[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.705065] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.413303] random: sshd: uninitialized urandom read (32 bytes read) [ 24.773475] random: sshd: uninitialized urandom read (32 bytes read) [ 25.504967] random: sshd: uninitialized urandom read (32 bytes read) [ 26.880590] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.36' (ECDSA) to the list of known hosts. [ 32.365426] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.455659] WARNING: CPU: 1 PID: 4538 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 32.464059] Kernel panic - not syncing: panic_on_warn set ... [ 32.464059] [ 32.471410] CPU: 1 PID: 4538 Comm: syz-executor198 Not tainted 4.17.0-rc3+ #33 [ 32.478746] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.488080] Call Trace: [ 32.490653] dump_stack+0x1b9/0x294 [ 32.494265] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.499442] ? smc_unhash_sk+0x270/0x4a0 [ 32.503497] panic+0x22f/0x4de [ 32.506682] ? add_taint.cold.5+0x16/0x16 [ 32.510817] ? __warn.cold.8+0x148/0x1b3 [ 32.514858] ? __warn.cold.8+0x117/0x1b3 [ 32.518902] ? smc_unhash_sk+0x345/0x4a0 [ 32.522956] __warn.cold.8+0x163/0x1b3 [ 32.526831] ? smc_unhash_sk+0x345/0x4a0 [ 32.530881] report_bug+0x252/0x2d0 [ 32.534502] do_error_trap+0x1de/0x490 [ 32.538367] ? graph_lock+0x170/0x170 [ 32.542496] ? math_error+0x420/0x420 [ 32.546281] ? lock_acquire+0x1dc/0x520 [ 32.550240] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.555065] do_invalid_op+0x1b/0x20 [ 32.558763] invalid_op+0x14/0x20 [ 32.562205] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 32.566850] RSP: 0018:ffff8801b3c4f488 EFLAGS: 00010293 [ 32.572195] RAX: ffff8801d92fa540 RBX: ffff8801aeabc7c0 RCX: ffffffff873fe71e [ 32.579452] RDX: 0000000000000000 RSI: ffffffff873fe7d5 RDI: 0000000000000005 [ 32.586702] RBP: ffff8801b3c4f570 R08: ffff8801d92fa540 R09: ffffed0035d57908 [ 32.593960] R10: ffffed0035d57908 R11: ffff8801aeabc843 R12: 1ffff10036789e95 [ 32.601208] R13: ffff8801b3c4f548 R14: ffffffff8970e4e0 R15: ffff8801aeabc840 [ 32.608469] ? smc_unhash_sk+0x28e/0x4a0 [ 32.612511] ? smc_unhash_sk+0x345/0x4a0 [ 32.616553] ? smc_unhash_sk+0x345/0x4a0 [ 32.620600] ? smc_rx_data_available+0x100/0x100 [ 32.625341] ? release_sock+0x1e2/0x2b0 [ 32.629297] ? __local_bh_enable_ip+0x161/0x230 [ 32.633947] ? __release_sock+0x3a0/0x3a0 [ 32.638077] ? smc_release+0x269/0x610 [ 32.641945] ? trace_hardirqs_on+0xd/0x10 [ 32.646072] ? __local_bh_enable_ip+0x161/0x230 [ 32.650722] smc_release+0x36e/0x610 [ 32.654419] sock_release+0x96/0x1b0 [ 32.658123] ? sock_alloc_file+0x4e0/0x4e0 [ 32.662339] sock_close+0x16/0x20 [ 32.665775] __fput+0x34d/0x890 [ 32.669046] ? fput+0x1a0/0x1a0 [ 32.672310] ? _raw_spin_unlock_irq+0x27/0x70 [ 32.676788] ____fput+0x15/0x20 [ 32.680060] task_work_run+0x1e4/0x290 [ 32.683929] ? task_work_cancel+0x240/0x240 [ 32.688234] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 32.693755] ? switch_task_namespaces+0xa2/0xd0 [ 32.698409] do_exit+0x1aee/0x2730 [ 32.701933] ? mm_update_next_owner+0x980/0x980 [ 32.706580] ? lock_downgrade+0x8e0/0x8e0 [ 32.710707] ? noop_count+0x40/0x40 [ 32.714314] ? lock_pin_lock+0x350/0x350 [ 32.718359] ? kasan_check_read+0x11/0x20 [ 32.722489] ? rcu_is_watching+0x85/0x140 [ 32.726622] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 32.731797] ? is_bpf_text_address+0xd7/0x170 [ 32.736276] ? check_usage_backwards+0x151/0x3a0 [ 32.741019] ? graph_lock+0x170/0x170 [ 32.744807] ? graph_lock+0x170/0x170 [ 32.748606] ? find_held_lock+0x36/0x1c0 [ 32.752663] ? lock_downgrade+0x8e0/0x8e0 [ 32.756794] ? kasan_check_read+0x11/0x20 [ 32.760923] ? do_raw_spin_unlock+0x9e/0x2e0 [ 32.765313] ? __local_bh_enable_ip+0x161/0x230 [ 32.769963] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.774961] ? release_sock+0x1e2/0x2b0 [ 32.778914] ? trace_hardirqs_on+0xd/0x10 [ 32.783044] ? __local_bh_enable_ip+0x161/0x230 [ 32.787695] ? _raw_spin_unlock_bh+0x30/0x40 [ 32.792084] ? release_sock+0x1e2/0x2b0 [ 32.796050] ? __release_sock+0x3a0/0x3a0 [ 32.800190] ? __local_bh_enable_ip+0x161/0x230 [ 32.804843] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 32.810024] ? smc_setsockopt+0x1ed/0x630 [ 32.814164] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.819683] ? __sys_setsockopt+0x24f/0x390 [ 32.823988] do_group_exit+0x16f/0x430 [ 32.827861] ? mm_fault_error+0x380/0x380 [ 32.831989] ? __ia32_sys_exit+0x50/0x50 [ 32.836048] ? do_syscall_64+0x92/0x800 [ 32.840017] __x64_sys_exit_group+0x3e/0x50 [ 32.844340] do_syscall_64+0x1b1/0x800 [ 32.848209] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.853119] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.858042] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 32.863390] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.868217] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.873385] RIP: 0033:0x43e8d8 [ 32.876554] RSP: 002b:00007ffe8edee5f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 32.884243] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 32.891490] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 32.898741] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 32.905992] R10: 0000000020000080 R11: 0000000000000246 R12: 0000000000000001 [ 32.913248] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 32.921130] Dumping ftrace buffer: [ 32.924740] (ftrace buffer empty) [ 32.928430] Kernel Offset: disabled [ 32.932037] Rebooting in 86400 seconds..