[info] Using makefile-style concurrent boot in runlevel 2.
[   40.819158][   T26] audit: type=1800 audit(1576011488.110:21): pid=7369 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0
[   40.854067][   T26] audit: type=1800 audit(1576011488.110:22): pid=7369 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 '10.128.0.196' (ECDSA) to the list of known hosts.
2019/12/10 20:58:21 fuzzer started
2019/12/10 20:58:22 dialing manager at 10.128.0.105:37821
2019/12/10 20:58:22 syscalls: 2689
2019/12/10 20:58:22 code coverage: enabled
2019/12/10 20:58:22 comparison tracing: enabled
2019/12/10 20:58:22 extra coverage: extra coverage is not supported by the kernel
2019/12/10 20:58:22 setuid sandbox: enabled
2019/12/10 20:58:22 namespace sandbox: enabled
2019/12/10 20:58:22 Android sandbox: /sys/fs/selinux/policy does not exist
2019/12/10 20:58:22 fault injection: enabled
2019/12/10 20:58:22 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/12/10 20:58:22 net packet injection: enabled
2019/12/10 20:58:22 net device setup: enabled
2019/12/10 20:58:22 concurrency sanitizer: enabled
2019/12/10 20:58:22 devlink PCI setup: PCI device 0000:00:10.0 is not available
2019/12/10 20:58:23 adding functions to KCSAN blacklist: 'do_syslog' '__hrtimer_run_queues' 'tomoyo_supervisor' 'run_timer_softirq' 'find_next_bit' 'taskstats_exit' 'ext4_free_inode' 
syzkaller login: [   56.314935][ T7531] ==================================================================
[   56.323090][ T7531] BUG: KCSAN: data-race in tcp_add_backlog / tcp_recvmsg
[   56.330101][ T7531] 
[   56.332416][ T7531] write to 0xffff8881267ca9f8 of 8 bytes by interrupt on cpu 0:
[   56.340041][ T7531]  tcp_add_backlog+0x476/0xce0
[   56.344803][ T7531]  tcp_v4_rcv+0x1a70/0x1bd0
[   56.349304][ T7531]  ip_protocol_deliver_rcu+0x4d/0x420
[   56.354662][ T7531]  ip_local_deliver_finish+0x110/0x140
[   56.360196][ T7531]  ip_local_deliver+0x133/0x210
[   56.365046][ T7531]  ip_rcv_finish+0x121/0x160
[   56.369746][ T7531]  ip_rcv+0x18f/0x1a0
[   56.373848][ T7531]  __netif_receive_skb_one_core+0xa7/0xe0
[   56.379561][ T7531]  __netif_receive_skb+0x37/0xf0
[   56.384484][ T7531]  netif_receive_skb_internal+0x59/0x190
[   56.390106][ T7531]  napi_gro_receive+0x28f/0x330
[   56.394948][ T7531]  receive_buf+0x284/0x30b0
[   56.399441][ T7531]  virtnet_poll+0x436/0x7d0
[   56.403944][ T7531]  net_rx_action+0x3ae/0xa90
[   56.408545][ T7531]  __do_softirq+0x115/0x33f
[   56.413051][ T7531]  irq_exit+0xbb/0xe0
[   56.417026][ T7531]  do_IRQ+0x81/0x130
[   56.420917][ T7531]  ret_from_intr+0x0/0x19
[   56.425238][ T7531]  native_safe_halt+0xe/0x10
[   56.429819][ T7531]  arch_cpu_idle+0xa/0x10
[   56.434131][ T7531]  default_idle_call+0x1e/0x40
[   56.438882][ T7531]  do_idle+0x1af/0x280
[   56.442944][ T7531]  cpu_startup_entry+0x1b/0x20
[   56.447833][ T7531]  rest_init+0xec/0xf6
[   56.451884][ T7531]  arch_call_rest_init+0x17/0x37
[   56.456854][ T7531]  start_kernel+0x838/0x85e
[   56.461351][ T7531]  x86_64_start_reservations+0x29/0x2b
[   56.467304][ T7531]  x86_64_start_kernel+0x72/0x76
[   56.472261][ T7531]  secondary_startup_64+0xa4/0xb0
