[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 38.098489][ T26] audit: type=1800 audit(1571729017.826:25): pid=7005 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 38.125517][ T26] audit: type=1800 audit(1571729017.836:26): pid=7005 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 38.164865][ T26] audit: type=1800 audit(1571729017.836:27): pid=7005 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 '10.128.0.138' (ECDSA) to the list of known hosts. 2019/10/22 07:23:47 fuzzer started 2019/10/22 07:23:48 dialing manager at 10.128.0.105:37053 2019/10/22 07:23:48 syscalls: 2524 2019/10/22 07:23:48 code coverage: enabled 2019/10/22 07:23:48 comparison tracing: enabled 2019/10/22 07:23:48 extra coverage: extra coverage is not supported by the kernel 2019/10/22 07:23:48 setuid sandbox: enabled 2019/10/22 07:23:48 namespace sandbox: enabled 2019/10/22 07:23:48 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 07:23:48 fault injection: enabled 2019/10/22 07:23:48 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 07:23:48 net packet injection: enabled 2019/10/22 07:23:48 net device setup: enabled 2019/10/22 07:23:48 concurrency sanitizer: enabled syzkaller login: [ 49.877026][ T7157] ================================================================== [ 49.885714][ T7157] BUG: KCSAN: data-race in __nf_ct_refresh_acct / __nf_ct_refresh_acct [ 49.893921][ T7157] [ 49.896239][ T7157] read to 0xffff88811fda8708 of 4 bytes by interrupt on cpu 1: [ 49.903771][ T7157] __nf_ct_refresh_acct+0xd4/0x1b0 [ 49.908858][ T7157] nf_conntrack_tcp_packet+0xd40/0x3390 [ 49.914742][ T7157] nf_conntrack_in+0x410/0xa80 [ 49.920872][ T7157] ipv4_conntrack_in+0x27/0x40 [ 49.925614][ T7157] nf_hook_slow+0x83/0x160 [ 49.930006][ T7157] ip_rcv+0x12f/0x1a0 [ 49.933965][ T7157] __netif_receive_skb_one_core+0xa7/0xe0 [ 49.939660][ T7157] __netif_receive_skb+0x37/0xf0 [ 49.944576][ T7157] netif_receive_skb_internal+0x59/0x190 [ 49.950208][ T7157] napi_gro_receive+0x28f/0x330 [ 49.955755][ T7157] receive_buf+0x284/0x30b0 [ 49.960258][ T7157] virtnet_poll+0x436/0x7d0 [ 49.965836][ T7157] net_rx_action+0x3ae/0xa90 [ 49.970402][ T7157] __do_softirq+0x115/0x33f [ 49.974874][ T7157] [ 49.977190][ T7157] write to 0xffff88811fda8708 of 4 bytes by task 7157 on cpu 0: [ 49.984793][ T7157] __nf_ct_refresh_acct+0xfb/0x1b0 [ 49.989879][ T7157] nf_conntrack_tcp_packet+0xd40/0x3390 [ 49.995397][ T7157] nf_conntrack_in+0x410/0xa80 [ 50.000134][ T7157] ipv4_conntrack_local+0xbe/0x130 [ 50.005223][ T7157] nf_hook_slow+0x83/0x160 [ 50.009621][ T7157] __ip_local_out+0x1f7/0x2b0 [ 50.014855][ T7157] ip_local_out+0x31/0x90 [ 50.019513][ T7157] __ip_queue_xmit+0x3a8/0xa40 [ 50.024252][ T7157] ip_queue_xmit+0x45/0x60 [ 50.028640][ T7157] __tcp_transmit_skb+0xe81/0x1d60 [ 50.033723][ T7157] __tcp_send_ack+0x246/0x300 [ 50.038372][ T7157] tcp_send_ack+0x34/0x40 [ 50.042687][ T7157] tcp_cleanup_rbuf+0x130/0x360 [ 50.047503][ T7157] [ 50.049807][ T7157] Reported by Kernel Concurrency Sanitizer