[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.798734] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.656857] random: sshd: uninitialized urandom read (32 bytes read) [ 17.945709] random: sshd: uninitialized urandom read (32 bytes read) [ 18.706130] random: sshd: uninitialized urandom read (32 bytes read) [ 18.835921] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.56' (ECDSA) to the list of known hosts. [ 29.389144] random: sshd: uninitialized urandom read (32 bytes read) 2018/04/30 06:26:50 parsed 1 programs 2018/04/30 06:26:50 executed programs: 0 [ 29.837293] IPVS: Creating netns size=2536 id=1 [ 29.871211] IPVS: Creating netns size=2536 id=2 [ 29.902128] IPVS: Creating netns size=2536 id=3 [ 29.944686] IPVS: Creating netns size=2536 id=4 [ 29.970246] IPVS: Creating netns size=2536 id=5 [ 30.021793] IPVS: Creating netns size=2536 id=6 [ 30.071004] IPVS: Creating netns size=2536 id=7 [ 30.091894] IPVS: Creating netns size=2536 id=8 [ 30.217396] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 30.235106] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 30.249520] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 30.259057] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 30.325649] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 30.351551] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 30.360928] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 30.369605] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 30.381910] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 30.390184] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 30.404664] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 30.417552] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 30.470903] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 30.496874] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 30.518234] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 30.527280] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 30.539420] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 30.550234] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 30.557167] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 30.566889] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 30.574439] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 30.581948] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 30.616054] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 30.626246] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 30.633916] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 30.645800] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 30.653473] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 30.661174] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 30.676349] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 30.686522] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 30.695409] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 30.707652] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 30.716176] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 30.724439] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 30.735761] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 30.751918] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 30.759084] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 30.784223] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 30.797247] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 30.805361] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 30.820685] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 30.828654] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 30.837019] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 30.854124] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 30.867020] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 30.881719] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 30.891828] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 30.900260] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 30.908188] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 30.916235] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 30.939738] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 30.947054] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 30.968673] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 30.983743] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 30.992965] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 31.007454] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 31.021920] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 31.036968] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 31.048458] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 31.057454] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 31.074061] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 31.087273] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 31.101551] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 31.113003] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 32.022720] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 32.037465] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 32.084164] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 32.097300] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 32.138566] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 32.146594] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 32.155381] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 32.173849] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 32.185885] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 32.195282] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 32.211268] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 32.218660] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 32.226760] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 32.270544] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 32.276965] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 32.285254] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 32.293622] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 32.302583] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 32.372267] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 32.418364] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 32.428657] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 32.436947] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 32.446146] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 32.453165] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 32.461688] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 32.468479] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 32.527794] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 32.535617] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 32.544281] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 32.595316] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 32.606600] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 32.613691] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 33.146488] ------------[ cut here ]------------ [ 33.151320] WARNING: CPU: 0 PID: 5857 at net/core/dev.c:2473 skb_warn_bad_offload+0x2af/0x380 [ 33.159999] veth0: caps=(0x00000c229fbb59e9, 0x0000000000000000) len=65521 data_len=65431 gso_size=49152 gso_type=5 ip_summed=0 [ 33.171894] Kernel panic - not syncing: panic_on_warn set ... [ 33.171894] [ 33.179257] CPU: 0 PID: 5857 Comm: syz-executor0 Not tainted 4.9.96-g71fce1e #13 [ 33.186784] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.196133] ffff8801d98a7488 ffffffff81eb0b69 ffffffff83a484a0 00000000ffffffff [ 33.204187] 0000000000000000 0000000000000000 00000000000009a9 ffff8801d98a7548 [ 33.212223] ffffffff8141f975 0000000041b58ab3 ffffffff841b8030 ffffffff8141f7b6 [ 33.220255] Call Trace: [ 33.222842] [] dump_stack+0xc1/0x128 [ 33.228200] [] panic+0x1bf/0x3bc [ 33.233231] [] ? add_taint.cold.6+0x16/0x16 [ 33.239198] [] ? __warn.cold.9+0xa6/0x17f [ 33.245252] [] ? skb_warn_bad_offload+0x2af/0x380 [ 33.251737] [] __warn.cold.9+0xc1/0x17f [ 33.257357] [] warn_slowpath_fmt+0xc2/0x100 [ 33.263324] [] ? __warn+0x50/0x50 [ 33.268427] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 33.275349] [] ? ___ratelimit+0x53/0x401 [ 33.281058] [] skb_warn_bad_offload+0x2af/0x380 [ 33.287375] [] __skb_gso_segment+0x546/0x680 [ 33.293604] [] validate_xmit_skb+0x48e/0xab0 [ 33.299658] [] ? check_preemption_disabled+0x3b/0x170 [ 33.306491] [] ? check_preemption_disabled+0x3b/0x170 [ 33.313326] [] __dev_queue_xmit+0x888/0x2080 [ 33.319379] [] ? __dev_queue_xmit+0x1e2/0x2080 [ 33.325610] [] ? netdev_pick_tx+0x2c0/0x2c0 [ 33.331569] [] ? __check_object_size+0x248/0x38e [ 33.337953] [] ? copy_page_from_iter+0x3df/0x610 [ 33.344330] [] dev_queue_xmit+0x17/0x20 [ 33.349930] [] packet_sendmsg+0x1f17/0x44e0 [ 33.355876] [] ? packet_cached_dev_get+0x1f0/0x1f0 [ 33.362432] [] ? sock_has_perm+0x292/0x3e0 [ 33.368293] [] ? sock_has_perm+0x9f/0x3e0 [ 33.374075] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 33.381161] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 33.387636] [] ? security_socket_sendmsg+0x8f/0xc0 [ 33.394367] [] ? packet_cached_dev_get+0x1f0/0x1f0 [ 33.400920] [] sock_sendmsg+0xcc/0x110 [ 33.406440] [] SYSC_sendto+0x21c/0x370 [ 33.411948] [] ? SYSC_connect+0x300/0x300 [ 33.417723] [] ? sock_has_perm+0x292/0x3e0 [ 33.423584] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 33.430656] [] ? selinux_netlbl_socket_setsockopt+0x8c/0x340 [ 33.438075] [] ? selinux_netlbl_sock_rcv_skb+0x480/0x480 [ 33.445155] [] ? compat_SyS_futex+0x1e1/0x2f0 [ 33.451278] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 33.458264] [] ? compat_SyS_setsockopt+0x18d/0x2a0 [ 33.464822] [] ? packet_setsockopt+0x2350/0x2350 [ 33.471204] [] ? scm_detach_fds_compat+0x3b0/0x3b0 [ 33.477779] [] SyS_sendto+0x40/0x50 [ 33.483030] [] ? SyS_getpeername+0x30/0x30 [ 33.488895] [] do_fast_syscall_32+0x2f7/0x870 [ 33.495018] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.501662] [] entry_SYSENTER_compat+0x90/0xa2 [ 33.508476] Dumping ftrace buffer: [ 33.512035] (ftrace buffer empty) [ 33.515715] Kernel Offset: disabled [ 33.519318] Rebooting in 86400 seconds..