[ 36.878416][ T25] audit: type=1800 audit(1571903120.441:25): pid=7062 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.916662][ T25] audit: type=1800 audit(1571903120.441:26): pid=7062 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.965262][ T25] audit: type=1800 audit(1571903120.441:27): pid=7062 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. [ 37.353667][ T7129] sshd (7129) 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 '10.128.10.34' (ECDSA) to the list of known hosts. 2019/10/24 07:45:34 fuzzer started 2019/10/24 07:45:35 dialing manager at 10.128.0.105:42135 2019/10/24 07:45:35 syscalls: 2524 2019/10/24 07:45:35 code coverage: enabled 2019/10/24 07:45:35 comparison tracing: enabled 2019/10/24 07:45:35 extra coverage: extra coverage is not supported by the kernel 2019/10/24 07:45:35 setuid sandbox: enabled 2019/10/24 07:45:35 namespace sandbox: enabled 2019/10/24 07:45:35 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/24 07:45:35 fault injection: enabled 2019/10/24 07:45:35 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/24 07:45:35 net packet injection: enabled 2019/10/24 07:45:35 net device setup: enabled 2019/10/24 07:45:35 concurrency sanitizer: enabled 2019/10/24 07:45:37 adding functions to KCSAN blacklist: 'tick_do_update_jiffies64' '__tcp_select_window' 'tcp_add_backlog' 'do_nanosleep' 'tick_sched_do_timer' 'ep_poll' 'tcp_poll' 'generic_permission' 'find_next_bit' '__hrtimer_run_queues' syzkaller login: [ 57.149496][ T7231] ================================================================== [ 57.157644][ T7231] BUG: KCSAN: data-race in __nf_ct_refresh_acct / __nf_ct_refresh_acct [ 57.165854][ T7231] [ 57.168167][ T7231] read to 0xffff888122794908 of 4 bytes by interrupt on cpu 0: [ 57.175734][ T7231] __nf_ct_refresh_acct+0xd4/0x1b0 [ 57.180828][ T7231] nf_conntrack_tcp_packet+0xd40/0x3390 [ 57.186358][ T7231] nf_conntrack_in+0x410/0xa80 [ 57.191100][ T7231] ipv4_conntrack_in+0x27/0x40 [ 57.195842][ T7231] nf_hook_slow+0x83/0x160 [ 57.200236][ T7231] ip_rcv+0x12f/0x1a0 [ 57.204210][ T7231] __netif_receive_skb_one_core+0xa7/0xe0 [ 57.209920][ T7231] __netif_receive_skb+0x37/0xf0 [ 57.214833][ T7231] netif_receive_skb_internal+0x59/0x190 [ 57.220449][ T7231] napi_gro_receive+0x28f/0x330 [ 57.225275][ T7231] receive_buf+0x284/0x30b0 [ 57.230189][ T7231] virtnet_poll+0x436/0x7d0 [ 57.234668][ T7231] net_rx_action+0x3ae/0xa90 [ 57.239237][ T7231] __do_softirq+0x115/0x33f [ 57.243794][ T7231] [ 57.246102][ T7231] write to 0xffff888122794908 of 4 bytes by task 7231 on cpu 1: [ 57.253713][ T7231] __nf_ct_refresh_acct+0xfb/0x1b0 [ 57.258804][ T7231] nf_conntrack_tcp_packet+0xd40/0x3390 [ 57.264335][ T7231] nf_conntrack_in+0x410/0xa80 [ 57.269075][ T7231] ipv4_conntrack_local+0xbe/0x130 [ 57.274162][ T7231] nf_hook_slow+0x83/0x160 [ 57.278552][ T7231] __ip_local_out+0x1f7/0x2b0 [ 57.283293][ T7231] ip_local_out+0x31/0x90 [ 57.287595][ T7231] __ip_queue_xmit+0x3a8/0xa40 [ 57.292344][ T7231] ip_queue_xmit+0x45/0x60 [ 57.296734][ T7231] __tcp_transmit_skb+0xe81/0x1d60 [ 57.301819][ T7231] __tcp_send_ack+0x246/0x300 [ 57.306481][ T7231] tcp_send_ack+0x34/0x40 [ 57.310800][ T7231] tcp_cleanup_rbuf+0x130/0x360 [ 57.315631][ T7231] [ 57.317932][ T7231] Reported by Kernel Concurrency Sanitizer on: [ 57.324061][ T7231] CPU: 1 PID: 7231 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 57.331489][ T7231] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.341518][ T7231] ================================================================== [ 57.349554][ T7231] Kernel panic - not syncing: panic_on_warn set ... [ 57.356127][ T7231] CPU: 1 PID: 7231 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 57.363551][ T7231] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.373599][ T7231] Call Trace: [ 57.376885][ T7231] dump_stack+0xf5/0x159 [ 57.381107][ T7231] panic+0x210/0x640 [ 57.384983][ T7231] ? ip_queue_xmit+0x45/0x60 [ 57.389554][ T7231] ? vprintk_func+0x8d/0x140 [ 57.394130][ T7231] kcsan_report.cold+0xc/0x10 [ 57.398783][ T7231] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 57.404313][ T7231] __tsan_write4+0x32/0x40 [ 57.408721][ T7231] __nf_ct_refresh_acct+0xfb/0x1b0 [ 57.413823][ T7231] nf_conntrack_tcp_packet+0xd40/0x3390 [ 57.419538][ T7231] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 57.425176][ T7231] nf_conntrack_in+0x410/0xa80 [ 57.430060][ T7231] ipv4_conntrack_local+0xbe/0x130 [ 57.435246][ T7231] nf_hook_slow+0x83/0x160 [ 57.439835][ T7231] ? nf_ct_tcp_fixup+0xe0/0xe0 [ 57.444597][ T7231] __ip_local_out+0x1f7/0x2b0 [ 57.449252][ T7231] ? constant_test_bit+0x30/0x30 [ 57.454169][ T7231] ip_local_out+0x31/0x90 [ 57.458489][ T7231] __ip_queue_xmit+0x3a8/0xa40 [ 57.463239][ T7231] ip_queue_xmit+0x45/0x60 [ 57.467633][ T7231] __tcp_transmit_skb+0xe81/0x1d60 [ 57.472753][ T7231] __tcp_send_ack+0x246/0x300 [ 57.477423][ T7231] tcp_send_ack+0x34/0x40 [ 57.481755][ T7231] tcp_cleanup_rbuf+0x130/0x360 [ 57.486603][ T7231] tcp_recvmsg+0x633/0x1a30 [ 57.491105][ T7231] inet_recvmsg+0xbb/0x250 [ 57.495589][ T7231] ? __tsan_read8+0x2c/0x30 [ 57.500094][ T7231] ? inet_sendpage+0x100/0x100 [ 57.504845][ T7231] sock_recvmsg+0x92/0xb0 [ 57.509158][ T7231] sock_read_iter+0x15f/0x1e0 [ 57.513895][ T7231] new_sync_read+0x389/0x4f0 [ 57.518470][ T7231] __vfs_read+0xb1/0xc0 [ 57.522606][ T7231] vfs_read+0x143/0x2c0 [ 57.526829][ T7231] ksys_read+0xd5/0x1b0 [ 57.530993][ T7231] __x64_sys_read+0x4c/0x60 [ 57.535478][ T7231] do_syscall_64+0xcc/0x370 [ 57.539963][ T7231] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 57.545830][ T7231] RIP: 0033:0x47c530 [ 57.549704][ T7231] 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 [ 57.569432][ T7231] RSP: 002b:000000c4202fb7d0 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 57.577825][ T7231] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 57.585774][ T7231] RDX: 0000000000001000 RSI: 000000c4203e0000 RDI: 0000000000000003 [ 57.593747][ T7231] RBP: 000000c4202fb828 R08: 0000000000000000 R09: 0000000000000000 [ 57.601710][ T7231] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008 [ 57.609676][ T7231] R13: ffffffffffffffff R14: 0000000000000008 R15: ffffffffffffffff [ 57.619165][ T7231] Kernel Offset: disabled [ 57.623491][ T7231] Rebooting in 86400 seconds..