[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[ 35.831494][ T26] audit: type=1800 audit(1570191717.636:25): pid=6921 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[ 35.851230][ T26] audit: type=1800 audit(1570191717.636:26): pid=6921 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0
[ 35.878032][ T26] audit: type=1800 audit(1570191717.636:27): pid=6921 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 '10.128.1.44' (ECDSA) to the list of known hosts.
2019/10/04 12:22:08 fuzzer started
2019/10/04 12:22:09 dialing manager at 10.128.0.105:38119
2019/10/04 12:22:10 syscalls: 2523
2019/10/04 12:22:10 code coverage: enabled
2019/10/04 12:22:10 comparison tracing: enabled
2019/10/04 12:22:10 extra coverage: extra coverage is not supported by the kernel
2019/10/04 12:22:10 setuid sandbox: enabled
2019/10/04 12:22:10 namespace sandbox: enabled
2019/10/04 12:22:10 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/04 12:22:10 fault injection: enabled
2019/10/04 12:22:10 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/04 12:22:10 net packet injection: enabled
2019/10/04 12:22:10 net device setup: enabled
2019/10/04 12:22:10 concurrency sanitizer: enabled
syzkaller login: [ 48.445218][ C1] ==================================================================
[ 48.453420][ C1] BUG: KCSAN: data-race in __tcp_select_window+0x6b/0x4d0 and tcp_add_backlog+0x4a0/0xcc0
[ 48.463626][ C1]
[ 48.465954][ C1] read to 0xffff888124d169ec of 4 bytes by task 7079 on cpu 0:
[ 48.473488][ C1] __tcp_select_window+0x6b/0x4d0
[ 48.478521][ C1] __tcp_transmit_skb+0x679/0x1cd0
[ 48.483622][ C1] __tcp_send_ack+0x246/0x300
[ 48.488283][ C1] tcp_send_ack+0x34/0x40
[ 48.492594][ C1] tcp_cleanup_rbuf+0x130/0x360
[ 48.497425][ C1] tcp_recvmsg+0x633/0x1a30
[ 48.501913][ C1] inet_recvmsg+0xbb/0x250
[ 48.506315][ C1] sock_recvmsg+0x92/0xb0
[ 48.510626][ C1] sock_read_iter+0x15f/0x1e0
[ 48.516079][ C1] new_sync_read+0x389/0x4f0
[ 48.520663][ C1] __vfs_read+0xb1/0xc0
[ 48.524804][ C1] vfs_read+0x143/0x2c0
[ 48.528944][ C1] ksys_read+0xd5/0x1b0
[ 48.533083][ C1] __x64_sys_read+0x4c/0x60
[ 48.537558][ C1]
[ 48.539873][ C1] write to 0xffff888124d169ec of 4 bytes by interrupt on cpu 1:
[ 48.547482][ C1] tcp_add_backlog+0x4a0/0xcc0
[ 48.552234][ C1] tcp_v4_rcv+0x1aba/0x1bf0
[ 48.556717][ C1] ip_protocol_deliver_rcu+0x51/0x470
[ 48.562067][ C1] ip_local_deliver_finish+0x110/0x140
[ 48.567503][ C1] ip_local_deliver+0x133/0x210
[ 48.572333][ C1] ip_rcv_finish+0x121/0x160
[ 48.576990][ C1] ip_rcv+0x18f/0x1a0
[ 48.580957][ C1] __netif_receive_skb_one_core+0xa7/0xe0
[ 48.586657][ C1] __netif_receive_skb+0x37/0xf0
[ 48.591579][ C1] netif_receive_skb_internal+0x59/0x190
[ 48.597188][ C1] napi_gro_receive+0x28f/0x330
[ 48.602031][ C1] receive_buf+0x284/0x30b0
[ 48.606515][ C1] virtnet_poll+0x436/0x7d0
[ 48.610992][ C1]
[ 48.613296][ C1] Reported by Kernel Concurrency Sanitizer on:
[ 48.619435][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0
[ 48.626170][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 48.636207][ C1] ==================================================================
[ 48.644245][ C1] Kernel panic - not syncing: panic_on_warn set ...
