[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.368919][ T26] audit: type=1800 audit(1571745081.518:25): pid=6967 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.420902][ T26] audit: type=1800 audit(1571745081.518:26): pid=6967 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.445226][ T26] audit: type=1800 audit(1571745081.518:27): pid=6967 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. 2019/10/22 11:51:29 fuzzer started 2019/10/22 11:51:30 dialing manager at 10.128.0.105:37053 2019/10/22 11:51:30 syscalls: 2524 2019/10/22 11:51:30 code coverage: enabled 2019/10/22 11:51:30 comparison tracing: enabled 2019/10/22 11:51:30 extra coverage: extra coverage is not supported by the kernel 2019/10/22 11:51:30 setuid sandbox: enabled 2019/10/22 11:51:30 namespace sandbox: enabled 2019/10/22 11:51:30 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 11:51:30 fault injection: enabled 2019/10/22 11:51:30 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 11:51:30 net packet injection: enabled 2019/10/22 11:51:30 net device setup: enabled 2019/10/22 11:51:30 concurrency sanitizer: enabled syzkaller login: [ 46.276762][ T7136] ================================================================== [ 46.284906][ T7136] BUG: KCSAN: data-race in __nf_ct_refresh_acct / __nf_ct_refresh_acct [ 46.293127][ T7136] [ 46.295443][ T7136] read to 0xffff8881248e7a08 of 4 bytes by interrupt on cpu 1: [ 46.302965][ T7136] __nf_ct_refresh_acct+0xd4/0x1b0 [ 46.308104][ T7136] nf_conntrack_tcp_packet+0xd40/0x3390 [ 46.313623][ T7136] nf_conntrack_in+0x410/0xa80 [ 46.318456][ T7136] ipv4_conntrack_in+0x27/0x40 [ 46.323329][ T7136] nf_hook_slow+0x83/0x160 [ 46.327726][ T7136] ip_rcv+0x12f/0x1a0 [ 46.331688][ T7136] __netif_receive_skb_one_core+0xa7/0xe0 [ 46.337423][ T7136] __netif_receive_skb+0x37/0xf0 [ 46.342376][ T7136] netif_receive_skb_internal+0x59/0x190 [ 46.348022][ T7136] napi_gro_receive+0x28f/0x330 [ 46.352846][ T7136] receive_buf+0x284/0x30b0 [ 46.357355][ T7136] virtnet_poll+0x436/0x7d0 [ 46.361869][ T7136] net_rx_action+0x3ae/0xa90 [ 46.366469][ T7136] __do_softirq+0x115/0x33f [ 46.370939][ T7136] [ 46.373243][ T7136] write to 0xffff8881248e7a08 of 4 bytes by task 7136 on cpu 0: [ 46.380859][ T7136] __nf_ct_refresh_acct+0xfb/0x1b0 [ 46.385944][ T7136] nf_conntrack_tcp_packet+0xd40/0x3390 [ 46.391463][ T7136] nf_conntrack_in+0x410/0xa80 [ 46.396221][ T7136] ipv4_conntrack_local+0xbe/0x130 [ 46.401323][ T7136] nf_hook_slow+0x83/0x160 [ 46.405726][ T7136] __ip_local_out+0x1f7/0x2b0 [ 46.410386][ T7136] ip_local_out+0x31/0x90 [ 46.414692][ T7136] __ip_queue_xmit+0x3a8/0xa40 [ 46.419430][ T7136] ip_queue_xmit+0x45/0x60 [ 46.423832][ T7136] __tcp_transmit_skb+0xe81/0x1d60 [ 46.428917][ T7136] __tcp_send_ack+0x246/0x300 [ 46.433570][ T7136] tcp_send_ack+0x34/0x40 [ 46.437884][ T7136] tcp_cleanup_rbuf+0x130/0x360 [ 46.442705][ T7136] [ 46.445014][ T7136] Reported by Kernel Concurrency Sanitizer on: [ 46.451144][ T7136] CPU: 