[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.578331] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.009027] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 23.282231] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 24.341315] random: sshd: uninitialized urandom read (32 bytes read, 124 bits of entropy available) [ 24.624068] random: nonblocking pool is initialized Warning: Permanently added '10.128.10.37' (ECDSA) to the list of known hosts. executing program [ 30.268860] ------------[ cut here ]------------ [ 30.273633] WARNING: CPU: 0 PID: 3838 at net/packet/af_packet.c:4122 packet_set_ring+0x131c/0x1840() [ 30.282896] Tx-ring is not supported. [ 30.286782] Kernel panic - not syncing: panic_on_warn set ... [ 30.286782] [ 30.294120] CPU: 0 PID: 3838 Comm: syz-executor287 Not tainted 4.4.129-g23eaecc #27 [ 30.301883] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.311207] 0000000000000000 af58fef1a641ff0d ffff8801c6c77938 ffffffff81e0dc8d [ 30.319205] ffffffff83a43ec0 ffff8800ac5b6000 ffffffff83f3c720 0000000000000009 [ 30.327177] 000000000000101a ffff8801c6c779f8 ffffffff81409ed4 0000000041b58ab3 [ 30.335145] Call Trace: [ 30.337707] [] dump_stack+0xc1/0x124 [ 30.343043] [] panic+0x19e/0x38d [ 30.348029] [] ? add_taint.cold.4+0x16/0x16 [ 30.353970] [] ? warn_slowpath_common.cold.6+0x5/0x20 [ 30.360779] [] warn_slowpath_common.cold.6+0x20/0x20 [ 30.367513] [] ? packet_set_ring+0x131c/0x1840 [ 30.373719] [] warn_slowpath_fmt+0xbf/0x100 [ 30.379660] [] ? warn_slowpath_common+0x120/0x120 [ 30.386123] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 30.392933] [] ? lock_sock_nested+0x90/0x120 [ 30.398959] [] ? trace_hardirqs_on+0xd/0x10 [ 30.404900] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 30.411187] [] packet_set_ring+0x131c/0x1840 [ 30.417215] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 30.423761] [] ? packet_read_pending.isra.64.part.65+0x170/0x170 [ 30.431529] [] packet_setsockopt+0x5c2/0x2260 [ 30.437650] [] ? packet_release+0x9e0/0x9e0 [ 30.443591] [] ? sock_has_perm+0x29f/0x400 [ 30.449446] [] ? sock_has_perm+0x9f/0x400 [ 30.455219] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 30.462287] [] ? selinux_netlbl_socket_setsockopt+0x97/0x340 [ 30.469703] [] ? selinux_netlbl_sock_rcv_skb+0x400/0x400 [ 30.476773] [] ? selinux_socket_setsockopt+0x6d/0x80 [ 30.483494] [] SyS_setsockopt+0x166/0x260 [ 30.489260] [] ? vmacache_update+0xfe/0x130 [ 30.495201] [] ? SyS_recv+0x40/0x40 [ 30.500451] [] ? retint_user+0x18/0x3c [ 30.505957] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 30.512420] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 30.519502] Dumping ftrace buffer: [ 30.523053] (ftrace buffer empty) [ 30.526737] Kernel Offset: disabled [ 30.530348] Rebooting in 86400 seconds..