[info] Using makefile-style concurrent boot in runlevel 2. [ 41.754448][ T26] audit: type=1800 audit(1575400250.838:21): pid=7331 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 41.786903][ T26] audit: type=1800 audit(1575400250.848:22): pid=7331 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 '10.128.1.34' (ECDSA) to the list of known hosts. 2019/12/03 19:11:02 fuzzer started 2019/12/03 19:11:04 dialing manager at 10.128.0.105:44523 2019/12/03 19:11:04 syscalls: 2684 2019/12/03 19:11:04 code coverage: enabled 2019/12/03 19:11:04 comparison tracing: enabled 2019/12/03 19:11:04 extra coverage: extra coverage is not supported by the kernel 2019/12/03 19:11:04 setuid sandbox: enabled 2019/12/03 19:11:04 namespace sandbox: enabled 2019/12/03 19:11:04 Android sandbox: /sys/fs/selinux/policy does not exist 2019/12/03 19:11:04 fault injection: enabled 2019/12/03 19:11:04 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/12/03 19:11:04 net packet injection: enabled 2019/12/03 19:11:04 net device setup: enabled 2019/12/03 19:11:04 concurrency sanitizer: enabled 2019/12/03 19:11:04 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/12/03 19:11:05 adding functions to KCSAN blacklist: '__hrtimer_run_queues' 'do_nanosleep' 'dccp_fin' 'generic_fillattr' 'tomoyo_supervisor' 'pipe_poll' 'generic_write_end' syzkaller login: [ 57.253957][ T7488] ================================================================== [ 57.262123][ T7488] BUG: KCSAN: data-race in tcp_add_backlog / tcp_recvmsg [ 57.269271][ T7488] [ 57.271604][ T7488] write to 0xffff8881264052f8 of 8 bytes by interrupt on cpu 1: [ 57.279332][ T7488] tcp_add_backlog+0x476/0xce0 [ 57.284079][ T7488] tcp_v4_rcv+0x1a70/0x1bd0 [ 57.288570][ T7488] ip_protocol_deliver_rcu+0x4d/0x420 [ 57.293936][ T7488] ip_local_deliver_finish+0x110/0x140 [ 57.299393][ T7488] ip_local_deliver+0x133/0x210 [ 57.304226][ T7488] ip_rcv_finish+0x121/0x160 [ 57.308794][ T7488] ip_rcv+0x18f/0x1a0 [ 57.312772][ T7488] __netif_receive_skb_one_core+0xa7/0xe0 [ 57.318483][ T7488] __netif_receive_skb+0x37/0xf0 [ 57.323406][ T7488] netif_receive_skb_internal+0x59/0x190 [ 57.329030][ T7488] napi_gro_receive+0x28f/0x330 [ 57.333879][ T7488] receive_buf+0x284/0x30b0 [ 57.338370][ T7488] virtnet_poll+0x436/0x7d0 [ 57.342895][ T7488] net_rx_action+0x3ae/0xa90 [ 57.347468][ T7488] __do_softirq+0x115/0x33f [ 57.352006][ T7488] run_ksoftirqd+0x46/0x60 [ 57.356398][ T7488] smpboot_thread_fn+0x37d/0x4a0 [ 57.361314][ T7488] kthread+0x1d4/0x200 [ 57.365375][ T7488] ret_from_fork+0x1f/0x30 [ 57.369762][ T7488] [ 57.372075][ T7488] read to 0xffff8881264052f8 of 8 bytes by task 7488 on cpu 0: [ 57.379600][ T7488] tcp_recvmsg+0x46e/0x1b40 [ 57.384085][ T7488] inet_recvmsg+0xbb/0x250 [ 57.388497][ T7488] sock_recvmsg+0x92/0xb0 [ 57.392804][ T7488] sock_read_iter+0x15f/0x1e0 [ 57.397485][ T7488] new_sync_read+0x389/0x4f0 [ 57.402062][ T7488] __vfs_read+0xb1/0xc0 [ 57.406202][ T7488] vfs_read+0x143/0x2c0 [ 57.410413][ T7488] ksys_read+0xd5/0x1b0 [ 57.414626][ T7488] __x64_sys_read+0x4c/0x60 [ 57.419115][ T7488] do_syscall_64+0xcc/0x370 [ 57.423600][ T7488] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 57.429465][ T7488] [ 57.431769][ T7488] Reported by Kernel Concurrency Sanitizer on: [ 57.437901][ T7488] CPU: 0 PID: 7488 Comm: syz-fuzzer Not tainted 5.4.0-syzkaller #0 [ 57.445783][ T7488] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.455819][ T7488] ================================================================== [ 57.463858][ T7488] Kernel panic - not syncing: panic_on_warn set ... [ 57.470427][ T7488] CPU: 0 PID: 7488 Comm: syz-fuzzer Not tainted 5.4.0-syzkaller #0 [ 57.478404][ T7488] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.488465][ T7488] Call Trace: [ 57.491765][ T7488] dump_stack+0x11d/0x181 [ 57.496102][ T7488] panic+0x210/0x640 [ 57.499997][ T7488] ? vprintk_func+0x8d/0x140 [ 57.504591][ T7488] kcsan_report.cold+0xc/0xd [ 57.509268][ T7488] kcsan_setup_watchpoint+0x3fe/0x460 [ 57.514625][ T7488] __tsan_read8+0xc6/0x100 [ 57.519042][ T7488] tcp_recvmsg+0x46e/0x1b40 [ 57.523557][ T7488] inet_recvmsg+0xbb/0x250 [ 57.527965][ T7488] ? apparmor_socket_recvmsg+0x3b/0x50 [ 57.533406][ T7488] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 57.539644][ T7488] ? security_socket_recvmsg+0x92/0xb0 [ 57.545086][ T7488] ? inet_sendpage+0x100/0x100 [ 57.549835][ T7488] sock_recvmsg+0x92/0xb0 [ 57.554148][ T7488] sock_read_iter+0x15f/0x1e0 [ 57.558817][ T7488] new_sync_read+0x389/0x4f0 [ 57.563400][ T7488] __vfs_read+0xb1/0xc0 [ 57.567558][ T7488] vfs_read+0x143/0x2c0 [ 57.571699][ T7488] ksys_read+0xd5/0x1b0 [ 57.575839][ T7488] __x64_sys_read+0x4c/0x60 [ 57.580324][ T7488] do_syscall_64+0xcc/0x370 [ 57.584812][ T7488] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 57.590685][ T7488] RIP: 0033:0x47c530 [ 57.594566][ T7488] 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 [ 57.614166][ T7488] RSP: 002b:000000c4204f7850 EFLAGS: 00000206 ORIG_RAX: 0000000000000000 [ 57.622595][ T7488] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 57.630569][ T7488] RDX: 0000000000001000 RSI: 000000c420384000 RDI: 0000000000000003 [ 57.638527][ T7488] RBP: 000000c4204f78a8 R08: 0000000000000000 R09: 0000000000000000 [ 57.646478][ T7488] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000004 [ 57.654429][ T7488] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 57.663721][ T7488] Kernel Offset: disabled [ 57.668047][ T7488] Rebooting in 86400 seconds..