[info] Using makefile-style concurrent boot in runlevel 2.
[   41.846183][   T26] audit: type=1800 audit(1573881630.910:21): pid=7470 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0
[   41.895076][   T26] audit: type=1800 audit(1573881630.910:22): pid=7470 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 '10.128.0.186' (ECDSA) to the list of known hosts.
2019/11/16 05:20:41 fuzzer started
2019/11/16 05:20:43 dialing manager at 10.128.0.105:34521
2019/11/16 05:20:43 syscalls: 2566
2019/11/16 05:20:43 code coverage: enabled
2019/11/16 05:20:43 comparison tracing: enabled
2019/11/16 05:20:43 extra coverage: extra coverage is not supported by the kernel
2019/11/16 05:20:43 setuid sandbox: enabled
2019/11/16 05:20:43 namespace sandbox: enabled
2019/11/16 05:20:43 Android sandbox: /sys/fs/selinux/policy does not exist
2019/11/16 05:20:43 fault injection: enabled
2019/11/16 05:20:43 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/11/16 05:20:43 net packet injection: enabled
2019/11/16 05:20:43 net device setup: enabled
2019/11/16 05:20:43 concurrency sanitizer: enabled
2019/11/16 05:20:43 devlink PCI setup: PCI device 0000:00:10.0 is not available
2019/11/16 05:20:43 adding functions to KCSAN blacklist: 'pipe_wait' 'find_next_bit' 'pipe_poll' 'ext4_has_free_clusters' '__hrtimer_run_queues' 
syzkaller login: [   54.788367][ T7623] ==================================================================
[   54.796494][ T7623] BUG: KCSAN: data-race in tcp_add_backlog / tcp_recvmsg
[   54.803488][ T7623] 
[   54.805800][ T7623] write to 0xffff888124be32f8 of 8 bytes by interrupt on cpu 0:
[   54.813467][ T7623]  tcp_add_backlog+0x476/0xce0
[   54.818212][ T7623]  tcp_v4_rcv+0x1a70/0x1bd0
[   54.822806][ T7623]  ip_protocol_deliver_rcu+0x4d/0x420
[   54.828159][ T7623]  ip_local_deliver_finish+0x110/0x140
[   54.833600][ T7623]  ip_local_deliver+0x133/0x210
[   54.838696][ T7623]  ip_rcv_finish+0x121/0x160
[   54.843268][ T7623]  ip_rcv+0x18f/0x1a0
[   54.847247][ T7623]  __netif_receive_skb_one_core+0xa7/0xe0
[   54.852946][ T7623]  __netif_receive_skb+0x37/0xf0
[   54.857995][ T7623]  netif_receive_skb_internal+0x59/0x190
[   54.863610][ T7623]  napi_gro_receive+0x28f/0x330
[   54.868445][ T7623]  receive_buf+0x284/0x30b0
[   54.872946][ T7623]  virtnet_poll+0x436/0x7d0
[   54.877430][ T7623]  net_rx_action+0x3ae/0xa90
[   54.882003][ T7623]  __do_softirq+0x115/0x33f
[   54.886486][ T7623]  irq_exit+0xbb/0xe0
[   54.890446][ T7623]  do_IRQ+0x81/0x130
[   54.894335][ T7623]  ret_from_intr+0x0/0x19
[   54.898646][ T7623]  native_safe_halt+0xe/0x10
[   54.903217][ T7623]  arch_cpu_idle+0xa/0x10
[   54.907529][ T7623]  default_idle_call+0x1e/0x40
[   54.912270][ T7623]  do_idle+0x1af/0x280
[   54.916333][ T7623]  cpu_startup_entry+0x1b/0x20
[   54.921088][ T7623]  rest_init+0xec/0xf6
[   54.925144][ T7623]  arch_call_rest_init+0x17/0x37
[   54.930071][ T7623]  start_kernel+0x838/0x85e
[   54.934557][ T7623]  x86_64_start_reservations+0x29/0x2b
[   54.940007][ T7623]  x86_64_start_kernel+0x72/0x76
[   54.944925][ T7623]  secondary_startup_64+0xa4/0xb0
