[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.711988][ T25] audit: type=1800 audit(1571773573.687:25): pid=7091 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.758110][ T25] audit: type=1800 audit(1571773573.687:26): pid=7091 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.779418][ T25] audit: type=1800 audit(1571773573.687:27): pid=7091 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 '10.128.0.75' (ECDSA) to the list of known hosts. 2019/10/22 19:46:21 fuzzer started 2019/10/22 19:46:22 dialing manager at 10.128.0.105:33369 2019/10/22 19:46:22 syscalls: 2524 2019/10/22 19:46:23 code coverage: enabled 2019/10/22 19:46:23 comparison tracing: enabled 2019/10/22 19:46:23 extra coverage: extra coverage is not supported by the kernel 2019/10/22 19:46:23 setuid sandbox: enabled 2019/10/22 19:46:23 namespace sandbox: enabled 2019/10/22 19:46:23 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 19:46:23 fault injection: enabled 2019/10/22 19:46:23 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 19:46:23 net packet injection: enabled 2019/10/22 19:46:23 net device setup: enabled 2019/10/22 19:46:23 concurrency sanitizer: enabled syzkaller login: [ 45.578472][ T7244] ================================================================== [ 45.586608][ T7244] BUG: KCSAN: data-race in __nf_conntrack_find_get / __nf_ct_refresh_acct [ 45.595098][ T7244] [ 45.597421][ T7244] read to 0xffff88812674e008 of 4 bytes by interrupt on cpu 1: [ 45.604973][ T7244] __nf_conntrack_find_get+0x284/0x880 [ 45.610450][ T7244] nf_conntrack_in+0x2ef/0xa80 [ 45.615227][ T7244] ipv4_conntrack_in+0x27/0x40 [ 45.619984][ T7244] nf_hook_slow+0x83/0x160 [ 45.624378][ T7244] ip_rcv+0x12f/0x1a0 [ 45.628341][ T7244] __netif_receive_skb_one_core+0xa7/0xe0 [ 45.634049][ T7244] __netif_receive_skb+0x37/0xf0 [ 45.638963][ T7244] netif_receive_skb_internal+0x59/0x190 [ 45.644581][ T7244] napi_gro_receive+0x28f/0x330 [ 45.649415][ T7244] receive_buf+0x284/0x30b0 [ 45.653936][ T7244] virtnet_poll+0x436/0x7d0 [ 45.658460][ T7244] net_rx_action+0x3ae/0xa90 [ 45.663035][ T7244] __do_softirq+0x115/0x33f [ 45.667536][ T7244] irq_exit+0xbb/0xe0 [ 45.671501][ T7244] [ 45.673828][ T7244] write to 0xffff88812674e008 of 4 bytes by task 7244 on cpu 0: [ 45.681443][ T7244] __nf_ct_refresh_acct+0xfb/0x1b0 [ 45.686657][ T7244] nf_conntrack_tcp_packet+0xd40/0x3390 [ 45.692200][ T7244] nf_conntrack_in+0x410/0xa80 [ 45.696944][ T7244] ipv4_conntrack_local+0xbe/0x130 [ 45.702040][ T7244] nf_hook_slow+0x83/0x160 [ 45.706444][ T7244] __ip_local_out+0x1f7/0x2b0 [ 45.711099][ T7244] ip_local_out+0x31/0x90 [ 45.715419][ T7244] __ip_queue_xmit+0x3a8/0xa40 [ 45.720173][ T7244] ip_queue_xmit+0x45/0x60 [ 45.724564][ T7244] __tcp_transmit_skb+0xe81/0x1d60 [ 45.729654][ T7244] __tcp_send_ack+0x246/0x300 [ 45.734306][ T7244] tcp_send_ack+0x34/0x40 [ 45.738707][ T7244] tcp_cleanup_rbuf+0x130/0x360 [ 45.743536][ T7244] [ 45.745837][ T7244] Reported by Kernel Concurrency Sanitizer on: [ 