[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.318752] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.939785] random: sshd: uninitialized urandom read (32 bytes read) [ 23.322360] random: sshd: uninitialized urandom read (32 bytes read) [ 24.115328] random: sshd: uninitialized urandom read (32 bytes read) [ 31.272530] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.13' (ECDSA) to the list of known hosts. [ 36.723672] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 36.820171] WARNING: CPU: 0 PID: 4468 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 36.828613] Kernel panic - not syncing: panic_on_warn set ... [ 36.828613] [ 36.835971] CPU: 0 PID: 4468 Comm: syz-executor573 Not tainted 4.17.0-rc4+ #41 [ 36.843311] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.852657] Call Trace: [ 36.855249] dump_stack+0x1b9/0x294 [ 36.858878] ? dump_stack_print_info.cold.2+0x52/0x52 [ 36.864058] ? smc_unhash_sk+0x2d0/0x4a0 [ 36.868104] panic+0x22f/0x4de [ 36.871287] ? add_taint.cold.5+0x16/0x16 [ 36.875430] ? __warn.cold.8+0x148/0x1b3 [ 36.879497] ? __warn.cold.8+0x117/0x1b3 [ 36.883563] ? smc_unhash_sk+0x345/0x4a0 [ 36.887613] __warn.cold.8+0x163/0x1b3 [ 36.891503] ? smc_unhash_sk+0x345/0x4a0 [ 36.895571] report_bug+0x252/0x2d0 [ 36.899203] do_error_trap+0x1de/0x490 [ 36.903090] ? graph_lock+0x170/0x170 [ 36.906918] ? math_error+0x420/0x420 [ 36.910732] ? lock_acquire+0x1dc/0x520 [ 36.914714] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.919552] do_invalid_op+0x1b/0x20 [ 36.923258] invalid_op+0x14/0x20 [ 36.926699] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 36.931346] RSP: 0018:ffff8801b3177488 EFLAGS: 00010293 [ 36.936696] RAX: ffff8801b307a380 RBX: ffff8801b3af97c0 RCX: ffffffff87404cbe [ 36.943959] RDX: 0000000000000000 RSI: ffffffff87404d75 RDI: 0000000000000005 [ 36.951214] RBP: ffff8801b3177570 R08: ffff8801b307a380 R09: ffffed003675f308 [ 36.958477] R10: ffffed003675f308 R11: ffff8801b3af9843 R12: 1ffff1003662ee95 [ 36.965738] R13: ffff8801b3177548 R14: ffffffff8970cc20 R15: ffff8801b3af9840 [ 36.973013] ? smc_unhash_sk+0x28e/0x4a0 [ 36.977065] ? smc_unhash_sk+0x345/0x4a0 [ 36.981113] ? smc_unhash_sk+0x345/0x4a0 [ 36.985167] ? smc_rx_data_available+0x100/0x100 [ 36.989916] ? release_sock+0x1e2/0x2b0 [ 36.993883] ? __local_bh_enable_ip+0x161/0x230 [ 36.998539] ? __release_sock+0x3a0/0x3a0 [ 37.002673] ? smc_release+0x269/0x610 [ 37.006549] ? trace_hardirqs_on+0xd/0x10 [ 37.010681] ? __local_bh_enable_ip+0x161/0x230 [ 37.015338] smc_release+0x36e/0x610 [ 37.019042] sock_release+0x96/0x1b0 [ 37.022743] ? sock_alloc_file+0x4e0/0x4e0 [ 37.026962] sock_close+0x16/0x20 [ 37.030397] __fput+0x34d/0x890 [ 37.033664] ? fput+0x1a0/0x1a0 [ 37.036932] ? _raw_spin_unlock_irq+0x27/0x70 [ 37.041431] ____fput+0x15/0x20 [ 37.044713] task_work_run+0x1e4/0x290 [ 37.048588] ? task_work_cancel+0x240/0x240 [ 37.052899] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 37.058425] ? switch_task_namespaces+0xa2/0xd0 [ 37.063082] do_exit+0x1aee/0x2730 [ 37.066609] ? mm_update_next_owner+0x980/0x980 [ 37.071262] ? lock_downgrade+0x8e0/0x8e0 [ 37.075394] ? noop_count+0x40/0x40 [ 37.079012] ? lock_pin_lock+0x350/0x350 [ 37.083070] ? kasan_check_read+0x11/0x20 [ 37.087204] ? rcu_is_watching+0x85/0x140 [ 37.091346] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 37.096541] ? is_bpf_text_address+0xd7/0x170 [ 37.101030] ? check_usage_backwards+0x151/0x3a0 [ 37.105790] ? graph_lock+0x170/0x170 [ 37.109595] ? graph_lock+0x170/0x170 [ 37.113387] ? find_held_lock+0x36/0x1c0 [ 37.117440] ? lock_downgrade+0x8e0/0x8e0 [ 37.121582] ? kasan_check_read+0x11/0x20 [ 37.125718] ? do_raw_spin_unlock+0x9e/0x2e0 [ 37.130111] ? __local_bh_enable_ip+0x161/0x230 [ 37.134764] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 37.139769] ? release_sock+0x1e2/0x2b0 [ 37.143730] ? trace_hardirqs_on+0xd/0x10 [ 37.147864] ? __local_bh_enable_ip+0x161/0x230 [ 37.152532] ? _raw_spin_unlock_bh+0x30/0x40 [ 37.156930] ? release_sock+0x1e2/0x2b0 [ 37.160890] ? __release_sock+0x3a0/0x3a0 [ 37.165027] ? __local_bh_enable_ip+0x161/0x230 [ 37.169684] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 37.174865] ? smc_setsockopt+0x1ed/0x630 [ 37.179002] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.184525] ? __sys_setsockopt+0x24f/0x390 [ 37.188840] do_group_exit+0x16f/0x430 [ 37.192741] ? mm_fault_error+0x380/0x380 [ 37.196894] ? __ia32_sys_exit+0x50/0x50 [ 37.200950] ? do_syscall_64+0x92/0x800 [ 37.204923] __x64_sys_exit_group+0x3e/0x50 [ 37.209244] do_syscall_64+0x1b1/0x800 [ 37.213122] ? syscall_return_slowpath+0x5c0/0x5c0 [ 37.218040] ? syscall_return_slowpath+0x30f/0x5c0 [ 37.222961] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 37.228315] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.233144] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 37.238319] RIP: 0033:0x43e8d8 [ 37.241493] RSP: 002b:00007ffe8439c0f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 37.249190] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 37.256459] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 37.263716] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 37.270966] R10: 0000000020000040 R11: 0000000000000246 R12: 0000000000000001 [ 37.278216] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 37.286084] Dumping ftrace buffer: [ 37.289857] (ftrace buffer empty) [ 37.293692] Kernel Offset: disabled [ 37.297883] Rebooting in 86400 seconds..