[ 16.437577] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.751729] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.183891] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 23.055913] random: sshd: uninitialized urandom read (32 bytes read, 100 bits of entropy available) [ 23.233773] random: sshd: uninitialized urandom read (32 bytes read, 106 bits of entropy available) Warning: Permanently added '10.128.15.200' (ECDSA) to the list of known hosts. [ 28.629987] random: sshd: uninitialized urandom read (32 bytes read, 116 bits of entropy available) executing program [ 28.724907] device syz0 entered promiscuous mode [ 28.753347] ------------[ cut here ]------------ [ 28.758145] WARNING: CPU: 0 PID: 3324 at net/core/dev.c:2449 skb_warn_bad_offload+0x2af/0x390() [ 28.766996] syz0: caps=(0x00000080000048c1, 0x0000000000000000) len=28 data_len=0 gso_size=63464 gso_type=13 ip_summed=0 [ 28.778066] Kernel panic - not syncing: panic_on_warn set ... [ 28.778066] [ 28.785398] CPU: 0 PID: 3324 Comm: syzkaller497950 Not tainted 4.4.111-gf851888 #16 [ 28.793156] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.802488] 0000000000000000 2e5afa97b44b3c89 ffff8801d1cdf3b0 ffffffff81d0507d [ 28.810440] ffffffff83842f60 ffff8801d1cdf488 ffffffff83ca9e60 0000000000000009 [ 28.818402] 0000000000000991 ffff8801d1cdf478 ffffffff81419a3a 0000000041b58ab3 [ 28.826383] Call Trace: [ 28.828944] [] dump_stack+0xc1/0x124 [ 28.834290] [] panic+0x1aa/0x388 [ 28.839276] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 28.846179] [] ? warn_slowpath_common+0x10a/0x140 [ 28.852636] [] warn_slowpath_common+0x125/0x140 [ 28.858930] [] ? skb_warn_bad_offload+0x2af/0x390 [ 28.865395] [] warn_slowpath_fmt+0xc1/0x110 [ 28.871332] [] ? warn_slowpath_common+0x140/0x140 [ 28.877796] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 28.884689] [] ? ___ratelimit+0x53/0x3e0 [ 28.890367] [] skb_warn_bad_offload+0x2af/0x390 [ 28.896660] [] __skb_gso_segment+0x3b3/0x4a0 [ 28.902687] [] validate_xmit_skb.isra.100.part.101+0x44e/0x970 [ 28.910277] [] validate_xmit_skb_list+0xae/0x110 [ 28.916651] [] sch_direct_xmit+0x34f/0x760 [ 28.922503] [] ? dev_deactivate_queue.constprop.34+0x150/0x150 [ 28.930095] [] __dev_queue_xmit+0x1368/0x1a70 [ 28.936221] [] ? __dev_queue_xmit+0x1a6/0x1a70 [ 28.942420] [] ? netdev_pick_tx+0x310/0x310 [ 28.948359] [] ? tun_select_queue+0x1c8/0x380 [ 28.954470] [] ? tun_chr_ioctl+0x40/0x40 [ 28.960145] [] ? tun_chr_ioctl+0x40/0x40 [ 28.965823] [] dev_queue_xmit+0x17/0x20 [ 28.971421] [] packet_sendmsg+0x29b2/0x47e0 [ 28.977360] [] ? avc_has_perm_noaudit+0x460/0x460 [ 28.983830] [] ? packet_cached_dev_get+0x200/0x200 [ 28.990378] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 28.997454] [] ? save_stack+0x43/0xd0 [ 29.002881] [] ? kasan_kmalloc+0x42/0xe0 [ 29.008556] [] ? kmem_cache_alloc+0xba/0x290 [ 29.014581] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 29.021048] [] ? security_socket_sendmsg+0x89/0xb0 [ 29.027593] [] ? packet_cached_dev_get+0x200/0x200 [ 29.034141] [] sock_sendmsg+0xca/0x110 [ 29.039730] [] sock_write_iter+0x226/0x3b0 [ 29.045584] [] ? avc_has_perm_noaudit+0x460/0x460 [ 29.052040] [] ? sock_sendmsg+0x110/0x110 [ 29.057810] [] ? iov_iter_init+0xaf/0x1d0 [ 29.063580] [] __vfs_write+0x33c/0x450 [ 29.069088] [] ? __vfs_read+0x440/0x440 [ 29.074683] [] ? _raw_spin_unlock+0x2c/0x50 [ 29.080619] [] ? selinux_file_permission+0x348/0x460 [ 29.087339] [] ? rw_verify_area+0x100/0x2f0 [ 29.093278] [] vfs_write+0x18a/0x530 [ 29.098608] [] SyS_write+0xd9/0x1b0 [ 29.103850] [] ? SyS_read+0x1b0/0x1b0 [ 29.109268] [] ? do_fast_syscall_32+0xd7/0x890 [ 29.115466] [] ? SyS_read+0x1b0/0x1b0 [ 29.120890] [] do_fast_syscall_32+0x314/0x890 [ 29.127007] [] sysenter_flags_fixed+0xd/0x17 [ 29.133160] Dumping ftrace buffer: [ 29.136709] (ftrace buffer empty) [ 29.140387] Kernel Offset: disabled [ 29.143999] Rebooting in 86400 seconds..