[ 16.746939] 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: [ 21.165753] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.582866] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.383345] random: sshd: uninitialized urandom read (32 bytes read, 96 bits of entropy available) [ 22.747865] random: sshd: uninitialized urandom read (32 bytes read, 100 bits of entropy available) Warning: Permanently added '10.128.0.27' (ECDSA) to the list of known hosts. [ 28.128492] random: sshd: uninitialized urandom read (32 bytes read, 108 bits of entropy available) executing program [ 28.236721] device syz0 entered promiscuous mode [ 28.279959] ------------[ cut here ]------------ [ 28.284763] WARNING: CPU: 0 PID: 3318 at net/core/dev.c:2449 skb_warn_bad_offload+0x2af/0x390() [ 28.293618] syz0: caps=(0x00000080000048c1, 0x0000000000000000) len=56 data_len=0 gso_size=3 gso_type=20 ip_summed=0 [ 28.304413] Kernel panic - not syncing: panic_on_warn set ... [ 28.304413] [ 28.311768] CPU: 0 PID: 3318 Comm: syzkaller822232 Not tainted 4.4.110-gdac1439 #13 [ 28.319541] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.328877] 0000000000000000 59af788947571060 ffff8800b51b73b0 ffffffff81d04e3d [ 28.336876] ffffffff83842f60 ffff8800b51b7488 ffffffff83ca9d60 0000000000000009 [ 28.344872] 0000000000000991 ffff8800b51b7478 ffffffff814197fa 0000000041b58ab3 [ 28.352833] Call Trace: [ 28.355390] [] dump_stack+0xc1/0x124 [ 28.360723] [] panic+0x1aa/0x388 [ 28.365714] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 28.372607] [] ? warn_slowpath_common+0x10a/0x140 [ 28.379068] [] warn_slowpath_common+0x125/0x140 [ 28.385355] [] ? skb_warn_bad_offload+0x2af/0x390 [ 28.391817] [] warn_slowpath_fmt+0xc1/0x110 [ 28.397754] [] ? warn_slowpath_common+0x140/0x140 [ 28.404212] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 28.411104] [] ? ___ratelimit+0x53/0x3e0 [ 28.416789] [] skb_warn_bad_offload+0x2af/0x390 [ 28.423074] [] __skb_gso_segment+0x3b3/0x4a0 [ 28.429108] [] validate_xmit_skb.isra.100.part.101+0x44e/0x970 [ 28.436703] [] validate_xmit_skb_list+0xae/0x110 [ 28.443076] [] sch_direct_xmit+0x34f/0x760 [ 28.448925] [] ? dev_deactivate_queue.constprop.34+0x150/0x150 [ 28.456512] [] __dev_queue_xmit+0x1368/0x1a70 [ 28.462625] [] ? __dev_queue_xmit+0x1a6/0x1a70 [ 28.468831] [] ? netdev_pick_tx+0x310/0x310 [ 28.474769] [] ? tun_select_queue+0x1c8/0x380 [ 28.480878] [] ? tun_chr_ioctl+0x40/0x40 [ 28.486553] [] ? tun_chr_ioctl+0x40/0x40 [ 28.492237] [] dev_queue_xmit+0x17/0x20 [ 28.497846] [] packet_sendmsg+0x29b2/0x47e0 [ 28.503795] [] ? avc_has_perm_noaudit+0x460/0x460 [ 28.510262] [] ? packet_cached_dev_get+0x200/0x200 [ 28.516814] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 28.523882] [] ? save_stack+0x43/0xd0 [ 28.529299] [] ? kasan_kmalloc+0x82/0xe0 [ 28.534977] [] ? kmem_cache_alloc+0xba/0x290 [ 28.541001] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 28.547458] [] ? security_socket_sendmsg+0x89/0xb0 [ 28.554004] [] ? packet_cached_dev_get+0x200/0x200 [ 28.560548] [] sock_sendmsg+0xca/0x110 [ 28.566050] [] sock_write_iter+0x226/0x3b0 [ 28.571900] [] ? avc_has_perm_noaudit+0x460/0x460 [ 28.578355] [] ? sock_sendmsg+0x110/0x110 [ 28.584119] [] ? iov_iter_init+0xaf/0x1d0 [ 28.589885] [] __vfs_write+0x33c/0x450 [ 28.595385] [] ? __vfs_read+0x440/0x440 [ 28.600983] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.606920] [] ? selinux_file_permission+0x348/0x460 [ 28.613648] [] ? rw_verify_area+0x100/0x2f0 [ 28.619602] [] vfs_write+0x18a/0x530 [ 28.624939] [] SyS_write+0xd9/0x1b0 [ 28.630180] [] ? SyS_read+0x1b0/0x1b0 [ 28.635604] [] ? do_fast_syscall_32+0xd7/0x890 [ 28.641807] [] ? SyS_read+0x1b0/0x1b0 [ 28.647221] [] do_fast_syscall_32+0x314/0x890 [ 28.653333] [] sysenter_flags_fixed+0xd/0x17 [ 28.659483] Dumping ftrace buffer: [ 28.663036] (ftrace buffer empty) [ 28.666711] Kernel Offset: disabled [ 28.670319] Rebooting in 86400 seconds..