[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 38.477548][ T25] audit: type=1800 audit(1571683027.429:25): pid=7101 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 38.505840][ T25] audit: type=1800 audit(1571683027.429:26): pid=7101 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 38.542672][ T25] audit: type=1800 audit(1571683027.429:27): pid=7101 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 '10.128.10.22' (ECDSA) to the list of known hosts. 2019/10/21 18:37:17 fuzzer started 2019/10/21 18:37:18 dialing manager at 10.128.0.105:39747 2019/10/21 18:37:18 syscalls: 2524 2019/10/21 18:37:18 code coverage: enabled 2019/10/21 18:37:18 comparison tracing: enabled 2019/10/21 18:37:18 extra coverage: extra coverage is not supported by the kernel 2019/10/21 18:37:18 setuid sandbox: enabled 2019/10/21 18:37:18 namespace sandbox: enabled 2019/10/21 18:37:18 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/21 18:37:18 fault injection: enabled 2019/10/21 18:37:18 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/21 18:37:18 net packet injection: enabled 2019/10/21 18:37:18 net device setup: enabled 2019/10/21 18:37:18 concurrency sanitizer: enabled syzkaller login: [ 50.019894][ T7263] ================================================================== [ 50.028063][ T7263] BUG: KCSAN: data-race in __nf_ct_refresh_acct / __nf_ct_refresh_acct [ 50.036291][ T7263] [ 50.038805][ T7263] read to 0xffff888120db5708 of 4 bytes by interrupt on cpu 1: [ 50.046356][ T7263] __nf_ct_refresh_acct+0xd4/0x1b0 [ 50.051610][ T7263] nf_conntrack_tcp_packet+0xd40/0x3390 [ 50.057589][ T7263] nf_conntrack_in+0x410/0xa80 [ 50.062352][ T7263] ipv4_conntrack_in+0x27/0x40 [ 50.067272][ T7263] nf_hook_slow+0x83/0x160 [ 50.071665][ T7263] ip_rcv+0x12f/0x1a0 [ 50.075718][ T7263] __netif_receive_skb_one_core+0xa7/0xe0 [ 50.082479][ T7263] __netif_receive_skb+0x37/0xf0 [ 50.087700][ T7263] netif_receive_skb_internal+0x59/0x190 [ 50.096284][ T7263] napi_gro_receive+0x28f/0x330 [ 50.101338][ T7263] receive_buf+0x284/0x30b0 [ 50.106320][ T7263] virtnet_poll+0x436/0x7d0 [ 50.110914][ T7263] net_rx_action+0x3ae/0xa90 [ 50.115589][ T7263] __do_softirq+0x115/0x33f [ 50.120365][ T7263] [ 50.122701][ T7263] write to 0xffff888120db5708 of 4 bytes by task 7263 on cpu 0: [ 50.131462][ T7263] __nf_ct_refresh_acct+0xfb/0x1b0 [ 50.137302][ T7263] nf_conntrack_tcp_packet+0xd40/0x3390 [ 50.142877][ T7263] nf_conntrack_in+0x410/0xa80 [ 50.147645][ T7263] ipv4_conntrack_local+0xbe/0x130 [ 50.153374][ T7263] nf_hook_slow+0x83/0x160 [ 50.158303][ T7263] __ip_local_out+0x1f7/0x2b0 [ 50.163097][ T7263] ip_local_out+0x31/0x90 [ 50.168604][ T7263] __ip_queue_xmit+0x3a8/0xa40 [ 50.173531][ T7263] ip_queue_xmit+0x45/0x60 [ 50.177953][ T7263] __tcp_transmit_skb+0xe81/0x1d60 [ 50.183052][ T7263] __tcp_send_ack+0x246/0x300 [ 50.187712][ T7263] tcp_send_ack+0x34/0x40 [ 50.192055][ T7263] tcp_cleanup_rbuf+0x130/0x360 [ 50.197710][ T7263] [ 50.200018][ T7263] Reported by Kernel Concurrency