[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.567494] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.518060] random: sshd: uninitialized urandom read (32 bytes read) [ 24.019948] random: sshd: uninitialized urandom read (32 bytes read) [ 24.780759] random: sshd: uninitialized urandom read (32 bytes read) [ 24.943994] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.50' (ECDSA) to the list of known hosts. [ 30.396397] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.490164] WARNING: CPU: 0 PID: 4557 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 30.498575] Kernel panic - not syncing: panic_on_warn set ... [ 30.498575] [ 30.505944] CPU: 0 PID: 4557 Comm: syz-executor087 Not tainted 4.17.0-rc4+ #41 [ 30.513295] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.522632] Call Trace: [ 30.525222] dump_stack+0x1b9/0x294 [ 30.528853] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.534126] ? smc_unhash_sk+0x2d0/0x4a0 [ 30.538174] panic+0x22f/0x4de [ 30.541351] ? add_taint.cold.5+0x16/0x16 [ 30.545490] ? __warn.cold.8+0x148/0x1b3 [ 30.549549] ? __warn.cold.8+0x117/0x1b3 [ 30.553612] ? smc_unhash_sk+0x345/0x4a0 [ 30.557685] __warn.cold.8+0x163/0x1b3 [ 30.561578] ? smc_unhash_sk+0x345/0x4a0 [ 30.565627] report_bug+0x252/0x2d0 [ 30.569248] do_error_trap+0x1de/0x490 [ 30.573124] ? graph_lock+0x170/0x170 [ 30.576930] ? math_error+0x420/0x420 [ 30.580725] ? lock_acquire+0x1dc/0x520 [ 30.584689] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.589618] do_invalid_op+0x1b/0x20 [ 30.593428] invalid_op+0x14/0x20 [ 30.596871] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 30.601525] RSP: 0018:ffff8801af68f488 EFLAGS: 00010293 [ 30.606880] RAX: ffff8801adbf8540 RBX: ffff8801ab87a7c0 RCX: ffffffff87404cbe [ 30.614581] RDX: 0000000000000000 RSI: ffffffff87404d75 RDI: 0000000000000005 [ 30.621865] RBP: ffff8801af68f570 R08: ffff8801adbf8540 R09: ffffed003570f508 [ 30.629147] R10: ffffed003570f508 R11: ffff8801ab87a843 R12: 1ffff10035ed1e95 [ 30.636514] R13: ffff8801af68f548 R14: ffffffff8970cc20 R15: ffff8801ab87a840 [ 30.643828] ? smc_unhash_sk+0x28e/0x4a0 [ 30.648017] ? smc_unhash_sk+0x345/0x4a0 [ 30.652108] ? smc_unhash_sk+0x345/0x4a0 [ 30.656197] ? smc_rx_data_available+0x100/0x100 [ 30.661096] ? release_sock+0x1e2/0x2b0 [ 30.665114] ? __local_bh_enable_ip+0x161/0x230 [ 30.669793] ? __release_sock+0x3a0/0x3a0 [ 30.673948] ? smc_release+0x269/0x610 [ 30.677829] ? trace_hardirqs_on+0xd/0x10 [ 30.681966] ? __local_bh_enable_ip+0x161/0x230 [ 30.686621] smc_release+0x36e/0x610 [ 30.690340] sock_release+0x96/0x1b0 [ 30.694054] ? sock_alloc_file+0x4e0/0x4e0 [ 30.698298] sock_close+0x16/0x20 [ 30.701739] __fput+0x34d/0x890 [ 30.705004] ? fput+0x1a0/0x1a0 [ 30.708276] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.712758] ____fput+0x15/0x20 [ 30.716113] task_work_run+0x1e4/0x290 [ 30.719994] ? task_work_cancel+0x240/0x240 [ 30.724312] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.729848] ? switch_task_namespaces+0xa2/0xd0 [ 30.734505] do_exit+0x1aee/0x2730 [ 30.738058] ? mm_update_next_owner+0x980/0x980 [ 30.742713] ? lock_downgrade+0x8e0/0x8e0 [ 30.746864] ? noop_count+0x40/0x40 [ 30.750472] ? lock_pin_lock+0x350/0x350 [ 30.754521] ? kasan_check_read+0x11/0x20 [ 30.758653] ? rcu_is_watching+0x85/0x140 [ 30.762788] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 30.767976] ? is_bpf_text_address+0xd7/0x170 [ 30.772481] ? check_usage_backwards+0x151/0x3a0 [ 30.777251] ? graph_lock+0x170/0x170 [ 30.781051] ? graph_lock+0x170/0x170 [ 30.784863] ? find_held_lock+0x36/0x1c0 [ 30.788918] ? lock_downgrade+0x8e0/0x8e0 [ 30.793064] ? kasan_check_read+0x11/0x20 [ 30.797204] ? do_raw_spin_unlock+0x9e/0x2e0 [ 30.801604] ? __local_bh_enable_ip+0x161/0x230 [ 30.806263] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.811266] ? release_sock+0x1e2/0x2b0 [ 30.815230] ? trace_hardirqs_on+0xd/0x10 [ 30.819364] ? __local_bh_enable_ip+0x161/0x230 [ 30.824028] ? _raw_spin_unlock_bh+0x30/0x40 [ 30.828446] ? release_sock+0x1e2/0x2b0 [ 30.832408] ? __release_sock+0x3a0/0x3a0 [ 30.836542] ? __local_bh_enable_ip+0x161/0x230 [ 30.841197] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 30.846382] ? smc_setsockopt+0x1ed/0x630 [ 30.850523] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.856049] ? __sys_setsockopt+0x24f/0x390 [ 30.860364] do_group_exit+0x16f/0x430 [ 30.864245] ? mm_fault_error+0x380/0x380 [ 30.868380] ? __ia32_sys_exit+0x50/0x50 [ 30.872427] ? do_syscall_64+0x92/0x800 [ 30.876403] __x64_sys_exit_group+0x3e/0x50 [ 30.880710] do_syscall_64+0x1b1/0x800 [ 30.884865] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.889779] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.894694] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.900057] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.905594] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.910773] RIP: 0033:0x43e8d8 [ 30.913940] RSP: 002b:00007ffd1103d2d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 30.921629] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 30.928888] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 30.936402] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 30.943652] R10: 0000000020000180 R11: 0000000000000246 R12: 0000000000000001 [ 30.950909] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 30.958815] Dumping ftrace buffer: [ 30.962433] (ftrace buffer empty) [ 30.966129] Kernel Offset: disabled [ 30.969740] Rebooting in 86400 seconds..