[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.940503][ T23] audit: type=1800 audit(1571780350.509:25): pid=6990 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.967559][ T23] audit: type=1800 audit(1571780350.519:26): pid=6990 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.003971][ T23] audit: type=1800 audit(1571780350.519:27): pid=6990 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 '10.128.0.238' (ECDSA) to the list of known hosts. 2019/10/22 21:39:22 fuzzer started 2019/10/22 21:39:23 dialing manager at 10.128.0.105:33369 2019/10/22 21:39:23 syscalls: 2524 2019/10/22 21:39:23 code coverage: enabled 2019/10/22 21:39:23 comparison tracing: enabled 2019/10/22 21:39:23 extra coverage: extra coverage is not supported by the kernel 2019/10/22 21:39:23 setuid sandbox: enabled 2019/10/22 21:39:23 namespace sandbox: enabled 2019/10/22 21:39:23 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 21:39:23 fault injection: enabled 2019/10/22 21:39:23 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 21:39:23 net packet injection: enabled 2019/10/22 21:39:23 net device setup: enabled 2019/10/22 21:39:23 concurrency sanitizer: enabled syzkaller login: [ 48.216925][ T7162] ================================================================== [ 48.225081][ T7162] BUG: KCSAN: data-race in __nf_ct_refresh_acct / __nf_ct_refresh_acct [ 48.233309][ T7162] [ 48.235720][ T7162] read to 0xffff888122a34208 of 4 bytes by interrupt on cpu 1: [ 48.243264][ T7162] __nf_ct_refresh_acct+0xd4/0x1b0 [ 48.248359][ T7162] nf_conntrack_tcp_packet+0xd40/0x3390 [ 48.253892][ T7162] nf_conntrack_in+0x410/0xa80 [ 48.258642][ T7162] ipv4_conntrack_in+0x27/0x40 [ 48.263392][ T7162] nf_hook_slow+0x83/0x160 [ 48.267804][ T7162] ip_rcv+0x12f/0x1a0 [ 48.271809][ T7162] __netif_receive_skb_one_core+0xa7/0xe0 [ 48.277506][ T7162] __netif_receive_skb+0x37/0xf0 [ 48.282454][ T7162] netif_receive_skb_internal+0x59/0x190 [ 48.288062][ T7162] napi_gro_receive+0x28f/0x330 [ 48.292889][ T7162] receive_buf+0x284/0x30b0 [ 48.297404][ T7162] virtnet_poll+0x436/0x7d0 [ 48.301918][ T7162] net_rx_action+0x3ae/0xa90 [ 48.306486][ T7162] __do_softirq+0x115/0x33f [ 48.310971][ T7162] [ 48.313278][ T7162] write to 0xffff888122a34208 of 4 bytes by task 7162 on cpu 0: [ 48.320884][ T7162] __nf_ct_refresh_acct+0xfb/0x1b0 [ 48.325974][ T7162] nf_conntrack_tcp_packet+0xd40/0x3390 [ 48.331497][ T7162] nf_conntrack_in+0x410/0xa80 [ 48.337201][ T7162] ipv4_conntrack_local+0xbe/0x130 [ 48.342287][ T7162] nf_hook_slow+0x83/0x160 [ 48.346679][ T7162] __ip_local_out+0x1f7/0x2b0 [ 48.351333][ T7162] ip_local_out+0x31/0x90 [ 48.355637][ T7162] __ip_queue_xmit+0x3a8/0xa40 [ 48.360376][ T7162] ip_queue_xmit+0x45/0x60 [ 48.364780][ T7162] __tcp_transmit_skb+0xe81/0x1d60 [ 48.369865][ T7162] __tcp_send_ack+0x246/0x300 [ 48.374533][ T7162] tcp_send_ack+0x34/0x40 [ 48.378843][ T7162] tcp_cleanup_rbuf+0x130/0x360 [ 48.383665][ T7162] [ 48.385982][ T7162] Reported by Kernel Concurrency Sanitizer on: [ 48.392115][ T7162] CPU: 0 PID: 7162 