[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 33.775443][ T23] audit: type=1800 audit(1571783651.947:25): pid=7008 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 33.802938][ T23] audit: type=1800 audit(1571783651.947:26): pid=7008 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 33.830292][ T23] audit: type=1800 audit(1571783651.947:27): pid=7008 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 '10.128.0.103' (ECDSA) to the list of known hosts. 2019/10/22 22:34:21 fuzzer started 2019/10/22 22:34:22 dialing manager at 10.128.0.105:33369 2019/10/22 22:34:22 syscalls: 2524 2019/10/22 22:34:22 code coverage: enabled 2019/10/22 22:34:22 comparison tracing: enabled 2019/10/22 22:34:22 extra coverage: extra coverage is not supported by the kernel 2019/10/22 22:34:22 setuid sandbox: enabled 2019/10/22 22:34:22 namespace sandbox: enabled 2019/10/22 22:34:22 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 22:34:22 fault injection: enabled 2019/10/22 22:34:22 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 22:34:22 net packet injection: enabled 2019/10/22 22:34:22 net device setup: enabled 2019/10/22 22:34:22 concurrency sanitizer: enabled syzkaller login: [ 45.651663][ T7160] ================================================================== [ 45.659801][ T7160] BUG: KCSAN: data-race in __nf_ct_refresh_acct / __nf_ct_refresh_acct [ 45.668043][ T7160] [ 45.670377][ T7160] read to 0xffff888122ab2108 of 4 bytes by interrupt on cpu 1: [ 45.677915][ T7160] __nf_ct_refresh_acct+0xd4/0x1b0 [ 45.683020][ T7160] nf_conntrack_tcp_packet+0xd40/0x3390 [ 45.688559][ T7160] nf_conntrack_in+0x410/0xa80 [ 45.693293][ T7160] ipv4_conntrack_in+0x27/0x40 [ 45.698042][ T7160] nf_hook_slow+0x83/0x160 [ 45.702431][ T7160] ip_rcv+0x12f/0x1a0 [ 45.706478][ T7160] __netif_receive_skb_one_core+0xa7/0xe0 [ 45.712181][ T7160] __netif_receive_skb+0x37/0xf0 [ 45.717152][ T7160] netif_receive_skb_internal+0x59/0x190 [ 45.722762][ T7160] napi_gro_receive+0x28f/0x330 [ 45.727592][ T7160] receive_buf+0x284/0x30b0 [ 45.732081][ T7160] virtnet_poll+0x436/0x7d0 [ 45.736613][ T7160] net_rx_action+0x3ae/0xa90 [ 45.741182][ T7160] __do_softirq+0x115/0x33f [ 45.745806][ T7160] [ 45.748118][ T7160] write to 0xffff888122ab2108 of 4 bytes by task 7160 on cpu 0: [ 45.755724][ T7160] __nf_ct_refresh_acct+0xfb/0x1b0 [ 45.760865][ T7160] nf_conntrack_tcp_packet+0xd40/0x3390 [ 45.766425][ T7160] nf_conntrack_in+0x410/0xa80 [ 45.771177][ T7160] ipv4_conntrack_local+0xbe/0x130 [ 45.776278][ T7160] nf_hook_slow+0x83/0x160 [ 45.782319][ T7160] __ip_local_out+0x1f7/0x2b0 [ 45.786969][ T7160] ip_local_out+0x31/0x90 [ 45.791286][ T7160] __ip_queue_xmit+0x3a8/0xa40 [ 45.796045][ T7160] ip_queue_xmit+0x45/0x60 [ 45.800439][ T7160] __tcp_transmit_skb+0xe81/0x1d60 [ 45.805525][ T7160] __tcp_send_ack+0x246/0x300 [ 45.810192][ T7160] tcp_send_ack+0x34/0x40 [ 45.814511][ T7160] tcp_cleanup_rbuf+0x130/0x360 [ 45.819330][ T7160] [ 45.821631][ T7160] Reported by Kernel Concurrency Sanitizer