[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.144777] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.604717] random: sshd: uninitialized urandom read (32 bytes read) [ 23.900299] random: sshd: uninitialized urandom read (32 bytes read) [ 24.628819] random: sshd: uninitialized urandom read (32 bytes read) [ 24.784505] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.40' (ECDSA) to the list of known hosts. [ 30.284931] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program executing program executing program [ 30.468840] WARNING: CPU: 1 PID: 4520 at kernel/signal.c:351 task_participate_group_stop+0x205/0x260 [ 30.478224] Kernel panic - not syncing: panic_on_warn set ... [ 30.478224] [ 30.485588] CPU: 1 PID: 4520 Comm: 3 Not tainted 4.17.0-rc2+ #22 [ 30.491724] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.501062] Call Trace: [ 30.503642] dump_stack+0x1b9/0x294 [ 30.507254] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.512427] ? task_participate_group_stop+0x190/0x260 [ 30.517691] panic+0x22f/0x4de [ 30.520873] ? add_taint.cold.5+0x16/0x16 [ 30.525011] ? __warn.cold.8+0x148/0x1b3 [ 30.529056] ? __warn.cold.8+0x117/0x1b3 [ 30.533104] ? task_participate_group_stop+0x205/0x260 [ 30.538372] __warn.cold.8+0x163/0x1b3 [ 30.542238] ? task_participate_group_stop+0x205/0x260 [ 30.547493] report_bug+0x252/0x2d0 [ 30.551099] do_error_trap+0x1de/0x490 [ 30.554965] ? math_error+0x420/0x420 [ 30.558746] ? trace_hardirqs_off+0xd/0x10 [ 30.562959] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 30.568050] ? depot_save_stack+0x26b/0x450 [ 30.572354] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.577181] do_invalid_op+0x1b/0x20 [ 30.580879] invalid_op+0x14/0x20 [ 30.584332] RIP: 0010:task_participate_group_stop+0x205/0x260 [ 30.590201] RSP: 0018:ffff8801ae7b7880 EFLAGS: 00010093 [ 30.595555] RAX: ffff8801d96200c0 RBX: 0000000000000000 RCX: ffffffff81498b5b [ 30.602801] RDX: 0000000000000000 RSI: ffffffff81498c75 RDI: 0000000000000005 [ 30.610055] RBP: ffff8801ae7b78a0 R08: ffff8801d96200c0 R09: ffffed0036c48971 [ 30.617319] R10: ffffed0036c48971 R11: ffff8801b6244b8b R12: ffff8801d926ecd8 [ 30.624577] R13: ffff8801d926ec40 R14: 0000000000040000 R15: dffffc0000000000 [ 30.631849] ? task_participate_group_stop+0xeb/0x260 [ 30.637041] ? task_participate_group_stop+0x205/0x260 [ 30.642314] ? do_signal_stop+0x7a5/0xa20 [ 30.646441] do_signal_stop+0x502/0xa20 [ 30.650395] ? lock_release+0xa10/0xa10 [ 30.654364] ? ptrace_do_notify+0x330/0x330 [ 30.658668] ? check_same_owner+0x320/0x320 [ 30.662969] ? kasan_check_read+0x11/0x20 [ 30.667106] ? rcu_is_watching+0x85/0x140 [ 30.671244] ? kasan_check_write+0x14/0x20 [ 30.675460] ? do_raw_spin_lock+0xc1/0x200 [ 30.679684] get_signal+0x9b4/0x1960 [ 30.683391] ? put_files_struct+0x94/0x390 [ 30.687609] ? ptrace_notify+0x130/0x130 [ 30.691659] ? get_files_struct+0x80/0x80 [ 30.695791] ? rcu_read_lock_sched_held+0x108/0x120 [ 30.700787] ? kmem_cache_free+0x25c/0x2d0 [ 30.705003] ? do_execveat_common.isra.34+0x39c/0x2590 [ 30.710270] ? kmem_cache_alloc+0x12e/0x760 [ 30.714587] do_signal+0x98/0x2040 [ 30.718115] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 30.723300] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 30.728296] ? __check_object_size+0x95/0x5d9 [ 30.732771] ? setup_sigcontext+0x7d0/0x7d0 [ 30.737081] ? usercopy_warn+0x120/0x120 [ 30.741121] ? kasan_check_read+0x11/0x20 [ 30.745247] ? do_raw_spin_unlock+0x9e/0x2e0 [ 30.749638] ? kasan_check_read+0x11/0x20 [ 30.753770] ? rcu_pm_notify+0xc0/0xc0 [ 30.757649] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.763165] ? strncpy_from_user+0x3b6/0x500 [ 30.767556] ? exit_to_usermode_loop+0x87/0x310 [ 30.772211] exit_to_usermode_loop+0x28a/0x310 [ 30.776775] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 30.781599] ? __x64_sys_execveat+0xeb/0x130 [ 30.785993] do_syscall_64+0x6ac/0x800 [ 30.789875] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.794792] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.799700] ? retint_user+0x18/0x18 [ 30.803393] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.808227] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.813402] RIP: 0033:0x127 [ 30.816308] RSP: 002b:00007ffda970b440 EFLAGS: 00000200 ORIG_RAX: 000000000000003b [ 30.823998] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 30.831250] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 30.838500] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 30.845753] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 30.853012] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 30.860837] Dumping ftrace buffer: [ 30.864468] (ftrace buffer empty) [ 30.868154] Kernel Offset: disabled [ 30.871759] Rebooting in 86400 seconds..