[ 42.941879][ T25] audit: type=1800 audit(1571678268.551:23): pid=7085 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rsyslog" dev="sda1" ino=2475 res=0 [ 42.965080][ T25] audit: type=1800 audit(1571678268.551:24): pid=7085 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[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [ 43.511552][ T7150] sshd (7150) used greatest stack depth: 10136 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.1.7' (ECDSA) to the list of known hosts. 2019/10/21 17:17:57 fuzzer started 2019/10/21 17:17:58 dialing manager at 10.128.0.105:39747 2019/10/21 17:17:58 syscalls: 2524 2019/10/21 17:17:58 code coverage: enabled 2019/10/21 17:17:58 comparison tracing: enabled 2019/10/21 17:17:58 extra coverage: extra coverage is not supported by the kernel 2019/10/21 17:17:58 setuid sandbox: enabled 2019/10/21 17:17:58 namespace sandbox: enabled 2019/10/21 17:17:58 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/21 17:17:58 fault injection: enabled 2019/10/21 17:17:58 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/21 17:17:58 net packet injection: enabled 2019/10/21 17:17:58 net device setup: enabled 2019/10/21 17:17:58 concurrency sanitizer: enabled syzkaller login: [ 53.443323][ T7240] ================================================================== [ 53.451460][ T7240] BUG: KCSAN: data-race in __nf_ct_refresh_acct / __nf_ct_refresh_acct [ 53.459689][ T7240] [ 53.462018][ T7240] read to 0xffff888121802b08 of 4 bytes by interrupt on cpu 0: [ 53.469557][ T7240] __nf_ct_refresh_acct+0xd4/0x1b0 [ 53.474656][ T7240] nf_conntrack_tcp_packet+0xd40/0x3390 [ 53.480179][ T7240] nf_conntrack_in+0x410/0xa80 [ 53.484916][ T7240] ipv4_conntrack_in+0x27/0x40 [ 53.489664][ T7240] nf_hook_slow+0x83/0x160 [ 53.494058][ T7240] ip_rcv+0x12f/0x1a0 [ 53.498018][ T7240] __netif_receive_skb_one_core+0xa7/0xe0 [ 53.503713][ T7240] __netif_receive_skb+0x37/0xf0 [ 53.508895][ T7240] netif_receive_skb_internal+0x59/0x190 [ 53.514528][ T7240] napi_gro_receive+0x28f/0x330 [ 53.519366][ T7240] receive_buf+0x284/0x30b0 [ 53.523858][ T7240] virtnet_poll+0x436/0x7d0 [ 53.528347][ T7240] net_rx_action+0x3ae/0xa90 [ 53.532923][ T7240] __do_softirq+0x115/0x33f [ 53.537399][ T7240] [ 53.539718][ T7240] write to 0xffff888121802b08 of 4 bytes by task 7240 on cpu 1: [ 53.547323][ T7240] __nf_ct_refresh_acct+0xfb/0x1b0 [ 53.552460][ T7240] nf_conntrack_tcp_packet+0xd40/0x3390 [ 53.557984][ T7240] nf_conntrack_in+0x410/0xa80 [ 53.562727][ T7240] ipv4_conntrack_local+0xbe/0x130 [ 53.567825][ T7240] nf_hook_slow+0x83/0x160 [ 53.572221][ T7240] __ip_local_out+0x1f7/0x2b0 [ 53.576870][ T7240] ip_local_out+0x31/0x90 [ 53.581173][ T7240] __ip_queue_xmit+0x3a8/0xa40 [ 53.585920][ T7240] ip_queue_xmit+0x45/0x60 [ 53.590320][ T7240] __tcp_transmit_skb+0xe81/0x1d60 [ 53.595406][ T7240] __tcp_send_ack+0x246/0x300 [ 53.600060][ T7240] tcp_send_ack+0x34/0x40 [ 53.604367][ T7240] tcp_cleanup_rbuf+0x130/0x360 [ 53.609189][ T7240] [ 53.611507][ T7240] Reported by Kernel