[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.695787] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.579826] random: sshd: uninitialized urandom read (32 bytes read) [ 24.980590] random: sshd: uninitialized urandom read (32 bytes read) [ 25.735852] random: sshd: uninitialized urandom read (32 bytes read) [ 25.917735] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.37' (ECDSA) to the list of known hosts. [ 31.378455] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.469933] WARNING: CPU: 0 PID: 4551 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 31.478423] Kernel panic - not syncing: panic_on_warn set ... [ 31.478423] [ 31.485774] CPU: 0 PID: 4551 Comm: syz-executor695 Not tainted 4.17.0-rc4+ #46 [ 31.493117] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.502449] Call Trace: [ 31.505028] dump_stack+0x1b9/0x294 [ 31.509252] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.514436] ? smc_unhash_sk+0x330/0x4a0 [ 31.518485] panic+0x22f/0x4de [ 31.521663] ? add_taint.cold.5+0x16/0x16 [ 31.525798] ? __warn.cold.8+0x148/0x1b3 [ 31.529839] ? __warn.cold.8+0x117/0x1b3 [ 31.533889] ? smc_unhash_sk+0x345/0x4a0 [ 31.537933] __warn.cold.8+0x163/0x1b3 [ 31.541806] ? smc_unhash_sk+0x345/0x4a0 [ 31.545850] report_bug+0x252/0x2d0 [ 31.549466] do_error_trap+0x1de/0x490 [ 31.553340] ? graph_lock+0x170/0x170 [ 31.557125] ? math_error+0x420/0x420 [ 31.560921] ? lock_acquire+0x1dc/0x520 [ 31.564883] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.569711] do_invalid_op+0x1b/0x20 [ 31.573424] invalid_op+0x14/0x20 [ 31.576866] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 31.581520] RSP: 0018:ffff8801ad1ef488 EFLAGS: 00010293 [ 31.586873] RAX: ffff8801ac4ac0c0 RBX: ffff8801ac5407c0 RCX: ffffffff8740565e [ 31.594130] RDX: 0000000000000000 RSI: ffffffff87405715 RDI: 0000000000000005 [ 31.601383] RBP: ffff8801ad1ef570 R08: ffff8801ac4ac0c0 R09: ffffed00358a8108 [ 31.608633] R10: ffffed00358a8108 R11: ffff8801ac540843 R12: 1ffff10035a3de95 [ 31.615899] R13: ffff8801ad1ef548 R14: ffffffff8970cba0 R15: ffff8801ac540840 [ 31.623898] ? smc_unhash_sk+0x28e/0x4a0 [ 31.627941] ? smc_unhash_sk+0x345/0x4a0 [ 31.631990] ? smc_unhash_sk+0x345/0x4a0 [ 31.636037] ? smc_rx_data_available+0x100/0x100 [ 31.640780] ? release_sock+0x1e2/0x2b0 [ 31.644739] ? __local_bh_enable_ip+0x161/0x230 [ 31.649388] ? __release_sock+0x3a0/0x3a0 [ 31.653520] ? smc_release+0x269/0x610 [ 31.657388] ? trace_hardirqs_on+0xd/0x10 [ 31.661522] ? __local_bh_enable_ip+0x161/0x230 [ 31.666195] smc_release+0x36e/0x610 [ 31.669901] sock_release+0x96/0x1b0 [ 31.673604] ? sock_alloc_file+0x4e0/0x4e0 [ 31.677823] sock_close+0x16/0x20 [ 31.681265] __fput+0x34d/0x890 [ 31.684525] ? fput+0x1a0/0x1a0 [ 31.687801] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.692283] ____fput+0x15/0x20 [ 31.695723] task_work_run+0x1e4/0x290 [ 31.699592] ? task_work_cancel+0x240/0x240 [ 31.703896] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.709413] ? switch_task_namespaces+0xa2/0xd0 [ 31.714064] do_exit+0x1aee/0x2730 [ 31.717585] ? mm_update_next_owner+0x980/0x980 [ 31.722231] ? lock_downgrade+0x8e0/0x8e0 [ 31.726356] ? noop_count+0x40/0x40 [ 31.729965] ? lock_pin_lock+0x350/0x350 [ 31.734011] ? kasan_check_read+0x11/0x20 [ 31.738151] ? rcu_is_watching+0x85/0x140 [ 31.742279] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 31.747450] ? is_bpf_text_address+0xd7/0x170 [ 31.751935] ? check_usage_backwards+0x151/0x3a0 [ 31.756680] ? graph_lock+0x170/0x170 [ 31.760466] ? graph_lock+0x170/0x170 [ 31.764262] ? find_held_lock+0x36/0x1c0 [ 31.768310] ? lock_downgrade+0x8e0/0x8e0 [ 31.772447] ? kasan_check_read+0x11/0x20 [ 31.776577] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.780978] ? __local_bh_enable_ip+0x161/0x230 [ 31.785811] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.790810] ? release_sock+0x1e2/0x2b0 [ 31.794763] ? trace_hardirqs_on+0xd/0x10 [ 31.798891] ? __local_bh_enable_ip+0x161/0x230 [ 31.803543] ? _raw_spin_unlock_bh+0x30/0x40 [ 31.807954] ? release_sock+0x1e2/0x2b0 [ 31.811913] ? __release_sock+0x3a0/0x3a0 [ 31.816057] ? __local_bh_enable_ip+0x161/0x230 [ 31.820713] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 31.825885] ? smc_setsockopt+0x1ed/0x6d0 [ 31.830021] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.835551] ? __sys_setsockopt+0x24f/0x390 [ 31.839858] do_group_exit+0x16f/0x430 [ 31.843729] ? mm_fault_error+0x380/0x380 [ 31.847860] ? __ia32_sys_exit+0x50/0x50 [ 31.851911] ? do_syscall_64+0x92/0x800 [ 31.855876] __x64_sys_exit_group+0x3e/0x50 [ 31.860188] do_syscall_64+0x1b1/0x800 [ 31.864078] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.869111] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.874484] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.879837] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.884667] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.889944] RIP: 0033:0x43e8d8 [ 31.893112] RSP: 002b:00007ffffaa52ac8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 31.900800] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 31.908053] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 31.915300] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 31.922547] R10: 0000000020000200 R11: 0000000000000246 R12: 0000000000000001 [ 31.929811] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 31.937638] Dumping ftrace buffer: [ 31.941291] (ftrace buffer empty) [ 31.944982] Kernel Offset: disabled [ 31.948593] Rebooting in 86400 seconds..