[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.769823] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.462187] random: sshd: uninitialized urandom read (32 bytes read) [ 19.665012] random: sshd: uninitialized urandom read (32 bytes read) [ 20.180615] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.14' (ECDSA) to the list of known hosts. [ 25.916742] urandom_read: 1 callbacks suppressed [ 25.916745] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program [ 26.139209] ------------[ cut here ]------------ [ 26.144007] WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760 [ 26.152501] Kernel panic - not syncing: panic_on_warn set ... [ 26.152501] [ 26.159852] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.124-g09eb2ba #83 [ 26.166840] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.176175] ffff8801db207cc0 ffffffff81eb95e9 ffffffff83c48ac0 00000000ffffffff [ 26.184266] 0000000000000000 0000000000000000 00000000000000a7 ffff8801db207d80 [ 26.192408] ffffffff81423eb5 0000000041b58ab3 ffffffff843bb8e8 ffffffff81423cf6 [ 26.200640] Call Trace: [ 26.203205] <IRQ> [ 26.205249] [<ffffffff81eb95e9>] dump_stack+0xc1/0x128 [ 26.210618] [<ffffffff81423eb5>] panic+0x1bf/0x3bc [ 26.215609] [<ffffffff81423cf6>] ? add_taint.cold.6+0x16/0x16 [ 26.221556] [<ffffffff81424186>] ? __warn.cold.9+0xa6/0x17f [ 26.227335] [<ffffffff8342c878>] ? inet_sock_destruct+0x598/0x760 [ 26.233765] [<ffffffff814241a1>] __warn.cold.9+0xc1/0x17f [ 26.239373] [<ffffffff836c4fef>] ? l2tp_tunnel_closeall+0x2af/0x350 [ 26.245849] [<ffffffff811383bc>] warn_slowpath_null+0x2c/0x40 [ 26.251811] [<ffffffff8342c878>] inet_sock_destruct+0x598/0x760 [ 26.257932] [<ffffffff8342c2e0>] ? ipv4_mib_init_net+0x570/0x570 [ 26.264162] [<ffffffff836c5839>] l2tp_tunnel_destruct+0x339/0x590 [ 26.270528] [<ffffffff836c56aa>] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 26.277002] [<ffffffff836c5500>] ? l2tp_tunnel_del_work+0x470/0x470 [ 26.283473] [<ffffffff830281f5>] __sk_destruct+0x55/0x590 [ 26.289080] [<ffffffff812899ee>] rcu_process_callbacks+0x8ae/0x12b0 [ 26.295559] [<ffffffff81289ace>] ? rcu_process_callbacks+0x98e/0x12b0 [ 26.302201] [<ffffffff830281a0>] ? sock_set_timeout+0x210/0x210 [ 26.308322] [<ffffffff83a085c0>] __do_softirq+0x210/0x940 [ 26.313947] [<ffffffff8114d554>] irq_exit+0x114/0x150 [ 26.319204] [<ffffffff83a071a1>] smp_apic_timer_interrupt+0x81/0xa0 [ 26.325674] [<ffffffff83a03330>] apic_timer_interrupt+0xa0/0xb0 [ 26.331791] <EOI> [ 26.333834] [<ffffffff83a00606>] ? native_safe_halt+0x6/0x10 [ 26.339824] [<ffffffff839ffc45>] default_idle+0x55/0x360 [ 26.345346] [<ffffffff8106ae20>] arch_cpu_idle+0x10/0x20 [ 26.350864] [<ffffffff83a00a65>] default_idle_call+0x45/0x60 [ 26.356729] [<ffffffff81225495>] cpu_startup_entry+0x2b5/0x380 [ 26.362905] [<ffffffff812251e0>] ? cpu_in_idle+0x20/0x20 [ 26.368421] [<ffffffff839ed8cc>] rest_init+0x183/0x189 [ 26.373767] [<ffffffff84c98943>] start_kernel+0x67e/0x6b2 [ 26.379370] [<ffffffff84c982c5>] ? thread_stack_cache_init+0xb/0xb [ 26.386187] [<ffffffff81ee81e2>] ? x86_family+0x32/0x40 [ 26.391619] [<ffffffff84c97120>] ? early_idt_handler_array+0x120/0x120 [ 26.398349] [<ffffffff84c9729a>] x86_64_start_reservations+0x29/0x2b [ 26.404905] [<ffffffff84c973db>] x86_64_start_kernel+0x13f/0x162 [ 26.411584] Dumping ftrace buffer: [ 26.415139] (ftrace buffer empty) [ 26.418836] Kernel Offset: disabled [ 26.422449] Rebooting in 86400 seconds..