[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.644143] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.676576] random: sshd: uninitialized urandom read (32 bytes read) [ 25.188187] random: sshd: uninitialized urandom read (32 bytes read) [ 25.967795] random: sshd: uninitialized urandom read (32 bytes read) [ 34.048472] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.3' (ECDSA) to the list of known hosts. [ 39.499556] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 39.594168] WARNING: CPU: 0 PID: 4516 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 39.602603] Kernel panic - not syncing: panic_on_warn set ... [ 39.602603] [ 39.609950] CPU: 0 PID: 4516 Comm: syz-executor934 Not tainted 4.17.0-rc4+ #47 [ 39.617283] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.626613] Call Trace: [ 39.629184] dump_stack+0x1b9/0x294 [ 39.632793] ? dump_stack_print_info.cold.2+0x52/0x52 [ 39.637965] ? smc_unhash_sk+0x310/0x4a0 [ 39.642006] panic+0x22f/0x4de [ 39.645177] ? add_taint.cold.5+0x16/0x16 [ 39.649306] ? __warn.cold.8+0x148/0x1b3 [ 39.653345] ? __warn.cold.8+0x117/0x1b3 [ 39.657385] ? smc_unhash_sk+0x345/0x4a0 [ 39.661425] __warn.cold.8+0x163/0x1b3 [ 39.665293] ? smc_unhash_sk+0x345/0x4a0 [ 39.669335] report_bug+0x252/0x2d0 [ 39.672944] do_error_trap+0x1de/0x490 [ 39.676807] ? graph_lock+0x170/0x170 [ 39.680589] ? math_error+0x420/0x420 [ 39.684371] ? lock_acquire+0x1dc/0x520 [ 39.688328] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.693153] do_invalid_op+0x1b/0x20 [ 39.696852] invalid_op+0x14/0x20 [ 39.700639] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 39.705285] RSP: 0018:ffff8801ae37f488 EFLAGS: 00010293 [ 39.710631] RAX: ffff8801d97b84c0 RBX: ffff8801d92f37c0 RCX: ffffffff8740e77e [ 39.717879] RDX: 0000000000000000 RSI: ffffffff8740e835 RDI: 0000000000000005 [ 39.725129] RBP: ffff8801ae37f570 R08: ffff8801d97b84c0 R09: ffffed003b25e708 [ 39.732394] R10: ffffed003b25e708 R11: ffff8801d92f3843 R12: 1ffff10035c6fe95 [ 39.739646] R13: ffff8801ae37f548 R14: ffffffff8970d520 R15: ffff8801d92f3840 [ 39.746908] ? smc_unhash_sk+0x28e/0x4a0 [ 39.750951] ? smc_unhash_sk+0x345/0x4a0 [ 39.754993] ? smc_unhash_sk+0x345/0x4a0 [ 39.759035] ? smc_rx_data_available+0x100/0x100 [ 39.763773] ? release_sock+0x1e2/0x2b0 [ 39.767730] ? __local_bh_enable_ip+0x161/0x230 [ 39.772377] ? __release_sock+0x3a0/0x3a0 [ 39.776503] ? smc_release+0x269/0x610 [ 39.780370] ? trace_hardirqs_on+0xd/0x10 [ 39.784496] ? __local_bh_enable_ip+0x161/0x230 [ 39.789153] smc_release+0x36e/0x610 [ 39.792850] sock_release+0x96/0x1b0 [ 39.796542] ? sock_alloc_file+0x4e0/0x4e0 [ 39.800770] sock_close+0x16/0x20 [ 39.804203] __fput+0x34d/0x890 [ 39.807465] ? fput+0x1a0/0x1a0 [ 39.810733] ? _raw_spin_unlock_irq+0x27/0x70 [ 39.815210] ____fput+0x15/0x20 [ 39.818473] task_work_run+0x1e4/0x290 [ 39.822340] ? task_work_cancel+0x240/0x240 [ 39.826642] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 39.832157] ? switch_task_namespaces+0xa2/0xd0 [ 39.836804] do_exit+0x1aee/0x2730 [ 39.840326] ? mm_update_next_owner+0x980/0x980 [ 39.844972] ? lock_downgrade+0x8e0/0x8e0 [ 39.849095] ? noop_count+0x40/0x40 [ 39.852699] ? lock_pin_lock+0x350/0x350 [ 39.856740] ? kasan_check_read+0x11/0x20 [ 39.860867] ? rcu_is_watching+0x85/0x140 [ 39.864992] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 39.870162] ? is_bpf_text_address+0xd7/0x170 [ 39.874635] ? check_usage_backwards+0x151/0x3a0 [ 39.879382] ? graph_lock+0x170/0x170 [ 39.883159] ? graph_lock+0x170/0x170 [ 39.886942] ? find_held_lock+0x36/0x1c0 [ 39.890983] ? lock_downgrade+0x8e0/0x8e0 [ 39.895110] ? kasan_check_read+0x11/0x20 [ 39.899237] ? do_raw_spin_unlock+0x9e/0x2e0 [ 39.903624] ? __local_bh_enable_ip+0x161/0x230 [ 39.908270] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 39.913263] ? release_sock+0x1e2/0x2b0 [ 39.917213] ? trace_hardirqs_on+0xd/0x10 [ 39.921339] ? __local_bh_enable_ip+0x161/0x230 [ 39.925985] ? _raw_spin_unlock_bh+0x30/0x40 [ 39.930371] ? release_sock+0x1e2/0x2b0 [ 39.934323] ? __release_sock+0x3a0/0x3a0 [ 39.938450] ? __local_bh_enable_ip+0x161/0x230 [ 39.943100] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 39.948268] ? smc_setsockopt+0x1ed/0x6d0 [ 39.952414] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.957936] ? __sys_setsockopt+0x24f/0x390 [ 39.962239] do_group_exit+0x16f/0x430 [ 39.966107] ? mm_fault_error+0x380/0x380 [ 39.970233] ? __ia32_sys_exit+0x50/0x50 [ 39.974275] ? do_syscall_64+0x92/0x800 [ 39.978230] __x64_sys_exit_group+0x3e/0x50 [ 39.982531] do_syscall_64+0x1b1/0x800 [ 39.986402] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 39.991228] ? syscall_return_slowpath+0x5c0/0x5c0 [ 39.996142] ? syscall_return_slowpath+0x30f/0x5c0 [ 40.001058] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 40.006406] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 40.011237] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 40.016406] RIP: 0033:0x43e8b8 [ 40.019586] RSP: 002b:00007ffd0d8638b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 40.027272] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8b8 [ 40.034523] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 40.041773] RBP: 00000000004be260 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 40.049037] R10: 0000000020000080 R11: 0000000000000246 R12: 0000000000000001 [ 40.056285] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 40.064072] Dumping ftrace buffer: [ 40.067699] (ftrace buffer empty) [ 40.071390] Kernel Offset: disabled [ 40.075011] Rebooting in 86400 seconds..