45.751979][ T7244] CPU: 0 PID: 7244 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 45.759421][ T7244] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.769452][ T7244] ================================================================== [ 45.777503][ T7244] Kernel panic - not syncing: panic_on_warn set ... [ 45.784067][ T7244] CPU: 0 PID: 7244 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 45.791494][ T7244] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.801532][ T7244] Call Trace: [ 45.804806][ T7244] dump_stack+0xf5/0x159 [ 45.809032][ T7244] panic+0x210/0x640 [ 45.812908][ T7244] ? ip_queue_xmit+0x45/0x60 [ 45.817487][ T7244] ? vprintk_func+0x8d/0x140 [ 45.822055][ T7244] kcsan_report.cold+0xc/0x10 [ 45.826735][ T7244] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 45.832268][ T7244] __tsan_write4+0x32/0x40 [ 45.836678][ T7244] __nf_ct_refresh_acct+0xfb/0x1b0 [ 45.841785][ T7244] nf_conntrack_tcp_packet+0xd40/0x3390 [ 45.847466][ T7244] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 45.853100][ T7244] nf_conntrack_in+0x410/0xa80 [ 45.857860][ T7244] ipv4_conntrack_local+0xbe/0x130 [ 45.862970][ T7244] nf_hook_slow+0x83/0x160 [ 45.867365][ T7244] ? nf_ct_tcp_fixup+0xe0/0xe0 [ 45.872112][ T7244] __ip_local_out+0x1f7/0x2b0 [ 45.876785][ T7244] ? constant_test_bit+0x30/0x30 [ 45.881701][ T7244] ip_local_out+0x31/0x90 [ 45.886023][ T7244] __ip_queue_xmit+0x3a8/0xa40 [ 45.890791][ T7244] ip_queue_xmit+0x45/0x60 [ 45.895196][ T7244] __tcp_transmit_skb+0xe81/0x1d60 [ 45.900290][ T7244] __tcp_send_ack+0x246/0x300 [ 45.904948][ T7244] tcp_send_ack+0x34/0x40 [ 45.909262][ T7244] tcp_cleanup_rbuf+0x130/0x360 [ 45.914093][ T7244] tcp_recvmsg+0x633/0x1a30 [ 45.918582][ T7244] inet_recvmsg+0xbb/0x250 [ 45.922984][ T7244] ? __tsan_read8+0x2c/0x30 [ 45.927566][ T7244] ? inet_sendpage+0x100/0x100 [ 45.932306][ T7244] sock_recvmsg+0x92/0xb0 [ 45.936613][ T7244] sock_read_iter+0x15f/0x1e0 [ 45.941285][ T7244] new_sync_read+0x389/0x4f0 [ 45.945869][ T7244] __vfs_read+0xb1/0xc0 [ 45.950022][ T7244] vfs_read+0x143/0x2c0 [ 45.954159][ T7244] ksys_read+0xd5/0x1b0 [ 45.958295][ T7244] __x64_sys_read+0x4c/0x60 [ 45.962790][ T7244] do_syscall_64+0xcc/0x370 [ 45.967273][ T7244] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 45.973155][ T7244] RIP: 0033:0x47c530 [ 45.977030][ T7244] 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 [ 45.996622][ T7244] RSP: 002b:000000c4202d37d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 46.005110][ T7244] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 46.013061][ T7244] RDX: 0000000000001000 RSI: 000000c42015c000 RDI: 0000000000000003 [ 46.021104][ T7244] RBP: 000000c4202d3830 R08: 0000000000000000 R09: 0000000000000000 [ 46.029093][ T7244] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000004 [ 46.037073][ T7244] R13: 000000c4202500b0 R14: 0000000000000002 R15: ffffffffffffffff [ 46.046387][ T7244] Kernel Offset: disabled [ 46.050722][ T7244] Rebooting in 86400 seconds..