[info] Using makefile-style concurrent boot in runlevel 2. [ 45.898943][ T26] audit: type=1800 audit(1570192076.840:21): pid=7107 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 45.945687][ T26] audit: type=1800 audit(1570192076.840:22): pid=7107 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] 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 '10.128.0.44' (ECDSA) to the list of known hosts. 2019/10/04 12:28:05 fuzzer started 2019/10/04 12:28:07 dialing manager at 10.128.0.105:38119 2019/10/04 12:28:07 syscalls: 2523 2019/10/04 12:28:07 code coverage: enabled 2019/10/04 12:28:07 comparison tracing: enabled 2019/10/04 12:28:07 extra coverage: extra coverage is not supported by the kernel 2019/10/04 12:28:07 setuid sandbox: enabled 2019/10/04 12:28:07 namespace sandbox: enabled 2019/10/04 12:28:07 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/04 12:28:07 fault injection: enabled 2019/10/04 12:28:07 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/04 12:28:07 net packet injection: enabled 2019/10/04 12:28:07 net device setup: enabled 2019/10/04 12:28:07 concurrency sanitizer: enabled syzkaller login: [ 56.785597][ T7258] ================================================================== [ 56.794087][ T7258] BUG: KCSAN: data-race in tcp_poll+0x204/0x6b0 and tcp_queue_rcv+0xe9/0x380 [ 56.802852][ T7258] [ 56.805184][ T7258] write to 0xffff8881264c0e70 of 4 bytes by interrupt on cpu 1: [ 56.812802][ T7258] tcp_queue_rcv+0xe9/0x380 [ 56.817359][ T7258] tcp_rcv_established+0xbf1/0xf50 [ 56.822463][ T7258] tcp_v4_do_rcv+0x381/0x4e0 [ 56.827033][ T7258] tcp_v4_rcv+0x1a03/0x1bf0 [ 56.831558][ T7258] ip_protocol_deliver_rcu+0x51/0x470 [ 56.836918][ T7258] ip_local_deliver_finish+0x110/0x140 [ 56.842373][ T7258] ip_local_deliver+0x133/0x210 [ 56.847327][ T7258] ip_rcv_finish+0x121/0x160 [ 56.851922][ T7258] ip_rcv+0x18f/0x1a0 [ 56.855938][ T7258] __netif_receive_skb_one_core+0xa7/0xe0 [ 56.861635][ T7258] __netif_receive_skb+0x37/0xf0 [ 56.866555][ T7258] netif_receive_skb_internal+0x59/0x190 [ 56.872274][ T7258] napi_gro_receive+0x28f/0x330 [ 56.877108][ T7258] receive_buf+0x284/0x30b0 [ 56.881608][ T7258] [ 56.883949][ T7258] read to 0xffff8881264c0e70 of 4 bytes by task 7258 on cpu 0: [ 56.891589][ T7258] tcp_poll+0x204/0x6b0 [ 56.895744][ T7258] sock_poll+0xed/0x250 [ 56.899901][ T7258] ep_item_poll.isra.0+0x90/0x190 [ 56.904915][ T7258] ep_send_events_proc+0x113/0x5c0 [ 56.910020][ T7258] ep_scan_ready_list.constprop.0+0x189/0x500 [ 56.916080][ T7258] ep_poll+0xe3/0x900 [ 56.920040][ T7258] do_epoll_wait+0x162/0x180 [ 56.924625][ T7258] __x64_sys_epoll_pwait+0xcd/0x170 [ 56.929814][ T7258] do_syscall_64+0xcf/0x2f0 [ 56.934350][ T7258] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 56.940216][ T7258] [ 56.942520][ T7258] Reported by Kernel Concurrency Sanitizer on: [ 56.948656][ T7258] CPU: 0 PID: 7258 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 56.955751][ T7258] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.965798][ T7258] ================================================================== [ 56.973843][ T7258] Kernel panic - not syncing: panic_on_warn set ... [ 56.980427][ T7258] CPU: 0 PID: 7258 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 56.987507][ T7258] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.997623][ T7258] Call Trace: [ 57.000905][ T7258] dump_stack+0xf5/0x159 [ 57.005144][ T7258] panic+0x209/0x639 [ 57.009022][ T7258] ? vprintk_func+0x8d/0x140 [ 57.013612][ T7258] kcsan_report.cold+0x57/0xeb [ 57.018371][ T7258] __kcsan_setup_watchpoint+0x342/0x500 [ 57.023909][ T7258] __tsan_read4+0x2c/0x30 [ 57.028221][ T7258] tcp_poll+0x204/0x6b0 [ 57.032372][ T7258] ? tcp_alloc_md5sig_pool+0x320/0x320 [ 57.037829][ T7258] sock_poll+0xed/0x250 [ 57.041968][ T7258] ? sock_read_iter+0x1e0/0x1e0 [ 57.046821][ T7258] ep_item_poll.isra.0+0x90/0x190 [ 57.051837][ T7258] ep_send_events_proc+0x113/0x5c0 [ 57.056951][ T7258] ep_scan_ready_list.constprop.0+0x189/0x500 [ 57.063000][ T7258] ? ep_loop_check_proc+0x2f0/0x2f0 [ 57.068190][ T7258] ep_poll+0xe3/0x900 [ 57.072155][ T7258] ? wake_up_q+0x70/0x70 [ 57.076377][ T7258] do_epoll_wait+0x162/0x180 [ 57.081010][ T7258] __x64_sys_epoll_pwait+0xcd/0x170 [ 57.086224][ T7258] do_syscall_64+0xcf/0x2f0 [ 57.090717][ T7258] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 57.096599][ T7258] RIP: 0033:0x45b300 [ 57.100476][ T7258] Code: 0f 05 89 44 24 20 c3 cc cc cc 8b 7c 24 08 48 8b 74 24 10 8b 54 24 18 44 8b 54 24 1c 49 c7 c0 00 00 00 00 b8 19 01 00 00 0f 05 <89> 44 24 20 c3 cc cc cc cc cc cc cc cc cc cc cc 8b 7c 24 08 48 c7 [ 57.121091][ T7258] RSP: 002b:000000c420149860 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 57.129944][ T7258] RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 000000000045b300 [ 57.137921][ T7258] RDX: 0000000000000080 RSI: 000000c4201498a0 RDI: 0000000000000004 [ 57.145877][ T7258] RBP: 000000c420149ea0 R08: 0000000000000000 R09: 0000000000000000 [ 57.153828][ T7258] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000100 [ 57.161797][ T7258] R13: ffffffffffffffff R14: 0000000000000004 R15: ffffffffffffffff [ 57.171298][ T7258] Kernel Offset: disabled [ 57.175635][ T7258] Rebooting in 86400 seconds..