[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.699397] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.541982] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.926552] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 22.679674] random: sshd: uninitialized urandom read (32 bytes read, 88 bits of entropy available) [ 23.799601] random: sshd: uninitialized urandom read (32 bytes read, 92 bits of entropy available) Warning: Permanently added '10.128.0.33' (ECDSA) to the list of known hosts. [ 29.188454] random: sshd: uninitialized urandom read (32 bytes read, 100 bits of entropy available) executing program [ 29.301954] ------------[ cut here ]------------ [ 29.306763] WARNING: CPU: 1 PID: 1 at kernel/signal.c:334 task_participate_group_stop+0x21d/0x2d0() [ 29.316062] Kernel panic - not syncing: panic_on_warn set ... [ 29.316062] [ 29.323400] CPU: 1 PID: 1 Comm: init Not tainted 4.4.107-g610c835 #4 [ 29.329863] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.339189] 0000000000000000 c9b93b69849a3a30 ffff8801da20fa38 ffffffff81d0457d [ 29.347183] ffffffff838429a0 ffff8801da20fb10 ffffffff838485e0 0000000000000009 [ 29.355170] 000000000000014e ffff8801da20fb00 ffffffff8141774a 0000000041b58ab3 [ 29.363152] Call Trace: [ 29.365725] [] dump_stack+0xc1/0x124 [ 29.371065] [] panic+0x1aa/0x388 [ 29.376054] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 29.382953] [] ? pm_qos_get_value.part.4+0xb/0xb [ 29.389335] [] ? warn_slowpath_common+0x10a/0x140 [ 29.395801] [] warn_slowpath_common+0x125/0x140 [ 29.402096] [] ? task_participate_group_stop+0x21d/0x2d0 [ 29.409171] [] warn_slowpath_null+0x29/0x30 [ 29.415115] [] task_participate_group_stop+0x21d/0x2d0 [ 29.422016] [] ? do_signal_stop+0x385/0x7a0 [ 29.427958] [] do_signal_stop+0x19b/0x7a0 [ 29.433730] [] get_signal+0x4c8/0x1660 [ 29.439241] [] do_signal+0x8b/0x1d40 [ 29.444579] [] ? __might_fault+0x18e/0x1d0 [ 29.450437] [] ? __might_fault+0xe4/0x1d0 [ 29.456210] [] ? setup_sigcontext+0x780/0x780 [ 29.462327] [] ? poll_schedule_timeout+0x1f0/0x1f0 [ 29.468881] [] ? kvm_clock_get_cycles+0x9/0x10 [ 29.475088] [] ? poll_select_set_timeout+0xa6/0x110 [ 29.481729] [] ? SyS_select+0x168/0x1d0 [ 29.487324] [] ? exit_to_usermode_loop+0xec/0x170 [ 29.493792] [] exit_to_usermode_loop+0x122/0x170 [ 29.500169] [] syscall_return_slowpath+0x1b5/0x1f0 [ 29.506724] [] int_ret_from_sys_call+0x25/0x9f [ 30.642071] Shutting down cpus with NMI [ 30.646126] Dumping ftrace buffer: [ 30.649751] (ftrace buffer empty) [ 30.653430] Kernel Offset: disabled [ 30.657058] Rebooting in 86400 seconds..