on: [ 50.055945][ T7157] CPU: 0 PID: 7157 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 50.063370][ T7157] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.073412][ T7157] ================================================================== [ 50.081460][ T7157] Kernel panic - not syncing: panic_on_warn set ... [ 50.088068][ T7157] CPU: 0 PID: 7157 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 50.095503][ T7157] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.105536][ T7157] Call Trace: [ 50.108808][ T7157] dump_stack+0xf5/0x159 [ 50.113054][ T7157] panic+0x210/0x640 [ 50.116952][ T7157] ? ip_queue_xmit+0x45/0x60 [ 50.121519][ T7157] ? vprintk_func+0x8d/0x140 [ 50.126110][ T7157] kcsan_report.cold+0xc/0x10 [ 50.130764][ T7157] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 50.136290][ T7157] __tsan_write4+0x32/0x40 [ 50.140696][ T7157] __nf_ct_refresh_acct+0xfb/0x1b0 [ 50.145784][ T7157] nf_conntrack_tcp_packet+0xd40/0x3390 [ 50.151323][ T7157] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 50.156935][ T7157] nf_conntrack_in+0x410/0xa80 [ 50.161679][ T7157] ipv4_conntrack_local+0xbe/0x130 [ 50.166771][ T7157] nf_hook_slow+0x83/0x160 [ 50.171162][ T7157] ? nf_ct_tcp_fixup+0xe0/0xe0 [ 50.175902][ T7157] __ip_local_out+0x1f7/0x2b0 [ 50.180568][ T7157] ? constant_test_bit+0x30/0x30 [ 50.185491][ T7157] ip_local_out+0x31/0x90 [ 50.189796][ T7157] __ip_queue_xmit+0x3a8/0xa40 [ 50.194536][ T7157] ip_queue_xmit+0x45/0x60 [ 50.198929][ T7157] __tcp_transmit_skb+0xe81/0x1d60 [ 50.204022][ T7157] __tcp_send_ack+0x246/0x300 [ 50.208674][ T7157] tcp_send_ack+0x34/0x40 [ 50.212980][ T7157] tcp_cleanup_rbuf+0x130/0x360 [ 50.217821][ T7157] tcp_recvmsg+0x633/0x1a30 [ 50.222306][ T7157] inet_recvmsg+0xbb/0x250 [ 50.226708][ T7157] ? __tsan_read8+0x2c/0x30 [ 50.231197][ T7157] ? inet_sendpage+0x100/0x100 [ 50.235940][ T7157] sock_recvmsg+0x92/0xb0 [ 50.240259][ T7157] sock_read_iter+0x15f/0x1e0 [ 50.244920][ T7157] new_sync_read+0x389/0x4f0 [ 50.249500][ T7157] __vfs_read+0xb1/0xc0 [ 50.253643][ T7157] vfs_read+0x143/0x2c0 [ 50.257777][ T7157] ksys_read+0xd5/0x1b0 [ 50.262007][ T7157] __x64_sys_read+0x4c/0x60 [ 50.266499][ T7157] do_syscall_64+0xcc/0x370 [ 50.270986][ T7157] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 50.276860][ T7157] RIP: 0033:0x47c530 [ 50.280793][ T7157] 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 [ 50.300378][ T7157] RSP: 002b:000000c42014b7d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 50.308851][ T7157] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 50.316798][ T7157] RDX: 0000000000001000 RSI: 000000c420136000 RDI: 0000000000000003 [ 50.324746][ T7157] RBP: 000000c42014b830 R08: 0000000000000000 R09: 0000000000000000 [ 50.332691][ T7157] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000007 [ 50.340640][ T7157] R13: 000000c420726df0 R14: 0000000000000004 R15: ffffffffffffffff [ 50.349664][ T7157] Kernel Offset: disabled [ 50.353989][ T7157] Rebooting in 86400 seconds..