Concurrency Sanitizer on: [ 53.617919][ T7240] CPU: 1 PID: 7240 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 53.625347][ T7240] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.635376][ T7240] ================================================================== [ 53.643421][ T7240] Kernel panic - not syncing: panic_on_warn set ... [ 53.650013][ T7240] CPU: 1 PID: 7240 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 53.657961][ T7240] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.668597][ T7240] Call Trace: [ 53.671880][ T7240] dump_stack+0xf5/0x159 [ 53.676106][ T7240] panic+0x210/0x640 [ 53.679980][ T7240] ? ip_queue_xmit+0x45/0x60 [ 53.684548][ T7240] ? vprintk_func+0x8d/0x140 [ 53.689118][ T7240] kcsan_report.cold+0xc/0x10 [ 53.693773][ T7240] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 53.699299][ T7240] __tsan_write4+0x32/0x40 [ 53.704046][ T7240] __nf_ct_refresh_acct+0xfb/0x1b0 [ 53.709134][ T7240] nf_conntrack_tcp_packet+0xd40/0x3390 [ 53.714662][ T7240] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 53.720275][ T7240] nf_conntrack_in+0x410/0xa80 [ 53.725017][ T7240] ipv4_conntrack_local+0xbe/0x130 [ 53.730105][ T7240] nf_hook_slow+0x83/0x160 [ 53.734498][ T7240] ? nf_ct_tcp_fixup+0xe0/0xe0 [ 53.739239][ T7240] __ip_local_out+0x1f7/0x2b0 [ 53.743905][ T7240] ? constant_test_bit+0x30/0x30 [ 53.748821][ T7240] ip_local_out+0x31/0x90 [ 53.753130][ T7240] __ip_queue_xmit+0x3a8/0xa40 [ 53.758053][ T7240] ip_queue_xmit+0x45/0x60 [ 53.762450][ T7240] __tcp_transmit_skb+0xe81/0x1d60 [ 53.767559][ T7240] __tcp_send_ack+0x246/0x300 [ 53.772652][ T7240] tcp_send_ack+0x34/0x40 [ 53.776972][ T7240] tcp_cleanup_rbuf+0x130/0x360 [ 53.781804][ T7240] tcp_recvmsg+0x633/0x1a30 [ 53.786296][ T7240] inet_recvmsg+0xbb/0x250 [ 53.792609][ T7240] ? __tsan_read8+0x2c/0x30 [ 53.797107][ T7240] ? inet_sendpage+0x100/0x100 [ 53.801851][ T7240] sock_recvmsg+0x92/0xb0 [ 53.806169][ T7240] sock_read_iter+0x15f/0x1e0 [ 53.810827][ T7240] new_sync_read+0x389/0x4f0 [ 53.815398][ T7240] __vfs_read+0xb1/0xc0 [ 53.819531][ T7240] vfs_read+0x143/0x2c0 [ 53.823680][ T7240] ksys_read+0xd5/0x1b0 [ 53.827810][ T7240] __x64_sys_read+0x4c/0x60 [ 53.833769][ T7240] do_syscall_64+0xcc/0x370 [ 53.838251][ T7240] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 53.844116][ T7240] RIP: 0033:0x47c530 [ 53.847987][ T7240] 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 [ 53.867564][ T7240] RSP: 002b:000000c4203ad810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 53.875948][ T7240] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 53.883895][ T7240] RDX: 0000000000001000 RSI: 000000c420390000 RDI: 0000000000000003 [ 53.892012][ T7240] RBP: 000000c4203ad868 R08: 0000000000000000 R09: 0000000000000000 [ 53.899959][ T7240] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000002 [ 53.907905][ T7240] R13: ffffffffffffffff R14: 0000000000000004 R15: ffffffffffffffff [ 53.917206][ T7240] Kernel Offset: disabled [ 53.921528][ T7240] Rebooting in 86400 seconds..