Sanitizer on: [ 50.207278][ T7263] CPU: 0 PID: 7263 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 50.214746][ T7263] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.224894][ T7263] ================================================================== [ 50.233491][ T7263] Kernel panic - not syncing: panic_on_warn set ... [ 50.240268][ T7263] CPU: 0 PID: 7263 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 50.247932][ T7263] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.260676][ T7263] Call Trace: [ 50.264735][ T7263] dump_stack+0xf5/0x159 [ 50.269152][ T7263] panic+0x210/0x640 [ 50.273284][ T7263] ? ip_queue_xmit+0x45/0x60 [ 50.278104][ T7263] ? vprintk_func+0x8d/0x140 [ 50.283436][ T7263] kcsan_report.cold+0xc/0x10 [ 50.288382][ T7263] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 50.294356][ T7263] __tsan_write4+0x32/0x40 [ 50.298786][ T7263] __nf_ct_refresh_acct+0xfb/0x1b0 [ 50.303944][ T7263] nf_conntrack_tcp_packet+0xd40/0x3390 [ 50.310042][ T7263] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 50.315891][ T7263] nf_conntrack_in+0x410/0xa80 [ 50.321415][ T7263] ipv4_conntrack_local+0xbe/0x130 [ 50.327519][ T7263] nf_hook_slow+0x83/0x160 [ 50.332384][ T7263] ? nf_ct_tcp_fixup+0xe0/0xe0 [ 50.337430][ T7263] __ip_local_out+0x1f7/0x2b0 [ 50.342113][ T7263] ? constant_test_bit+0x30/0x30 [ 50.347031][ T7263] ip_local_out+0x31/0x90 [ 50.351343][ T7263] __ip_queue_xmit+0x3a8/0xa40 [ 50.356224][ T7263] ip_queue_xmit+0x45/0x60 [ 50.360780][ T7263] __tcp_transmit_skb+0xe81/0x1d60 [ 50.366559][ T7263] __tcp_send_ack+0x246/0x300 [ 50.371226][ T7263] tcp_send_ack+0x34/0x40 [ 50.375544][ T7263] tcp_cleanup_rbuf+0x130/0x360 [ 50.380496][ T7263] tcp_recvmsg+0x633/0x1a30 [ 50.384998][ T7263] inet_recvmsg+0xbb/0x250 [ 50.389393][ T7263] ? __tsan_read8+0x2c/0x30 [ 50.393890][ T7263] ? inet_sendpage+0x100/0x100 [ 50.398741][ T7263] sock_recvmsg+0x92/0xb0 [ 50.403079][ T7263] sock_read_iter+0x15f/0x1e0 [ 50.407752][ T7263] new_sync_read+0x389/0x4f0 [ 50.412651][ T7263] __vfs_read+0xb1/0xc0 [ 50.416906][ T7263] vfs_read+0x143/0x2c0 [ 50.421075][ T7263] ksys_read+0xd5/0x1b0 [ 50.425216][ T7263] __x64_sys_read+0x4c/0x60 [ 50.430942][ T7263] do_syscall_64+0xcc/0x370 [ 50.435447][ T7263] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 50.441333][ T7263] RIP: 0033:0x47c530 [ 50.445303][ T7263] 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 [ 50.465858][ T7263] RSP: 002b:000000c4204e3810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 50.474462][ T7263] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 50.482604][ T7263] RDX: 0000000000001000 RSI: 000000c4202d6000 RDI: 0000000000000003 [ 50.491841][ T7263] RBP: 000000c4204e3868 R08: 0000000000000000 R09: 0000000000000000 [ 50.500973][ T7263] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000200 [ 50.509098][ T7263] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 50.518769][ T7263] Kernel Offset: disabled [ 50.523764][ T7263] Rebooting in 86400 seconds..