[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.906300] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.364912] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 20.563091] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.477577] random: sshd: uninitialized urandom read (32 bytes read, 113 bits of entropy available) [ 21.664734] random: sshd: uninitialized urandom read (32 bytes read, 119 bits of entropy available) Warning: Permanently added '10.128.0.27' (ECDSA) to the list of known hosts. [ 27.056772] random: sshd: uninitialized urandom read (32 bytes read, 126 bits of entropy available) executing program [ 27.195682] device syz0 entered promiscuous mode [ 27.229157] ------------[ cut here ]------------ [ 27.233938] WARNING: CPU: 1 PID: 3323 at net/core/dev.c:2449 skb_warn_bad_offload+0x2af/0x390() [ 27.242874] syz0: caps=(0x00000080000048c1, 0x0000000000000000) len=28 data_len=0 gso_size=63464 gso_type=13 ip_summed=0 [ 27.254005] Kernel panic - not syncing: panic_on_warn set ... [ 27.254005] [ 27.261353] CPU: 1 PID: 3323 Comm: syzkaller922169 Not tainted 4.4.111-gf851888 #23 [ 27.269119] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.278451] 0000000000000000 41fa6bf4d479cda2 ffff8800b52d7428 ffffffff81d0507d [ 27.286438] ffffffff83842f60 ffff8800b52d7500 ffffffff83ca9e60 0000000000000009 [ 27.294421] 0000000000000991 ffff8800b52d74f0 ffffffff81419a3a 0000000041b58ab3 [ 27.302413] Call Trace: [ 27.304983] [] dump_stack+0xc1/0x124 [ 27.310329] [] panic+0x1aa/0x388 [ 27.315323] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 27.322218] [] ? warn_slowpath_common+0x10a/0x140 [ 27.328683] [] warn_slowpath_common+0x125/0x140 [ 27.334978] [] ? skb_warn_bad_offload+0x2af/0x390 [ 27.341441] [] warn_slowpath_fmt+0xc1/0x110 [ 27.347387] [] ? warn_slowpath_common+0x140/0x140 [ 27.353856] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 27.360758] [] ? ___ratelimit+0x53/0x3e0 [ 27.366432] [] skb_warn_bad_offload+0x2af/0x390 [ 27.372722] [] __skb_gso_segment+0x3b3/0x4a0 [ 27.378745] [] validate_xmit_skb.isra.100.part.101+0x44e/0x970 [ 27.386327] [] validate_xmit_skb_list+0xae/0x110 [ 27.392695] [] sch_direct_xmit+0x34f/0x760 [ 27.398546] [] ? dev_deactivate_queue.constprop.34+0x150/0x150 [ 27.406135] [] __dev_queue_xmit+0x1368/0x1a70 [ 27.412243] [] ? __dev_queue_xmit+0x1a6/0x1a70 [ 27.418483] [] ? netdev_pick_tx+0x310/0x310 [ 27.424421] [] ? tun_select_queue+0x1c8/0x380 [ 27.430527] [] ? tun_chr_ioctl+0x40/0x40 [ 27.436203] [] ? tun_chr_ioctl+0x40/0x40 [ 27.441878] [] dev_queue_xmit+0x17/0x20 [ 27.447467] [] packet_sendmsg+0x29b2/0x47e0 [ 27.453499] [] ? avc_has_perm_noaudit+0x460/0x460 [ 27.459960] [] ? packet_cached_dev_get+0x200/0x200 [ 27.466515] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 27.473586] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 27.480045] [] ? security_socket_sendmsg+0x89/0xb0 [ 27.486598] [] ? packet_cached_dev_get+0x200/0x200 [ 27.493141] [] sock_sendmsg+0xca/0x110 [ 27.498641] [] sock_write_iter+0x226/0x3b0 [ 27.504491] [] ? avc_has_perm_noaudit+0x460/0x460 [ 27.510951] [] ? sock_sendmsg+0x110/0x110 [ 27.517328] [] ? iov_iter_init+0xaf/0x1d0 [ 27.523090] [] __vfs_write+0x33c/0x450 [ 27.528591] [] ? __vfs_read+0x440/0x440 [ 27.534195] [] ? handle_mm_fault+0x3f2/0x3190 [ 27.540308] [] ? selinux_file_permission+0x348/0x460 [ 27.547027] [] ? rw_verify_area+0x100/0x2f0 [ 27.552968] [] vfs_write+0x18a/0x530 [ 27.558295] [] SyS_write+0xd9/0x1b0 [ 27.563538] [] ? SyS_read+0x1b0/0x1b0 [ 27.568953] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 27.575498] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 27.582665] Dumping ftrace buffer: [ 27.586216] (ftrace buffer empty) [ 27.589907] Kernel Offset: disabled [ 27.593516] Rebooting in 86400 seconds..