[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.402170][ T26] audit: type=1800 audit(1571698295.988:25): pid=7004 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.448788][ T26] audit: type=1800 audit(1571698295.988:26): pid=7004 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.469803][ T26] audit: type=1800 audit(1571698295.988:27): pid=7004 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 '10.128.1.6' (ECDSA) to the list of known hosts. 2019/10/21 22:51:47 fuzzer started 2019/10/21 22:51:48 dialing manager at 10.128.0.105:39747 2019/10/21 22:51:48 syscalls: 2524 2019/10/21 22:51:48 code coverage: enabled 2019/10/21 22:51:48 comparison tracing: enabled 2019/10/21 22:51:48 extra coverage: extra coverage is not supported by the kernel 2019/10/21 22:51:48 setuid sandbox: enabled 2019/10/21 22:51:48 namespace sandbox: enabled 2019/10/21 22:51:48 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/21 22:51:48 fault injection: enabled 2019/10/21 22:51:48 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/21 22:51:48 net packet injection: enabled 2019/10/21 22:51:48 net device setup: enabled 2019/10/21 22:51:48 concurrency sanitizer: enabled syzkaller login: [ 49.101848][ T7159] ================================================================== [ 49.109989][ T7159] BUG: KCSAN: data-race in __nf_ct_refresh_acct / __nf_ct_refresh_acct [ 49.118216][ T7159] [ 49.120538][ T7159] read to 0xffff888123254c08 of 4 bytes by interrupt on cpu 0: [ 49.128079][ T7159] __nf_ct_refresh_acct+0xd4/0x1b0 [ 49.133173][ T7159] nf_conntrack_tcp_packet+0xd40/0x3390 [ 49.138701][ T7159] nf_conntrack_in+0x410/0xa80 [ 49.143499][ T7159] ipv4_conntrack_in+0x27/0x40 [ 49.148281][ T7159] nf_hook_slow+0x83/0x160 [ 49.152672][ T7159] ip_rcv+0x12f/0x1a0 [ 49.156662][ T7159] __netif_receive_skb_one_core+0xa7/0xe0 [ 49.162355][ T7159] __netif_receive_skb+0x37/0xf0 [ 49.167308][ T7159] netif_receive_skb_internal+0x59/0x190 [ 49.172913][ T7159] napi_gro_receive+0x28f/0x330 [ 49.177736][ T7159] receive_buf+0x284/0x30b0 [ 49.182226][ T7159] virtnet_poll+0x436/0x7d0 [ 49.186714][ T7159] net_rx_action+0x3ae/0xa90 [ 49.191337][ T7159] __do_softirq+0x115/0x33f [ 49.195824][ T7159] [ 49.198134][ T7159] write to 0xffff888123254c08 of 4 bytes by task 7159 on cpu 1: [ 49.205744][ T7159] __nf_ct_refresh_acct+0xfb/0x1b0 [ 49.210832][ T7159] nf_conntrack_tcp_packet+0xd40/0x3390 [ 49.216393][ T7159] nf_conntrack_in+0x410/0xa80 [ 49.221132][ T7159] ipv4_conntrack_local+0xbe/0x130 [ 49.226219][ T7159] nf_hook_slow+0x83/0x160 [ 49.230611][ T7159] __ip_local_out+0x1f7/0x2b0 [ 49.235301][ T7159] ip_local_out+0x31/0x90 [ 49.239604][ T7159] __ip_queue_xmit+0x3a8/0xa40 [ 49.244353][ T7159] ip_queue_xmit+0x45/0x60 [ 49.248756][ T7159] __tcp_transmit_skb+0xe81/0x1d60 [ 49.253844][ T7159] __tcp_send_ack+0x246/0x300 [ 49.258495][ T7159] tcp_send_ack+0x34/0x40 [ 49.262816][ T7159] tcp_cleanup_rbuf+0x130/0x360 [ 49.267632][ T7159] [ 49.269935][ T7159] Reported by Kernel Concurrency