[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.211917] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.721308] random: sshd: uninitialized urandom read (32 bytes read) [ 25.115075] random: sshd: uninitialized urandom read (32 bytes read) [ 25.853614] random: sshd: uninitialized urandom read (32 bytes read) [ 26.016076] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.59' (ECDSA) to the list of known hosts. [ 31.576595] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.669745] WARNING: CPU: 1 PID: 4513 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 31.678161] Kernel panic - not syncing: panic_on_warn set ... [ 31.678161] [ 31.685538] CPU: 1 PID: 4513 Comm: syz-executor998 Not tainted 4.17.0-rc3+ #37 [ 31.692879] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.702226] Call Trace: [ 31.704817] dump_stack+0x1b9/0x294 [ 31.708452] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.713637] ? smc_unhash_sk+0x320/0x4a0 [ 31.717684] panic+0x22f/0x4de [ 31.720859] ? add_taint.cold.5+0x16/0x16 [ 31.724993] ? __warn.cold.8+0x148/0x1b3 [ 31.729046] ? __warn.cold.8+0x117/0x1b3 [ 31.733096] ? smc_unhash_sk+0x345/0x4a0 [ 31.737173] __warn.cold.8+0x163/0x1b3 [ 31.741065] ? smc_unhash_sk+0x345/0x4a0 [ 31.745119] report_bug+0x252/0x2d0 [ 31.748733] do_error_trap+0x1de/0x490 [ 31.752613] ? graph_lock+0x170/0x170 [ 31.756413] ? math_error+0x420/0x420 [ 31.760235] ? lock_acquire+0x1dc/0x520 [ 31.764212] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.769055] do_invalid_op+0x1b/0x20 [ 31.772754] invalid_op+0x14/0x20 [ 31.776190] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 31.780847] RSP: 0018:ffff8801c0157488 EFLAGS: 00010293 [ 31.786193] RAX: ffff8801ada962c0 RBX: ffff8801ad4207c0 RCX: ffffffff873f756e [ 31.793452] RDX: 0000000000000000 RSI: ffffffff873f7625 RDI: 0000000000000005 [ 31.801319] RBP: ffff8801c0157570 R08: ffff8801ada962c0 R09: ffffed0035a84108 [ 31.808572] R10: ffffed0035a84108 R11: ffff8801ad420843 R12: 1ffff1003802ae95 [ 31.815825] R13: ffff8801c0157548 R14: ffffffff8970b1e0 R15: ffff8801ad420840 [ 31.823086] ? smc_unhash_sk+0x28e/0x4a0 [ 31.827133] ? smc_unhash_sk+0x345/0x4a0 [ 31.831176] ? smc_unhash_sk+0x345/0x4a0 [ 31.835220] ? smc_rx_data_available+0x100/0x100 [ 31.839969] ? release_sock+0x1e2/0x2b0 [ 31.843924] ? __local_bh_enable_ip+0x161/0x230 [ 31.848587] ? __release_sock+0x3a0/0x3a0 [ 31.852718] ? smc_release+0x269/0x610 [ 31.856587] ? trace_hardirqs_on+0xd/0x10 [ 31.860730] ? __local_bh_enable_ip+0x161/0x230 [ 31.865382] smc_release+0x36e/0x610 [ 31.869098] sock_release+0x96/0x1b0 [ 31.872800] ? sock_alloc_file+0x4e0/0x4e0 [ 31.877038] sock_close+0x16/0x20 [ 31.880478] __fput+0x34d/0x890 [ 31.883749] ? fput+0x1a0/0x1a0 [ 31.887021] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.891517] ____fput+0x15/0x20 [ 31.894788] task_work_run+0x1e4/0x290 [ 31.898662] ? task_work_cancel+0x240/0x240 [ 31.902967] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.908497] ? switch_task_namespaces+0xa2/0xd0 [ 31.913150] do_exit+0x1aee/0x2730 [ 31.916685] ? mm_update_next_owner+0x980/0x980 [ 31.921335] ? lock_downgrade+0x8e0/0x8e0 [ 31.925464] ? noop_count+0x40/0x40 [ 31.929073] ? lock_pin_lock+0x350/0x350 [ 31.933145] ? kasan_check_read+0x11/0x20 [ 31.937294] ? rcu_is_watching+0x85/0x140 [ 31.941425] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 31.946598] ? is_bpf_text_address+0xd7/0x170 [ 31.951079] ? check_usage_backwards+0x151/0x3a0 [ 31.955821] ? graph_lock+0x170/0x170 [ 31.959614] ? graph_lock+0x170/0x170 [ 31.963403] ? find_held_lock+0x36/0x1c0 [ 31.967452] ? lock_downgrade+0x8e0/0x8e0 [ 31.971589] ? kasan_check_read+0x11/0x20 [ 31.975732] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.980124] ? __local_bh_enable_ip+0x161/0x230 [ 31.984789] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.989793] ? release_sock+0x1e2/0x2b0 [ 31.993759] ? trace_hardirqs_on+0xd/0x10 [ 31.997892] ? __local_bh_enable_ip+0x161/0x230 [ 32.002559] ? _raw_spin_unlock_bh+0x30/0x40 [ 32.006953] ? release_sock+0x1e2/0x2b0 [ 32.010911] ? __release_sock+0x3a0/0x3a0 [ 32.015044] ? __local_bh_enable_ip+0x161/0x230 [ 32.019714] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 32.024888] ? smc_setsockopt+0x1ed/0x630 [ 32.029032] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.034554] ? __sys_setsockopt+0x24f/0x390 [ 32.038873] do_group_exit+0x16f/0x430 [ 32.042746] ? mm_fault_error+0x380/0x380 [ 32.046879] ? __ia32_sys_exit+0x50/0x50 [ 32.050927] ? do_syscall_64+0x92/0x800 [ 32.054885] __x64_sys_exit_group+0x3e/0x50 [ 32.059200] do_syscall_64+0x1b1/0x800 [ 32.063106] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 32.068207] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.073121] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.078058] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 32.083439] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.088278] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.093446] RIP: 0033:0x43e8d8 [ 32.096617] RSP: 002b:00007ffcde7862c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 32.104335] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 32.111585] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 32.118835] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 32.126291] R10: 0000000020000080 R11: 0000000000000246 R12: 0000000000000001 [ 32.133556] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 32.141662] Dumping ftrace buffer: [ 32.145310] (ftrace buffer empty) [ 32.149014] Kernel Offset: disabled [ 32.152643] Rebooting in 86400 seconds..