[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.219821][ T26] audit: type=1800 audit(1571694524.496:25): pid=7017 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.247425][ T26] audit: type=1800 audit(1571694524.496:26): pid=7017 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.267457][ T26] audit: type=1800 audit(1571694524.496:27): pid=7017 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. 2019/10/21 21:48:52 fuzzer started 2019/10/21 21:48:54 dialing manager at 10.128.0.105:39747 2019/10/21 21:48:54 syscalls: 2524 2019/10/21 21:48:54 code coverage: enabled 2019/10/21 21:48:54 comparison tracing: enabled 2019/10/21 21:48:54 extra coverage: extra coverage is not supported by the kernel 2019/10/21 21:48:54 setuid sandbox: enabled 2019/10/21 21:48:54 namespace sandbox: enabled 2019/10/21 21:48:54 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/21 21:48:54 fault injection: enabled 2019/10/21 21:48:54 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/21 21:48:54 net packet injection: enabled 2019/10/21 21:48:54 net device setup: enabled 2019/10/21 21:48:54 concurrency sanitizer: enabled syzkaller login: [ 46.494726][ T7169] ================================================================== [ 46.502857][ T7169] BUG: KCSAN: data-race in __nf_ct_refresh_acct / __nf_ct_refresh_acct [ 46.511072][ T7169] [ 46.513377][ T7169] read to 0xffff88812a5c0608 of 4 bytes by interrupt on cpu 1: [ 46.520947][ T7169] __nf_ct_refresh_acct+0xd4/0x1b0 [ 46.526079][ T7169] nf_conntrack_tcp_packet+0xd40/0x3390 [ 46.531599][ T7169] nf_conntrack_in+0x410/0xa80 [ 46.536336][ T7169] ipv4_conntrack_in+0x27/0x40 [ 46.541117][ T7169] nf_hook_slow+0x83/0x160 [ 46.545507][ T7169] ip_rcv+0x12f/0x1a0 [ 46.549466][ T7169] __netif_receive_skb_one_core+0xa7/0xe0 [ 46.555160][ T7169] __netif_receive_skb+0x37/0xf0 [ 46.560072][ T7169] netif_receive_skb_internal+0x59/0x190 [ 46.565679][ T7169] napi_gro_receive+0x28f/0x330 [ 46.570503][ T7169] receive_buf+0x284/0x30b0 [ 46.574978][ T7169] virtnet_poll+0x436/0x7d0 [ 46.579495][ T7169] net_rx_action+0x3ae/0xa90 [ 46.584061][ T7169] __do_softirq+0x115/0x33f [ 46.588533][ T7169] [ 46.590842][ T7169] write to 0xffff88812a5c0608 of 4 bytes by task 7169 on cpu 0: [ 46.598485][ T7169] __nf_ct_refresh_acct+0xfb/0x1b0 [ 46.603572][ T7169] nf_conntrack_tcp_packet+0xd40/0x3390 [ 46.609093][ T7169] nf_conntrack_in+0x410/0xa80 [ 46.613830][ T7169] ipv4_conntrack_local+0xbe/0x130 [ 46.618925][ T7169] nf_hook_slow+0x83/0x160 [ 46.623316][ T7169] __ip_local_out+0x1f7/0x2b0 [ 46.627969][ T7169] ip_local_out+0x31/0x90 [ 46.632270][ T7169] __ip_queue_xmit+0x3a8/0xa40 [ 46.637019][ T7169] ip_queue_xmit+0x45/0x60 [ 46.641409][ T7169] __tcp_transmit_skb+0xe81/0x1d60 [ 46.646492][ T7169] __tcp_send_ack+0x246/0x300 [ 46.651144][ T7169] tcp_send_ack+0x34/0x40 [ 46.655448][ T7169] tcp_cleanup_rbuf+0x130/0x360 [ 46.660275][ T7169] [ 46.662573][ T7169] Reported by Kernel Concurrency Sanitizer on: [ 46.668701][ T7169] CPU: 0 PID: 7169 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 46.676134][ T7169] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.686162][ T7169] ================================================================== [ 46.694237][ T7169] Kernel panic - not syncing: panic_on_warn set ... [ 46.700808][ T7169] CPU: 0 PID: 7169 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 46.708233][ T7169] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.718278][ T7169] Call Trace: [ 46.721549][ T7169] dump_stack+0xf5/0x159 [ 46.725767][ T7169] panic+0x210/0x640 [ 46.729645][ T7169] ? ip_queue_xmit+0x45/0x60 [ 46.734224][ T7169] ? vprintk_func+0x8d/0x140 [ 46.738802][ T7169] kcsan_report.cold+0xc/0x10 [ 46.743459][ T7169] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 46.748987][ T7169] __tsan_write4+0x32/0x40 [ 46.753382][ T7169] __nf_ct_refresh_acct+0xfb/0x1b0 [ 46.758471][ T7169] nf_conntrack_tcp_packet+0xd40/0x3390 [ 46.764001][ T7169] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 46.769613][ T7169] nf_conntrack_in+0x410/0xa80 [ 46.774356][ T7169] ipv4_conntrack_local+0xbe/0x130 [ 46.779448][ T7169] nf_hook_slow+0x83/0x160 [ 46.783836][ T7169] ? nf_ct_tcp_fixup+0xe0/0xe0 [ 46.788575][ T7169] __ip_local_out+0x1f7/0x2b0 [ 46.793229][ T7169] ? constant_test_bit+0x30/0x30 [ 46.798148][ T7169] ip_local_out+0x31/0x90 [ 46.802458][ T7169] __ip_queue_xmit+0x3a8/0xa40 [ 46.807201][ T7169] ip_queue_xmit+0x45/0x60 [ 46.811592][ T7169] __tcp_transmit_skb+0xe81/0x1d60 [ 46.816695][ T7169] __tcp_send_ack+0x246/0x300 [ 46.821349][ T7169] tcp_send_ack+0x34/0x40 [ 46.825663][ T7169] tcp_cleanup_rbuf+0x130/0x360 [ 46.830490][ T7169] tcp_recvmsg+0x633/0x1a30 [ 46.834976][ T7169] inet_recvmsg+0xbb/0x250 [ 46.839366][ T7169] ? __tsan_read8+0x2c/0x30 [ 46.843842][ T7169] ? inet_sendpage+0x100/0x100 [ 46.848584][ T7169] sock_recvmsg+0x92/0xb0 [ 46.852891][ T7169] sock_read_iter+0x15f/0x1e0 [ 46.857553][ T7169] new_sync_read+0x389/0x4f0 [ 46.862124][ T7169] __vfs_read+0xb1/0xc0 [ 46.866254][ T7169] vfs_read+0x143/0x2c0 [ 46.870400][ T7169] ksys_read+0xd5/0x1b0 [ 46.874533][ T7169] __x64_sys_read+0x4c/0x60 [ 46.879013][ T7169] do_syscall_64+0xcc/0x370 [ 46.883494][ T7169] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 46.889370][ T7169] RIP: 0033:0x47c530 [ 46.893241][ T7169] 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 [ 46.912820][ T7169] RSP: 002b:000000c4203d37d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 46.921203][ T7169] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 46.929157][ T7169] RDX: 0000000000001000 RSI: 000000c42009c000 RDI: 0000000000000003 [ 46.937103][ T7169] RBP: 000000c4203d3830 R08: 0000000000000000 R09: 0000000000000000 [ 46.945049][ T7169] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000010 [ 46.952993][ T7169] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 46.962274][ T7169] Kernel Offset: disabled [ 46.966591][ T7169] Rebooting in 86400 seconds..