[   56.477321][ T7531] 
[   56.479650][ T7531] read to 0xffff8881267ca9f8 of 8 bytes by task 7531 on cpu 1:
[   56.487223][ T7531]  tcp_recvmsg+0x46e/0x1b40
[   56.491729][ T7531]  inet_recvmsg+0xbb/0x250
[   56.496147][ T7531]  sock_recvmsg+0x92/0xb0
[   56.500510][ T7531]  sock_read_iter+0x15f/0x1e0
[   56.505170][ T7531]  new_sync_read+0x389/0x4f0
[   56.509753][ T7531]  __vfs_read+0xb1/0xc0
[   56.513914][ T7531]  vfs_read+0x143/0x2c0
[   56.518060][ T7531]  ksys_read+0xd5/0x1b0
[   56.522203][ T7531]  __x64_sys_read+0x4c/0x60
[   56.526889][ T7531]  do_syscall_64+0xcc/0x370
[   56.531391][ T7531]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   56.537261][ T7531] 
[   56.539569][ T7531] Reported by Kernel Concurrency Sanitizer on:
[   56.545764][ T7531] CPU: 1 PID: 7531 Comm: syz-fuzzer Not tainted 5.4.0-syzkaller #0
[   56.553630][ T7531] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   56.563676][ T7531] ==================================================================
[   56.571735][ T7531] Kernel panic - not syncing: panic_on_warn set ...
[   56.578315][ T7531] CPU: 1 PID: 7531 Comm: syz-fuzzer Not tainted 5.4.0-syzkaller #0
[   56.586190][ T7531] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   56.596236][ T7531] Call Trace:
[   56.599521][ T7531]  dump_stack+0x11d/0x181
[   56.603846][ T7531]  panic+0x210/0x640
[   56.607736][ T7531]  ? vprintk_func+0x8d/0x140
[   56.612321][ T7531]  kcsan_report.cold+0xc/0xd
[   56.616916][ T7531]  kcsan_setup_watchpoint+0x3fe/0x460
[   56.622280][ T7531]  __tsan_read8+0xc6/0x100
[   56.626691][ T7531]  tcp_recvmsg+0x46e/0x1b40
[   56.631199][ T7531]  inet_recvmsg+0xbb/0x250
[   56.635621][ T7531]  ? apparmor_socket_recvmsg+0x3b/0x50
[   56.641062][ T7531]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   56.647287][ T7531]  ? security_socket_recvmsg+0x92/0xb0
[   56.652727][ T7531]  ? inet_sendpage+0x100/0x100
[   56.657470][ T7531]  sock_recvmsg+0x92/0xb0
[   56.661779][ T7531]  sock_read_iter+0x15f/0x1e0
[   56.666455][ T7531]  new_sync_read+0x389/0x4f0
[   56.671029][ T7531]  __vfs_read+0xb1/0xc0
[   56.675168][ T7531]  vfs_read+0x143/0x2c0
[   56.679303][ T7531]  ksys_read+0xd5/0x1b0
[   56.683438][ T7531]  __x64_sys_read+0x4c/0x60
[   56.687925][ T7531]  do_syscall_64+0xcc/0x370
[   56.692425][ T7531]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   56.698299][ T7531] RIP: 0033:0x47c530
[   56.702179][ T7531] 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
[   56.721774][ T7531] RSP: 002b:000000c4203217d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000
[   56.730176][ T7531] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530
[   56.738137][ T7531] RDX: 0000000000001000 RSI: 000000c420318000 RDI: 0000000000000003
[   56.746099][ T7531] RBP: 000000c420321830 R08: 0000000000000000 R09: 0000000000000000
[   56.754065][ T7531] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000004
[   56.762027][ T7531] R13: 000000c420082b40 R14: 0000000000000002 R15: ffffffffffffffff
[   56.771390][ T7531] Kernel Offset: disabled
[   56.775730][ T7531] Rebooting in 86400 seconds..