[ 36.205838][ T25] audit: type=1800 audit(1572773587.394:25): pid=7088 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.243187][ T25] audit: type=1800 audit(1572773587.394:26): pid=7088 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.271693][ T25] audit: type=1800 audit(1572773587.394:27): pid=7088 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. [ 36.843502][ T7155] sshd (7155) used greatest stack depth: 10136 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.1.46' (ECDSA) to the list of known hosts. 2019/11/03 09:33:16 fuzzer started 2019/11/03 09:33:17 dialing manager at 10.128.0.105:43165 2019/11/03 09:33:18 syscalls: 2554 2019/11/03 09:33:18 code coverage: enabled 2019/11/03 09:33:18 comparison tracing: enabled 2019/11/03 09:33:18 extra coverage: extra coverage is not supported by the kernel 2019/11/03 09:33:18 setuid sandbox: enabled 2019/11/03 09:33:18 namespace sandbox: enabled 2019/11/03 09:33:18 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/03 09:33:18 fault injection: enabled 2019/11/03 09:33:18 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/03 09:33:18 net packet injection: enabled 2019/11/03 09:33:18 net device setup: enabled 2019/11/03 09:33:18 concurrency sanitizer: enabled 2019/11/03 09:33:22 adding functions to KCSAN blacklist: 'do_nanosleep' '__nf_conntrack_find_get' '__ext4_new_inode' 'tcp_add_backlog' 'rcu_gp_fqs_loop' 'snd_seq_check_queue' 'ktime_get_real_seconds' '__hrtimer_run_queues' '__tcp_select_window' 'run_timer_softirq' 'tcp_poll' 'generic_permission' 'tick_sched_do_timer' 'task_dump_owner' 'tomoyo_supervisor' syzkaller login: [ 52.349337][ T7239] ================================================================== [ 52.357494][ T7239] BUG: KCSAN: data-race in __nf_ct_refresh_acct / __nf_ct_refresh_acct [ 52.366212][ T7239] [ 52.368526][ T7239] read to 0xffff888124b65108 of 4 bytes by interrupt on cpu 1: [ 52.376145][ T7239] __nf_ct_refresh_acct+0xd4/0x1b0 [ 52.381283][ T7239] nf_conntrack_tcp_packet+0xd40/0x3390 [ 52.386822][ T7239] nf_conntrack_in+0x410/0xa80 [ 52.391651][ T7239] ipv4_conntrack_in+0x27/0x40 [ 52.396410][ T7239] nf_hook_slow+0x83/0x160 [ 52.400805][ T7239] ip_rcv+0x12f/0x1a0 [ 52.404765][ T7239] __netif_receive_skb_one_core+0xa7/0xe0 [ 52.410472][ T7239] __netif_receive_skb+0x37/0xf0 [ 52.415391][ T7239] netif_receive_skb_internal+0x59/0x190 [ 52.421010][ T7239] napi_gro_receive+0x28f/0x330 [ 52.425978][ T7239] receive_buf+0x284/0x30b0 [ 52.430469][ T7239] virtnet_poll+0x436/0x7d0 [ 52.434959][ T7239] net_rx_action+0x3ae/0xa90 [ 52.439545][ T7239] __do_softirq+0x115/0x33f [ 52.444024][ T7239] [ 52.446343][ T7239] write to 0xffff888124b65108 of 4 bytes by task 7239 on cpu 0: [ 52.453967][ T7239] __nf_ct_refresh_acct+0xfb/0x1b0 [ 52.459068][ T7239] nf_conntrack_tcp_packet+0xd40/0x3390 [ 52.464715][ T7239] nf_conntrack_in+0x410/0xa80 [ 52.469459][ T7239] ipv4_conntrack_local+0xbe/0x130 [ 52.474649][ T7239] nf_hook_slow+0x83/0x160 [ 52.479069][ T7239] __ip_local_out+0x1f7/0x2b0 [ 52.483728][ T7239] ip_local_out+0x31/0x90 [ 52.488038][ T7239] __ip_queue_xmit+0x3a8/0xa40 [ 52.492795][ T7239] ip_queue_xmit+0x45/0x60 [ 52.497203][ T7239] __tcp_transmit_skb+0xe81/0x1d60 [ 