[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.289044][ T26] audit: type=1800 audit(1571732964.839:25): pid=7140 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.309809][ T26] audit: type=1800 audit(1571732964.839:26): pid=7140 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.336087][ T26] audit: type=1800 audit(1571732964.839:27): pid=7140 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 '10.128.0.76' (ECDSA) to the list of known hosts. 2019/10/22 08:29:34 fuzzer started 2019/10/22 08:29:36 dialing manager at 10.128.0.105:37053 2019/10/22 08:29:36 syscalls: 2524 2019/10/22 08:29:36 code coverage: enabled 2019/10/22 08:29:36 comparison tracing: enabled 2019/10/22 08:29:36 extra coverage: extra coverage is not supported by the kernel 2019/10/22 08:29:36 setuid sandbox: enabled 2019/10/22 08:29:36 namespace sandbox: enabled 2019/10/22 08:29:36 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 08:29:36 fault injection: enabled 2019/10/22 08:29:36 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 08:29:36 net packet injection: enabled 2019/10/22 08:29:36 net device setup: enabled 2019/10/22 08:29:36 concurrency sanitizer: enabled syzkaller login: [ 48.184500][ T7312] ================================================================== [ 48.192650][ T7312] BUG: KCSAN: data-race in __nf_ct_refresh_acct / __nf_ct_refresh_acct [ 48.200866][ T7312] [ 48.203173][ T7312] read to 0xffff88812497da08 of 4 bytes by interrupt on cpu 0: [ 48.210744][ T7312] __nf_ct_refresh_acct+0xd4/0x1b0 [ 48.215847][ T7312] nf_conntrack_tcp_packet+0xd40/0x3390 [ 48.221401][ T7312] nf_conntrack_in+0x410/0xa80 [ 48.226151][ T7312] ipv4_conntrack_in+0x27/0x40 [ 48.230892][ T7312] nf_hook_slow+0x83/0x160 [ 48.235292][ T7312] ip_rcv+0x12f/0x1a0 [ 48.239258][ T7312] __netif_receive_skb_one_core+0xa7/0xe0 [ 48.244969][ T7312] __netif_receive_skb+0x37/0xf0 [ 48.249890][ T7312] netif_receive_skb_internal+0x59/0x190 [ 48.255494][ T7312] napi_gro_receive+0x28f/0x330 [ 48.260321][ T7312] receive_buf+0x284/0x30b0 [ 48.264803][ T7312] virtnet_poll+0x436/0x7d0 [ 48.269289][ T7312] net_rx_action+0x3ae/0xa90 [ 48.273862][ T7312] __do_softirq+0x115/0x33f [ 48.278330][ T7312] [ 48.280637][ T7312] write to 0xffff88812497da08 of 4 bytes by task 7312 on cpu 1: [ 48.288332][ T7312] __nf_ct_refresh_acct+0xfb/0x1b0 [ 48.293418][ T7312] nf_conntrack_tcp_packet+0xd40/0x3390 [ 48.298942][ T7312] nf_conntrack_in+0x410/0xa80 [ 48.303690][ T7312] ipv4_conntrack_local+0xbe/0x130 [ 48.308776][ T7312] nf_hook_slow+0x83/0x160 [ 48.313167][ T7312] __ip_local_out+0x1f7/0x2b0 [ 48.317987][ T7312] ip_local_out+0x31/0x90 [ 48.322292][ T7312] __ip_queue_xmit+0x3a8/0xa40 [ 48.327031][ T7312] ip_queue_xmit+0x45/0x60 [ 48.331423][ T7312] __tcp_transmit_skb+0xe81/0x1d60 [ 48.336506][ T7312] __tcp_send_ack+0x246/0x300 [ 48.341169][ T7312] tcp_send_ack+0x34/0x40 [ 48.345482][ T7312] tcp_cleanup_rbuf+0x130/0x360 [ 48.350302][ T7312] [ 48.352601][ T7312] Reported by Kernel Concurrency Sanitizer on: [ 48.358748][ T7312] CPU: 1 PID: 7312 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 48.366186][ T7312] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.376215][ T7312] ================================================================== [ 48.384247][ T7312] Kernel panic - not syncing: panic_on_warn set ... [ 48.390807][ T7312] CPU: 1 PID: 7312 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 48.398230][ T7312] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.408263][ T7312] Call Trace: [ 48.411534][ T7312] dump_stack+0xf5/0x159 [ 48.415752][ T7312] panic+0x210/0x640 [ 48.419625][ T7312] ? ip_queue_xmit+0x45/0x60 [ 48.424200][ T7312] ? vprintk_func+0x8d/0x140 [ 48.428773][ T7312] kcsan_report.cold+0xc/0x10 [ 48.433426][ T7312] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 48.438956][ T7312] __tsan_write4+0x32/0x40 [ 48.443348][ T7312] __nf_ct_refresh_acct+0xfb/0x1b0 [ 48.448446][ T7312] nf_conntrack_tcp_packet+0xd40/0x3390 [ 48.453975][ T7312] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 48.459583][ T7312] nf_conntrack_in+0x410/0xa80 [ 48.464326][ T7312] ipv4_conntrack_local+0xbe/0x130 [ 48.469413][ T7312] nf_hook_slow+0x83/0x160 [ 48.473812][ T7312] ? nf_ct_tcp_fixup+0xe0/0xe0 [ 48.478553][ T7312] __ip_local_out+0x1f7/0x2b0 [ 48.483203][ T7312] ? constant_test_bit+0x30/0x30 [ 48.488117][ T7312] ip_local_out+0x31/0x90 [ 48.492425][ T7312] __ip_queue_xmit+0x3a8/0xa40 [ 48.497170][ T7312] ip_queue_xmit+0x45/0x60 [ 48.501569][ T7312] __tcp_transmit_skb+0xe81/0x1d60 [ 48.506661][ T7312] __tcp_send_ack+0x246/0x300 [ 48.511321][ T7312] tcp_send_ack+0x34/0x40 [ 48.515628][ T7312] tcp_cleanup_rbuf+0x130/0x360 [ 48.520457][ T7312] tcp_recvmsg+0x633/0x1a30 [ 48.524954][ T7312] inet_recvmsg+0xbb/0x250 [ 48.529365][ T7312] ? __tsan_read8+0x2c/0x30 [ 48.533855][ T7312] ? inet_sendpage+0x100/0x100 [ 48.538599][ T7312] sock_recvmsg+0x92/0xb0 [ 48.542906][ T7312] sock_read_iter+0x15f/0x1e0 [ 48.547561][ T7312] new_sync_read+0x389/0x4f0 [ 48.552133][ T7312] __vfs_read+0xb1/0xc0 [ 48.556264][ T7312] vfs_read+0x143/0x2c0 [ 48.560397][ T7312] ksys_read+0xd5/0x1b0 [ 48.564581][ T7312] __x64_sys_read+0x4c/0x60 [ 48.569088][ T7312] do_syscall_64+0xcc/0x370 [ 48.573577][ T7312] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 48.579470][ T7312] RIP: 0033:0x47c530 [ 48.583365][ T7312] 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 [ 48.602951][ T7312] RSP: 002b:000000c4203377d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 48.611352][ T7312] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 48.619309][ T7312] RDX: 0000000000001000 RSI: 000000c4202ea000 RDI: 0000000000000003 [ 48.627268][ T7312] RBP: 000000c420337830 R08: 0000000000000000 R09: 0000000000000000 [ 48.635229][ T7312] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000010 [ 48.643179][ T7312] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 48.652691][ T7312] Kernel Offset: disabled [ 48.657027][ T7312] Rebooting in 86400 seconds..