[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.247146] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 16.875163] random: sshd: uninitialized urandom read (32 bytes read) [ 17.329296] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.949947] random: sshd: uninitialized urandom read (32 bytes read) [ 20.118875] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.60' (ECDSA) to the list of known hosts. [ 25.501868] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program [ 25.807326] ODEBUG: object ffff8801db307ce8 is NOT on stack ffff8801d9a80000, but annotated [ 25.815821] ------------[ cut here ]------------ [ 25.820560] WARNING: CPU: 1 PID: 0 at lib/debugobjects.c:303 __debug_object_init.cold.10+0x6b/0x2b0 [ 25.829718] Kernel panic - not syncing: panic_on_warn set ... [ 25.829718] [ 25.837055] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.9.117-g8b21e85 #19 [ 25.844038] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.853365] ffff8801db307a18 ffffffff81eb4be9 ffffffff83c48980 00000000ffffffff [ 25.861343] 0000000000000000 0000000000000001 000000000000012f ffff8801db307ad8 [ 25.869325] ffffffff81421c85 0000000041b58ab3 ffffffff843bc020 ffffffff81421ac6 [ 25.877317] Call Trace: [ 25.879872] [ 25.881909] [] dump_stack+0xc1/0x128 [ 25.887290] [] panic+0x1bf/0x3bc [ 25.892279] [] ? add_taint.cold.6+0x16/0x16 [ 25.898310] [] ? vprintk_default+0x1d/0x30 [ 25.904191] [] ? __warn.cold.9+0xa6/0x17f [ 25.910007] [] ? __debug_object_init.cold.10+0x6b/0x2b0 [ 25.917007] [] __warn.cold.9+0xc1/0x17f [ 25.922623] [] ? __debug_object_init+0x3ff/0xa20 [ 25.929005] [] warn_slowpath_null+0x2c/0x40 [ 25.934953] [] __debug_object_init.cold.10+0x6b/0x2b0 [ 25.941772] [] ? __lock_acquire+0x1011/0x4070 [ 25.947907] [] ? debug_object_fixup+0x30/0x30 [ 25.954025] [] debug_object_init_on_stack+0x19/0x20 [ 25.960669] [] __wait_rcu_gp+0x8a/0x1b0 [ 25.966265] [] synchronize_rcu.part.62+0xfa/0x110 [ 25.972730] [] ? rcu_pm_notify+0xc0/0xc0 [ 25.978426] [] ? debug_check_no_locks_freed+0x210/0x210 [ 25.985412] [] ? __call_rcu.constprop.69+0x910/0x910 [ 25.992138] [] ? __lock_is_held+0xa2/0xf0 [ 25.997924] [] synchronize_rcu+0x27/0x90 [ 26.003610] [] __l2tp_session_unhash+0x38a/0x520 [ 26.010000] [] ? __l2tp_session_unhash+0x1ac/0x520 [ 26.016558] [] ? l2tp_udp_encap_recv+0xbc0/0xbc0 [ 26.022936] [] l2tp_tunnel_closeall+0x1f7/0x350 [ 26.029240] [] l2tp_tunnel_destruct+0x2f2/0x590 [ 26.035533] [] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 26.041997] [] ? l2tp_tunnel_del_work+0x470/0x470 [ 26.048465] [] __sk_destruct+0x55/0x590 [ 26.054063] [] rcu_process_callbacks+0x8ae/0x12b0 [ 26.060530] [] ? rcu_process_callbacks+0x98e/0x12b0 [ 26.067170] [] ? sock_set_timeout+0x210/0x210 [ 26.073289] [] __do_softirq+0x20b/0x937 [ 26.078890] [] irq_exit+0x147/0x190 [ 26.084142] [] smp_apic_timer_interrupt+0x81/0xa0 [ 26.090617] [] apic_timer_interrupt+0xa0/0xb0 [ 26.096733] [ 26.098770] [] ? native_safe_halt+0x6/0x10 [ 26.104649] [] ? trace_hardirqs_on+0xd/0x10 [ 26.110603] [] default_idle+0x55/0x360 [ 26.116117] [] arch_cpu_idle+0x10/0x20 [ 26.121642] [] default_idle_call+0x45/0x60 [ 26.127509] [] cpu_startup_entry+0x2b5/0x380 [ 26.133539] [] ? cpu_in_idle+0x20/0x20 [ 26.139050] [] start_secondary+0x328/0x400 [ 26.144924] [] ? set_cpu_sibling_map+0x1300/0x1300 [ 26.152055] Dumping ftrace buffer: [ 26.155707] (ftrace buffer empty) [ 26.159393] Kernel Offset: disabled [ 26.163209] Rebooting in 86400 seconds..