52.502290][ T7239] __tcp_send_ack+0x246/0x300 [ 52.507031][ T7239] tcp_send_ack+0x34/0x40 [ 52.511338][ T7239] tcp_cleanup_rbuf+0x130/0x360 [ 52.516157][ T7239] [ 52.518461][ T7239] Reported by Kernel Concurrency Sanitizer on: [ 52.524607][ T7239] CPU: 0 PID: 7239 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 52.532041][ T7239] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.542159][ T7239] ================================================================== [ 52.550211][ T7239] Kernel panic - not syncing: panic_on_warn set ... [ 52.556888][ T7239] CPU: 0 PID: 7239 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 52.564488][ T7239] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.574713][ T7239] Call Trace: [ 52.578075][ T7239] dump_stack+0xf5/0x159 [ 52.582311][ T7239] panic+0x210/0x640 [ 52.586191][ T7239] ? ip_queue_xmit+0x45/0x60 [ 52.591025][ T7239] ? vprintk_func+0x8d/0x140 [ 52.595687][ T7239] kcsan_report.cold+0xc/0x10 [ 52.600342][ T7239] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 52.605884][ T7239] __tsan_write4+0x32/0x40 [ 52.610285][ T7239] __nf_ct_refresh_acct+0xfb/0x1b0 [ 52.615500][ T7239] nf_conntrack_tcp_packet+0xd40/0x3390 [ 52.621153][ T7239] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 52.626988][ T7239] nf_conntrack_in+0x410/0xa80 [ 52.631751][ T7239] ipv4_conntrack_local+0xbe/0x130 [ 52.636868][ T7239] nf_hook_slow+0x83/0x160 [ 52.641262][ T7239] ? nf_ct_tcp_fixup+0xe0/0xe0 [ 52.646028][ T7239] __ip_local_out+0x1f7/0x2b0 [ 52.650773][ T7239] ? constant_test_bit+0x30/0x30 [ 52.655710][ T7239] ip_local_out+0x31/0x90 [ 52.660035][ T7239] __ip_queue_xmit+0x3a8/0xa40 [ 52.664878][ T7239] ip_queue_xmit+0x45/0x60 [ 52.669307][ T7239] __tcp_transmit_skb+0xe81/0x1d60 [ 52.674454][ T7239] __tcp_send_ack+0x246/0x300 [ 52.679140][ T7239] tcp_send_ack+0x34/0x40 [ 52.683467][ T7239] tcp_cleanup_rbuf+0x130/0x360 [ 52.688352][ T7239] tcp_recvmsg+0x633/0x1a30 [ 52.692859][ T7239] inet_recvmsg+0xbb/0x250 [ 52.697454][ T7239] ? __tsan_read8+0x2c/0x30 [ 52.701944][ T7239] ? inet_sendpage+0x100/0x100 [ 52.706949][ T7239] sock_recvmsg+0x92/0xb0 [ 52.711275][ T7239] sock_read_iter+0x15f/0x1e0 [ 52.715937][ T7239] new_sync_read+0x389/0x4f0 [ 52.720523][ T7239] __vfs_read+0xb1/0xc0 [ 52.724697][ T7239] vfs_read+0x143/0x2c0 [ 52.728846][ T7239] ksys_read+0xd5/0x1b0 [ 52.733013][ T7239] __x64_sys_read+0x4c/0x60 [ 52.737506][ T7239] do_syscall_64+0xcc/0x370 [ 52.742162][ T7239] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 52.748036][ T7239] RIP: 0033:0x47c530 [ 52.752038][ T7239] 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 [ 52.771710][ T7239] RSP: 002b:000000c4202cf810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 52.780113][ T7239] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 52.788065][ T7239] RDX: 0000000000001000 RSI: 000000c4203ea000 RDI: 0000000000000003 [ 52.796013][ T7239] RBP: 000000c4202cf868 R08: 0000000000000000 R09: 0000000000000000 [ 52.804054][ T7239] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008 [ 52.812005][ T7239] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 52.821693][ T7239] Kernel Offset: disabled [ 52.827944][ T7239] Rebooting in 86400 seconds..