[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.283739][ T25] audit: type=1800 audit(1571767326.532:25): pid=7046 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.321403][ T25] audit: type=1800 audit(1571767326.532:26): pid=7046 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.348991][ T25] audit: type=1800 audit(1571767326.532:27): pid=7046 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[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.224' (ECDSA) to the list of known hosts. 2019/10/22 18:02:17 fuzzer started 2019/10/22 18:02:19 dialing manager at 10.128.0.105:33369 2019/10/22 18:02:19 syscalls: 2524 2019/10/22 18:02:19 code coverage: enabled 2019/10/22 18:02:19 comparison tracing: enabled 2019/10/22 18:02:19 extra coverage: extra coverage is not supported by the kernel 2019/10/22 18:02:19 setuid sandbox: enabled 2019/10/22 18:02:19 namespace sandbox: enabled 2019/10/22 18:02:19 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 18:02:19 fault injection: enabled 2019/10/22 18:02:19 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 18:02:19 net packet injection: enabled 2019/10/22 18:02:19 net device setup: enabled 2019/10/22 18:02:19 concurrency sanitizer: enabled syzkaller login: [ 48.798669][ C1] ================================================================== [ 48.806802][ C1] BUG: KCSAN: data-race in __nf_conntrack_find_get / __nf_ct_refresh_acct [ 48.815268][ C1] [ 48.817580][ C1] write to 0xffff888123f85508 of 4 bytes by task 7204 on cpu 0: [ 48.825661][ C1] __nf_ct_refresh_acct+0xfb/0x1b0 [ 48.830749][ C1] nf_conntrack_tcp_packet+0xd40/0x3390 [ 48.836271][ C1] nf_conntrack_in+0x410/0xa80 [ 48.841008][ C1] ipv4_conntrack_local+0xbe/0x130 [ 48.846099][ C1] nf_hook_slow+0x83/0x160 [ 48.850514][ C1] __ip_local_out+0x1f7/0x2b0 [ 48.855172][ C1] ip_local_out+0x31/0x90 [ 48.859476][ C1] __ip_queue_xmit+0x3a8/0xa40 [ 48.864230][ C1] ip_queue_xmit+0x45/0x60 [ 48.868621][ C1] __tcp_transmit_skb+0xe81/0x1d60 [ 48.873727][ C1] __tcp_send_ack+0x246/0x300 [ 48.878400][ C1] tcp_send_ack+0x34/0x40 [ 48.882725][ C1] tcp_cleanup_rbuf+0x130/0x360 [ 48.887552][ C1] tcp_recvmsg+0x633/0x1a30 [ 48.892023][ C1] [ 48.894328][ C1] read to 0xffff888123f85508 of 4 bytes by interrupt on cpu 1: [ 48.901846][ C1] __nf_conntrack_find_get+0x284/0x880 [ 48.907297][ C1] nf_conntrack_in+0x2ef/0xa80 [ 48.912039][ C1] ipv4_conntrack_in+0x27/0x40 [ 48.916800][ C1] nf_hook_slow+0x83/0x160 [ 48.921201][ C1] ip_rcv+0x12f/0x1a0 [ 48.925172][ C1] __netif_receive_skb_one_core+0xa7/0xe0 [ 48.930873][ C1] __netif_receive_skb+0x37/0xf0 [ 48.935789][ C1] netif_receive_skb_internal+0x59/0x190 [ 48.941408][ C1] napi_gro_receive+0x28f/0x330 [ 48.946502][ C1] receive_buf+0x284/0x30b0 [ 48.951032][ C1] virtnet_poll+0x436/0x7d0 [ 48.955518][ C1] net_rx_action+0x3ae/0xa90 [ 48.960090][ C1] __do_softirq+0x115/0x33f [ 48.964566][ C1] [ 48.967006][ C1] Reported by Kernel Concurrency Sanitizer on: [ 48.973148][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.4.0-rc3+ #0 [ 48.980500][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.990533][ C1] ================================================================== [ 48.998571][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 49.005136][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.4.0-rc3+ #0 [ 49.012475][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.022502][ C1] Call Trace: [ 49.025773][ C1] dump_stack+0xf5/0x159 [ 49.030004][ C1] panic+0x210/0x640 [ 49.033879][ C1] ? napi_gro_receive+0x28f/0x330 [ 49.038879][ C1] ? vprintk_func+0x8d/0x140 [ 49.043464][ C1] kcsan_report.cold+0xc/0x10 [ 49.048121][ C1] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 49.053699][ C1] __tsan_read4+0x2c/0x30 [ 49.058100][ C1] __nf_conntrack_find_get+0x284/0x880 [ 49.063541][ C1] ? __tsan_write2+0x32/0x40 [ 49.068125][ C1] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 49.073751][ C1] nf_conntrack_in+0x2ef/0xa80 [ 49.078503][ C1] ipv4_conntrack_in+0x27/0x40 [ 49.083251][ C1] nf_hook_slow+0x83/0x160 [ 49.087645][ C1] ? nf_ct_bridge_unregister+0x70/0x70 [ 49.093081][ C1] ip_rcv+0x12f/0x1a0 [ 49.097051][ C1] ? ip_sublist_rcv+0x5e0/0x5e0 [ 49.101882][ C1] ? ip_local_deliver+0x210/0x210 [ 49.106898][ C1] __netif_receive_skb_one_core+0xa7/0xe0 [ 49.112599][ C1] __netif_receive_skb+0x37/0xf0 [ 49.117562][ C1] netif_receive_skb_internal+0x59/0x190 [ 49.123190][ C1] napi_gro_receive+0x28f/0x330 [ 49.128036][ C1] receive_buf+0x284/0x30b0 [ 49.132520][ C1] ? __tsan_write8+0x32/0x40 [ 49.137110][ C1] ? virtqueue_get_buf_ctx+0x4fd/0x5c0 [ 49.142548][ C1] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 49.148159][ C1] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 49.153772][ C1] virtnet_poll+0x436/0x7d0 [ 49.158273][ C1] net_rx_action+0x3ae/0xa90 [ 49.162860][ C1] __do_softirq+0x115/0x33f [ 49.167345][ C1] ? takeover_tasklets+0x250/0x250 [ 49.172433][ C1] run_ksoftirqd+0x46/0x60 [ 49.176856][ C1] smpboot_thread_fn+0x37d/0x4a0 [ 49.181780][ C1] kthread+0x1d4/0x200 [ 49.185834][ C1] ? constant_test_bit.constprop.0+0x30/0x30 [ 49.191797][ C1] ? kthread_stop+0x2d0/0x2d0 [ 49.196455][ C1] ret_from_fork+0x1f/0x30 [ 49.202105][ C1] Kernel Offset: disabled [ 49.206439][ C1] Rebooting in 86400 seconds..