0 PID: 7136 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 46.458570][ T7136] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.468601][ T7136] ================================================================== [ 46.476647][ T7136] Kernel panic - not syncing: panic_on_warn set ... [ 46.483218][ T7136] CPU: 0 PID: 7136 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 46.490656][ T7136] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.500685][ T7136] Call Trace: [ 46.503955][ T7136] dump_stack+0xf5/0x159 [ 46.508179][ T7136] panic+0x210/0x640 [ 46.512061][ T7136] ? ip_queue_xmit+0x45/0x60 [ 46.516628][ T7136] ? vprintk_func+0x8d/0x140 [ 46.521198][ T7136] kcsan_report.cold+0xc/0x10 [ 46.525852][ T7136] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 46.531374][ T7136] __tsan_write4+0x32/0x40 [ 46.535771][ T7136] __nf_ct_refresh_acct+0xfb/0x1b0 [ 46.540861][ T7136] nf_conntrack_tcp_packet+0xd40/0x3390 [ 46.546393][ T7136] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 46.552007][ T7136] nf_conntrack_in+0x410/0xa80 [ 46.556751][ T7136] ipv4_conntrack_local+0xbe/0x130 [ 46.561844][ T7136] nf_hook_slow+0x83/0x160 [ 46.566245][ T7136] ? nf_ct_tcp_fixup+0xe0/0xe0 [ 46.571009][ T7136] __ip_local_out+0x1f7/0x2b0 [ 46.575663][ T7136] ? constant_test_bit+0x30/0x30 [ 46.580590][ T7136] ip_local_out+0x31/0x90 [ 46.584896][ T7136] __ip_queue_xmit+0x3a8/0xa40 [ 46.589639][ T7136] ip_queue_xmit+0x45/0x60 [ 46.594040][ T7136] __tcp_transmit_skb+0xe81/0x1d60 [ 46.599134][ T7136] __tcp_send_ack+0x246/0x300 [ 46.603789][ T7136] tcp_send_ack+0x34/0x40 [ 46.608097][ T7136] tcp_cleanup_rbuf+0x130/0x360 [ 46.612934][ T7136] tcp_recvmsg+0x633/0x1a30 [ 46.617508][ T7136] inet_recvmsg+0xbb/0x250 [ 46.621912][ T7136] ? __tsan_read8+0x2c/0x30 [ 46.626402][ T7136] ? inet_sendpage+0x100/0x100 [ 46.631143][ T7136] sock_recvmsg+0x92/0xb0 [ 46.635452][ T7136] sock_read_iter+0x15f/0x1e0 [ 46.640111][ T7136] new_sync_read+0x389/0x4f0 [ 46.644682][ T7136] __vfs_read+0xb1/0xc0 [ 46.648816][ T7136] vfs_read+0x143/0x2c0 [ 46.652950][ T7136] ksys_read+0xd5/0x1b0 [ 46.657086][ T7136] __x64_sys_read+0x4c/0x60 [ 46.661589][ T7136] do_syscall_64+0xcc/0x370 [ 46.666083][ T7136] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 46.671950][ T7136] RIP: 0033:0x47c530 [ 46.675930][ T7136] 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 [ 46.695518][ T7136] RSP: 002b:000000c4203af810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 46.703915][ T7136] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 46.711874][ T7136] RDX: 0000000000001000 RSI: 000000c4202d4000 RDI: 0000000000000003 [ 46.719827][ T7136] RBP: 000000c4203af868 R08: 0000000000000000 R09: 0000000000000000 [ 46.727775][ T7136] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000040 [ 46.735723][ T7136] R13: ffffffffffffffff R14: 0000000000000020 R15: ffffffffffffffff [ 46.744896][ T7136] Kernel Offset: disabled [ 46.749226][ T7136] Rebooting in 86400 seconds..