[info] Using makefile-style concurrent boot in runlevel 2. [ 42.662562][ T26] audit: type=1800 audit(1573547126.386:21): pid=7317 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 42.700616][ T26] audit: type=1800 audit(1573547126.396:22): pid=7317 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 '10.128.1.46' (ECDSA) to the list of known hosts. 2019/11/12 08:25:37 fuzzer started 2019/11/12 08:25:39 dialing manager at 10.128.0.105:45453 2019/11/12 08:25:39 syscalls: 2566 2019/11/12 08:25:39 code coverage: enabled 2019/11/12 08:25:39 comparison tracing: enabled 2019/11/12 08:25:39 extra coverage: extra coverage is not supported by the kernel 2019/11/12 08:25:39 setuid sandbox: enabled 2019/11/12 08:25:39 namespace sandbox: enabled 2019/11/12 08:25:39 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/12 08:25:39 fault injection: enabled 2019/11/12 08:25:39 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/12 08:25:39 net packet injection: enabled 2019/11/12 08:25:39 net device setup: enabled 2019/11/12 08:25:39 concurrency sanitizer: enabled 2019/11/12 08:25:39 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/11/12 08:25:39 adding functions to KCSAN blacklist: '__hrtimer_run_queues' 'generic_file_read_iter' 'find_next_bit' syzkaller login: [ 56.090254][ T7484] ================================================================== [ 56.098595][ T7484] BUG: KCSAN: data-race in tcp_add_backlog / tcp_recvmsg [ 56.105607][ T7484] [ 56.107934][ T7484] write to 0xffff88812459aa38 of 8 bytes by interrupt on cpu 0: [ 56.115548][ T7484] tcp_add_backlog+0x476/0xce0 [ 56.120305][ T7484] tcp_v4_rcv+0x1a70/0x1bd0 [ 56.124838][ T7484] ip_protocol_deliver_rcu+0x4d/0x420 [ 56.130206][ T7484] ip_local_deliver_finish+0x110/0x140 [ 56.135654][ T7484] ip_local_deliver+0x133/0x210 [ 56.140501][ T7484] ip_rcv_finish+0x121/0x160 [ 56.145087][ T7484] ip_rcv+0x18f/0x1a0 [ 56.149050][ T7484] __netif_receive_skb_one_core+0xa7/0xe0 [ 56.154755][ T7484] __netif_receive_skb+0x37/0xf0 [ 56.159692][ T7484] netif_receive_skb_internal+0x59/0x190 [ 56.165306][ T7484] napi_gro_receive+0x28f/0x330 [ 56.170145][ T7484] receive_buf+0x284/0x30b0 [ 56.174630][ T7484] virtnet_poll+0x436/0x7d0 [ 56.179113][ T7484] net_rx_action+0x3ae/0xa90 [ 56.183689][ T7484] __do_softirq+0x115/0x33f [ 56.188175][ T7484] run_ksoftirqd+0x46/0x60 [ 56.192572][ T7484] smpboot_thread_fn+0x37d/0x4a0 [ 56.197504][ T7484] kthread+0x1d4/0x200 [ 56.201559][ T7484] ret_from_fork+0x1f/0x30 [ 56.205946][ T7484] [ 56.208257][ T7484] read to 0xffff88812459aa38 of 8 bytes by task 7484 on cpu 1: [ 56.215782][ T7484] tcp_recvmsg+0x46e/0x1b40 [ 56.220315][ T7484] inet_recvmsg+0xbb/0x250 [ 56.224729][ T7484] sock_recvmsg+0x92/0xb0 [ 56.229039][ T7484] sock_read_iter+0x15f/0x1e0 [ 56.233707][ T7484] new_sync_read+0x389/0x4f0 [ 56.238280][ T7484] __vfs_read+0xb1/0xc0 [ 56.242435][ T7484] vfs_read+0x143/0x2c0 [ 56.246585][ T7484] ksys_read+0xd5/0x1b0 [ 56.250764][ T7484] __x64_sys_read+0x4c/0x60 [ 56.255249][ T7484] do_syscall_64+0xcc/0x370 [ 56.260181][ T7484] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 56.266061][ T7484] [ 56.268367][ T7484] Reported by Kernel Concurrency Sanitizer on: [ 56.275109][ T7484] CPU: 1 PID: 7484 Comm: syz-fuzzer Not tainted 5.4.0-rc7+ #0 [ 56.282814][ T7484] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.293221][ T7484] ================================================================== [ 56.301263][ T7484] Kernel panic - not syncing: panic_on_warn set ... [ 56.307840][ T7484] CPU: 1 PID: 7484 Comm: syz-fuzzer Not tainted 5.4.0-rc7+ #0 [ 56.315534][ T7484] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.325569][ T7484] Call Trace: [ 56.328843][ T7484] dump_stack+0x11d/0x181 [ 56.333171][ T7484] panic+0x210/0x640 [ 56.337062][ T7484] ? vprintk_func+0x8d/0x140 [ 56.341648][ T7484] kcsan_report.cold+0xc/0x1a [ 56.346331][ T7484] kcsan_setup_watchpoint+0x3fe/0x460 [ 56.351700][ T7484] __tsan_read8+0xc6/0x100 [ 56.356100][ T7484] tcp_recvmsg+0x46e/0x1b40 [ 56.360610][ T7484] inet_recvmsg+0xbb/0x250 [ 56.365105][ T7484] ? apparmor_socket_recvmsg+0x3b/0x50 [ 56.370565][ T7484] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 56.376793][ T7484] ? security_socket_recvmsg+0x92/0xb0 [ 56.382248][ T7484] ? inet_sendpage+0x100/0x100 [ 56.386995][ T7484] sock_recvmsg+0x92/0xb0 [ 56.391319][ T7484] sock_read_iter+0x15f/0x1e0 [ 56.395999][ T7484] new_sync_read+0x389/0x4f0 [ 56.401274][ T7484] __vfs_read+0xb1/0xc0 [ 56.405416][ T7484] vfs_read+0x143/0x2c0 [ 56.409555][ T7484] ksys_read+0xd5/0x1b0 [ 56.413800][ T7484] __x64_sys_read+0x4c/0x60 [ 56.418305][ T7484] do_syscall_64+0xcc/0x370 [ 56.422818][ T7484] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 56.429126][ T7484] RIP: 0033:0x47c530 [ 56.433636][ T7484] 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 [ 56.453281][ T7484] RSP: 002b:000000c4203d37d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 56.461680][ T7484] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 56.469635][ T7484] RDX: 0000000000001000 RSI: 000000c4202aa000 RDI: 0000000000000003 [ 56.477589][ T7484] RBP: 000000c4203d3830 R08: 0000000000000000 R09: 0000000000000000 [ 56.485540][ T7484] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000020 [ 56.493555][ T7484] R13: ffffffffffffffff R14: 0000000000000004 R15: ffffffffffffffff [ 56.502998][ T7484] Kernel Offset: disabled [ 56.507378][ T7484] Rebooting in 86400 seconds..