[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.745412][ T26] audit: type=1800 audit(1570192663.051:25): pid=7000 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.792830][ T26] audit: type=1800 audit(1570192663.051:26): pid=7000 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.814838][ T26] audit: type=1800 audit(1570192663.051:27): pid=7000 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 '10.128.15.197' (ECDSA) to the list of known hosts. 2019/10/04 12:37:53 fuzzer started 2019/10/04 12:37:54 dialing manager at 10.128.0.105:38119 2019/10/04 12:37:54 syscalls: 2523 2019/10/04 12:37:54 code coverage: enabled 2019/10/04 12:37:54 comparison tracing: enabled 2019/10/04 12:37:54 extra coverage: extra coverage is not supported by the kernel 2019/10/04 12:37:54 setuid sandbox: enabled 2019/10/04 12:37:54 namespace sandbox: enabled 2019/10/04 12:37:54 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/04 12:37:54 fault injection: enabled 2019/10/04 12:37:54 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/04 12:37:54 net packet injection: enabled 2019/10/04 12:37:54 net device setup: enabled 2019/10/04 12:37:54 concurrency sanitizer: enabled syzkaller login: [ 47.594060][ T7157] ================================================================== [ 47.602294][ T7157] BUG: KCSAN: data-race in __nf_ct_refresh_acct+0xd4/0x1b0 and __nf_ct_refresh_acct+0xfb/0x1b0 [ 47.613303][ T7157] [ 47.615730][ T7157] read to 0xffff888124894608 of 4 bytes by interrupt on cpu 1: [ 47.623264][ T7157] __nf_ct_refresh_acct+0xd4/0x1b0 [ 47.628362][ T7157] nf_conntrack_tcp_packet+0xd40/0x3390 [ 47.633982][ T7157] nf_conntrack_in+0x410/0xaa0 [ 47.638745][ T7157] ipv4_conntrack_in+0x27/0x40 [ 47.643488][ T7157] nf_hook_slow+0x83/0x160 [ 47.647967][ T7157] ip_rcv+0x12f/0x1a0 [ 47.651943][ T7157] __netif_receive_skb_one_core+0xa7/0xe0 [ 47.657657][ T7157] __netif_receive_skb+0x37/0xf0 [ 47.662572][ T7157] netif_receive_skb_internal+0x59/0x190 [ 47.668179][ T7157] napi_gro_receive+0x28f/0x330 [ 47.673006][ T7157] receive_buf+0x284/0x30b0 [ 47.677501][ T7157] virtnet_poll+0x436/0x7d0 [ 47.681978][ T7157] net_rx_action+0x3ae/0xa50 [ 47.686549][ T7157] __do_softirq+0x115/0x33f [ 47.691021][ T7157] [ 47.693332][ T7157] write to 0xffff888124894608 of 4 bytes by task 7157 on cpu 0: [ 47.700937][ T7157] __nf_ct_refresh_acct+0xfb/0x1b0 [ 47.706024][ T7157] nf_conntrack_tcp_packet+0xd40/0x3390 [ 47.711568][ T7157] nf_conntrack_in+0x410/0xaa0 [ 47.716310][ T7157] ipv4_conntrack_local+0xbe/0x130 [ 47.721411][ T7157] nf_hook_slow+0x83/0x160 [ 47.725813][ T7157] __ip_local_out+0x1f7/0x2b0 [ 47.730467][ T7157] ip_local_out+0x31/0x90 [ 47.734773][ T7157] __ip_queue_xmit+0x3a8/0xa40 [ 47.739512][ T7157] ip_queue_xmit+0x45/0x60 [ 47.743907][ T7157] __tcp_transmit_skb+0xdeb/0x1cd0 [ 47.748995][ T7157] __tcp_send_ack+0x246/0x300 [ 47.753647][ T7157] tcp_send_ack+0x34/0x40 [ 47.757949][ T7157] tcp_cleanup_rbuf+0x130/0x360 [ 47.762768][ T7157] [ 47.765070][ T7157] Reported by Kernel Concurrency Sanitizer on: [ 47.771199][ T7157] CPU: 0 PID: 7157 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 47.778276][ T7157] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.788406][ T7157] ================================================================== [ 47.796441][ T7157] Kernel panic - not syncing: panic_on_warn set ... [ 47.803005][ T7157] CPU: 0 PID: 7157 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 47.810083][ T7157] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.820115][ T7157] Call Trace: [ 47.823389][ T7157] dump_stack+0xf5/0x159 [ 47.827612][ T7157] panic+0x209/0x639 [ 47.831486][ T7157] ? vprintk_func+0x8d/0x140 [ 47.836058][ T7157] kcsan_report.cold+0x57/0xeb [ 47.840825][ T7157] __kcsan_setup_watchpoint+0x342/0x500 [ 47.846366][ T7157] __tsan_write4+0x32/0x40 [ 47.850761][ T7157] __nf_ct_refresh_acct+0xfb/0x1b0 [ 47.855853][ T7157] nf_conntrack_tcp_packet+0xd40/0x3390 [ 47.861385][ T7157] nf_conntrack_in+0x410/0xaa0 [ 47.866132][ T7157] ipv4_conntrack_local+0xbe/0x130 [ 47.871247][ T7157] nf_hook_slow+0x83/0x160 [ 47.875647][ T7157] ? nf_ct_tcp_fixup+0xe0/0xe0 [ 47.880398][ T7157] __ip_local_out+0x1f7/0x2b0 [ 47.885060][ T7157] ? constant_test_bit+0x30/0x30 [ 47.889992][ T7157] ip_local_out+0x31/0x90 [ 47.894306][ T7157] __ip_queue_xmit+0x3a8/0xa40 [ 47.899052][ T7157] ip_queue_xmit+0x45/0x60 [ 47.903464][ T7157] __tcp_transmit_skb+0xdeb/0x1cd0 [ 47.908576][ T7157] __tcp_send_ack+0x246/0x300 [ 47.913236][ T7157] tcp_send_ack+0x34/0x40 [ 47.917543][ T7157] tcp_cleanup_rbuf+0x130/0x360 [ 47.922371][ T7157] tcp_recvmsg+0x633/0x1a30 [ 47.926859][ T7157] inet_recvmsg+0xbb/0x250 [ 47.931263][ T7157] ? __tsan_read8+0x2c/0x30 [ 47.935831][ T7157] ? inet_sendpage+0x100/0x100 [ 47.940574][ T7157] sock_recvmsg+0x92/0xb0 [ 47.944879][ T7157] sock_read_iter+0x15f/0x1e0 [ 47.949537][ T7157] new_sync_read+0x389/0x4f0 [ 47.954129][ T7157] __vfs_read+0xb1/0xc0 [ 47.958263][ T7157] vfs_read+0x143/0x2c0 [ 47.962401][ T7157] ksys_read+0xd5/0x1b0 [ 47.966534][ T7157] __x64_sys_read+0x4c/0x60 [ 47.971029][ T7157] do_syscall_64+0xcf/0x2f0 [ 47.975631][ T7157] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 47.981501][ T7157] RIP: 0033:0x47c530 [ 47.985380][ 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 [ 48.005072][ T7157] RSP: 002b:000000c4204fb7d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 48.013503][ T7157] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 48.021575][ T7157] RDX: 0000000000001000 RSI: 000000c4200a4000 RDI: 0000000000000003 [ 48.029532][ T7157] RBP: 000000c4204fb830 R08: 0000000000000000 R09: 0000000000000000 [ 48.037484][ T7157] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000080 [ 48.045528][ T7157] R13: ffffffffffffffff R14: 0000000000000020 R15: ffffffffffffffff [ 48.055124][ T7157] Kernel Offset: disabled [ 48.059455][ T7157] Rebooting in 86400 seconds..