[....] Starting OpenBSD Secure Shell server: sshd[ 20.419106] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 20.543159] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [ 20.889657] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.088732] random: sshd: uninitialized urandom read (32 bytes read, 125 bits of entropy available) [ 22.243048] random: sshd: uninitialized urandom read (32 bytes read, 128 bits of entropy available) [ 22.304811] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.42' (ECDSA) to the list of known hosts. 2018/04/28 22:01:28 parsed 1 programs 2018/04/28 22:01:28 executed programs: 0 [ 28.158344] IPVS: Creating netns size=2552 id=1 2018/04/28 22:01:34 executed programs: 4 2018/04/28 22:01:39 executed programs: 8 [ 40.028010] ------------[ cut here ]------------ [ 40.032787] WARNING: CPU: 0 PID: 3891 at kernel/signal.c:343 task_participate_group_stop+0x219/0x2c0() [ 40.042277] Kernel panic - not syncing: panic_on_warn set ... [ 40.042277] [ 40.049611] CPU: 0 PID: 3891 Comm: 3 Not tainted 4.4.129-g23eaecc #26 [ 40.056157] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.065480] 0000000000000000 7ee75e049805e62a ffff8801c93dfab0 ffffffff81e0dc8d [ 40.073454] ffffffff83a43ec0 ffff8800bafbb000 ffffffff83a49b00 0000000000000009 [ 40.081438] 0000000000000157 ffff8801c93dfb70 ffffffff81409ed4 0000000041b58ab3 [ 40.089412] Call Trace: [ 40.091975] [] dump_stack+0xc1/0x124 [ 40.097309] [] panic+0x19e/0x38d [ 40.102299] [] ? add_taint.cold.4+0x16/0x16 [ 40.108243] [] ? warn_slowpath_common.cold.6+0x5/0x20 [ 40.115050] [] warn_slowpath_common.cold.6+0x20/0x20 [ 40.121771] [] ? task_participate_group_stop+0x219/0x2c0 [ 40.128849] [] warn_slowpath_null+0x29/0x30 [ 40.134790] [] task_participate_group_stop+0x219/0x2c0 [ 40.141687] [] ? do_signal_stop+0x553/0x7c0 [ 40.147626] [] do_signal_stop+0x36f/0x7c0 [ 40.153394] [] get_signal+0x5de/0x14b0 [ 40.158900] [] ? check_preemption_disabled+0x3b/0x170 [ 40.165710] [] do_signal+0x8b/0x1d30 [ 40.171042] [] ? kmem_cache_free+0x2b4/0x340 [ 40.177068] [] ? setup_sigcontext+0x780/0x780 [ 40.183183] [] ? do_execveat_common.isra.36+0x242/0x1f10 [ 40.190251] [] ? do_execveat_common.isra.36+0x1077/0x1f10 [ 40.197405] [] ? prepare_bprm_creds+0x110/0x110 [ 40.203709] [] ? exit_to_usermode_loop+0xe4/0x160 [ 40.210178] [] exit_to_usermode_loop+0x11a/0x160 [ 40.216551] [] do_fast_syscall_32+0x620/0x8b0 [ 40.222669] [] sysenter_flags_fixed+0xd/0x17 [ 40.229188] Dumping ftrace buffer: [ 40.232770] (ftrace buffer empty) [ 40.236463] Kernel Offset: disabled [ 40.240120] Rebooting in 86400 seconds..