[ 16.837606] 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: [ 21.529606] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.974550] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 22.813452] random: sshd: uninitialized urandom read (32 bytes read, 90 bits of entropy available) [ 22.977691] random: sshd: uninitialized urandom read (32 bytes read, 94 bits of entropy available) Warning: Permanently added '10.128.0.53' (ECDSA) to the list of known hosts. [ 28.355095] random: sshd: uninitialized urandom read (32 bytes read, 101 bits of entropy available) executing program [ 28.461808] device syz0 entered promiscuous mode [ 28.481028] ------------[ cut here ]------------ [ 28.485832] WARNING: CPU: 1 PID: 3321 at net/core/dev.c:2449 skb_warn_bad_offload+0x2af/0x390() [ 28.494676] syz0: caps=(0x00000080000048c1, 0x0000000000000000) len=28 data_len=0 gso_size=8 gso_type=5 ip_summed=0 [ 28.505325] Kernel panic - not syncing: panic_on_warn set ... [ 28.505325] [ 28.512658] CPU: 1 PID: 3321 Comm: syzkaller199271 Not tainted 4.4.111-g7902639 #18 [ 28.520422] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.529759] 0000000000000000 cb276c7fc3b8099a ffff8801d05f73b0 ffffffff81d0509d [ 28.537753] ffffffff83842f60 ffff8801d05f7488 ffffffff83ca9d60 0000000000000009 [ 28.545721] 0000000000000991 ffff8801d05f7478 ffffffff81419a3a 0000000041b58ab3 [ 28.553701] Call Trace: [ 28.556261] [] dump_stack+0xc1/0x124 [ 28.561601] [] panic+0x1aa/0x388 [ 28.566762] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 28.573675] [] ? warn_slowpath_common+0x10a/0x140 [ 28.580139] [] warn_slowpath_common+0x125/0x140 [ 28.586436] [] ? skb_warn_bad_offload+0x2af/0x390 [ 28.592904] [] warn_slowpath_fmt+0xc1/0x110 [ 28.598841] [] ? warn_slowpath_common+0x140/0x140 [ 28.605304] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 28.612199] [] ? ___ratelimit+0x53/0x3e0 [ 28.617878] [] skb_warn_bad_offload+0x2af/0x390 [ 28.624176] [] __skb_gso_segment+0x3b3/0x4a0 [ 28.630211] [] validate_xmit_skb.isra.100.part.101+0x44e/0x970 [ 28.637802] [] validate_xmit_skb_list+0xae/0x110 [ 28.644184] [] sch_direct_xmit+0x34f/0x760 [ 28.650044] [] ? dev_deactivate_queue.constprop.34+0x150/0x150 [ 28.657636] [] __dev_queue_xmit+0x1368/0x1a70 [ 28.663750] [] ? __dev_queue_xmit+0x1a6/0x1a70 [ 28.669951] [] ? netdev_pick_tx+0x310/0x310 [ 28.675901] [] ? tun_select_queue+0x1c8/0x380 [ 28.682014] [] ? tun_chr_ioctl+0x40/0x40 [ 28.687703] [] ? tun_chr_ioctl+0x40/0x40 [ 28.693385] [] dev_queue_xmit+0x17/0x20 [ 28.698988] [] packet_sendmsg+0x29b2/0x47e0 [ 28.704931] [] ? avc_has_perm_noaudit+0x460/0x460 [ 28.711392] [] ? packet_cached_dev_get+0x200/0x200 [ 28.717940] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 28.725007] [] ? save_stack+0x43/0xd0 [ 28.730426] [] ? kasan_kmalloc+0x42/0xe0 [ 28.736107] [] ? kmem_cache_alloc+0xba/0x290 [ 28.742136] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 28.748599] [] ? security_socket_sendmsg+0x89/0xb0 [ 28.755149] [] ? packet_cached_dev_get+0x200/0x200 [ 28.761696] [] sock_sendmsg+0xca/0x110 [ 28.767203] [] sock_write_iter+0x226/0x3b0 [ 28.773065] [] ? avc_has_perm_noaudit+0x460/0x460 [ 28.779526] [] ? sock_sendmsg+0x110/0x110 [ 28.785294] [] ? iov_iter_init+0xaf/0x1d0 [ 28.791059] [] __vfs_write+0x33c/0x450 [ 28.796566] [] ? __vfs_read+0x440/0x440 [ 28.802158] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.808107] [] ? selinux_file_permission+0x348/0x460 [ 28.814832] [] ? rw_verify_area+0x100/0x2f0 [ 28.820773] [] vfs_write+0x18a/0x530 [ 28.826103] [] SyS_write+0xd9/0x1b0 [ 28.831344] [] ? SyS_read+0x1b0/0x1b0 [ 28.836765] [] ? do_fast_syscall_32+0xd7/0x890 [ 28.842971] [] ? SyS_read+0x1b0/0x1b0 [ 28.848391] [] do_fast_syscall_32+0x314/0x890 [ 28.854506] [] sysenter_flags_fixed+0xd/0x17 [ 28.860985] Dumping ftrace buffer: [ 28.864526] (ftrace buffer empty) [ 28.868206] Kernel Offset: disabled [ 28.871822] Rebooting in 86400 seconds..