[ 35.605002][ T26] audit: type=1800 audit(1570705361.555:24): pid=7166 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="sudo" dev="sda1" ino=2487 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.163883][ T26] audit: type=1800 audit(1570705362.185:25): pid=7166 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.183602][ T26] audit: type=1800 audit(1570705362.185:26): pid=7166 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 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 '10.128.0.67' (ECDSA) to the list of known hosts. 2019/10/10 11:02:51 fuzzer started 2019/10/10 11:02:53 dialing manager at 10.128.0.105:34287 2019/10/10 11:02:53 syscalls: 2523 2019/10/10 11:02:53 code coverage: enabled 2019/10/10 11:02:53 comparison tracing: enabled 2019/10/10 11:02:53 extra coverage: extra coverage is not supported by the kernel 2019/10/10 11:02:53 setuid sandbox: enabled 2019/10/10 11:02:53 namespace sandbox: enabled 2019/10/10 11:02:53 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/10 11:02:53 fault injection: enabled 2019/10/10 11:02:53 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/10 11:02:53 net packet injection: enabled 2019/10/10 11:02:53 net device setup: enabled 2019/10/10 11:02:53 concurrency sanitizer: enabled syzkaller login: [ 47.361629][ T7332] ================================================================== [ 47.369791][ T7332] BUG: KCSAN: data-race in tcp_add_backlog / tcp_rcv_space_adjust [ 47.377575][ T7332] [ 47.379886][ T7332] read to 0xffff888122d2d30c of 4 bytes by interrupt on cpu 0: [ 47.387413][ T7332] tcp_add_backlog+0x43/0xcc0 [ 47.392070][ T7332] tcp_v4_rcv+0x1aba/0x1bf0 [ 47.396566][ T7332] ip_protocol_deliver_rcu+0x51/0x470 [ 47.401927][ T7332] ip_local_deliver_finish+0x110/0x140 [ 47.407369][ T7332] ip_local_deliver+0x133/0x210 [ 47.412201][ T7332] ip_rcv_finish+0x121/0x160 [ 47.416805][ T7332] ip_rcv+0x18f/0x1a0 [ 47.420766][ T7332] __netif_receive_skb_one_core+0xa7/0xe0 [ 47.426461][ T7332] __netif_receive_skb+0x37/0xf0 [ 47.431376][ T7332] netif_receive_skb_internal+0x59/0x190 [ 47.436983][ T7332] napi_gro_receive+0x28f/0x330 [ 47.441810][ T7332] receive_buf+0x284/0x30b0 [ 47.446289][ T7332] virtnet_poll+0x436/0x7d0 [ 47.450909][ T7332] net_rx_action+0x3ae/0xa50 [ 47.455467][ T7332] [ 47.457775][ T7332] write to 0xffff888122d2d30c of 4 bytes by task 7332 on cpu 1: [ 47.465523][ T7332] tcp_rcv_space_adjust+0x40f/0x4c0 [ 47.470711][ T7332] tcp_recvmsg+0xdaa/0x1a30 [ 47.475227][ T7332] inet_recvmsg+0xbb/0x250 [ 47.479633][ T7332] sock_recvmsg+0x92/0xb0 [ 47.483988][ T7332] sock_read_iter+0x15f/0x1e0 [ 47.488697][ T7332] new_sync_read+0x389/0x4f0 [ 47.493268][ T7332] __vfs_read+0xb1/0xc0 [ 47.497403][ T7332] vfs_read+0x143/0x2c0 [ 47.501538][ T7332] ksys_read+0xd5/0x1b0 [ 47.505672][ T7332] __x64_sys_read+0x4c/0x60 [ 47.510154][ T7332] do_syscall_64+0xcf/0x2f0 [ 47.514638][ T7332] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 47.520501][ T7332] [ 47.522805][ T7332] Reported by Kernel Concurrency Sanitizer on: [ 47.528947][ T7332] CPU: 1 PID: 7332 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 47.536025][ T7332] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.546073][ T7332] ================================================================== [ 47.554122][ T7332] Kernel panic - not syncing: panic_on_warn set ... [ 47.560688][ T7332] CPU: 1 PID: 7332 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 47.567781][ T7332] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.577810][ T7332] Call Trace: [ 47.581082][ T7332] dump_stack+0xf5/0x159 [ 47.585305][ T7332] panic+0x209/0x639 [ 47.589208][ T7332] ? ksys_read+0xd5/0x1b0 [ 47.593517][ T7332] ? vprintk_func+0x8d/0x140 [ 47.598091][ T7332] kcsan_report.cold+0xc/0x1b [ 47.602768][ T7332] __kcsan_setup_watchpoint+0x3ee/0x510 [ 47.608293][ T7332] __tsan_write4+0x32/0x40 [ 47.612688][ T7332] tcp_rcv_space_adjust+0x40f/0x4c0 [ 47.617871][ T7332] tcp_recvmsg+0xdaa/0x1a30 [ 47.622355][ T7332] ? __kcsan_setup_watchpoint+0x96/0x510 [ 47.627968][ T7332] inet_recvmsg+0xbb/0x250 [ 47.632370][ T7332] ? __tsan_read8+0x2c/0x30 [ 47.636859][ T7332] ? inet_sendpage+0x100/0x100 [ 47.641598][ T7332] sock_recvmsg+0x92/0xb0 [ 47.645904][ T7332] sock_read_iter+0x15f/0x1e0 [ 47.650563][ T7332] new_sync_read+0x389/0x4f0 [ 47.655148][ T7332] __vfs_read+0xb1/0xc0 [ 47.659299][ T7332] vfs_read+0x143/0x2c0 [ 47.663434][ T7332] ksys_read+0xd5/0x1b0 [ 47.667584][ T7332] __x64_sys_read+0x4c/0x60 [ 47.672070][ T7332] do_syscall_64+0xcf/0x2f0 [ 47.676557][ T7332] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 47.682426][ T7332] RIP: 0033:0x47c530 [ 47.686303][ T7332] 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 [ 47.705886][ T7332] RSP: 002b:000000c4204f17d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 47.714274][ T7332] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 47.722222][ T7332] RDX: 0000000000001000 RSI: 000000c4203e0000 RDI: 0000000000000003 [ 47.730187][ T7332] RBP: 000000c4204f1830 R08: 0000000000000000 R09: 0000000000000000 [ 47.738136][ T7332] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000040 [ 47.746097][ T7332] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 47.755287][ T7332] Kernel Offset: disabled [ 47.759610][ T7332] Rebooting in 86400 seconds..