[ 35.093197][ T25] audit: type=1800 audit(1572279115.190:22): pid=7193 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0 [ 35.122607][ T25] audit: type=1800 audit(1572279115.190:23): pid=7193 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rsyslog" dev="sda1" ino=2475 res=0 [ 35.142943][ T25] audit: type=1800 audit(1572279115.190:24): pid=7193 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="sudo" dev="sda1" ino=2487 res=0 [....] Starting enhanced syslogd: rsyslogd[ 35.598521][ T7216] rsyslogd (7216) used greatest stack depth: 10136 bytes left [?25l[?1c7[ ok 8[?25h[?0c. [ 35.700612][ T25] audit: type=1800 audit(1572279115.840:25): pid=7193 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.737692][ T25] audit: type=1800 audit(1572279115.840:26): pid=7193 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.761028][ T25] audit: type=1800 audit(1572279115.840:27): pid=7193 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 '10.128.0.66' (ECDSA) to the list of known hosts. 2019/10/28 16:12:02 fuzzer started 2019/10/28 16:12:04 dialing manager at 10.128.0.105:45117 2019/10/28 16:12:04 syscalls: 2540 2019/10/28 16:12:04 code coverage: enabled 2019/10/28 16:12:04 comparison tracing: enabled 2019/10/28 16:12:04 extra coverage: extra coverage is not supported by the kernel 2019/10/28 16:12:04 setuid sandbox: enabled 2019/10/28 16:12:04 namespace sandbox: enabled 2019/10/28 16:12:04 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/28 16:12:04 fault injection: enabled 2019/10/28 16:12:04 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/28 16:12:04 net packet injection: enabled 2019/10/28 16:12:04 net device setup: enabled 2019/10/28 16:12:04 concurrency sanitizer: enabled 2019/10/28 16:12:07 adding functions to KCSAN blacklist: 'tick_sched_do_timer' 'blk_mq_sched_dispatch_requests' '__nf_conntrack_find_get' 'ep_poll' 'tomoyo_supervisor' '__hrtimer_run_queues' 'rcu_gp_fqs_loop' '__tcp_select_window' 'tcp_add_backlog' 'echo_char' 'pid_update_inode' syzkaller login: [ 47.855843][ T7369] ================================================================== [ 47.864125][ T7369] BUG: KCSAN: data-race in __nf_ct_refresh_acct / __nf_ct_refresh_acct [ 47.872364][ T7369] [ 47.874682][ T7369] read to 0xffff88812543b108 of 4 bytes by interrupt on cpu 0: [ 47.882299][ T7369] __nf_ct_refresh_acct+0xd4/0x1b0 [ 47.887403][ T7369] nf_conntrack_tcp_packet+0xd40/0x3390 [ 47.892925][ T7369] nf_conntrack_in+0x410/0xa80 [ 47.897663][ T7369] ipv4_conntrack_in+0x27/0x40 [ 47.902405][ T7369] nf_hook_slow+0x83/0x160 [ 47.906797][ T7369] ip_rcv+0x12f/0x1a0 [ 47.910849][ T7369] __netif_receive_skb_one_core+0xa7/0xe0 [ 47.916547][ T7369] __netif_receive_skb+0x37/0xf0 [ 47.921474][ T7369] netif_receive_skb_internal+0x59/0x190 [ 47.927083][ T7369] napi_gro_receive+0x28f/0x330 [ 47.931913][ T7369] receive_buf+0x284/0x30b0 [ 47.936390][ T7369] virtnet_poll+0x436/0x7d0 [ 47.940873][ T7369] net_rx_action+0x3ae/0xa90 [ 47.945447][ T7369] __do_softirq+0x115/0x33f [ 47.949927][ T7369] [ 47.952238][ T7369] write to 0xffff88812543b108 of 4 bytes by task 7369 on cpu 1: [ 47.960811][ T7369] __nf_ct_refresh_acct+0xfb/0x1b0 [ 47.965964][ T7369] nf_conntrack_tcp_packet+0xd40/0x3390 [ 47.971498][ T7369] nf_conntrack_in+0x410/0xa80 [ 47.976304][ T7369] ipv4_conntrack_local+0xbe/0x130 [ 47.981423][ T7369] nf_hook_slow+0x83/0x160 [ 47.985822][ T7369] __ip_local_out+0x1f7/0x2b0 [ 47.990490][ T7369] ip_local_out+0x31/0x90 [ 47.994837][ T7369] __ip_queue_xmit+0x3a8/0xa40 [ 47.999592][ T7369] ip_queue_xmit+0x45/0x60 [ 48.003988][ T7369] __tcp_transmit_skb+0xe81/0x1d60 [ 48.009085][ T7369] __tcp_send_ack+0x246/0x300 [ 48.013746][ T7369] tcp_send_ack+0x34/0x40 [ 48.018064][ T7369] tcp_cleanup_rbuf+0x130/0x360 [ 48.022887][ T7369] [ 48.025191][ T7369] Reported by Kernel Concurrency Sanitizer on: [ 48.031324][ T7369] CPU: 1 PID: 7369 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 48.038760][ T7369] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.048805][ T7369] ================================================================== [ 48.056854][ T7369] Kernel panic - not syncing: panic_on_warn set ... [ 48.063430][ T7369] CPU: 1 PID: 7369 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 48.070860][ T7369] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.080923][ T7369] Call Trace: [ 48.084571][ T7369] dump_stack+0xf5/0x159 [ 48.088797][ T7369] panic+0x210/0x640 [ 48.092673][ T7369] ? ip_queue_xmit+0x45/0x60 [ 48.097271][ T7369] ? vprintk_func+0x8d/0x140 [ 48.101857][ T7369] kcsan_report.cold+0xc/0x10 [ 48.106517][ T7369] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 48.112046][ T7369] __tsan_write4+0x32/0x40 [ 48.116444][ T7369] __nf_ct_refresh_acct+0xfb/0x1b0 [ 48.121537][ T7369] nf_conntrack_tcp_packet+0xd40/0x3390 [ 48.127083][ T7369] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 48.132696][ T7369] nf_conntrack_in+0x410/0xa80 [ 48.137456][ T7369] ipv4_conntrack_local+0xbe/0x130 [ 48.142553][ T7369] nf_hook_slow+0x83/0x160 [ 48.146945][ T7369] ? nf_ct_tcp_fixup+0xe0/0xe0 [ 48.151703][ T7369] __ip_local_out+0x1f7/0x2b0 [ 48.156359][ T7369] ? constant_test_bit+0x30/0x30 [ 48.161540][ T7369] ip_local_out+0x31/0x90 [ 48.165849][ T7369] __ip_queue_xmit+0x3a8/0xa40 [ 48.170599][ T7369] ip_queue_xmit+0x45/0x60 [ 48.174995][ T7369] __tcp_transmit_skb+0xe81/0x1d60 [ 48.180122][ T7369] __tcp_send_ack+0x246/0x300 [ 48.184782][ T7369] tcp_send_ack+0x34/0x40 [ 48.189098][ T7369] tcp_cleanup_rbuf+0x130/0x360 [ 48.194020][ T7369] tcp_recvmsg+0x633/0x1a30 [ 48.198538][ T7369] inet_recvmsg+0xbb/0x250 [ 48.203006][ T7369] ? __tsan_read8+0x2c/0x30 [ 48.207785][ T7369] ? inet_sendpage+0x100/0x100 [ 48.213078][ T7369] sock_recvmsg+0x92/0xb0 [ 48.217481][ T7369] sock_read_iter+0x15f/0x1e0 [ 48.222213][ T7369] new_sync_read+0x389/0x4f0 [ 48.226812][ T7369] __vfs_read+0xb1/0xc0 [ 48.231042][ T7369] vfs_read+0x143/0x2c0 [ 48.235369][ T7369] ksys_read+0xd5/0x1b0 [ 48.239509][ T7369] __x64_sys_read+0x4c/0x60 [ 48.244037][ T7369] do_syscall_64+0xcc/0x370 [ 48.248521][ T7369] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 48.254390][ T7369] RIP: 0033:0x47c530 [ 48.258276][ T7369] 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 [ 48.277875][ T7369] RSP: 002b:000000c4202e17d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 48.286370][ T7369] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 48.294337][ T7369] RDX: 0000000000001000 RSI: 000000c420360000 RDI: 0000000000000003 [ 48.302287][ T7369] RBP: 000000c4202e1830 R08: 0000000000000000 R09: 0000000000000000 [ 48.310244][ T7369] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000004 [ 48.318197][ T7369] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 48.327559][ T7369] Kernel Offset: disabled [ 48.332149][ T7369] Rebooting in 86400 seconds..