[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 37.322423][ T25] audit: type=1800 audit(1571759334.550:25): pid=6971 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 37.343893][ T25] audit: type=1800 audit(1571759334.550:26): pid=6971 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 37.365988][ T25] audit: type=1800 audit(1571759334.550:27): pid=6971 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 '10.128.0.56' (ECDSA) to the list of known hosts. 2019/10/22 15:49:05 fuzzer started 2019/10/22 15:49:06 dialing manager at 10.128.0.105:33369 2019/10/22 15:49:06 syscalls: 2524 2019/10/22 15:49:06 code coverage: enabled 2019/10/22 15:49:06 comparison tracing: enabled 2019/10/22 15:49:06 extra coverage: extra coverage is not supported by the kernel 2019/10/22 15:49:06 setuid sandbox: enabled 2019/10/22 15:49:06 namespace sandbox: enabled 2019/10/22 15:49:06 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 15:49:06 fault injection: enabled 2019/10/22 15:49:06 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 15:49:06 net packet injection: enabled 2019/10/22 15:49:06 net device setup: enabled 2019/10/22 15:49:06 concurrency sanitizer: enabled syzkaller login: [ 50.187624][ C1] ================================================================== [ 50.195807][ C1] BUG: KCSAN: data-race in __nf_conntrack_find_get / __nf_ct_refresh_acct [ 50.204285][ C1] [ 50.206636][ C1] write to 0xffff8881228da608 of 4 bytes by task 7120 on cpu 0: [ 50.214261][ C1] __nf_ct_refresh_acct+0xfb/0x1b0 [ 50.219374][ C1] nf_conntrack_tcp_packet+0xd40/0x3390 [ 50.224900][ C1] nf_conntrack_in+0x410/0xa80 [ 50.230074][ C1] ipv4_conntrack_local+0xbe/0x130 [ 50.235169][ C1] nf_hook_slow+0x83/0x160 [ 50.239646][ C1] __ip_local_out+0x1f7/0x2b0 [ 50.244365][ C1] ip_local_out+0x31/0x90 [ 50.248679][ C1] __ip_queue_xmit+0x3a8/0xa40 [ 50.253426][ C1] ip_queue_xmit+0x45/0x60 [ 50.257955][ C1] __tcp_transmit_skb+0xe81/0x1d60 [ 50.263045][ C1] __tcp_send_ack+0x246/0x300 [ 50.267701][ C1] tcp_send_ack+0x34/0x40 [ 50.272150][ C1] tcp_cleanup_rbuf+0x130/0x360 [ 50.277793][ C1] tcp_recvmsg+0x633/0x1a30 [ 50.282314][ C1] [ 50.284621][ C1] read to 0xffff8881228da608 of 4 bytes by interrupt on cpu 1: [ 50.292142][ C1] __nf_conntrack_find_get+0x284/0x880 [ 50.297582][ C1] nf_conntrack_in+0x2ef/0xa80 [ 50.302321][ C1] ipv4_conntrack_in+0x27/0x40 [ 50.307063][ C1] nf_hook_slow+0x83/0x160 [ 50.311457][ C1] ip_rcv+0x12f/0x1a0 [ 50.315525][ C1] __netif_receive_skb_one_core+0xa7/0xe0 [ 50.321232][ C1] __netif_receive_skb+0x37/0xf0 [ 50.326159][ C1] netif_receive_skb_internal+0x59/0x190 [ 50.331783][ C1] napi_gro_receive+0x28f/0x330 [ 50.336626][ C1] receive_buf+0x284/0x30b0 [ 50.341106][ C1] virtnet_poll+0x436/0x7d0 [ 50.345601][ C1] net_rx_action+0x3ae/0xa90 [ 50.350199][ C1] __do_softirq+0x115/0x33f [ 50.354846][ C1] [ 50.357149][ C1] Reported by Kernel Concurrency Sanitizer on: [ 50.363280][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.4.0-rc3+ #0 [ 50.371069][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.381114][ C1] ================================================================== [ 50.389170][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 50.395748][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.4.0-rc3+ #0 [ 50.403090][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.413122][ C1] Call Trace: [ 50.416398][ C1] dump_stack+0xf5/0x159 [ 50.420619][ C1] panic+0x210/0x640 [ 50.424571][ C1] ? napi_gro_receive+0x28f/0x330 [ 50.429754][ C1] ? vprintk_func+0x8d/0x140 [ 50.434344][ C1] kcsan_report.cold+0xc/0x10 [ 50.439004][ C1] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 50.444530][ C1] __tsan_read4+0x2c/0x30 [ 50.448853][ C1] __nf_conntrack_find_get+0x284/0x880 [ 50.454654][ C1] ? __tsan_write2+0x32/0x40 [ 50.459222][ C1] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 50.464860][ C1] nf_conntrack_in+0x2ef/0xa80 [ 50.469614][ C1] ipv4_conntrack_in+0x27/0x40 [ 50.474371][ C1] nf_hook_slow+0x83/0x160 [ 50.479026][ C1] ? nf_ct_bridge_unregister+0x70/0x70 [ 50.484473][ C1] ip_rcv+0x12f/0x1a0 [ 50.489127][ C1] ? ip_sublist_rcv+0x5e0/0x5e0 [ 50.493956][ C1] ? ip_local_deliver+0x210/0x210 [ 50.498970][ C1] __netif_receive_skb_one_core+0xa7/0xe0 [ 50.504681][ C1] __netif_receive_skb+0x37/0xf0 [ 50.509605][ C1] netif_receive_skb_internal+0x59/0x190 [ 50.515227][ C1] napi_gro_receive+0x28f/0x330 [ 50.520060][ C1] receive_buf+0x284/0x30b0 [ 50.524542][ C1] ? __tsan_write8+0x32/0x40 [ 50.529473][ C1] ? virtqueue_get_buf_ctx+0x4fd/0x5c0 [ 50.534923][ C1] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 50.540533][ C1] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 50.546147][ C1] virtnet_poll+0x436/0x7d0 [ 50.550639][ C1] net_rx_action+0x3ae/0xa90 [ 50.555298][ C1] __do_softirq+0x115/0x33f [ 50.559786][ C1] ? takeover_tasklets+0x250/0x250 [ 50.564875][ C1] run_ksoftirqd+0x46/0x60 [ 50.569270][ C1] smpboot_thread_fn+0x37d/0x4a0 [ 50.574209][ C1] kthread+0x1d4/0x200 [ 50.578260][ C1] ? constant_test_bit.constprop.0+0x30/0x30 [ 50.584230][ C1] ? kthread_stop+0x2d0/0x2d0 [ 50.589148][ C1] ret_from_fork+0x1f/0x30 [ 50.595075][ C1] Kernel Offset: disabled [ 50.599399][ C1] Rebooting in 86400 seconds..