Sanitizer on: [ 49.276074][ T7159] CPU: 1 PID: 7159 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 49.283501][ T7159] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.293533][ T7159] ================================================================== [ 49.301579][ T7159] Kernel panic - not syncing: panic_on_warn set ... [ 49.308140][ T7159] CPU: 1 PID: 7159 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 49.315577][ T7159] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.325603][ T7159] Call Trace: [ 49.328875][ T7159] dump_stack+0xf5/0x159 [ 49.333107][ T7159] panic+0x210/0x640 [ 49.336992][ T7159] ? ip_queue_xmit+0x45/0x60 [ 49.341570][ T7159] ? vprintk_func+0x8d/0x140 [ 49.346136][ T7159] kcsan_report.cold+0xc/0x10 [ 49.350788][ T7159] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 49.356307][ T7159] __tsan_write4+0x32/0x40 [ 49.360702][ T7159] __nf_ct_refresh_acct+0xfb/0x1b0 [ 49.365813][ T7159] nf_conntrack_tcp_packet+0xd40/0x3390 [ 49.371363][ T7159] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 49.376974][ T7159] nf_conntrack_in+0x410/0xa80 [ 49.381738][ T7159] ipv4_conntrack_local+0xbe/0x130 [ 49.386828][ T7159] nf_hook_slow+0x83/0x160 [ 49.391216][ T7159] ? nf_ct_tcp_fixup+0xe0/0xe0 [ 49.395958][ T7159] __ip_local_out+0x1f7/0x2b0 [ 49.400621][ T7159] ? constant_test_bit+0x30/0x30 [ 49.405536][ T7159] ip_local_out+0x31/0x90 [ 49.409852][ T7159] __ip_queue_xmit+0x3a8/0xa40 [ 49.414596][ T7159] ip_queue_xmit+0x45/0x60 [ 49.418987][ T7159] __tcp_transmit_skb+0xe81/0x1d60 [ 49.424082][ T7159] __tcp_send_ack+0x246/0x300 [ 49.428736][ T7159] tcp_send_ack+0x34/0x40 [ 49.433043][ T7159] tcp_cleanup_rbuf+0x130/0x360 [ 49.437882][ T7159] tcp_recvmsg+0x633/0x1a30 [ 49.442391][ T7159] inet_recvmsg+0xbb/0x250 [ 49.446785][ T7159] ? __tsan_read8+0x2c/0x30 [ 49.451264][ T7159] ? inet_sendpage+0x100/0x100 [ 49.456091][ T7159] sock_recvmsg+0x92/0xb0 [ 49.460398][ T7159] sock_read_iter+0x15f/0x1e0 [ 49.465058][ T7159] new_sync_read+0x389/0x4f0 [ 49.469628][ T7159] __vfs_read+0xb1/0xc0 [ 49.473770][ T7159] vfs_read+0x143/0x2c0 [ 49.477916][ T7159] ksys_read+0xd5/0x1b0 [ 49.482054][ T7159] __x64_sys_read+0x4c/0x60 [ 49.486543][ T7159] do_syscall_64+0xcc/0x370 [ 49.491030][ T7159] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.496900][ T7159] RIP: 0033:0x47c530 [ 49.500778][ T7159] 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 [ 49.520369][ T7159] RSP: 002b:000000c4204fc850 EFLAGS: 00000206 ORIG_RAX: 0000000000000000 [ 49.528756][ T7159] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 49.536702][ T7159] RDX: 0000000000001000 RSI: 000000c420396000 RDI: 0000000000000003 [ 49.544684][ T7159] RBP: 000000c4204fc8a8 R08: 0000000000000000 R09: 0000000000000000 [ 49.552631][ T7159] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000010 [ 49.560619][ T7159] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 49.570081][ T7159] Kernel Offset: disabled [ 49.574447][ T7159] Rebooting in 86400 seconds..