[ 48.650811][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0
[ 48.657548][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 48.667581][ C1] Call Trace:
[ 48.670844][ C1]
[ 48.673688][ C1] dump_stack+0xf5/0x159
[ 48.677917][ C1] panic+0x209/0x639
[ 48.681795][ C1] ? vprintk_func+0x8d/0x140
[ 48.686372][ C1] kcsan_report.cold+0x57/0xeb
[ 48.691122][ C1] __kcsan_setup_watchpoint+0x342/0x500
[ 48.696659][ C1] __tsan_write4+0x32/0x40
[ 48.701056][ C1] tcp_add_backlog+0x4a0/0xcc0
[ 48.705821][ C1] ? __rcu_read_unlock+0x62/0xe0
[ 48.710746][ C1] tcp_v4_rcv+0x1aba/0x1bf0
[ 48.715240][ C1] ? __tsan_read8+0x2c/0x30
[ 48.719743][ C1] ip_protocol_deliver_rcu+0x51/0x470
[ 48.725105][ C1] ip_local_deliver_finish+0x110/0x140
[ 48.730545][ C1] ip_local_deliver+0x133/0x210
[ 48.735381][ C1] ? ip_protocol_deliver_rcu+0x470/0x470
[ 48.740995][ C1] ip_rcv_finish+0x121/0x160
[ 48.745566][ C1] ip_rcv+0x18f/0x1a0
[ 48.749534][ C1] ? ip_sublist_rcv+0x5e0/0x5e0
[ 48.754364][ C1] ? ip_local_deliver+0x210/0x210
[ 48.759372][ C1] __netif_receive_skb_one_core+0xa7/0xe0
[ 48.765076][ C1] __netif_receive_skb+0x37/0xf0
[ 48.769997][ C1] netif_receive_skb_internal+0x59/0x190
[ 48.775611][ C1] napi_gro_receive+0x28f/0x330
[ 48.780557][ C1] receive_buf+0x284/0x30b0
[ 48.785044][ C1] ? __tsan_write8+0x32/0x40
[ 48.789621][ C1] ? virtqueue_get_buf_ctx+0x4fd/0x5c0
[ 48.795066][ C1] ? virtqueue_get_buf+0x31/0x40
[ 48.799990][ C1] virtnet_poll+0x436/0x7d0
[ 48.804482][ C1] net_rx_action+0x3ae/0xa50
[ 48.809078][ C1] __do_softirq+0x115/0x33f
[ 48.813575][ C1] irq_exit+0xbb/0xe0
[ 48.817549][ C1] do_IRQ+0xdf/0x150
[ 48.821431][ C1] common_interrupt+0xf/0xf
[ 48.825913][ C1]
[ 48.828837][ C1] RIP: 0010:native_safe_halt+0xe/0x10
[ 48.834196][ C1] 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
[ 48.853782][ C1] RSP: 0018:ffffc90000cd3e48 EFLAGS: 00000282 ORIG_RAX: ffffffffffffffde
[ 48.862174][ C1] RAX: 0e5604189374e21b RBX: 0000000000000001 RCX: 000000000000007f
[ 48.870126][ C1] RDX: 000000000020b700 RSI: 020c49ba5e353f7d RDI: ffffffff85a55a28
[ 48.878078][ C1] RBP: ffffc90000cd3e80 R08: 0000000000000000 R09: 0000ffff85a55a2f
[ 48.886031][ C1] R10: 00000000aaaaaaab R11: ffffffff86042cc0 R12: ffff88812b38b0c0
[ 48.894001][ C1] R13: ffff88812b38b0c0 R14: 0000000000000000 R15: 0000000000000000
[ 48.901971][ C1] ? default_idle+0x50/0x230
[ 48.906548][ C1] arch_cpu_idle+0x1f/0x30
[ 48.910977][ C1] default_idle_call+0x1e/0x40
[ 48.915725][ C1] do_idle+0x1ea/0x2c0
[ 48.919777][ C1] ? complete+0x44/0x50
[ 48.923927][ C1] cpu_startup_entry+0x1b/0x20
[ 48.928679][ C1] start_secondary+0x207/0x260
[ 48.933426][ C1] secondary_startup_64+0xa4/0xb0
[ 48.939864][ C1] Kernel Offset: disabled
[ 48.944185][ C1] Rebooting in 86400 seconds..