[ 19.161986] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [ 19.259109] random: sshd: uninitialized urandom read (32 bytes read, 33 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. [ 19.540269] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.495878] random: sshd: uninitialized urandom read (32 bytes read, 110 bits of entropy available) [ 27.506079] random: sshd: uninitialized urandom read (32 bytes read, 119 bits of entropy available) Warning: Permanently added '10.128.0.4' (ECDSA) to the list of known hosts. [ 32.913247] random: sshd: uninitialized urandom read (32 bytes read, 125 bits of entropy available) executing program [ 33.011559] ------------[ cut here ]------------ [ 33.016635] WARNING: CPU: 1 PID: 3631 at net/packet/af_packet.c:4122 packet_set_ring+0x1337/0x18d0() [ 33.025926] Tx-ring is not supported. [ 33.029772] Kernel panic - not syncing: panic_on_warn set ... [ 33.029772] [ 33.037104] CPU: 1 PID: 3631 Comm: syzkaller802245 Not tainted 4.4.120-gd63fdf6 #28 [ 33.044863] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.054185] 0000000000000000 c85853fa54d9c1f4 ffff8800b110f938 ffffffff81d0408d [ 33.062147] ffffffff83843b40 ffff8800b110fa10 ffffffff83d20aa0 0000000000000009 [ 33.070103] 000000000000101a ffff8800b110fa00 ffffffff8141ab2a 0000000041b58ab3 [ 33.078064] Call Trace: [ 33.080625] [] dump_stack+0xc1/0x124 [ 33.085958] [] panic+0x1aa/0x388 [ 33.090941] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 33.097843] [] ? warn_slowpath_common+0x10a/0x140 [ 33.104310] [] warn_slowpath_common+0x125/0x140 [ 33.110599] [] ? packet_set_ring+0x1337/0x18d0 [ 33.116805] [] warn_slowpath_fmt+0xc1/0x110 [ 33.122744] [] ? warn_slowpath_common+0x140/0x140 [ 33.129206] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 33.136015] [] ? lock_sock_nested+0x90/0x120 [ 33.142040] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 33.148325] [] ? packet_set_ring+0x131f/0x18d0 [ 33.154521] [] packet_set_ring+0x1337/0x18d0 [ 33.160546] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 33.167092] [] ? __do_page_fault+0x149/0xa00 [ 33.173119] [] ? packet_read_pending.isra.63.part.64+0x190/0x190 [ 33.180880] [] packet_setsockopt+0x568/0x2270 [ 33.186992] [] ? packet_poll+0x5c0/0x5c0 [ 33.192669] [] ? sock_has_perm+0x29f/0x400 [ 33.198519] [] ? sock_has_perm+0x9f/0x400 [ 33.204284] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 33.211354] [] ? selinux_netlbl_socket_setsockopt+0x117/0x320 [ 33.218856] [] ? selinux_netlbl_sock_rcv_skb+0x400/0x400 [ 33.225921] [] ? selinux_socket_setsockopt+0x6d/0x80 [ 33.232640] [] SyS_setsockopt+0x160/0x250 [ 33.238409] [] ? vmacache_update+0xfe/0x130 [ 33.244345] [] ? SyS_recv+0x40/0x40 [ 33.249589] [] ? retint_user+0x18/0x3c [ 33.255092] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.261551] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 33.268554] Dumping ftrace buffer: [ 33.272092] (ftrace buffer empty) [ 33.275769] Kernel Offset: disabled [ 33.279378] Rebooting in 86400 seconds..