[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[ 34.980435][ T25] audit: type=1800 audit(1570191528.459:25): pid=7111 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[ 35.000164][ T25] audit: type=1800 audit(1570191528.459:26): pid=7111 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0
[ 35.020264][ T25] audit: type=1800 audit(1570191528.459:27): pid=7111 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 '10.128.0.42' (ECDSA) to the list of known hosts.
2019/10/04 12:18:57 fuzzer started
2019/10/04 12:18:59 dialing manager at 10.128.0.105:38119
2019/10/04 12:18:59 syscalls: 2523
2019/10/04 12:18:59 code coverage: enabled
2019/10/04 12:18:59 comparison tracing: enabled
2019/10/04 12:18:59 extra coverage: extra coverage is not supported by the kernel
2019/10/04 12:18:59 setuid sandbox: enabled
2019/10/04 12:18:59 namespace sandbox: enabled
2019/10/04 12:18:59 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/04 12:18:59 fault injection: enabled
2019/10/04 12:18:59 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/04 12:18:59 net packet injection: enabled
2019/10/04 12:18:59 net device setup: enabled
2019/10/04 12:18:59 concurrency sanitizer: enabled
syzkaller login: [ 45.701208][ C1] ==================================================================
[ 45.709390][ C1] BUG: KCSAN: data-race in tcp_add_backlog+0x4a0/0xcc0 and tcp_grow_window.isra.0+0x6b/0x480
[ 45.719514][ C1]
[ 45.721829][ C1] read to 0xffff88812a2fea2c of 4 bytes by task 7276 on cpu 0:
[ 45.729375][ C1] tcp_grow_window.isra.0+0x6b/0x480
[ 45.734644][ C1] tcp_event_data_recv+0x68f/0x990
[ 45.739736][ C1] tcp_rcv_established+0xbfe/0xf50
[ 45.744830][ C1] tcp_v4_do_rcv+0x381/0x4e0
[ 45.749407][ C1] __release_sock+0x135/0x1e0
[ 45.754080][ C1] release_sock+0x61/0x160
[ 45.758482][ C1] tcp_recvmsg+0x63b/0x1a30
[ 45.762970][ C1] inet_recvmsg+0xbb/0x250
[ 45.767365][ C1] sock_recvmsg+0x92/0xb0
[ 45.771716][ C1] sock_read_iter+0x15f/0x1e0
[ 45.776390][ C1] new_sync_read+0x389/0x4f0
[ 45.780968][ C1] __vfs_read+0xb1/0xc0
[ 45.785111][ C1] vfs_read+0x143/0x2c0
[ 45.789250][ C1] ksys_read+0xd5/0x1b0
[ 45.793377][ C1]
[ 45.795692][ C1] write to 0xffff88812a2fea2c of 4 bytes by interrupt on cpu 1:
[ 45.803306][ C1] tcp_add_backlog+0x4a0/0xcc0
[ 45.808051][ C1] tcp_v4_rcv+0x1aba/0x1bf0
[ 45.812547][ C1] ip_protocol_deliver_rcu+0x51/0x470
[ 45.817899][ C1] ip_local_deliver_finish+0x110/0x140
[ 45.823336][ C1] ip_local_deliver+0x133/0x210
[ 45.828182][ C1] ip_rcv_finish+0x121/0x160
[ 45.832759][ C1] ip_rcv+0x18f/0x1a0
[ 45.836732][ C1] __netif_receive_skb_one_core+0xa7/0xe0
[ 45.842442][ C1] __netif_receive_skb+0x37/0xf0
[ 45.847362][ C1] netif_receive_skb_internal+0x59/0x190
[ 45.852985][ C1] napi_gro_receive+0x28f/0x330
[ 45.857822][ C1] receive_buf+0x284/0x30b0
[ 45.862307][ C1] virtnet_poll+0x436/0x7d0
[ 45.866892][ C1]
[ 45.869200][ C1] Reported by Kernel Concurrency Sanitizer on:
[ 45.875352][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0
[ 45.882095][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 45.892132][ C1] ==================================================================
[ 45.900172][ C1] Kernel panic - not syncing: panic_on_warn set ...
