[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.377574] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 20.218590] random: sshd: uninitialized urandom read (32 bytes read) [ 20.515178] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.208498] random: sshd: uninitialized urandom read (32 bytes read) [ 21.356515] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.31' (ECDSA) to the list of known hosts. [ 26.737386] random: sshd: uninitialized urandom read (32 bytes read) 2018/05/02 13:43:54 parsed 1 programs 2018/05/02 13:43:54 executed programs: 0 [ 27.223602] IPVS: ftp: loaded support on port[0] = 21 [ 27.237312] IPVS: ftp: loaded support on port[0] = 21 [ 27.246243] IPVS: ftp: loaded support on port[0] = 21 [ 27.253779] IPVS: ftp: loaded support on port[0] = 21 [ 27.272781] IPVS: ftp: loaded support on port[0] = 21 [ 27.276603] IPVS: ftp: loaded support on port[0] = 21 [ 27.301538] IPVS: ftp: loaded support on port[0] = 21 [ 27.320474] IPVS: ftp: loaded support on port[0] = 21 [ 28.362993] WARNING: CPU: 1 PID: 4511 at kernel/signal.c:351 task_participate_group_stop+0x205/0x260 [ 28.372407] Kernel panic - not syncing: panic_on_warn set ... [ 28.372407] [ 28.379778] CPU: 1 PID: 4511 Comm: 3 Not tainted 4.17.0-rc3+ #53 [ 28.385918] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.395263] Call Trace: [ 28.397851] dump_stack+0x1b9/0x294 [ 28.401475] ? dump_stack_print_info.cold.2+0x52/0x52 [ 28.406668] ? task_participate_group_stop+0x1f0/0x260 [ 28.411951] panic+0x22f/0x4de [ 28.415149] ? add_taint.cold.5+0x16/0x16 [ 28.419302] ? __warn.cold.8+0x148/0x1b3 [ 28.423363] ? __warn.cold.8+0x117/0x1b3 [ 28.427418] ? task_participate_group_stop+0x205/0x260 [ 28.432675] __warn.cold.8+0x163/0x1b3 [ 28.436544] ? task_participate_group_stop+0x205/0x260 [ 28.441801] report_bug+0x252/0x2d0 [ 28.445416] do_error_trap+0x1de/0x490 [ 28.449292] ? math_error+0x420/0x420 [ 28.453075] ? trace_hardirqs_off+0xd/0x10 [ 28.457292] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 28.462376] ? depot_save_stack+0x26b/0x450 [ 28.466679] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.471504] do_invalid_op+0x1b/0x20 [ 28.475201] invalid_op+0x14/0x20 [ 28.478648] RIP: 0010:task_participate_group_stop+0x205/0x260 [ 28.484510] RSP: 0018:ffff8801b31d7830 EFLAGS: 00010093 [ 28.489851] RAX: ffff8801cee36100 RBX: 0000000000000000 RCX: ffffffff81498cfb [ 28.497105] RDX: 0000000000000000 RSI: ffffffff81498e15 RDI: 0000000000000005 [ 28.504376] RBP: ffff8801b31d7850 R08: ffff8801cee36100 R09: ffffed003b2e3d19 [ 28.511633] R10: ffffed003b2e3d19 R11: ffff8801d971e8cb R12: ffff8801aed9da58 [ 28.518886] R13: ffff8801aed9d9c0 R14: 0000000000040000 R15: dffffc0000000000 [ 28.526153] ? task_participate_group_stop+0xeb/0x260 [ 28.531330] ? task_participate_group_stop+0x205/0x260 [ 28.536596] ? do_signal_stop+0x7a5/0xa20 [ 28.540724] do_signal_stop+0x502/0xa20 [ 28.544677] ? lock_release+0xa10/0xa10 [ 28.548634] ? ptrace_do_notify+0x330/0x330 [ 28.552933] ? check_same_owner+0x320/0x320 [ 28.557238] ? kasan_check_read+0x11/0x20 [ 28.561366] ? rcu_is_watching+0x85/0x140 [ 28.565502] ? kasan_check_write+0x14/0x20 [ 28.569722] ? do_raw_spin_lock+0xc1/0x200 [ 28.573940] get_signal+0x9b4/0x1960 [ 28.577645] ? put_files_struct+0x94/0x390 [ 28.581861] ? ptrace_notify+0x130/0x130 [ 28.585902] ? get_files_struct+0x80/0x80 [ 28.590037] ? rcu_read_lock_sched_held+0x108/0x120 [ 28.595042] ? kmem_cache_free+0x25c/0x2d0 [ 28.599260] ? do_execveat_common.isra.34+0x39c/0x2590 [ 28.604522] ? kmem_cache_alloc+0x12e/0x760 [ 28.608836] do_signal+0x98/0x2040 [ 28.612370] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 28.617542] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 28.622539] ? __check_object_size+0x95/0x5d9 [ 28.627022] ? setup_sigcontext+0x7d0/0x7d0 [ 28.631335] ? usercopy_warn+0x120/0x120 [ 28.635379] ? kasan_check_read+0x11/0x20 [ 28.639507] ? do_raw_spin_unlock+0x9e/0x2e0 [ 28.643906] ? kasan_check_read+0x11/0x20 [ 28.648046] ? rcu_pm_notify+0xc0/0xc0 [ 28.651915] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 28.657433] ? strncpy_from_user+0x3b6/0x500 [ 28.661823] ? exit_to_usermode_loop+0x87/0x310 [ 28.666474] exit_to_usermode_loop+0x28a/0x310 [ 28.671049] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 28.675881] ? __ia32_compat_sys_execveat+0xf1/0x140 [ 28.680973] do_fast_syscall_32+0xcc3/0xf9b [ 28.685291] ? do_int80_syscall_32+0x880/0x880 [ 28.689875] ? _raw_spin_unlock_irq+0x27/0x70 [ 28.694357] ? finish_task_switch+0x1ca/0x810 [ 28.698839] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.704363] ? syscall_return_slowpath+0x30f/0x5c0 [ 28.709280] ? sysret32_from_system_call+0x5/0x46 [ 28.714114] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.718940] entry_SYSENTER_compat+0x70/0x7f [ 28.723325] RIP: 0033:0x127 [ 28.726231] RSP: 002b:00007ffdd7c294b0 EFLAGS: 00000200 ORIG_RAX: 000000000000003b [ 28.733915] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 28.741164] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 28.748413] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 28.755658] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 28.762904] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 28.770814] Dumping ftrace buffer: [ 28.774466] (ftrace buffer empty) [ 28.778155] Kernel Offset: disabled [ 28.781760] Rebooting in 86400 seconds..