[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[ 42.903664][ T26] audit: type=1800 audit(1570192616.002:25): pid=7149 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[ 42.925353][ T26] audit: type=1800 audit(1570192616.002:26): pid=7149 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0
[ 42.963717][ T26] audit: type=1800 audit(1570192616.002:27): pid=7149 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0
[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
Debian GNU/Linux 7 syzkaller ttyS0
Warning: Permanently added '10.128.15.192' (ECDSA) to the list of known hosts.
2019/10/04 12:37:03 fuzzer started
2019/10/04 12:37:04 dialing manager at 10.128.0.105:38119
2019/10/04 12:37:04 syscalls: 2523
2019/10/04 12:37:04 code coverage: enabled
2019/10/04 12:37:04 comparison tracing: enabled
2019/10/04 12:37:04 extra coverage: extra coverage is not supported by the kernel
2019/10/04 12:37:04 setuid sandbox: enabled
2019/10/04 12:37:04 namespace sandbox: enabled
2019/10/04 12:37:04 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/04 12:37:04 fault injection: enabled
2019/10/04 12:37:04 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/04 12:37:04 net packet injection: enabled
2019/10/04 12:37:04 net device setup: enabled
2019/10/04 12:37:04 concurrency sanitizer: enabled
syzkaller login: [ 51.510817][ C0] ==================================================================
[ 51.519046][ C0] BUG: KCSAN: data-race in tcp_add_backlog+0x4a0/0xcc0 and tcp_grow_window.isra.0+0x6b/0x480
[ 51.529189][ C0]
[ 51.531696][ C0] read to 0xffff888126450a2c of 4 bytes by task 7311 on cpu 1:
[ 51.539222][ C0] tcp_grow_window.isra.0+0x6b/0x480
[ 51.544577][ C0] tcp_event_data_recv+0x68f/0x990
[ 51.550367][ C0] tcp_rcv_established+0xbfe/0xf50
[ 51.555724][ C0] tcp_v4_do_rcv+0x381/0x4e0
[ 51.560566][ C0] __release_sock+0x135/0x1e0
[ 51.565401][ C0] release_sock+0x61/0x160
[ 51.569799][ C0] tcp_recvmsg+0x63b/0x1a30
[ 51.574298][ C0] inet_recvmsg+0xbb/0x250
[ 51.578969][ C0] sock_recvmsg+0x92/0xb0
[ 51.583452][ C0] sock_read_iter+0x15f/0x1e0
[ 51.588111][ C0] new_sync_read+0x389/0x4f0
[ 51.592700][ C0] __vfs_read+0xb1/0xc0
[ 51.596836][ C0] vfs_read+0x143/0x2c0
[ 51.600972][ C0] ksys_read+0xd5/0x1b0
[ 51.605099][ C0]
[ 51.607416][ C0] write to 0xffff888126450a2c of 4 bytes by interrupt on cpu 0:
[ 51.615037][ C0] tcp_add_backlog+0x4a0/0xcc0
[ 51.619781][ C0] tcp_v4_rcv+0x1aba/0x1bf0
[ 51.624267][ C0] ip_protocol_deliver_rcu+0x51/0x470
[ 51.629747][ C0] ip_local_deliver_finish+0x110/0x140
[ 51.635198][ C0] ip_local_deliver+0x133/0x210
[ 51.640029][ C0] ip_rcv_finish+0x121/0x160
[ 51.644602][ C0] ip_rcv+0x18f/0x1a0
[ 51.648829][ C0] __netif_receive_skb_one_core+0xa7/0xe0
[ 51.654529][ C0] __netif_receive_skb+0x37/0xf0
[ 51.659456][ C0] netif_receive_skb_internal+0x59/0x190
[ 51.665076][ C0] napi_gro_receive+0x28f/0x330
[ 51.669910][ C0] receive_buf+0x284/0x30b0
[ 51.674569][ C0] virtnet_poll+0x436/0x7d0
[ 51.679131][ C0]
[ 51.681438][ C0] Reported by Kernel Concurrency Sanitizer on:
[ 51.687591][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0
[ 51.694330][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 51.704799][ C0] ==================================================================
[ 51.713013][ C0] Kernel panic - not syncing: panic_on_warn set ...
