[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.596033][ T26] audit: type=1800 audit(1572817044.148:25): pid=7168 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.623525][ T26] audit: type=1800 audit(1572817044.148:26): pid=7168 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.662996][ T26] audit: type=1800 audit(1572817044.158:27): pid=7168 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 '10.128.0.191' (ECDSA) to the list of known hosts. 2019/11/03 21:37:36 fuzzer started 2019/11/03 21:37:38 dialing manager at 10.128.0.105:42255 2019/11/03 21:37:39 syscalls: 2553 2019/11/03 21:37:39 code coverage: enabled 2019/11/03 21:37:39 comparison tracing: enabled 2019/11/03 21:37:39 extra coverage: extra coverage is not supported by the kernel 2019/11/03 21:37:39 setuid sandbox: enabled 2019/11/03 21:37:39 namespace sandbox: enabled 2019/11/03 21:37:39 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/03 21:37:39 fault injection: enabled 2019/11/03 21:37:39 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/03 21:37:39 net packet injection: enabled 2019/11/03 21:37:39 net device setup: enabled 2019/11/03 21:37:39 concurrency sanitizer: enabled 2019/11/03 21:37:39 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/11/03 21:37:43 adding functions to KCSAN blacklist: 'generic_permission' 'audit_log_start' 'find_next_bit' 'vm_area_dup' '__nf_conntrack_find_get' 'pid_update_inode' 'ktime_get_real_seconds' '__tcp_select_window' 'find_get_pages_range_tag' '__hrtimer_run_queues' 'tomoyo_supervisor' '__splice_from_pipe' 'blk_stat_add' 'blk_mq_sched_dispatch_requests' 'ep_poll' 'get_wchan' 'ext4_free_inode' 'tcp_add_backlog' 'generic_write_end' 'blk_mq_get_request' 'tcp_poll' 'tick_sched_do_timer' 'tick_do_update_jiffies64' 'generic_fillattr' syzkaller login: [ 56.989444][ T7338] ================================================================== [ 56.997724][ T7338] BUG: KCSAN: data-race in __nf_ct_refresh_acct / __nf_ct_refresh_acct [ 57.007290][ T7338] [ 57.009597][ T7338] read to 0xffff888124049a08 of 4 bytes by interrupt on cpu 1: [ 57.024670][ T7338] __nf_ct_refresh_acct+0xd4/0x1b0 [ 57.029758][ T7338] nf_conntrack_tcp_packet+0xd40/0x3390 [ 57.035282][ T7338] nf_conntrack_in+0x410/0xa80 [ 57.040020][ T7338] ipv4_conntrack_in+0x27/0x40 [ 57.044761][ T7338] nf_hook_slow+0x83/0x160 [ 57.049149][ T7338] ip_rcv+0x12f/0x1a0 [ 57.053131][ T7338] __netif_receive_skb_one_core+0xa7/0xe0 [ 57.058827][ T7338] __netif_receive_skb+0x37/0xf0 [ 57.095213][ T7338] netif_receive_skb_internal+0x59/0x190 [ 57.100822][ T7338] napi_gro_receive+0x28f/0x330 [ 57.105673][ T7338] receive_buf+0x284/0x30b0 [ 57.110154][ T7338] virtnet_poll+0x436/0x7d0 [ 57.114636][ T7338] net_rx_action+0x3ae/0xa90 [ 57.119203][ T7338] __do_softirq+0x115/0x33f [ 57.124719][ T7338] [ 57.127052][ T7338] write to 0xffff888124049a08 of 4 bytes by task 7338 on cpu 0: [ 57.134669][ T7338] __nf_ct_refresh_acct+0xfb/0x1b0 [ 57.139755][ T7338] nf_conntrack_tcp_packet+0xd40/0x3390 [ 57.145289][ T7338] nf_conntrack_in+0x410/0xa80 [ 57.150028][ T7338] ipv4_conntrack_local+0xbe/0x130 [ 57.155118][ T7338] nf_hook_slow+0x83/0x160 [ 57.159608][ T7338] __ip_local_out+0x1f7/0x2b0 [ 57.164259][ T7338] ip_local_out+0x31/0x90 [ 57.168650][ T7338] __ip_queue_xmit+0x3a8/0xa40 [ 57.173396][ T7338] ip_queue_xmit+0x45/0x60 [ 57.177788][ T7338] __tcp_transmit_skb+0xe81/0x1d60 [ 57.182875][ T7338] __tcp_send_ack+0x246/0x300 [ 57.187539][ T7338] tcp_send_ack+0x34/0x40 [ 57.191844][ T7338] tcp_cleanup_rbuf+0x130/0x360 [ 57.197271][ T7338] [ 57.199573][ T7338] Reported by Kernel Concurrency Sanitizer on: [ 57.205715][ T7338] CPU: 0 PID: 7338 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 57.213141][ T7338] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.223185][ T7338] ================================================================== [ 57.231218][ T7338] Kernel panic - not syncing: panic_on_warn set ... [ 57.238300][ T7338] CPU: 0 PID: 7338 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 57.245729][ T7338] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.255770][ T7338] Call Trace: [ 57.259041][ T7338] dump_stack+0xf5/0x159 [ 57.263261][ T7338] panic+0x210/0x640 [ 57.267150][ T7338] ? ip_queue_xmit+0x45/0x60 [ 57.271976][ T7338] ? vprintk_func+0x8d/0x140 [ 57.276544][ T7338] kcsan_report.cold+0xc/0x10 [ 57.281200][ T7338] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 57.286722][ T7338] __tsan_write4+0x32/0x40 [ 57.291120][ T7338] __nf_ct_refresh_acct+0xfb/0x1b0 [ 57.296220][ T7338] nf_conntrack_tcp_packet+0xd40/0x3390 [ 57.301750][ T7338] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 57.307562][ T7338] nf_conntrack_in+0x410/0xa80 [ 57.312311][ T7338] ipv4_conntrack_local+0xbe/0x130 [ 57.317501][ T7338] nf_hook_slow+0x83/0x160 [ 57.321904][ T7338] ? nf_ct_tcp_fixup+0xe0/0xe0 [ 57.326661][ T7338] __ip_local_out+0x1f7/0x2b0 [ 57.331318][ T7338] ? constant_test_bit+0x30/0x30 [ 57.336245][ T7338] ip_local_out+0x31/0x90 [ 57.340553][ T7338] __ip_queue_xmit+0x3a8/0xa40 [ 57.345298][ T7338] ip_queue_xmit+0x45/0x60 [ 57.350040][ T7338] __tcp_transmit_skb+0xe81/0x1d60 [ 57.355569][ T7338] __tcp_send_ack+0x246/0x300 [ 57.360335][ T7338] tcp_send_ack+0x34/0x40 [ 57.364642][ T7338] tcp_cleanup_rbuf+0x130/0x360 [ 57.369482][ T7338] tcp_recvmsg+0x633/0x1a30 [ 57.373975][ T7338] inet_recvmsg+0xbb/0x250 [ 57.378384][ T7338] ? __tsan_read8+0x2c/0x30 [ 57.382865][ T7338] ? inet_sendpage+0x100/0x100 [ 57.388127][ T7338] sock_recvmsg+0x92/0xb0 [ 57.392435][ T7338] sock_read_iter+0x15f/0x1e0 [ 57.397105][ T7338] new_sync_read+0x389/0x4f0 [ 57.401680][ T7338] __vfs_read+0xb1/0xc0 [ 57.405817][ T7338] vfs_read+0x143/0x2c0 [ 57.410225][ T7338] ksys_read+0xd5/0x1b0 [ 57.414460][ T7338] __x64_sys_read+0x4c/0x60 [ 57.418944][ T7338] do_syscall_64+0xcc/0x370 [ 57.423534][ T7338] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 57.429403][ T7338] RIP: 0033:0x47c530 [ 57.433277][ T7338] 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 [ 57.453724][ T7338] RSP: 002b:000000c4202d57d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 57.462214][ T7338] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 57.470177][ T7338] RDX: 0000000000001000 RSI: 000000c420252000 RDI: 0000000000000003 [ 57.478133][ T7338] RBP: 000000c4202d5830 R08: 0000000000000000 R09: 0000000000000000 [ 57.486169][ T7338] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000010 [ 57.494137][ T7338] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 57.503588][ T7338] Kernel Offset: disabled [ 57.508013][ T7338] Rebooting in 86400 seconds..