[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 41.718392][ T25] audit: type=1800 audit(1570192477.970:25): pid=7042 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 41.738038][ T25] audit: type=1800 audit(1570192477.970:26): pid=7042 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 41.758022][ T25] audit: type=1800 audit(1570192477.970:27): pid=7042 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 '10.128.10.2' (ECDSA) to the list of known hosts. 2019/10/04 12:34:48 fuzzer started 2019/10/04 12:34:50 dialing manager at 10.128.0.105:38119 2019/10/04 12:34:50 syscalls: 2523 2019/10/04 12:34:50 code coverage: enabled 2019/10/04 12:34:50 comparison tracing: enabled 2019/10/04 12:34:50 extra coverage: extra coverage is not supported by the kernel 2019/10/04 12:34:50 setuid sandbox: enabled 2019/10/04 12:34:50 namespace sandbox: enabled 2019/10/04 12:34:50 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/04 12:34:50 fault injection: enabled 2019/10/04 12:34:50 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/04 12:34:50 net packet injection: enabled 2019/10/04 12:34:50 net device setup: enabled 2019/10/04 12:34:50 concurrency sanitizer: enabled syzkaller login: [ 55.076966][ T7192] ================================================================== [ 55.085204][ T7192] BUG: KCSAN: data-race in tcp_add_backlog+0x45a/0xcc0 and tcp_recvmsg+0x470/0x1a30 [ 55.094550][ T7192] [ 55.096876][ T7192] write to 0xffff88811d80a9f8 of 8 bytes by interrupt on cpu 0: [ 55.104497][ T7192] tcp_add_backlog+0x45a/0xcc0 [ 55.109251][ T7192] tcp_v4_rcv+0x1aba/0x1bf0 [ 55.113744][ T7192] ip_protocol_deliver_rcu+0x51/0x470 [ 55.119091][ T7192] ip_local_deliver_finish+0x110/0x140 [ 55.124532][ T7192] ip_local_deliver+0x133/0x210 [ 55.129358][ T7192] ip_rcv_finish+0x121/0x160 [ 55.133925][ T7192] ip_rcv+0x18f/0x1a0 [ 55.137885][ T7192] __netif_receive_skb_one_core+0xa7/0xe0 [ 55.143590][ T7192] __netif_receive_skb+0x37/0xf0 [ 55.148511][ T7192] netif_receive_skb_internal+0x59/0x190 [ 55.154128][ T7192] napi_gro_receive+0x28f/0x330 [ 55.158964][ T7192] receive_buf+0x284/0x30b0 [ 55.163443][ T7192] virtnet_poll+0x436/0x7d0 [ 55.167917][ T7192] net_rx_action+0x3ae/0xa50 [ 55.172474][ T7192] [ 55.174803][ T7192] read to 0xffff88811d80a9f8 of 8 bytes by task 7192 on cpu 1: [ 55.182315][ T7192] tcp_recvmsg+0x470/0x1a30 [ 55.186798][ T7192] inet_recvmsg+0xbb/0x250 [ 55.191198][ T7192] sock_recvmsg+0x92/0xb0 [ 55.195500][ T7192] sock_read_iter+0x15f/0x1e0 [ 55.200151][ T7192] new_sync_read+0x389/0x4f0 [ 55.204711][ T7192] __vfs_read+0xb1/0xc0 [ 55.208842][ T7192] vfs_read+0x143/0x2c0 [ 55.212972][ T7192] ksys_read+0xd5/0x1b0 [ 55.217104][ T7192] __x64_sys_read+0x4c/0x60 [ 55.221594][ T7192] do_syscall_64+0xcf/0x2f0 [ 55.226074][ T7192] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 55.231931][ T7192] [ 55.234230][ T7192] Reported by Kernel Concurrency Sanitizer on: [ 55.240355][ T7192] CPU: 1 PID: 7192 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 55.247433][ T7192] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.257459][ T7192] ================================================================== [ 55.265503][ T7192] Kernel panic - not syncing: panic_on_warn set ... [ 55.272063][ T7192] CPU: 1 PID: 7192 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 55.279138][ T7192] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.289166][ T7192] Call Trace: [ 55.292434][ T7192] dump_stack+0xf5/0x159 [ 55.296655][ T7192] panic+0x209/0x639 [ 55.300527][ T7192] ? vprintk_func+0x8d/0x140 [ 55.305091][ T7192] kcsan_report.cold+0x57/0xeb [ 55.309830][ T7192] __kcsan_setup_watchpoint+0x342/0x500 [ 55.315352][ T7192] __tsan_read8+0x2c/0x30 [ 55.319658][ T7192] tcp_recvmsg+0x470/0x1a30 [ 55.324157][ T7192] inet_recvmsg+0xbb/0x250 [ 55.328545][ T7192] ? __tsan_read8+0x2c/0x30 [ 55.333026][ T7192] ? inet_sendpage+0x100/0x100 [ 55.337777][ T7192] sock_recvmsg+0x92/0xb0 [ 55.342080][ T7192] sock_read_iter+0x15f/0x1e0 [ 55.346739][ T7192] new_sync_read+0x389/0x4f0 [ 55.351309][ T7192] __vfs_read+0xb1/0xc0 [ 55.355441][ T7192] vfs_read+0x143/0x2c0 [ 55.359575][ T7192] ksys_read+0xd5/0x1b0 [ 55.363710][ T7192] __x64_sys_read+0x4c/0x60 [ 55.368191][ T7192] do_syscall_64+0xcf/0x2f0 [ 55.372671][ T7192] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 55.378539][ T7192] RIP: 0033:0x47c530 [ 55.382410][ T7192] 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 [ 55.401987][ T7192] RSP: 002b:000000c4204db7d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 55.410387][ T7192] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 55.418333][ T7192] RDX: 0000000000001000 RSI: 000000c4203e8000 RDI: 0000000000000003 [ 55.426277][ T7192] RBP: 000000c4204db830 R08: 0000000000000000 R09: 0000000000000000 [ 55.434221][ T7192] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000100 [ 55.442174][ T7192] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 55.451236][ T7192] Kernel Offset: disabled [ 55.455555][ T7192] Rebooting in 86400 seconds..