[info] Using makefile-style concurrent boot in runlevel 2. [ 43.931056][ T26] audit: type=1800 audit(1571774580.932:21): pid=7067 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 43.959598][ T26] audit: type=1800 audit(1571774580.932:22): pid=7067 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 '10.128.1.11' (ECDSA) to the list of known hosts. 2019/10/22 20:03:11 fuzzer started 2019/10/22 20:03:13 dialing manager at 10.128.0.105:33369 2019/10/22 20:03:13 syscalls: 2524 2019/10/22 20:03:13 code coverage: enabled 2019/10/22 20:03:13 comparison tracing: enabled 2019/10/22 20:03:13 extra coverage: extra coverage is not supported by the kernel 2019/10/22 20:03:13 setuid sandbox: enabled 2019/10/22 20:03:13 namespace sandbox: enabled 2019/10/22 20:03:13 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 20:03:13 fault injection: enabled 2019/10/22 20:03:13 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 20:03:13 net packet injection: enabled 2019/10/22 20:03:13 net device setup: enabled 2019/10/22 20:03:13 concurrency sanitizer: enabled syzkaller login: [ 56.543062][ T7231] ================================================================== [ 56.551204][ T7231] BUG: KCSAN: data-race in tcp_poll / tcp_queue_rcv [ 56.557791][ T7231] [ 56.560122][ T7231] write to 0xffff88811a9c1778 of 4 bytes by interrupt on cpu 1: [ 56.567746][ T7231] tcp_queue_rcv+0x180/0x380 [ 56.572334][ T7231] tcp_rcv_established+0xbf1/0xf50 [ 56.577439][ T7231] tcp_v4_do_rcv+0x381/0x4e0 [ 56.582016][ T7231] tcp_v4_rcv+0x19dc/0x1bb0 [ 56.586506][ T7231] ip_protocol_deliver_rcu+0x4d/0x420 [ 56.591865][ T7231] ip_local_deliver_finish+0x110/0x140 [ 56.597315][ T7231] ip_local_deliver+0x133/0x210 [ 56.602143][ T7231] ip_rcv_finish+0x121/0x160 [ 56.606814][ T7231] ip_rcv+0x18f/0x1a0 [ 56.610774][ T7231] __netif_receive_skb_one_core+0xa7/0xe0 [ 56.616466][ T7231] __netif_receive_skb+0x37/0xf0 [ 56.621377][ T7231] netif_receive_skb_internal+0x59/0x190 [ 56.627023][ T7231] napi_gro_receive+0x28f/0x330 [ 56.631848][ T7231] receive_buf+0x284/0x30b0 [ 56.636322][ T7231] [ 56.638628][ T7231] read to 0xffff88811a9c1778 of 4 bytes by task 7231 on cpu 0: [ 56.646253][ T7231] tcp_poll+0x204/0x6b0 [ 56.650410][ T7231] sock_poll+0xed/0x250 [ 56.654549][ T7231] ep_item_poll.isra.0+0x90/0x190 [ 56.659554][ T7231] ep_send_events_proc+0x113/0x590 [ 56.664656][ T7231] ep_scan_ready_list.constprop.0+0x189/0x500 [ 56.670713][ T7231] ep_poll+0xe3/0x900 [ 56.674675][ T7231] do_epoll_wait+0x162/0x180 [ 56.679243][ T7231] __x64_sys_epoll_pwait+0xcd/0x180 [ 56.684421][ T7231] do_syscall_64+0xcc/0x370 [ 56.688903][ T7231] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 56.694774][ T7231] [ 56.697087][ T7231] Reported by Kernel Concurrency Sanitizer on: [ 56.703257][ T7231] CPU: 0 PID: 7231 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 56.710689][ T7231] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.720716][ T7231] ================================================================== [ 56.728760][ T7231] Kernel panic - not syncing: panic_on_warn set ... [ 56.735322][ T7231] CPU: 0 PID: 7231 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 56.742902][ T7231] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.753237][ T7231] Call Trace: [ 56.756520][ T7231] dump_stack+0xf5/0x159 [ 56.760785][ T7231] panic+0x210/0x640 [ 56.765008][ T7231] ? do_syscall_64+0xcc/0x370 [ 56.769661][ T7231] ? vprintk_func+0x8d/0x140 [ 56.774230][ T7231] kcsan_report.cold+0xc/0x10 [ 56.778896][ T7231] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 56.784419][ T7231] ? tcp_recvmsg+0x65b/0x1a30 [ 56.789072][ T7231] __tsan_read4+0x2c/0x30 [ 56.793390][ T7231] tcp_poll+0x204/0x6b0 [ 56.797528][ T7231] ? tcp_alloc_md5sig_pool+0x320/0x320 [ 56.804529][ T7231] sock_poll+0xed/0x250 [ 56.808663][ T7231] ? sock_read_iter+0x1e0/0x1e0 [ 56.813496][ T7231] ep_item_poll.isra.0+0x90/0x190 [ 56.818507][ T7231] ep_send_events_proc+0x113/0x590 [ 56.823603][ T7231] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 56.829218][ T7231] ep_scan_ready_list.constprop.0+0x189/0x500 [ 56.835261][ T7231] ? ep_loop_check_proc+0x2f0/0x2f0 [ 56.840445][ T7231] ep_poll+0xe3/0x900 [ 56.844406][ T7231] ? __fget+0xb8/0x1d0 [ 56.848663][ T7231] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 56.854271][ T7231] ? __fget_light+0xaf/0x190 [ 56.858846][ T7231] do_epoll_wait+0x162/0x180 [ 56.863592][ T7231] __x64_sys_epoll_pwait+0xcd/0x180 [ 56.869309][ T7231] do_syscall_64+0xcc/0x370 [ 56.873791][ T7231] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 56.879668][ T7231] RIP: 0033:0x45b300 [ 56.883542][ T7231] 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 [ 56.903131][ T7231] RSP: 002b:000000c4202f9860 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 56.911521][ T7231] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045b300 [ 56.919476][ T7231] RDX: 0000000000000080 RSI: 000000c4202f98a0 RDI: 0000000000000004 [ 56.927432][ T7231] RBP: 000000c4202f9ea0 R08: 0000000000000000 R09: 0000000000000000 [ 56.935383][ T7231] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008 [ 56.943353][ T7231] R13: ffffffffffffffff R14: 0000000000000004 R15: ffffffffffffffff [ 56.952947][ T7231] Kernel Offset: disabled [ 56.957266][ T7231] Rebooting in 86400 seconds..