on: [ 45.827758][ T7160] CPU: 0 PID: 7160 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 45.835196][ T7160] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.845225][ T7160] ================================================================== [ 45.853258][ T7160] Kernel panic - not syncing: panic_on_warn set ... [ 45.859820][ T7160] CPU: 0 PID: 7160 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 45.867249][ T7160] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.877297][ T7160] Call Trace: [ 45.880581][ T7160] dump_stack+0xf5/0x159 [ 45.884823][ T7160] panic+0x210/0x640 [ 45.888699][ T7160] ? ip_queue_xmit+0x45/0x60 [ 45.893264][ T7160] ? vprintk_func+0x8d/0x140 [ 45.897837][ T7160] kcsan_report.cold+0xc/0x10 [ 45.902494][ T7160] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 45.908016][ T7160] __tsan_write4+0x32/0x40 [ 45.912414][ T7160] __nf_ct_refresh_acct+0xfb/0x1b0 [ 45.917504][ T7160] nf_conntrack_tcp_packet+0xd40/0x3390 [ 45.923033][ T7160] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 45.928696][ T7160] nf_conntrack_in+0x410/0xa80 [ 45.933527][ T7160] ipv4_conntrack_local+0xbe/0x130 [ 45.938617][ T7160] nf_hook_slow+0x83/0x160 [ 45.943013][ T7160] ? nf_ct_tcp_fixup+0xe0/0xe0 [ 45.947754][ T7160] __ip_local_out+0x1f7/0x2b0 [ 45.952409][ T7160] ? constant_test_bit+0x30/0x30 [ 45.957324][ T7160] ip_local_out+0x31/0x90 [ 45.961645][ T7160] __ip_queue_xmit+0x3a8/0xa40 [ 45.967432][ T7160] ip_queue_xmit+0x45/0x60 [ 45.971916][ T7160] __tcp_transmit_skb+0xe81/0x1d60 [ 45.977011][ T7160] __tcp_send_ack+0x246/0x300 [ 45.981670][ T7160] tcp_send_ack+0x34/0x40 [ 45.985992][ T7160] tcp_cleanup_rbuf+0x130/0x360 [ 45.990835][ T7160] tcp_recvmsg+0x633/0x1a30 [ 45.995324][ T7160] inet_recvmsg+0xbb/0x250 [ 45.999716][ T7160] ? __tsan_read8+0x2c/0x30 [ 46.004197][ T7160] ? inet_sendpage+0x100/0x100 [ 46.009481][ T7160] sock_recvmsg+0x92/0xb0 [ 46.013791][ T7160] sock_read_iter+0x15f/0x1e0 [ 46.018536][ T7160] new_sync_read+0x389/0x4f0 [ 46.023109][ T7160] __vfs_read+0xb1/0xc0 [ 46.027241][ T7160] vfs_read+0x143/0x2c0 [ 46.031388][ T7160] ksys_read+0xd5/0x1b0 [ 46.035527][ T7160] __x64_sys_read+0x4c/0x60 [ 46.040023][ T7160] do_syscall_64+0xcc/0x370 [ 46.044507][ T7160] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 46.050376][ T7160] RIP: 0033:0x47c530 [ 46.054250][ T7160] 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 [ 46.073841][ T7160] RSP: 002b:000000c42034d810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 46.082239][ T7160] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 46.090316][ T7160] RDX: 0000000000001000 RSI: 000000c4202ee000 RDI: 0000000000000003 [ 46.098377][ T7160] RBP: 000000c42034d868 R08: 0000000000000000 R09: 0000000000000000 [ 46.106370][ T7160] R10: 0000000000000000 R11: 0000000000000202 R12: 000000c420335e98 [ 46.114341][ T7160] R13: 000000000000000f R14: 0000000000c14060 R15: 0000000000000241 [ 46.123645][ T7160] Kernel Offset: disabled [ 46.127966][ T7160] Rebooting in 86400 seconds..