[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.808875] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.285567] random: sshd: uninitialized urandom read (32 bytes read) [ 23.603433] random: sshd: uninitialized urandom read (32 bytes read) [ 24.371446] random: sshd: uninitialized urandom read (32 bytes read) [ 34.834120] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.40' (ECDSA) to the list of known hosts. [ 40.246738] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 40.336557] WARNING: CPU: 1 PID: 4534 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 40.344954] Kernel panic - not syncing: panic_on_warn set ... [ 40.344954] [ 40.352304] CPU: 1 PID: 4534 Comm: syz-executor113 Not tainted 4.17.0-rc4+ #41 [ 40.359647] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.368983] Call Trace: [ 40.371561] dump_stack+0x1b9/0x294 [ 40.375179] ? dump_stack_print_info.cold.2+0x52/0x52 [ 40.380366] ? smc_unhash_sk+0x2d0/0x4a0 [ 40.384421] panic+0x22f/0x4de [ 40.387595] ? add_taint.cold.5+0x16/0x16 [ 40.391732] ? __warn.cold.8+0x148/0x1b3 [ 40.395781] ? __warn.cold.8+0x117/0x1b3 [ 40.399834] ? smc_unhash_sk+0x345/0x4a0 [ 40.403895] __warn.cold.8+0x163/0x1b3 [ 40.407767] ? smc_unhash_sk+0x345/0x4a0 [ 40.411810] report_bug+0x252/0x2d0 [ 40.415421] do_error_trap+0x1de/0x490 [ 40.419292] ? graph_lock+0x170/0x170 [ 40.423080] ? math_error+0x420/0x420 [ 40.426879] ? lock_acquire+0x1dc/0x520 [ 40.430847] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 40.435687] do_invalid_op+0x1b/0x20 [ 40.439383] invalid_op+0x14/0x20 [ 40.442823] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 40.447474] RSP: 0018:ffff8801ac1f7488 EFLAGS: 00010293 [ 40.453696] RAX: ffff8801d9110400 RBX: ffff8801d97e87c0 RCX: ffffffff87404cbe [ 40.460950] RDX: 0000000000000000 RSI: ffffffff87404d75 RDI: 0000000000000005 [ 40.468219] RBP: ffff8801ac1f7570 R08: ffff8801d9110400 R09: ffffed003b2fd108 [ 40.475493] R10: ffffed003b2fd108 R11: ffff8801d97e8843 R12: 1ffff1003583ee95 [ 40.482768] R13: ffff8801ac1f7548 R14: ffffffff8970cc20 R15: ffff8801d97e8840 [ 40.490054] ? smc_unhash_sk+0x28e/0x4a0 [ 40.494100] ? smc_unhash_sk+0x345/0x4a0 [ 40.498157] ? smc_unhash_sk+0x345/0x4a0 [ 40.502226] ? smc_rx_data_available+0x100/0x100 [ 40.506990] ? release_sock+0x1e2/0x2b0 [ 40.510962] ? __local_bh_enable_ip+0x161/0x230 [ 40.515622] ? __release_sock+0x3a0/0x3a0 [ 40.519753] ? smc_release+0x269/0x610 [ 40.523622] ? trace_hardirqs_on+0xd/0x10 [ 40.527770] ? __local_bh_enable_ip+0x161/0x230 [ 40.532436] smc_release+0x36e/0x610 [ 40.536163] sock_release+0x96/0x1b0 [ 40.539886] ? sock_alloc_file+0x4e0/0x4e0 [ 40.544127] sock_close+0x16/0x20 [ 40.547576] __fput+0x34d/0x890 [ 40.550837] ? fput+0x1a0/0x1a0 [ 40.554101] ? _raw_spin_unlock_irq+0x27/0x70 [ 40.558581] ____fput+0x15/0x20 [ 40.561844] task_work_run+0x1e4/0x290 [ 40.565714] ? task_work_cancel+0x240/0x240 [ 40.570018] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 40.575539] ? switch_task_namespaces+0xa2/0xd0 [ 40.580190] do_exit+0x1aee/0x2730 [ 40.583723] ? mm_update_next_owner+0x980/0x980 [ 40.588372] ? lock_downgrade+0x8e0/0x8e0 [ 40.592513] ? noop_count+0x40/0x40 [ 40.596129] ? lock_pin_lock+0x350/0x350 [ 40.600181] ? kasan_check_read+0x11/0x20 [ 40.604308] ? rcu_is_watching+0x85/0x140 [ 40.608437] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 40.613611] ? is_bpf_text_address+0xd7/0x170 [ 40.618090] ? check_usage_backwards+0x151/0x3a0 [ 40.622826] ? graph_lock+0x170/0x170 [ 40.626614] ? graph_lock+0x170/0x170 [ 40.630405] ? find_held_lock+0x36/0x1c0 [ 40.634450] ? lock_downgrade+0x8e0/0x8e0 [ 40.638578] ? kasan_check_read+0x11/0x20 [ 40.642707] ? do_raw_spin_unlock+0x9e/0x2e0 [ 40.647105] ? __local_bh_enable_ip+0x161/0x230 [ 40.651759] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 40.657220] ? release_sock+0x1e2/0x2b0 [ 40.661183] ? trace_hardirqs_on+0xd/0x10 [ 40.665405] ? __local_bh_enable_ip+0x161/0x230 [ 40.670059] ? _raw_spin_unlock_bh+0x30/0x40 [ 40.674451] ? release_sock+0x1e2/0x2b0 [ 40.678405] ? __release_sock+0x3a0/0x3a0 [ 40.682534] ? __local_bh_enable_ip+0x161/0x230 [ 40.687186] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 40.692358] ? smc_setsockopt+0x1ed/0x630 [ 40.696491] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.702012] ? __sys_setsockopt+0x24f/0x390 [ 40.706326] do_group_exit+0x16f/0x430 [ 40.710285] ? mm_fault_error+0x380/0x380 [ 40.714426] ? __ia32_sys_exit+0x50/0x50 [ 40.718481] ? do_syscall_64+0x92/0x800 [ 40.722439] __x64_sys_exit_group+0x3e/0x50 [ 40.726757] do_syscall_64+0x1b1/0x800 [ 40.730626] ? syscall_return_slowpath+0x5c0/0x5c0 [ 40.735534] ? syscall_return_slowpath+0x30f/0x5c0 [ 40.740447] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 40.745794] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 40.750620] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 40.755795] RIP: 0033:0x43e8d8 [ 40.758964] RSP: 002b:00007ffe1a9fbd68 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 40.766660] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 40.773914] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 40.781163] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 40.788503] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 40.795753] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 40.803613] Dumping ftrace buffer: [ 40.807340] (ftrace buffer empty) [ 40.811031] Kernel Offset: disabled [ 40.814645] Rebooting in 86400 seconds..