[   54.949919][ T7623] 
[   54.952230][ T7623] read to 0xffff888124be32f8 of 8 bytes by task 7623 on cpu 1:
[   54.959752][ T7623]  tcp_recvmsg+0x46e/0x1b40
[   54.964254][ T7623]  inet_recvmsg+0xbb/0x250
[   54.968647][ T7623]  sock_recvmsg+0x92/0xb0
[   54.972956][ T7623]  sock_read_iter+0x15f/0x1e0
[   54.977614][ T7623]  new_sync_read+0x389/0x4f0
[   54.982197][ T7623]  __vfs_read+0xb1/0xc0
[   54.986342][ T7623]  vfs_read+0x143/0x2c0
[   54.990477][ T7623]  ksys_read+0xd5/0x1b0
[   54.994663][ T7623]  __x64_sys_read+0x4c/0x60
[   54.999220][ T7623]  do_syscall_64+0xcc/0x370
[   55.003713][ T7623]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   55.009581][ T7623] 
[   55.011886][ T7623] Reported by Kernel Concurrency Sanitizer on:
[   55.018021][ T7623] CPU: 1 PID: 7623 Comm: syz-fuzzer Not tainted 5.4.0-rc7+ #0
[   55.025464][ T7623] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   55.035496][ T7623] ==================================================================
[   55.043537][ T7623] Kernel panic - not syncing: panic_on_warn set ...
[   55.050104][ T7623] CPU: 1 PID: 7623 Comm: syz-fuzzer Not tainted 5.4.0-rc7+ #0
[   55.057547][ T7623] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   55.067577][ T7623] Call Trace:
[   55.070866][ T7623]  dump_stack+0x11d/0x181
[   55.075179][ T7623]  panic+0x210/0x640
[   55.079056][ T7623]  ? vprintk_func+0x8d/0x140
[   55.083632][ T7623]  kcsan_report.cold+0xc/0xd
[   55.088209][ T7623]  kcsan_setup_watchpoint+0x3fe/0x460
[   55.093567][ T7623]  __tsan_read8+0xc6/0x100
[   55.097976][ T7623]  tcp_recvmsg+0x46e/0x1b40
[   55.102482][ T7623]  inet_recvmsg+0xbb/0x250
[   55.106876][ T7623]  ? apparmor_socket_recvmsg+0x3b/0x50
[   55.112403][ T7623]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   55.118647][ T7623]  ? security_socket_recvmsg+0x92/0xb0
[   55.124090][ T7623]  ? inet_sendpage+0x100/0x100
[   55.128832][ T7623]  sock_recvmsg+0x92/0xb0
[   55.133151][ T7623]  sock_read_iter+0x15f/0x1e0
[   55.137825][ T7623]  new_sync_read+0x389/0x4f0
[   55.142422][ T7623]  __vfs_read+0xb1/0xc0
[   55.146570][ T7623]  vfs_read+0x143/0x2c0
[   55.150703][ T7623]  ksys_read+0xd5/0x1b0
[   55.154844][ T7623]  __x64_sys_read+0x4c/0x60
[   55.159343][ T7623]  do_syscall_64+0xcc/0x370
[   55.163827][ T7623]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   55.169694][ T7623] RIP: 0033:0x47c530
[   55.173573][ T7623] 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
[   55.193154][ T7623] RSP: 002b:000000c4204eb7d0 EFLAGS: 00000202 ORIG_RAX: 0000000000000000
[   55.201554][ T7623] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530
[   55.209511][ T7623] RDX: 0000000000001000 RSI: 000000c420326000 RDI: 0000000000000003
[   55.217508][ T7623] RBP: 000000c4204eb828 R08: 0000000000000000 R09: 0000000000000000
[   55.225516][ T7623] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000002
[   55.233470][ T7623] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff
[   55.243027][ T7623] Kernel Offset: disabled
[   55.247399][ T7623] Rebooting in 86400 seconds..