[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.372082] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.018425] random: sshd: uninitialized urandom read (32 bytes read) [ 23.268062] random: sshd: uninitialized urandom read (32 bytes read) [ 23.977822] random: sshd: uninitialized urandom read (32 bytes read) [ 24.134835] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.4' (ECDSA) to the list of known hosts. [ 29.599669] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.689694] WARNING: CPU: 1 PID: 4493 at include/net/sock.h:639 smc_unhash_sk+0x345/0x4a0 [ 29.698082] Kernel panic - not syncing: panic_on_warn set ... [ 29.698082] [ 29.705432] CPU: 1 PID: 4493 Comm: syz-executor384 Not tainted 4.17.0-rc2+ #24 [ 29.712780] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.722121] Call Trace: [ 29.724699] dump_stack+0x1b9/0x294 [ 29.728318] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.733493] ? smc_unhash_sk+0x320/0x4a0 [ 29.737535] panic+0x22f/0x4de [ 29.740707] ? add_taint.cold.5+0x16/0x16 [ 29.744835] ? __warn.cold.8+0x148/0x1b3 [ 29.748876] ? __warn.cold.8+0x117/0x1b3 [ 29.752922] ? smc_unhash_sk+0x345/0x4a0 [ 29.756966] __warn.cold.8+0x163/0x1b3 [ 29.760837] ? smc_unhash_sk+0x345/0x4a0 [ 29.764885] report_bug+0x252/0x2d0 [ 29.768508] do_error_trap+0x1de/0x490 [ 29.772384] ? graph_lock+0x170/0x170 [ 29.776166] ? math_error+0x420/0x420 [ 29.779955] ? lock_acquire+0x1dc/0x520 [ 29.783925] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.788753] do_invalid_op+0x1b/0x20 [ 29.792449] invalid_op+0x14/0x20 [ 29.795881] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 29.800528] RSP: 0018:ffff8801b0b27488 EFLAGS: 00010293 [ 29.805868] RAX: ffff8801b0d2c200 RBX: ffff8801d8c8e7c0 RCX: ffffffff873f926e [ 29.813114] RDX: 0000000000000000 RSI: ffffffff873f9325 RDI: 0000000000000005 [ 29.820360] RBP: ffff8801b0b27570 R08: ffff8801b0d2c200 R09: ffffed003b191d08 [ 29.827612] R10: ffffed003b191d08 R11: ffff8801d8c8e843 R12: 1ffff10036164e95 [ 29.834877] R13: ffff8801b0b27548 R14: ffffffff8970dea0 R15: ffff8801d8c8e840 [ 29.842148] ? smc_unhash_sk+0x28e/0x4a0 [ 29.846193] ? smc_unhash_sk+0x345/0x4a0 [ 29.850240] ? smc_unhash_sk+0x345/0x4a0 [ 29.854286] ? smc_hash_sk+0x2f0/0x2f0 [ 29.858164] ? release_sock+0x1e2/0x2b0 [ 29.862129] ? __local_bh_enable_ip+0x161/0x230 [ 29.866778] ? __release_sock+0x3a0/0x3a0 [ 29.870905] ? smc_release+0x269/0x610 [ 29.874772] ? trace_hardirqs_on+0xd/0x10 [ 29.878901] ? __local_bh_enable_ip+0x161/0x230 [ 29.883551] smc_release+0x36e/0x610 [ 29.887244] sock_release+0x96/0x1b0 [ 29.890941] ? sock_alloc_file+0x4e0/0x4e0 [ 29.895163] sock_close+0x16/0x20 [ 29.898604] __fput+0x34d/0x890 [ 29.901863] ? fput+0x1a0/0x1a0 [ 29.905122] ? _raw_spin_unlock_irq+0x27/0x70 [ 29.909601] ____fput+0x15/0x20 [ 29.912862] task_work_run+0x1e4/0x290 [ 29.916729] ? task_work_cancel+0x240/0x240 [ 29.921040] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 29.926563] ? switch_task_namespaces+0xa2/0xd0 [ 29.931214] do_exit+0x1aee/0x2730 [ 29.934735] ? mm_update_next_owner+0x980/0x980 [ 29.939382] ? lock_downgrade+0x8e0/0x8e0 [ 29.943510] ? noop_count+0x40/0x40 [ 29.947115] ? lock_pin_lock+0x350/0x350 [ 29.951156] ? kasan_check_read+0x11/0x20 [ 29.955281] ? rcu_is_watching+0x85/0x140 [ 29.959409] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 29.964578] ? is_bpf_text_address+0xd7/0x170 [ 29.969061] ? check_usage_backwards+0x151/0x3a0 [ 29.973804] ? graph_lock+0x170/0x170 [ 29.977585] ? graph_lock+0x170/0x170 [ 29.981375] ? find_held_lock+0x36/0x1c0 [ 29.985422] ? lock_downgrade+0x8e0/0x8e0 [ 29.989563] ? kasan_check_read+0x11/0x20 [ 29.993695] ? do_raw_spin_unlock+0x9e/0x2e0 [ 29.998088] ? __local_bh_enable_ip+0x161/0x230 [ 30.002746] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.007753] ? release_sock+0x1e2/0x2b0 [ 30.011709] ? trace_hardirqs_on+0xd/0x10 [ 30.015840] ? __local_bh_enable_ip+0x161/0x230 [ 30.020496] ? _raw_spin_unlock_bh+0x30/0x40 [ 30.024893] ? release_sock+0x1e2/0x2b0 [ 30.028851] ? __release_sock+0x3a0/0x3a0 [ 30.032984] ? __local_bh_enable_ip+0x161/0x230 [ 30.037647] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 30.042833] ? smc_setsockopt+0x1ed/0x630 [ 30.046973] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.052500] ? __sys_setsockopt+0x24f/0x390 [ 30.056818] do_group_exit+0x16f/0x430 [ 30.060696] ? mm_fault_error+0x380/0x380 [ 30.064822] ? __ia32_sys_exit+0x50/0x50 [ 30.068864] ? do_syscall_64+0x92/0x800 [ 30.072820] __x64_sys_exit_group+0x3e/0x50 [ 30.077121] do_syscall_64+0x1b1/0x800 [ 30.080988] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 30.085814] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.090724] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.095640] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.100982] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.105810] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.110976] RIP: 0033:0x43e8b8 [ 30.114145] RSP: 002b:00007ffe650019e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 30.121832] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8b8 [ 30.129079] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 30.136331] RBP: 00000000004be260 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 30.143582] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 30.150835] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 30.158684] Dumping ftrace buffer: [ 30.162303] (ftrace buffer empty) [ 30.165988] Kernel Offset: disabled [ 30.169596] Rebooting in 86400 seconds..