[ 51.719581][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0
[ 51.726334][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 51.736891][ C0] Call Trace:
[ 51.740164][ C0]
[ 51.743010][ C0] dump_stack+0xf5/0x159
[ 51.747511][ C0] panic+0x209/0x639
[ 51.754013][ C0] ? vprintk_func+0x8d/0x140
[ 51.758613][ C0] kcsan_report.cold+0x57/0xeb
[ 51.763383][ C0] __kcsan_setup_watchpoint+0x342/0x500
[ 51.768913][ C0] __tsan_write4+0x32/0x40
[ 51.773322][ C0] tcp_add_backlog+0x4a0/0xcc0
[ 51.778593][ C0] ? __rcu_read_unlock+0x62/0xe0
[ 51.783545][ C0] tcp_v4_rcv+0x1aba/0x1bf0
[ 51.788403][ C0] ? __tsan_read8+0x2c/0x30
[ 51.793165][ C0] ip_protocol_deliver_rcu+0x51/0x470
[ 51.798522][ C0] ip_local_deliver_finish+0x110/0x140
[ 51.803965][ C0] ip_local_deliver+0x133/0x210
[ 51.808808][ C0] ? ip_protocol_deliver_rcu+0x470/0x470
[ 51.814515][ C0] ip_rcv_finish+0x121/0x160
[ 51.819609][ C0] ip_rcv+0x18f/0x1a0
[ 51.823579][ C0] ? ip_sublist_rcv+0x5e0/0x5e0
[ 51.828421][ C0] ? ip_local_deliver+0x210/0x210
[ 51.833432][ C0] __netif_receive_skb_one_core+0xa7/0xe0
[ 51.839223][ C0] __netif_receive_skb+0x37/0xf0
[ 51.844144][ C0] netif_receive_skb_internal+0x59/0x190
[ 51.849762][ C0] napi_gro_receive+0x28f/0x330
[ 51.854697][ C0] receive_buf+0x284/0x30b0
[ 51.859449][ C0] ? __tsan_write8+0x32/0x40
[ 51.864116][ C0] ? virtqueue_get_buf_ctx+0x4fd/0x5c0
[ 51.869558][ C0] ? virtqueue_get_buf+0x31/0x40
[ 51.874675][ C0] virtnet_poll+0x436/0x7d0
[ 51.879526][ C0] net_rx_action+0x3ae/0xa50
[ 51.884115][ C0] __do_softirq+0x115/0x33f
[ 51.888879][ C0] irq_exit+0xbb/0xe0
[ 51.892852][ C0] do_IRQ+0xdf/0x150
[ 51.896732][ C0] common_interrupt+0xf/0xf
[ 51.901214][ C0]
[ 51.904139][ C0] RIP: 0010:native_safe_halt+0xe/0x10
[ 51.909499][ C0] Code: 90 90 90 90 90 90 90 90 90 90 90 90 e9 07 00 00 00 0f 00 2d 8c d2 4e 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 7c d2 4e 00 fb f4 90 55 48 89 e5 41 55 41 54 53 e8 82 78 a7 fc e8 5d 4e b9 fd 0f
[ 51.929444][ C0] RSP: 0018:ffffffff85a03de0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffffda
[ 51.938984][ C0] RAX: 978d4fdf3b646ddb RBX: 0000000000000000 RCX: 00000000000004ab
[ 51.946943][ C0] RDX: 0000000000111ed0 RSI: 020c49ba5e353f7d RDI: ffffffff85a55a28
[ 51.954906][ C0] RBP: ffffffff85a03e18 R08: 0000000000000000 R09: 0000ffff85a55a2f
[ 51.962861][ C0] R10: 00000000aaaaaaab R11: ffffffff86042cc0 R12: ffffffff85a2b780
[ 51.970832][ C0] R13: ffffffff85a2b780 R14: 0000000000000000 R15: 0000000000000000
[ 51.978817][ C0] ? default_idle+0x50/0x230
[ 51.983575][ C0] arch_cpu_idle+0x1f/0x30
[ 51.988212][ C0] default_idle_call+0x1e/0x40
[ 51.992982][ C0] do_idle+0x1ea/0x2c0
[ 51.997054][ C0] cpu_startup_entry+0x1b/0x20
[ 52.001809][ C0] rest_init+0xec/0xf6
[ 52.005870][ C0] ? trace_event_define_fields_vector_free_moved+0xce/0xce
[ 52.013066][ C0] arch_call_rest_init+0x17/0x37
[ 52.018034][ C0] start_kernel+0x83e/0x864
[ 52.022545][ C0] x86_64_start_reservations+0x29/0x2b
[ 52.027996][ C0] x86_64_start_kernel+0x72/0x76
[ 52.033096][ C0] secondary_startup_64+0xa4/0xb0
[ 52.039614][ C0] Kernel Offset: disabled
[ 52.043984][ C0] Rebooting in 86400 seconds..