[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.769823] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?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] [ 26.205249] [] dump_stack+0xc1/0x128 [ 26.210618] [] panic+0x1bf/0x3bc [ 26.215609] [] ? add_taint.cold.6+0x16/0x16 [ 26.221556] [] ? __warn.cold.9+0xa6/0x17f [ 26.227335] [] ? inet_sock_destruct+0x598/0x760 [ 26.233765] [] __warn.cold.9+0xc1/0x17f [ 26.239373] [] ? l2tp_tunnel_closeall+0x2af/0x350 [ 26.245849] [] warn_slowpath_null+0x2c/0x40 [ 26.251811] [] inet_sock_destruct+0x598/0x760 [ 26.257932] [] ? ipv4_mib_init_net+0x570/0x570 [ 26.264162] [] l2tp_tunnel_destruct+0x339/0x590 [ 26.270528] [] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 26.277002] [] ? l2tp_tunnel_del_work+0x470/0x470 [ 26.283473] [] __sk_destruct+0x55/0x590 [ 26.289080] [] rcu_process_callbacks+0x8ae/0x12b0 [ 26.295559] [] ? rcu_process_callbacks+0x98e/0x12b0 [ 26.302201] [] ? sock_set_timeout+0x210/0x210 [ 26.308322] [] __do_softirq+0x210/0x940 [ 26.313947] [] irq_exit+0x114/0x150 [ 26.319204] [] smp_apic_timer_interrupt+0x81/0xa0 [ 26.325674] [] apic_timer_interrupt+0xa0/0xb0 [ 26.331791] [ 26.333834] [] ? native_safe_halt+0x6/0x10 [ 26.339824] [] default_idle+0x55/0x360 [ 26.345346] [] arch_cpu_idle+0x10/0x20 [ 26.350864] [] default_idle_call+0x45/0x60 [ 26.356729] [] cpu_startup_entry+0x2b5/0x380 [ 26.362905] [] ? cpu_in_idle+0x20/0x20 [ 26.368421] [] rest_init+0x183/0x189 [ 26.373767] [] start_kernel+0x67e/0x6b2 [ 26.379370] [] ? thread_stack_cache_init+0xb/0xb [ 26.386187] [] ? x86_family+0x32/0x40 [ 26.391619] [] ? early_idt_handler_array+0x120/0x120 [ 26.398349] [] x86_64_start_reservations+0x29/0x2b [ 26.404905] [] 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..