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 48.399544][ T7162] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.409582][ T7162] ================================================================== [ 48.418748][ T7162] Kernel panic - not syncing: panic_on_warn set ... [ 48.425314][ T7162] CPU: 0 PID: 7162 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 48.432742][ T7162] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.442792][ T7162] Call Trace: [ 48.446067][ T7162] dump_stack+0xf5/0x159 [ 48.450310][ T7162] panic+0x210/0x640 [ 48.454201][ T7162] ? ip_queue_xmit+0x45/0x60 [ 48.458773][ T7162] ? vprintk_func+0x8d/0x140 [ 48.463342][ T7162] kcsan_report.cold+0xc/0x10 [ 48.467999][ T7162] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 48.473540][ T7162] __tsan_write4+0x32/0x40 [ 48.477936][ T7162] __nf_ct_refresh_acct+0xfb/0x1b0 [ 48.483029][ T7162] nf_conntrack_tcp_packet+0xd40/0x3390 [ 48.488557][ T7162] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 48.494171][ T7162] nf_conntrack_in+0x410/0xa80 [ 48.498917][ T7162] ipv4_conntrack_local+0xbe/0x130 [ 48.504023][ T7162] nf_hook_slow+0x83/0x160 [ 48.508414][ T7162] ? nf_ct_tcp_fixup+0xe0/0xe0 [ 48.513156][ T7162] __ip_local_out+0x1f7/0x2b0 [ 48.517825][ T7162] ? constant_test_bit+0x30/0x30 [ 48.522740][ T7162] ip_local_out+0x31/0x90 [ 48.527050][ T7162] __ip_queue_xmit+0x3a8/0xa40 [ 48.531797][ T7162] ip_queue_xmit+0x45/0x60 [ 48.536191][ T7162] __tcp_transmit_skb+0xe81/0x1d60 [ 48.541284][ T7162] __tcp_send_ack+0x246/0x300 [ 48.545939][ T7162] tcp_send_ack+0x34/0x40 [ 48.550254][ T7162] tcp_cleanup_rbuf+0x130/0x360 [ 48.555080][ T7162] tcp_recvmsg+0x633/0x1a30 [ 48.559578][ T7162] inet_recvmsg+0xbb/0x250 [ 48.563969][ T7162] ? __tsan_read8+0x2c/0x30 [ 48.568464][ T7162] ? inet_sendpage+0x100/0x100 [ 48.573206][ T7162] sock_recvmsg+0x92/0xb0 [ 48.577514][ T7162] sock_read_iter+0x15f/0x1e0 [ 48.582173][ T7162] new_sync_read+0x389/0x4f0 [ 48.586751][ T7162] __vfs_read+0xb1/0xc0 [ 48.590899][ T7162] vfs_read+0x143/0x2c0 [ 48.595034][ T7162] ksys_read+0xd5/0x1b0 [ 48.599180][ T7162] __x64_sys_read+0x4c/0x60 [ 48.603675][ T7162] do_syscall_64+0xcc/0x370 [ 48.608167][ T7162] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 48.614049][ T7162] RIP: 0033:0x47c530 [ 48.617927][ T7162] Code: 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 49 c7 c2 00 00 00 00 49 c7 c0 00 00 00 00 49 c7 c1 00 00 00 00 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 [ 48.637521][ T7162] RSP: 002b:000000c4201b9810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 48.645921][ T7162] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 48.653868][ T7162] RDX: 0000000000001000 RSI: 000000c420134000 RDI: 0000000000000003 [ 48.661814][ T7162] RBP: 000000c4201b9868 R08: 0000000000000000 R09: 0000000000000000 [ 48.669760][ T7162] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000004 [ 48.677811][ T7162] R13: 000000c4206d6490 R14: 0000000000000002 R15: ffffffffffffffff [ 48.686938][ T7162] Kernel Offset: disabled [ 48.691258][ T7162] Rebooting in 86400 seconds..