[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 33.810516][ T26] audit: type=1800 audit(1572729130.623:25): pid=7068 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 33.845844][ T26] audit: type=1800 audit(1572729130.623:26): pid=7068 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 33.867557][ T26] audit: type=1800 audit(1572729130.623:27): pid=7068 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 '10.128.0.169' (ECDSA) to the list of known hosts. 2019/11/02 21:12:21 fuzzer started 2019/11/02 21:12:23 dialing manager at 10.128.0.105:46001 2019/11/02 21:12:23 syscalls: 2554 2019/11/02 21:12:23 code coverage: enabled 2019/11/02 21:12:23 comparison tracing: enabled 2019/11/02 21:12:23 extra coverage: extra coverage is not supported by the kernel 2019/11/02 21:12:23 setuid sandbox: enabled 2019/11/02 21:12:23 namespace sandbox: enabled 2019/11/02 21:12:23 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/02 21:12:23 fault injection: enabled 2019/11/02 21:12:23 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/02 21:12:23 net packet injection: enabled 2019/11/02 21:12:23 net device setup: enabled 2019/11/02 21:12:23 concurrency sanitizer: enabled syzkaller login: [ 47.853900][ T7236] KCSAN: could not find function: 'poll_schedule_timeout' 2019/11/02 21:12:27 adding functions to KCSAN blacklist: 'vm_area_dup' 'taskstats_exit' 'generic_permission' 'rcu_gp_fqs_check_wake' 'tcp_add_backlog' 'poll_schedule_timeout' 'ext4_xattr_get' 'pipe_poll' 'tomoyo_supervisor' 'add_timer' 'ktime_get_real_seconds' '__nf_conntrack_find_get' 'find_next_bit' 'task_dump_owner' 'mod_timer' 'generic_write_end' 'tcp_poll' 'pcpu_alloc' '__hrtimer_run_queues' '__tcp_select_window' 'ep_poll' [ 51.669102][ T7235] ================================================================== [ 51.677247][ T7235] BUG: KCSAN: data-race in __nf_ct_refresh_acct / __nf_ct_refresh_acct [ 51.686166][ T7235] [ 51.688489][ T7235] read to 0xffff888122653208 of 4 bytes by interrupt on cpu 0: [ 51.696133][ T7235] __nf_ct_refresh_acct+0xd4/0x1b0 [ 51.701219][ T7235] nf_conntrack_tcp_packet+0xd40/0x3390 [ 51.706903][ T7235] nf_conntrack_in+0x410/0xa80 [ 51.711644][ T7235] ipv4_conntrack_in+0x27/0x40 [ 51.716384][ T7235] nf_hook_slow+0x83/0x160 [ 51.720771][ T7235] ip_rcv+0x12f/0x1a0 [ 51.724729][ T7235] __netif_receive_skb_one_core+0xa7/0xe0 [ 51.730685][ T7235] __netif_receive_skb+0x37/0xf0 [ 51.735602][ T7235] netif_receive_skb_internal+0x59/0x190 [ 51.741217][ T7235] napi_gro_receive+0x28f/0x330 [ 51.746045][ T7235] receive_buf+0x284/0x30b0 [ 51.750521][ T7235] virtnet_poll+0x436/0x7d0 [ 51.755139][ T7235] net_rx_action+0x3ae/0xa90 [ 51.760326][ T7235] __do_softirq+0x115/0x33f [ 51.764798][ T7235] [ 51.767108][ T7235] write to 0xffff888122653208 of 4 bytes by task 7235 on cpu 1: [ 51.774867][ T7235] __nf_ct_refresh_acct+0xfb/0x1b0 [ 51.779963][ T7235] nf_conntrack_tcp_packet+0xd40/0x3390 [ 51.785486][ T7235] nf_conntrack_in+0x410/0xa80 [ 51.790226][ T7235] ipv4_conntrack_local+0xbe/0x130 [ 51.795314][ T7235] nf_hook_slow+0x83/0x160 [ 51.799705][ T7235] __ip_local_out+0x1f7/0x2b0 [ 51.804369][ T7235] ip_local_out+0x31/0x90 [ 51.808691][ T7235] __ip_queue_xmit+0x3a8/0xa40 [ 51.813437][ T7235] ip_queue_xmit+0x45/0x60 [ 51.817833][ T7235] __tcp_transmit_skb+0xe81/0x1d60 [ 51.822930][ T7235] __tcp_send_ack+0x246/0x300 [ 51.827581][ T7235] tcp_send_ack+0x34/0x40 [ 51.831886][ T7235] tcp_cleanup_rbuf+0x130/0x360 [ 51.836706][ T7235] [ 51.839008][ T7235] Reported by Kernel Concurrency Sanitizer on: [ 51.845151][ T7235] CPU: 1 PID: 7235 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 51.852591][ T7235] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.862647][ T7235] ================================================================== [ 51.870683][ T7235] Kernel panic - not syncing: panic_on_warn set ... [ 51.877245][ T7235] CPU: 1 PID: 7235 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 51.884674][ T7235] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.894705][ T7235] Call Trace: [ 51.898324][ T7235] dump_stack+0xf5/0x159 [ 51.902558][ T7235] panic+0x210/0x640 [ 51.906432][ T7235] ? ip_queue_xmit+0x45/0x60 [ 51.911002][ T7235] ? vprintk_func+0x8d/0x140 [ 51.915572][ T7235] kcsan_report.cold+0xc/0x10 [ 51.920332][ T7235] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 51.925855][ T7235] __tsan_write4+0x32/0x40 [ 51.930513][ T7235] __nf_ct_refresh_acct+0xfb/0x1b0 [ 51.935627][ T7235] nf_conntrack_tcp_packet+0xd40/0x3390 [ 51.941157][ T7235] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 51.946771][ T7235] nf_conntrack_in+0x410/0xa80 [ 51.951520][ T7235] ipv4_conntrack_local+0xbe/0x130 [ 51.956612][ T7235] nf_hook_slow+0x83/0x160 [ 51.961022][ T7235] ? nf_ct_tcp_fixup+0xe0/0xe0 [ 51.965783][ T7235] __ip_local_out+0x1f7/0x2b0 [ 51.970436][ T7235] ? constant_test_bit+0x30/0x30 [ 51.975352][ T7235] ip_local_out+0x31/0x90 [ 51.979659][ T7235] __ip_queue_xmit+0x3a8/0xa40 [ 51.984402][ T7235] ip_queue_xmit+0x45/0x60 [ 51.988793][ T7235] __tcp_transmit_skb+0xe81/0x1d60 [ 51.993974][ T7235] __tcp_send_ack+0x246/0x300 [ 51.998626][ T7235] tcp_send_ack+0x34/0x40 [ 52.002947][ T7235] tcp_cleanup_rbuf+0x130/0x360 [ 52.007777][ T7235] tcp_recvmsg+0x633/0x1a30 [ 52.012278][ T7235] inet_recvmsg+0xbb/0x250 [ 52.016682][ T7235] ? __tsan_read8+0x2c/0x30 [ 52.021160][ T7235] ? inet_sendpage+0x100/0x100 [ 52.026003][ T7235] sock_recvmsg+0x92/0xb0 [ 52.030329][ T7235] sock_read_iter+0x15f/0x1e0 [ 52.034988][ T7235] new_sync_read+0x389/0x4f0 [ 52.039560][ T7235] __vfs_read+0xb1/0xc0 [ 52.043706][ T7235] vfs_read+0x143/0x2c0 [ 52.047943][ T7235] ksys_read+0xd5/0x1b0 [ 52.052164][ T7235] __x64_sys_read+0x4c/0x60 [ 52.056652][ T7235] do_syscall_64+0xcc/0x370 [ 52.061137][ T7235] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 52.067091][ T7235] RIP: 0033:0x47c530 [ 52.070967][ T7235] 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 [ 52.090561][ T7235] RSP: 002b:000000c4202fb810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 52.098948][ T7235] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 52.106894][ T7235] RDX: 0000000000001000 RSI: 000000c42031a000 RDI: 0000000000000003 [ 52.114842][ T7235] RBP: 000000c4202fb868 R08: 0000000000000000 R09: 0000000000000000 [ 52.122802][ T7235] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000004 [ 52.130761][ T7235] R13: ffffffffffffffff R14: 0000000000000004 R15: ffffffffffffffff [ 52.140087][ T7235] Kernel Offset: disabled [ 52.144406][ T7235] Rebooting in 86400 seconds..