][ C0] nf_conntrack_in+0x410/0xa80
[ 46.503700][ C0] ipv4_conntrack_local+0xbe/0x130
[ 46.508823][ C0] nf_hook_slow+0x83/0x160
[ 46.513216][ C0] __ip_local_out+0x1f7/0x2b0
[ 46.517879][ C0] ip_local_out+0x31/0x90
[ 46.522184][ C0] __ip_queue_xmit+0x3a8/0xa40
[ 46.527014][ C0] ip_queue_xmit+0x45/0x60
[ 46.531406][ C0] __tcp_transmit_skb+0xe81/0x1d60
[ 46.536593][ C0] __tcp_send_ack+0x246/0x300
[ 46.541251][ C0] tcp_send_ack+0x34/0x40
[ 46.545740][ C0] tcp_cleanup_rbuf+0x130/0x360
[ 46.550688][ C0] tcp_recvmsg+0x633/0x1a30
[ 46.555165][ C0]
[ 46.557480][ C0] read to 0xffff888123dae108 of 4 bytes by interrupt on cpu 0:
[ 46.565010][ C0] __nf_conntrack_find_get+0x284/0x880
[ 46.570455][ C0] nf_conntrack_in+0x2ef/0xa80
[ 46.575203][ C0] ipv4_conntrack_in+0x27/0x40
[ 46.579943][ C0] nf_hook_slow+0x83/0x160
[ 46.584334][ C0] ip_rcv+0x12f/0x1a0
[ 46.588307][ C0] __netif_receive_skb_one_core+0xa7/0xe0
[ 46.594000][ C0] __netif_receive_skb+0x37/0xf0
[ 46.598915][ C0] netif_receive_skb_internal+0x59/0x190
[ 46.604524][ C0] napi_gro_receive+0x28f/0x330
[ 46.609353][ C0] receive_buf+0x284/0x30b0
[ 46.613876][ C0] virtnet_poll+0x436/0x7d0
[ 46.618360][ C0] net_rx_action+0x3ae/0xa90
[ 46.622931][ C0] __do_softirq+0x115/0x33f
[ 46.627448][ C0]
[ 46.629756][ C0] Reported by Kernel Concurrency Sanitizer on:
[ 46.636062][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0
[ 46.643173][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 46.653208][ C0] ==================================================================
[ 46.661419][ C0] Kernel panic - not syncing: panic_on_warn set ...
[ 46.667981][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0
[ 46.675061][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 46.685209][ C0] Call Trace:
[ 46.688473][ C0]
[ 46.691308][ C0] dump_stack+0xf5/0x159
[ 46.695551][ C0] panic+0x210/0x640
[ 46.699426][ C0] ? napi_gro_receive+0x28f/0x330
[ 46.704426][ C0] ? vprintk_func+0x8d/0x140
[ 46.709096][ C0] kcsan_report.cold+0xc/0x10
[ 46.713754][ C0] __kcsan_setup_watchpoint+0x32e/0x4a0
[ 46.719276][ C0] __tsan_read4+0x2c/0x30
[ 46.723586][ C0] __nf_conntrack_find_get+0x284/0x880
[ 46.729057][ C0] ? __tsan_write2+0x32/0x40
[ 46.733647][ C0] ? __kcsan_setup_watchpoint+0x6b/0x4a0
[ 46.739257][ C0] nf_conntrack_in+0x2ef/0xa80
[ 46.744004][ C0] ipv4_conntrack_in+0x27/0x40
[ 46.748745][ C0] nf_hook_slow+0x83/0x160
[ 46.753143][ C0] ? nf_ct_bridge_unregister+0x70/0x70
[ 46.758580][ C0] ip_rcv+0x12f/0x1a0
[ 46.762536][ C0] ? ip_sublist_rcv+0x5e0/0x5e0
[ 46.767362][ C0] ? ip_local_deliver+0x210/0x210
[ 46.772368][ C0] __netif_receive_skb_one_core+0xa7/0xe0
[ 46.778108][ C0] __netif_receive_skb+0x37/0xf0
[ 46.783144][ C0] netif_receive_skb_internal+0x59/0x190
[ 46.788756][ C0] napi_gro_receive+0x28f/0x330
[ 46.793587][ C0] receive_buf+0x284/0x30b0
[ 46.798071][ C0] ? __tsan_write8+0x32/0x40
[ 46.802645][ C0] ? virtqueue_get_buf_ctx+0x4fd/0x5c0
[ 46.808081][ C0] ? __kcsan_setup_watchpoint+0x6b/0x4a0
[ 46.813721][ C0] ? __kcsan_setup_watchpoint+0x6b/0x4a0
[ 46.819339][ C0] virtnet_poll+0x436/0x7d0
[ 46.823825][ C0] net_rx_action+0x3ae/0xa90
[ 46.828400][ C0] __do_softirq+0x115/0x33f
[ 46.832886][ C0] irq_exit+0xbb/0xe0
[ 46.836853][ C0] do_IRQ+0xa6/0x180
[ 46.840755][ C0] common_interrupt+0xf/0xf
[ 46.845230][ C0]
[ 46.848152][ C0] RIP: 0010:native_safe_halt+0xe/0x10
[ 46.853679][ C0] 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
[ 46.873259][ C0] RSP: 0018:ffffffff85a03de0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffffda
[ 46.881674][ C0] RAX: a3d70a3d70a42267 RBX: ffffffff85a2b780 RCX: 0000000000000501
[ 46.889721][ C0] RDX: 0000000000416630 RSI: 020c49ba5e353f7d RDI: ffffffff85a563b8
[ 46.897778][ C0] RBP: ffffffff85a03e18 R08: 0000000000000000 R09: 0000ffff85a563bf
[ 46.905746][ C0] R10: 00000000aaaaaaab R11: ffffffff86045cc8 R12: 0000000000000000
[ 46.913704][ C0] R13: ffffffff85a2b780 R14: 0000000000000000 R15: 0000000000000000
[ 46.921666][ C0] ? default_idle+0x50/0x230
[ 46.926240][ C0] arch_cpu_idle+0x1f/0x30
[ 46.930637][ C0] default_idle_call+0x1e/0x40
[ 46.935383][ C0] do_idle+0x1af/0x280
[ 46.939431][ C0] cpu_startup_entry+0x1b/0x20
[ 46.944283][ C0] rest_init+0xec/0xf6
[ 46.948330][ C0] ? trace_event_define_fields_vector_free_moved+0xce/0xce
[ 46.955533][ C0] arch_call_rest_init+0x17/0x37
[ 46.960452][ C0] start_kernel+0x838/0x85e
[ 46.964938][ C0] x86_64_start_reservations+0x29/0x2b
[ 46.970373][ C0] x86_64_start_kernel+0x72/0x76
[ 46.975312][ C0] secondary_startup_64+0xa4/0xb0
[ 46.981672][ C0] Kernel Offset: disabled
[ 46.985998][ C0] Rebooting in 86400 seconds..