[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.511619] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.441981] random: sshd: uninitialized urandom read (32 bytes read) [ 25.775189] random: sshd: uninitialized urandom read (32 bytes read) [ 26.524244] random: sshd: uninitialized urandom read (32 bytes read) [ 26.682850] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.0' (ECDSA) to the list of known hosts. [ 32.232853] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.326891] WARNING: CPU: 1 PID: 4515 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 32.335301] Kernel panic - not syncing: panic_on_warn set ... [ 32.335301] [ 32.342664] CPU: 1 PID: 4515 Comm: syz-executor582 Not tainted 4.17.0-rc3+ #36 [ 32.350007] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.359554] Call Trace: [ 32.362142] dump_stack+0x1b9/0x294 [ 32.365759] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.371204] ? smc_unhash_sk+0x320/0x4a0 [ 32.375251] panic+0x22f/0x4de [ 32.378445] ? add_taint.cold.5+0x16/0x16 [ 32.382577] ? __warn.cold.8+0x148/0x1b3 [ 32.386633] ? __warn.cold.8+0x117/0x1b3 [ 32.390685] ? smc_unhash_sk+0x345/0x4a0 [ 32.394733] __warn.cold.8+0x163/0x1b3 [ 32.398602] ? smc_unhash_sk+0x345/0x4a0 [ 32.402646] report_bug+0x252/0x2d0 [ 32.406257] do_error_trap+0x1de/0x490 [ 32.410123] ? graph_lock+0x170/0x170 [ 32.413905] ? math_error+0x420/0x420 [ 32.417688] ? lock_acquire+0x1dc/0x520 [ 32.421645] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.426483] do_invalid_op+0x1b/0x20 [ 32.430190] invalid_op+0x14/0x20 [ 32.433626] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 32.438271] RSP: 0018:ffff8801ae6af488 EFLAGS: 00010293 [ 32.443613] RAX: ffff8801b09e0500 RBX: ffff8801ae6027c0 RCX: ffffffff873f756e [ 32.450864] RDX: 0000000000000000 RSI: ffffffff873f7625 RDI: 0000000000000005 [ 32.458125] RBP: ffff8801ae6af570 R08: ffff8801b09e0500 R09: ffffed0035cc0508 [ 32.465391] R10: ffffed0035cc0508 R11: ffff8801ae602843 R12: 1ffff10035cd5e95 [ 32.472651] R13: ffff8801ae6af548 R14: ffffffff8970b1e0 R15: ffff8801ae602840 [ 32.479920] ? smc_unhash_sk+0x28e/0x4a0 [ 32.483967] ? smc_unhash_sk+0x345/0x4a0 [ 32.488022] ? smc_unhash_sk+0x345/0x4a0 [ 32.492074] ? smc_rx_data_available+0x100/0x100 [ 32.496818] ? release_sock+0x1e2/0x2b0 [ 32.500775] ? __local_bh_enable_ip+0x161/0x230 [ 32.505433] ? __release_sock+0x3a0/0x3a0 [ 32.509564] ? smc_release+0x269/0x610 [ 32.513434] ? trace_hardirqs_on+0xd/0x10 [ 32.517565] ? __local_bh_enable_ip+0x161/0x230 [ 32.522217] smc_release+0x36e/0x610 [ 32.525915] sock_release+0x96/0x1b0 [ 32.529616] ? sock_alloc_file+0x4e0/0x4e0 [ 32.533832] sock_close+0x16/0x20 [ 32.537272] __fput+0x34d/0x890 [ 32.540532] ? fput+0x1a0/0x1a0 [ 32.543798] ? _raw_spin_unlock_irq+0x27/0x70 [ 32.548277] ____fput+0x15/0x20 [ 32.551543] task_work_run+0x1e4/0x290 [ 32.555413] ? task_work_cancel+0x240/0x240 [ 32.559718] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 32.565234] ? switch_task_namespaces+0xa2/0xd0 [ 32.569894] do_exit+0x1aee/0x2730 [ 32.573421] ? mm_update_next_owner+0x980/0x980 [ 32.578070] ? lock_downgrade+0x8e0/0x8e0 [ 32.582197] ? noop_count+0x40/0x40 [ 32.585805] ? lock_pin_lock+0x350/0x350 [ 32.589860] ? kasan_check_read+0x11/0x20 [ 32.593989] ? rcu_is_watching+0x85/0x140 [ 32.598126] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 32.603302] ? is_bpf_text_address+0xd7/0x170 [ 32.607779] ? check_usage_backwards+0x151/0x3a0 [ 32.612516] ? graph_lock+0x170/0x170 [ 32.616295] ? graph_lock+0x170/0x170 [ 32.620079] ? find_held_lock+0x36/0x1c0 [ 32.624129] ? lock_downgrade+0x8e0/0x8e0 [ 32.628258] ? kasan_check_read+0x11/0x20 [ 32.632386] ? do_raw_spin_unlock+0x9e/0x2e0 [ 32.636776] ? __local_bh_enable_ip+0x161/0x230 [ 32.642123] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.647122] ? release_sock+0x1e2/0x2b0 [ 32.651076] ? trace_hardirqs_on+0xd/0x10 [ 32.655214] ? __local_bh_enable_ip+0x161/0x230 [ 32.659868] ? _raw_spin_unlock_bh+0x30/0x40 [ 32.664256] ? release_sock+0x1e2/0x2b0 [ 32.668211] ? __release_sock+0x3a0/0x3a0 [ 32.672344] ? __local_bh_enable_ip+0x161/0x230 [ 32.676995] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 32.682175] ? smc_setsockopt+0x1ed/0x630 [ 32.686316] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.691837] ? __sys_setsockopt+0x24f/0x390 [ 32.696142] do_group_exit+0x16f/0x430 [ 32.700027] ? mm_fault_error+0x380/0x380 [ 32.704158] ? __ia32_sys_exit+0x50/0x50 [ 32.708203] ? do_syscall_64+0x92/0x800 [ 32.712159] __x64_sys_exit_group+0x3e/0x50 [ 32.716464] do_syscall_64+0x1b1/0x800 [ 32.720343] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.725258] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.730178] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 32.735532] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.740374] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.745544] RIP: 0033:0x43e8d8 [ 32.748712] RSP: 002b:00007ffd9cfa4578 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 32.756405] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 32.763654] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 32.770907] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 32.778157] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 32.785409] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 32.793316] Dumping ftrace buffer: [ 32.797019] (ftrace buffer empty) [ 32.800714] Kernel Offset: disabled [ 32.804433] Rebooting in 86400 seconds..