[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.396328] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.568529] random: sshd: uninitialized urandom read (32 bytes read) [ 19.779922] random: sshd: uninitialized urandom read (32 bytes read) [ 20.602376] random: sshd: uninitialized urandom read (32 bytes read) [ 39.749749] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.6' (ECDSA) to the list of known hosts. [ 45.233844] random: sshd: uninitialized urandom read (32 bytes read) 2018/04/26 01:15:12 parsed 1 programs 2018/04/26 01:15:12 executed programs: 0 [ 45.648950] IPVS: Creating netns size=2536 id=1 [ 45.680377] IPVS: Creating netns size=2536 id=2 [ 45.713849] IPVS: Creating netns size=2536 id=3 [ 45.749079] IPVS: Creating netns size=2536 id=4 [ 45.787280] IPVS: Creating netns size=2536 id=5 [ 45.802307] IPVS: Creating netns size=2536 id=6 [ 45.843188] IPVS: Creating netns size=2536 id=7 [ 45.879416] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 45.886857] IPVS: Creating netns size=2536 id=8 [ 45.908240] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 46.037535] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 46.051874] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 46.068648] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 46.103404] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 46.116644] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 46.137125] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 46.211201] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 46.236180] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 46.262980] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 46.271300] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 46.283989] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 46.297949] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 46.305581] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 46.326805] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 46.365126] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 46.374001] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 46.385116] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 46.396058] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 46.404930] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 46.421398] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 46.428838] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 46.437575] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 46.446937] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 46.467060] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 46.481088] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 46.493472] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 46.526731] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 46.543794] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 46.563011] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 46.573088] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 46.593050] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 46.604531] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 46.617759] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 46.627809] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 46.636991] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 46.648532] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 46.656712] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 46.667864] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 46.675580] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 46.683364] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 46.694299] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 46.702981] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 46.710130] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 46.718215] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 46.733849] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 46.748387] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 46.866077] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 46.877342] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 46.887382] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 46.894861] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 46.905566] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 46.916155] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 46.924566] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 46.935776] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 46.944937] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 46.954659] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 46.963402] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 46.970891] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 46.978286] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 46.985800] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 46.993629] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 47.001107] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 47.008481] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 47.017502] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 47.025952] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 47.034776] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 47.045461] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 47.053207] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 47.060633] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 47.069180] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 47.076618] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 47.084086] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 47.091524] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 47.098976] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 47.106417] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 47.116878] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 47.127433] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 47.136065] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 49.131448] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 49.262439] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 49.268709] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 49.277946] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 49.299224] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 49.336011] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 49.354834] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 49.441683] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 49.447838] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 49.461018] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 49.470698] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 49.484684] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 49.495267] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 49.519844] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 49.536348] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 49.545412] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 49.590584] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 49.609927] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 49.624910] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 49.718250] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 49.728882] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 49.736893] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 49.748587] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 49.755897] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 49.764808] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 49.774847] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 49.784182] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 49.790888] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 49.797488] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 49.893309] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 49.899480] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 49.906637] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 55.102801] ------------[ cut here ]------------ [ 55.107703] WARNING: CPU: 0 PID: 6668 at net/ipv4/tcp_input.c:1992 tcp_enter_loss+0xe92/0x1180 [ 55.116458] Kernel panic - not syncing: panic_on_warn set ... [ 55.116458] [ 55.123808] CPU: 0 PID: 6668 Comm: syz-executor0 Not tainted 4.9.96-g8c01d00 #11 [ 55.131323] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.140658] ffff8801c951f9a0 ffffffff81eb0b69 ffffffff83a484a0 00000000ffffffff [ 55.148678] 0000000000000000 0000000000000000 00000000000007c8 ffff8801c951fa60 [ 55.156702] ffffffff8141f975 0000000041b58ab3 ffffffff841b8030 ffffffff8141f7b6 [ 55.164722] Call Trace: [ 55.167294] [] dump_stack+0xc1/0x128 [ 55.172640] [] panic+0x1bf/0x3bc [ 55.177641] [] ? add_taint.cold.6+0x16/0x16 [ 55.183594] [] ? __warn.cold.9+0xa6/0x17f [ 55.189376] [] ? tcp_enter_loss+0xe92/0x1180 [ 55.195417] [] __warn.cold.9+0xc1/0x17f [ 55.201026] [] warn_slowpath_null+0x2c/0x40 [ 55.206981] [] tcp_enter_loss+0xe92/0x1180 [ 55.212849] [] tcp_retransmit_timer+0x8e2/0x2290 [ 55.219239] [] ? release_sock+0x20/0x1c0 [ 55.224932] [] tcp_write_timer_handler+0x1f1/0x7a0 [ 55.231493] [] tcp_release_cb+0x1b6/0x230 [ 55.237269] [] ? tcp_tsq_handler+0x250/0x250 [ 55.243307] [] release_sock+0xbe/0x1c0 [ 55.248827] [] do_tcp_setsockopt.isra.40+0x261/0x1d30 [ 55.255649] [] ? tcp_peek_len+0x250/0x250 [ 55.261429] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 55.268513] [] ? selinux_netlbl_socket_setsockopt+0x8c/0x340 [ 55.275942] [] ? selinux_netlbl_sock_rcv_skb+0x480/0x480 [ 55.283024] [] compat_tcp_setsockopt+0x67/0x70 [ 55.289238] [] compat_sock_common_setsockopt+0xb4/0x150 [ 55.296233] [] ? tcp_setsockopt+0xe0/0xe0 [ 55.302017] [] compat_SyS_setsockopt+0x14c/0x2a0 [ 55.308403] [] ? sock_common_setsockopt+0xe0/0xe0 [ 55.314880] [] ? scm_detach_fds_compat+0x3b0/0x3b0 [ 55.321440] [] ? do_fast_syscall_32+0xcf/0x870 [ 55.327652] [] ? scm_detach_fds_compat+0x3b0/0x3b0 [ 55.334215] [] do_fast_syscall_32+0x2f7/0x870 [ 55.340342] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 55.346990] [] entry_SYSENTER_compat+0x90/0xa2 [ 55.353780] Dumping ftrace buffer: [ 55.357326] (ftrace buffer empty) [ 55.361008] Kernel Offset: disabled [ 55.364613] Rebooting in 86400 seconds..