[ 45.906741][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0
[ 45.913485][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 45.923522][ C1] Call Trace:
[ 45.926785][ C1]
[ 45.929628][ C1] dump_stack+0xf5/0x159
[ 45.933855][ C1] panic+0x209/0x639
[ 45.937747][ C1] ? vprintk_func+0x8d/0x140
[ 45.942324][ C1] kcsan_report.cold+0x57/0xeb
[ 45.947073][ C1] __kcsan_setup_watchpoint+0x342/0x500
[ 45.952607][ C1] __tsan_write4+0x32/0x40
[ 45.957014][ C1] tcp_add_backlog+0x4a0/0xcc0
[ 45.961775][ C1] ? __rcu_read_unlock+0x62/0xe0
[ 45.966707][ C1] tcp_v4_rcv+0x1aba/0x1bf0
[ 45.971191][ C1] ? __tsan_read8+0x2c/0x30
[ 45.975686][ C1] ip_protocol_deliver_rcu+0x51/0x470
[ 45.981045][ C1] ip_local_deliver_finish+0x110/0x140
[ 45.986487][ C1] ip_local_deliver+0x133/0x210
[ 45.991322][ C1] ? ip_protocol_deliver_rcu+0x470/0x470
[ 45.996940][ C1] ip_rcv_finish+0x121/0x160
[ 46.001537][ C1] ip_rcv+0x18f/0x1a0
[ 46.005515][ C1] ? ip_sublist_rcv+0x5e0/0x5e0
[ 46.010346][ C1] ? ip_local_deliver+0x210/0x210
[ 46.015356][ C1] __netif_receive_skb_one_core+0xa7/0xe0
[ 46.021064][ C1] __netif_receive_skb+0x37/0xf0
[ 46.025989][ C1] netif_receive_skb_internal+0x59/0x190
[ 46.031606][ C1] napi_gro_receive+0x28f/0x330
[ 46.036450][ C1] receive_buf+0x284/0x30b0
[ 46.040934][ C1] ? __tsan_write8+0x32/0x40
[ 46.045514][ C1] ? virtqueue_get_buf_ctx+0x4fd/0x5c0
[ 46.050953][ C1] ? virtqueue_get_buf+0x31/0x40
[ 46.055876][ C1] virtnet_poll+0x436/0x7d0
[ 46.060366][ C1] net_rx_action+0x3ae/0xa50
[ 46.064944][ C1] __do_softirq+0x115/0x33f
[ 46.069434][ C1] irq_exit+0xbb/0xe0
[ 46.073396][ C1] do_IRQ+0xdf/0x150
[ 46.077275][ C1] common_interrupt+0xf/0xf
[ 46.081765][ C1]
[ 46.084694][ C1] RIP: 0010:native_safe_halt+0xe/0x10
[ 46.090047][ 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
[ 46.109630][ C1] RSP: 0018:ffffc90000cd3e48 EFLAGS: 00000282 ORIG_RAX: ffffffffffffffde
[ 46.118023][ C1] RAX: c8b439581062537a RBX: 0000000000000001 RCX: 0000000000000625
[ 46.125974][ C1] RDX: 000000000004e200 RSI: 020c49ba5e353f7d RDI: ffffffff85a55a28
[ 46.133931][ C1] RBP: ffffc90000cd3e80 R08: 0000000000000000 R09: 0000ffff85a55a2f
[ 46.141883][ C1] R10: 00000000aaaaaaab R11: ffffffff86042cc0 R12: ffff88812b38b0c0
[ 46.149835][ C1] R13: ffff88812b38b0c0 R14: 0000000000000000 R15: 0000000000000000
[ 46.157805][ C1] ? default_idle+0x50/0x230
[ 46.162385][ C1] arch_cpu_idle+0x1f/0x30
[ 46.166782][ C1] default_idle_call+0x1e/0x40
[ 46.171526][ C1] do_idle+0x1ea/0x2c0
[ 46.175575][ C1] ? complete+0x44/0x50
[ 46.179714][ C1] cpu_startup_entry+0x1b/0x20
[ 46.184460][ C1] start_secondary+0x207/0x260
[ 46.189209][ C1] secondary_startup_64+0xa4/0xb0
[ 46.195489][ C1] Kernel Offset: disabled
[ 46.199805][ C1] Rebooting in 86400 seconds..