[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.860465] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.091320] random: sshd: uninitialized urandom read (32 bytes read) [ 23.409930] random: sshd: uninitialized urandom read (32 bytes read) [ 24.225732] random: sshd: uninitialized urandom read (32 bytes read) [ 24.405509] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.63' (ECDSA) to the list of known hosts. [ 29.849219] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.942649] WARNING: CPU: 0 PID: 4535 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 29.951713] Kernel panic - not syncing: panic_on_warn set ... [ 29.951713] [ 29.959076] CPU: 0 PID: 4535 Comm: syz-executor118 Not tainted 4.17.0-rc4+ #55 [ 29.966417] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.975761] Call Trace: [ 29.978342] dump_stack+0x1b9/0x294 [ 29.981986] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.987206] ? smc_unhash_sk+0x340/0x4a0 [ 29.991254] panic+0x22f/0x4de [ 29.994459] ? add_taint.cold.5+0x16/0x16 [ 29.998612] ? __warn.cold.8+0x148/0x1b3 [ 30.002665] ? __warn.cold.8+0x117/0x1b3 [ 30.006717] ? smc_unhash_sk+0x345/0x4a0 [ 30.010760] __warn.cold.8+0x163/0x1b3 [ 30.014639] ? smc_unhash_sk+0x345/0x4a0 [ 30.018783] report_bug+0x252/0x2d0 [ 30.022396] do_error_trap+0x1de/0x490 [ 30.026272] ? graph_lock+0x170/0x170 [ 30.030069] ? math_error+0x420/0x420 [ 30.033864] ? lock_acquire+0x1dc/0x520 [ 30.037828] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.042669] do_invalid_op+0x1b/0x20 [ 30.046368] invalid_op+0x14/0x20 [ 30.049802] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 30.054446] RSP: 0018:ffff8801d932f488 EFLAGS: 00010293 [ 30.059803] RAX: ffff8801d9320680 RBX: ffff8801ad2f47c0 RCX: ffffffff8740fd4e [ 30.067057] RDX: 0000000000000000 RSI: ffffffff8740fe05 RDI: 0000000000000005 [ 30.074312] RBP: ffff8801d932f570 R08: ffff8801d9320680 R09: ffffed0035a5e908 [ 30.081584] R10: ffffed0035a5e908 R11: ffff8801ad2f4843 R12: 1ffff1003b265e95 [ 30.088845] R13: ffff8801d932f548 R14: ffffffff8970dd60 R15: ffff8801ad2f4840 [ 30.096126] ? smc_unhash_sk+0x28e/0x4a0 [ 30.100199] ? smc_unhash_sk+0x345/0x4a0 [ 30.104266] ? smc_unhash_sk+0x345/0x4a0 [ 30.108324] ? smc_rx_data_available+0x100/0x100 [ 30.113085] ? release_sock+0x1e2/0x2b0 [ 30.117075] ? __local_bh_enable_ip+0x161/0x230 [ 30.121746] ? __release_sock+0x3a0/0x3a0 [ 30.125901] ? smc_release+0x269/0x610 [ 30.129782] ? trace_hardirqs_on+0xd/0x10 [ 30.133916] ? __local_bh_enable_ip+0x161/0x230 [ 30.138579] smc_release+0x36e/0x610 [ 30.142285] sock_release+0x96/0x1b0 [ 30.146007] ? sock_alloc_file+0x4e0/0x4e0 [ 30.150327] sock_close+0x16/0x20 [ 30.153774] __fput+0x34d/0x890 [ 30.157050] ? fput+0x1a0/0x1a0 [ 30.160326] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.165251] ____fput+0x15/0x20 [ 30.168524] task_work_run+0x1e4/0x290 [ 30.172395] ? task_work_cancel+0x240/0x240 [ 30.176703] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.182222] ? switch_task_namespaces+0xa2/0xd0 [ 30.186892] do_exit+0x1aee/0x2730 [ 30.190424] ? mm_update_next_owner+0x980/0x980 [ 30.195088] ? ___sys_sendmsg+0x31a/0x940 [ 30.199225] ? rcu_read_lock_sched_held+0x108/0x120 [ 30.204236] ? kfree+0x1e9/0x260 [ 30.207603] ? ___sys_sendmsg+0x31f/0x940 [ 30.211774] ? copy_msghdr_from_user+0x560/0x560 [ 30.216537] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.221559] ? graph_lock+0x170/0x170 [ 30.225350] ? pud_val+0x80/0xf0 [ 30.228703] ? pmd_val+0xf0/0xf0 [ 30.232061] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.237585] ? __fget_light+0x2ef/0x430 [ 30.241557] ? __handle_mm_fault+0x93a/0x4310 [ 30.246066] ? fget_raw+0x20/0x20 [ 30.249517] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 30.254256] ? graph_lock+0x170/0x170 [ 30.258059] ? graph_lock+0x170/0x170 [ 30.261849] ? find_held_lock+0x36/0x1c0 [ 30.265934] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.271493] ? sockfd_lookup_light+0xc5/0x160 [ 30.275997] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.281526] ? __sys_sendmmsg+0x4b3/0x6f0 [ 30.285663] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 30.289995] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.295537] ? __handle_mm_fault+0x4310/0x4310 [ 30.300135] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.305672] ? __do_page_fault+0x441/0xe40 [ 30.309919] do_group_exit+0x16f/0x430 [ 30.313818] ? mm_fault_error+0x380/0x380 [ 30.318065] ? __ia32_sys_exit+0x50/0x50 [ 30.322138] ? do_syscall_64+0x92/0x800 [ 30.326104] __x64_sys_exit_group+0x3e/0x50 [ 30.330412] do_syscall_64+0x1b1/0x800 [ 30.334284] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 30.339128] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.344050] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.348974] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.354325] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.359154] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.364323] RIP: 0033:0x43ed48 [ 30.367578] RSP: 002b:00007fff8b42f5e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 30.375268] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ed48 [ 30.382703] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 30.389975] RBP: 00000000004be6e0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 30.397244] R10: 0000000020000014 R11: 0000000000000246 R12: 0000000000000001 [ 30.404779] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 30.412939] Dumping ftrace buffer: [ 30.416632] (ftrace buffer empty) [ 30.420322] Kernel Offset: disabled [ 30.423935] Rebooting in 86400 seconds..