[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.817868] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.776616] random: sshd: uninitialized urandom read (32 bytes read) [ 24.109871] random: sshd: uninitialized urandom read (32 bytes read) [ 24.824262] random: sshd: uninitialized urandom read (32 bytes read) [ 24.985159] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.20' (ECDSA) to the list of known hosts. [ 30.453125] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.543058] WARNING: CPU: 1 PID: 4500 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 30.551430] Kernel panic - not syncing: panic_on_warn set ... [ 30.551430] [ 30.558771] CPU: 1 PID: 4500 Comm: syz-executor709 Not tainted 4.17.0-rc3+ #33 [ 30.566103] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.575432] Call Trace: [ 30.578001] dump_stack+0x1b9/0x294 [ 30.581625] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.586804] ? smc_unhash_sk+0x270/0x4a0 [ 30.590842] panic+0x22f/0x4de [ 30.594015] ? add_taint.cold.5+0x16/0x16 [ 30.598149] ? __warn.cold.8+0x148/0x1b3 [ 30.602185] ? __warn.cold.8+0x117/0x1b3 [ 30.606232] ? smc_unhash_sk+0x345/0x4a0 [ 30.610269] __warn.cold.8+0x163/0x1b3 [ 30.614135] ? smc_unhash_sk+0x345/0x4a0 [ 30.618174] report_bug+0x252/0x2d0 [ 30.621779] do_error_trap+0x1de/0x490 [ 30.625642] ? graph_lock+0x170/0x170 [ 30.629420] ? math_error+0x420/0x420 [ 30.633201] ? lock_acquire+0x1dc/0x520 [ 30.637155] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.641977] do_invalid_op+0x1b/0x20 [ 30.645671] invalid_op+0x14/0x20 [ 30.649106] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 30.653747] RSP: 0018:ffff8801ad687488 EFLAGS: 00010293 [ 30.659095] RAX: ffff8801d96ac100 RBX: ffff8801ae35e7c0 RCX: ffffffff873fe71e [ 30.666347] RDX: 0000000000000000 RSI: ffffffff873fe7d5 RDI: 0000000000000005 [ 30.673594] RBP: ffff8801ad687570 R08: ffff8801d96ac100 R09: ffffed0035c6bd08 [ 30.680839] R10: ffffed0035c6bd08 R11: ffff8801ae35e843 R12: 1ffff10035ad0e95 [ 30.688087] R13: ffff8801ad687548 R14: ffffffff8970e4e0 R15: ffff8801ae35e840 [ 30.695352] ? smc_unhash_sk+0x28e/0x4a0 [ 30.699390] ? smc_unhash_sk+0x345/0x4a0 [ 30.703431] ? smc_unhash_sk+0x345/0x4a0 [ 30.707473] ? smc_rx_data_available+0x100/0x100 [ 30.712208] ? release_sock+0x1e2/0x2b0 [ 30.716165] ? __local_bh_enable_ip+0x161/0x230 [ 30.720811] ? __release_sock+0x3a0/0x3a0 [ 30.724938] ? smc_release+0x269/0x610 [ 30.728801] ? trace_hardirqs_on+0xd/0x10 [ 30.732927] ? __local_bh_enable_ip+0x161/0x230 [ 30.737574] smc_release+0x36e/0x610 [ 30.741268] sock_release+0x96/0x1b0 [ 30.744961] ? sock_alloc_file+0x4e0/0x4e0 [ 30.749172] sock_close+0x16/0x20 [ 30.752618] __fput+0x34d/0x890 [ 30.755876] ? fput+0x1a0/0x1a0 [ 30.759134] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.763611] ____fput+0x15/0x20 [ 30.766870] task_work_run+0x1e4/0x290 [ 30.770739] ? task_work_cancel+0x240/0x240 [ 30.775044] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.780558] ? switch_task_namespaces+0xa2/0xd0 [ 30.785209] do_exit+0x1aee/0x2730 [ 30.788725] ? _raw_spin_unlock_bh+0x30/0x40 [ 30.793114] ? mm_update_next_owner+0x980/0x980 [ 30.797765] ? ___sys_sendmsg+0x31a/0x940 [ 30.801890] ? rcu_read_lock_sched_held+0x108/0x120 [ 30.806883] ? kfree+0x1e9/0x260 [ 30.810227] ? ___sys_sendmsg+0x31f/0x940 [ 30.814376] ? copy_msghdr_from_user+0x560/0x560 [ 30.819122] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.824116] ? graph_lock+0x170/0x170 [ 30.827896] ? pud_val+0x80/0xf0 [ 30.831237] ? pmd_val+0xf0/0xf0 [ 30.834587] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.840100] ? __fget_light+0x2ef/0x430 [ 30.844054] ? __handle_mm_fault+0x93a/0x4310 [ 30.848533] ? fget_raw+0x20/0x20 [ 30.851965] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 30.856695] ? graph_lock+0x170/0x170 [ 30.860482] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.866018] ? sockfd_lookup_light+0xc5/0x160 [ 30.870511] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.876030] ? __sys_sendmmsg+0x4b3/0x6f0 [ 30.880158] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 30.884459] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.889980] ? __handle_mm_fault+0x4310/0x4310 [ 30.894544] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.900059] ? __do_page_fault+0x441/0xe40 [ 30.904276] do_group_exit+0x16f/0x430 [ 30.908140] ? mm_fault_error+0x380/0x380 [ 30.912266] ? __ia32_sys_exit+0x50/0x50 [ 30.916309] ? do_syscall_64+0x92/0x800 [ 30.920275] __x64_sys_exit_group+0x3e/0x50 [ 30.924577] do_syscall_64+0x1b1/0x800 [ 30.928450] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.933356] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.938268] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.943611] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.948434] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.953602] RIP: 0033:0x43f4f8 [ 30.956768] RSP: 002b:00007ffe6cbfa9c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 30.964453] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043f4f8 [ 30.971704] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 30.978948] RBP: 00000000004beea0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 30.986196] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 30.993452] R13: 00000000006cd160 R14: 0000000000000000 R15: 0000000000000000 [ 31.001272] Dumping ftrace buffer: [ 31.004865] (ftrace buffer empty) [ 31.008550] Kernel Offset: disabled [ 31.012158] Rebooting in 86400 seconds..