[info] Using makefile-style concurrent boot in runlevel 2. [ 44.065458][ T26] audit: type=1800 audit(1574418302.523:21): pid=7493 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 44.095723][ T26] audit: type=1800 audit(1574418302.523:22): pid=7493 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. 2019/11/22 10:25:14 fuzzer started 2019/11/22 10:25:15 dialing manager at 10.128.0.105:37257 2019/11/22 10:25:16 syscalls: 2566 2019/11/22 10:25:16 code coverage: enabled 2019/11/22 10:25:16 comparison tracing: enabled 2019/11/22 10:25:16 extra coverage: extra coverage is not supported by the kernel 2019/11/22 10:25:16 setuid sandbox: enabled 2019/11/22 10:25:16 namespace sandbox: enabled 2019/11/22 10:25:16 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/22 10:25:16 fault injection: enabled 2019/11/22 10:25:16 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/22 10:25:16 net packet injection: enabled 2019/11/22 10:25:16 net device setup: enabled 2019/11/22 10:25:16 concurrency sanitizer: enabled 2019/11/22 10:25:16 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/11/22 10:25:16 adding functions to KCSAN blacklist: 'vm_area_dup' 'tomoyo_supervisor' '__hrtimer_run_queues' 'run_timer_softirq' 'find_next_bit' syzkaller login: [ 58.544246][ T7646] ================================================================== [ 58.552388][ T7646] BUG: KCSAN: data-race in tcp_add_backlog / tcp_recvmsg [ 58.559381][ T7646] [ 58.561693][ T7646] write to 0xffff8881229b69f8 of 8 bytes by interrupt on cpu 0: [ 58.569302][ T7646] tcp_add_backlog+0x476/0xce0 [ 58.574045][ T7646] tcp_v4_rcv+0x1a70/0x1bd0 [ 58.578529][ T7646] ip_protocol_deliver_rcu+0x4d/0x420 [ 58.583880][ T7646] ip_local_deliver_finish+0x110/0x140 [ 58.589338][ T7646] ip_local_deliver+0x133/0x210 [ 58.594168][ T7646] ip_rcv_finish+0x121/0x160 [ 58.598738][ T7646] ip_rcv+0x18f/0x1a0 [ 58.602701][ T7646] __netif_receive_skb_one_core+0xa7/0xe0 [ 58.608398][ T7646] __netif_receive_skb+0x37/0xf0 [ 58.613313][ T7646] netif_receive_skb_internal+0x59/0x190 [ 58.618921][ T7646] napi_gro_receive+0x28f/0x330 [ 58.623792][ T7646] receive_buf+0x284/0x30b0 [ 58.628294][ T7646] virtnet_poll+0x436/0x7d0 [ 58.632776][ T7646] net_rx_action+0x3ae/0xa90 [ 58.637344][ T7646] __do_softirq+0x115/0x33f [ 58.641826][ T7646] run_ksoftirqd+0x46/0x60 [ 58.646222][ T7646] smpboot_thread_fn+0x37d/0x4a0 [ 58.651137][ T7646] kthread+0x1d4/0x200 [ 58.655201][ T7646] ret_from_fork+0x1f/0x30 [ 58.659587][ T7646] [ 58.661898][ T7646] read to 0xffff8881229b69f8 of 8 bytes by task 7646 on cpu 1: [ 58.669419][ T7646] tcp_recvmsg+0x46e/0x1b40 [ 58.673905][ T7646] inet_recvmsg+0xbb/0x250 [ 58.678299][ T7646] sock_recvmsg+0x92/0xb0 [ 58.682609][ T7646] sock_read_iter+0x15f/0x1e0 [ 58.687267][ T7646] new_sync_read+0x389/0x4f0 [ 58.691835][ T7646] __vfs_read+0xb1/0xc0 [ 58.695967][ T7646] vfs_read+0x143/0x2c0 [ 58.700096][ T7646] ksys_read+0xd5/0x1b0 [ 58.704230][ T7646] __x64_sys_read+0x4c/0x60 [ 58.708729][ T7646] do_syscall_64+0xcc/0x370 [ 58.713210][ T7646] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 58.719074][ T7646] [ 58.721379][ T7646] Reported by Kernel Concurrency Sanitizer on: [ 58.727526][ T7646] CPU: 1 PID: 7646 Comm: syz-fuzzer Not tainted 5.4.0-rc7+ #0 [ 58.734972][ T7646] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.745008][ T7646] ================================================================== [ 58.753054][ T7646] Kernel panic - not syncing: panic_on_warn set ... [ 58.759632][ T7646] CPU: 1 PID: 7646 Comm: syz-fuzzer Not tainted 5.4.0-rc7+ #0 [ 58.767067][ T7646] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.777115][ T7646] Call Trace: [ 58.780392][ T7646] dump_stack+0x11d/0x181 [ 58.784709][ T7646] panic+0x210/0x640 [ 58.788586][ T7646] ? vprintk_func+0x8d/0x140 [ 58.793160][ T7646] kcsan_report.cold+0xc/0xd [ 58.797737][ T7646] kcsan_setup_watchpoint+0x3fe/0x460 [ 58.803101][ T7646] __tsan_read8+0xc6/0x100 [ 58.807501][ T7646] tcp_recvmsg+0x46e/0x1b40 [ 58.812006][ T7646] inet_recvmsg+0xbb/0x250 [ 58.816405][ T7646] ? apparmor_socket_recvmsg+0x3b/0x50 [ 58.821866][ T7646] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 58.828095][ T7646] ? security_socket_recvmsg+0x92/0xb0 [ 58.833543][ T7646] ? inet_sendpage+0x100/0x100 [ 58.838295][ T7646] sock_recvmsg+0x92/0xb0 [ 58.842615][ T7646] sock_read_iter+0x15f/0x1e0 [ 58.847276][ T7646] new_sync_read+0x389/0x4f0 [ 58.851852][ T7646] __vfs_read+0xb1/0xc0 [ 58.855994][ T7646] vfs_read+0x143/0x2c0 [ 58.860131][ T7646] ksys_read+0xd5/0x1b0 [ 58.864267][ T7646] __x64_sys_read+0x4c/0x60 [ 58.868754][ T7646] do_syscall_64+0xcc/0x370 [ 58.873241][ T7646] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 58.879120][ T7646] RIP: 0033:0x47c530 [ 58.883006][ T7646] 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 [ 58.905375][ T7646] RSP: 002b:000000c4203a17d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 58.913769][ T7646] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 58.921721][ T7646] RDX: 0000000000001000 RSI: 000000c42024e000 RDI: 0000000000000003 [ 58.929699][ T7646] RBP: 000000c4203a1830 R08: 0000000000000000 R09: 0000000000000000 [ 58.937651][ T7646] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000010 [ 58.945604][ T7646] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 58.954878][ T7646] Kernel Offset: disabled [ 58.959198][ T7646] Rebooting in 86400 seconds..