[?25l[?1c7[ ok 8[?25h[?0c. [ 38.920826][ T26] audit: type=1800 audit(1570192096.774:25): pid=7124 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 38.963063][ T26] audit: type=1800 audit(1570192096.784:26): pid=7124 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 38.991847][ T26] audit: type=1800 audit(1570192096.784:27): pid=7124 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[ 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 '10.128.0.131' (ECDSA) to the list of known hosts. 2019/10/04 12:28:26 fuzzer started 2019/10/04 12:28:27 dialing manager at 10.128.0.105:38119 2019/10/04 12:28:27 syscalls: 2523 2019/10/04 12:28:27 code coverage: enabled 2019/10/04 12:28:27 comparison tracing: enabled 2019/10/04 12:28:27 extra coverage: extra coverage is not supported by the kernel 2019/10/04 12:28:27 setuid sandbox: enabled 2019/10/04 12:28:27 namespace sandbox: enabled 2019/10/04 12:28:27 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/04 12:28:27 fault injection: enabled 2019/10/04 12:28:27 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/04 12:28:27 net packet injection: enabled 2019/10/04 12:28:27 net device setup: enabled 2019/10/04 12:28:27 concurrency sanitizer: enabled syzkaller login: [ 49.749939][ T7284] ld (7284) used greatest stack depth: 10032 bytes left [ 49.869174][ T7278] ================================================================== [ 49.877556][ T7278] BUG: KCSAN: data-race in tcp_add_backlog+0x45a/0xcc0 and tcp_recvmsg+0x470/0x1a30 [ 49.887207][ T7278] [ 49.889535][ T7278] write to 0xffff88812120c138 of 8 bytes by interrupt on cpu 0: [ 49.897303][ T7278] tcp_add_backlog+0x45a/0xcc0 [ 49.902075][ T7278] tcp_v4_rcv+0x1aba/0x1bf0 [ 49.906570][ T7278] ip_protocol_deliver_rcu+0x51/0x470 [ 49.912349][ T7278] ip_local_deliver_finish+0x110/0x140 [ 49.918568][ T7278] ip_local_deliver+0x133/0x210 [ 49.923419][ T7278] ip_rcv_finish+0x121/0x160 [ 49.928117][ T7278] ip_rcv+0x18f/0x1a0 [ 49.932271][ T7278] __netif_receive_skb_one_core+0xa7/0xe0 [ 49.938161][ T7278] __netif_receive_skb+0x37/0xf0 [ 49.943252][ T7278] netif_receive_skb_internal+0x59/0x190 [ 49.948915][ T7278] napi_gro_receive+0x28f/0x330 [ 49.954186][ T7278] receive_buf+0x284/0x30b0 [ 49.958675][ T7278] virtnet_poll+0x436/0x7d0 [ 49.963156][ T7278] net_rx_action+0x3ae/0xa50 [ 49.967722][ T7278] [ 49.970049][ T7278] read to 0xffff88812120c138 of 8 bytes by task 7278 on cpu 1: [ 49.977596][ T7278] tcp_recvmsg+0x470/0x1a30 [ 49.982080][ T7278] inet_recvmsg+0xbb/0x250 [ 49.986489][ T7278] sock_recvmsg+0x92/0xb0 [ 49.990848][ T7278] sock_read_iter+0x15f/0x1e0 [ 49.995562][ T7278] new_sync_read+0x389/0x4f0 [ 50.000336][ T7278] __vfs_read+0xb1/0xc0 [ 50.004479][ T7278] vfs_read+0x143/0x2c0 [ 50.008995][ T7278] ksys_read+0xd5/0x1b0 [ 50.013144][ T7278] __x64_sys_read+0x4c/0x60 [ 50.017650][ T7278] do_syscall_64+0xcf/0x2f0 [ 50.022148][ T7278] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 50.028237][ T7278] [ 50.030548][ T7278] Reported by Kernel Concurrency Sanitizer on: [ 50.036879][ T7278] CPU: 1 PID: 7278 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 50.043966][ T7278] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.054304][ T7278] ================================================================== [ 50.062535][ T7278] Kernel panic - not syncing: panic_on_warn set ... [ 50.069110][ T7278] CPU: 1 PID: 7278 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 50.076385][ T7278] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.086732][ T7278] Call Trace: [ 50.090042][ T7278] dump_stack+0xf5/0x159 [ 50.094292][ T7278] panic+0x209/0x639 [ 50.098197][ T7278] ? vprintk_func+0x8d/0x140 [ 50.102845][ T7278] kcsan_report.cold+0x57/0xeb [ 50.108056][ T7278] __kcsan_setup_watchpoint+0x342/0x500 [ 50.113997][ T7278] __tsan_read8+0x2c/0x30 [ 50.118338][ T7278] tcp_recvmsg+0x470/0x1a30 [ 50.122992][ T7278] inet_recvmsg+0xbb/0x250 [ 50.127409][ T7278] ? __tsan_read8+0x2c/0x30 [ 50.131984][ T7278] ? inet_sendpage+0x100/0x100 [ 50.136764][ T7278] sock_recvmsg+0x92/0xb0 [ 50.141073][ T7278] sock_read_iter+0x15f/0x1e0 [ 50.146298][ T7278] new_sync_read+0x389/0x4f0 [ 50.150876][ T7278] __vfs_read+0xb1/0xc0 [ 50.155102][ T7278] vfs_read+0x143/0x2c0 [ 50.159328][ T7278] ksys_read+0xd5/0x1b0 [ 50.163468][ T7278] __x64_sys_read+0x4c/0x60 [ 50.167957][ T7278] do_syscall_64+0xcf/0x2f0 [ 50.172466][ T7278] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 50.178358][ T7278] RIP: 0033:0x47c530 [ 50.182254][ T7278] 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 [ 50.201927][ T7278] RSP: 002b:000000c4204e97d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 50.210341][ T7278] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 50.218474][ T7278] RDX: 0000000000001000 RSI: 000000c420372000 RDI: 0000000000000003 [ 50.226437][ T7278] RBP: 000000c4204e9830 R08: 0000000000000000 R09: 0000000000000000 [ 50.234412][ T7278] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000008 [ 50.242382][ T7278] R13: ffffffffffffffff R14: 0000000000000010 R15: ffffffffffffffff [ 50.252212][ T7278] Kernel Offset: disabled [ 50.256541][ T7278] Rebooting in 86400 seconds..