[ 18.473998] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.936681] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.177785] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.994195] random: sshd: uninitialized urandom read (32 bytes read, 108 bits of entropy available) [ 22.141719] random: sshd: uninitialized urandom read (32 bytes read, 112 bits of entropy available) Warning: Permanently added '10.128.0.7' (ECDSA) to the list of known hosts. [ 27.553242] random: sshd: uninitialized urandom read (32 bytes read, 118 bits of entropy available) net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: File exists RTNETLINK answers: File exists RTNETLINK answers: Operation not supported Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" RTNETLINK answers: Operation not supported Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "bond0" Cannot find device "bond0" Cannot find device "bond0" Cannot find device "bond0" Cannot find device "veth0" Cannot find device "veth0" Cannot find device "veth0" Cannot find device "veth0" Cannot find device "veth1" Cannot find device "veth1" Cannot find device "veth1" Cannot find device "veth1" executing program [ 28.727287] ------------[ cut here ]------------ [ 28.732095] WARNING: CPU: 1 PID: 3786 at net/core/dev.c:2449 skb_warn_bad_offload+0x2af/0x390() [ 28.740928] syz0: caps=(0x00000080000048c1, 0x0000000000000000) len=90 data_len=0 gso_size=574 gso_type=5 ip_summed=0 [ 28.751664] Kernel panic - not syncing: panic_on_warn set ... [ 28.751664] [ 28.758997] CPU: 1 PID: 3786 Comm: syzkaller032523 Not tainted 4.4.116-g17c7c49 #18 [ 28.766757] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.776078] 0000000000000000 c46df76e215578c8 ffff8800bb3973d8 ffffffff81d03f6d [ 28.784037] ffffffff83843a40 ffff8800bb3974b0 ffffffff83caac20 0000000000000009 [ 28.792002] 0000000000000991 ffff8800bb3974a0 ffffffff8141acaa 0000000041b58ab3 [ 28.799966] Call Trace: [ 28.802524] [] dump_stack+0xc1/0x124 [ 28.807855] [] panic+0x1aa/0x388 [ 28.812839] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 28.819733] [] ? warn_slowpath_common+0x10a/0x140 [ 28.826193] [] warn_slowpath_common+0x125/0x140 [ 28.832480] [] ? skb_warn_bad_offload+0x2af/0x390 [ 28.838944] [] warn_slowpath_fmt+0xc1/0x110 [ 28.844882] [] ? warn_slowpath_common+0x140/0x140 [ 28.851341] [] ? ___ratelimit+0x212/0x3e0 [ 28.857108] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 28.864003] [] ? ___ratelimit+0x53/0x3e0 [ 28.869682] [] skb_warn_bad_offload+0x2af/0x390 [ 28.875967] [] __skb_gso_segment+0x3b3/0x4a0 [ 28.882003] [] validate_xmit_skb.isra.101.part.102+0x44e/0x970 [ 28.889588] [] validate_xmit_skb_list+0xae/0x110 [ 28.895964] [] sch_direct_xmit+0x34f/0x760 [ 28.901827] [] ? dev_deactivate_queue.constprop.34+0x150/0x150 [ 28.909412] [] ? __dev_queue_xmit+0x1d5/0x1cc0 [ 28.915609] [] __dev_queue_xmit+0x148e/0x1cc0 [ 28.921726] [] ? __dev_queue_xmit+0x1d5/0x1cc0 [ 28.927924] [] ? netdev_pick_tx+0x310/0x310 [ 28.933866] [] ? tun_select_queue+0x1a1/0x380 [ 28.939976] [] ? tun_select_queue+0x1c8/0x380 [ 28.946089] [] ? tun_chr_ioctl+0x40/0x40 [ 28.951775] [] ? tun_chr_ioctl+0x40/0x40 [ 28.957459] [] dev_queue_xmit+0x17/0x20 [ 28.963053] [] packet_sendmsg+0x29b2/0x47e0 [ 28.968994] [] ? avc_has_perm_noaudit+0x460/0x460 [ 28.975455] [] ? debug_check_no_locks_freed+0x251/0x2c0 [ 28.982435] [] ? packet_cached_dev_get+0x200/0x200 [ 28.988981] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 28.996053] [] ? avc_has_perm+0xb6/0x500 [ 29.001731] [] ? __might_fault+0xe4/0x1d0 [ 29.007494] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 29.013954] [] ? security_socket_sendmsg+0x89/0xb0 [ 29.020506] [] ? packet_cached_dev_get+0x200/0x200 [ 29.027053] [] sock_sendmsg+0xca/0x110 [ 29.032557] [] SYSC_sendto+0x2c8/0x340 [ 29.038060] [] ? SYSC_connect+0x310/0x310 [ 29.043826] [] ? packet_poll+0x5c0/0x5c0 [ 29.049503] [] ? sock_has_perm+0x29f/0x400 [ 29.055356] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 29.062424] [] ? selinux_netlbl_sock_rcv_skb+0x400/0x400 [ 29.069491] [] ? security_socket_setsockopt+0x89/0xb0 [ 29.076299] [] ? fput+0x20/0x150 [ 29.081282] [] ? compat_SyS_setsockopt+0x18a/0x290 [ 29.087828] [] ? scm_detach_fds_compat+0x3c0/0x3c0 [ 29.094375] [] SyS_sendto+0x40/0x50 [ 29.099620] [] ? SyS_getpeername+0x30/0x30 [ 29.105471] [] do_fast_syscall_32+0x314/0x890 [ 29.111590] [] sysenter_flags_fixed+0xd/0x17 [ 29.118072] Dumping ftrace buffer: [ 29.121583] (ftrace buffer empty) [ 29.125260] Kernel Offset: disabled [ 29.128855] Rebooting in 86400 seconds..