[....] Starting OpenBSD Secure Shell server: sshd[ 19.448181] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.197618] random: sshd: uninitialized urandom read (32 bytes read) [ 23.439948] random: sshd: uninitialized urandom read (32 bytes read) [ 24.167768] sshd (4485) used greatest stack depth: 16840 bytes left [ 24.187886] random: sshd: uninitialized urandom read (32 bytes read) [ 24.342531] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.45' (ECDSA) to the list of known hosts. [ 29.844968] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.935131] WARNING: CPU: 1 PID: 4498 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 29.943514] Kernel panic - not syncing: panic_on_warn set ... [ 29.943514] [ 29.950861] CPU: 1 PID: 4498 Comm: syz-executor783 Not tainted 4.17.0-rc3+ #37 [ 29.958194] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.967522] Call Trace: [ 29.970089] dump_stack+0x1b9/0x294 [ 29.973700] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.978873] ? smc_unhash_sk+0x320/0x4a0 [ 29.982912] panic+0x22f/0x4de [ 29.986107] ? add_taint.cold.5+0x16/0x16 [ 29.990234] ? __warn.cold.8+0x148/0x1b3 [ 29.994269] ? __warn.cold.8+0x117/0x1b3 [ 29.998307] ? smc_unhash_sk+0x345/0x4a0 [ 30.002347] __warn.cold.8+0x163/0x1b3 [ 30.006211] ? smc_unhash_sk+0x345/0x4a0 [ 30.010256] report_bug+0x252/0x2d0 [ 30.013864] do_error_trap+0x1de/0x490 [ 30.017732] ? graph_lock+0x170/0x170 [ 30.021513] ? math_error+0x420/0x420 [ 30.025298] ? lock_acquire+0x1dc/0x520 [ 30.029253] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.034094] do_invalid_op+0x1b/0x20 [ 30.037803] invalid_op+0x14/0x20 [ 30.041247] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 30.045890] RSP: 0018:ffff8801ad537488 EFLAGS: 00010293 [ 30.051233] RAX: ffff8801ad478380 RBX: ffff8801ada127c0 RCX: ffffffff873f756e [ 30.058480] RDX: 0000000000000000 RSI: ffffffff873f7625 RDI: 0000000000000005 [ 30.065728] RBP: ffff8801ad537570 R08: ffff8801ad478380 R09: ffffed0035b42508 [ 30.072980] R10: ffffed0035b42508 R11: ffff8801ada12843 R12: 1ffff10035aa6e95 [ 30.080226] R13: ffff8801ad537548 R14: ffffffff8970b1e0 R15: ffff8801ada12840 [ 30.087481] ? smc_unhash_sk+0x28e/0x4a0 [ 30.091521] ? smc_unhash_sk+0x345/0x4a0 [ 30.095559] ? smc_unhash_sk+0x345/0x4a0 [ 30.099598] ? smc_rx_data_available+0x100/0x100 [ 30.104331] ? release_sock+0x1e2/0x2b0 [ 30.108282] ? __local_bh_enable_ip+0x161/0x230 [ 30.112930] ? __release_sock+0x3a0/0x3a0 [ 30.117058] ? smc_release+0x269/0x610 [ 30.120927] ? trace_hardirqs_on+0xd/0x10 [ 30.125051] ? __local_bh_enable_ip+0x161/0x230 [ 30.129708] smc_release+0x36e/0x610 [ 30.133408] sock_release+0x96/0x1b0 [ 30.137100] ? sock_alloc_file+0x4e0/0x4e0 [ 30.141312] sock_close+0x16/0x20 [ 30.144743] __fput+0x34d/0x890 [ 30.148008] ? fput+0x1a0/0x1a0 [ 30.151276] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.155751] ____fput+0x15/0x20 [ 30.159012] task_work_run+0x1e4/0x290 [ 30.162885] ? task_work_cancel+0x240/0x240 [ 30.167186] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.172702] ? switch_task_namespaces+0xa2/0xd0 [ 30.177351] do_exit+0x1aee/0x2730 [ 30.180870] ? _raw_spin_unlock_bh+0x30/0x40 [ 30.185259] ? mm_update_next_owner+0x980/0x980 [ 30.189910] ? ___sys_sendmsg+0x31a/0x940 [ 30.194044] ? rcu_read_lock_sched_held+0x108/0x120 [ 30.199054] ? kfree+0x1e9/0x260 [ 30.202409] ? ___sys_sendmsg+0x31f/0x940 [ 30.206539] ? copy_msghdr_from_user+0x560/0x560 [ 30.211275] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.216269] ? graph_lock+0x170/0x170 [ 30.220049] ? pud_val+0x80/0xf0 [ 30.223403] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.228918] ? __fget_light+0x2ef/0x430 [ 30.232871] ? __handle_mm_fault+0x93a/0x4310 [ 30.237349] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 30.242082] ? graph_lock+0x170/0x170 [ 30.245872] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.251387] ? sockfd_lookup_light+0xc5/0x160 [ 30.255861] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.261376] ? __sys_sendmmsg+0x4b3/0x6f0 [ 30.265505] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 30.269809] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.275326] ? __handle_mm_fault+0x4310/0x4310 [ 30.279894] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.285416] ? __do_page_fault+0x441/0xe40 [ 30.289675] do_group_exit+0x16f/0x430 [ 30.293553] ? mm_fault_error+0x380/0x380 [ 30.297689] ? __ia32_sys_exit+0x50/0x50 [ 30.301740] ? do_syscall_64+0x92/0x800 [ 30.305694] __x64_sys_exit_group+0x3e/0x50 [ 30.309998] do_syscall_64+0x1b1/0x800 [ 30.313872] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.318781] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.323701] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.329057] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.333893] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.339070] RIP: 0033:0x43ee28 [ 30.342239] RSP: 002b:00007ffe6e4e84c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 30.349933] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ee28 [ 30.357183] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 30.364434] RBP: 00000000004be840 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 30.371685] R10: 000000002004c080 R11: 0000000000000246 R12: 0000000000000001 [ 30.378931] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 30.386818] Dumping ftrace buffer: [ 30.390426] (ftrace buffer empty) [ 30.394113] Kernel Offset: disabled [ 30.397717] Rebooting in 86400 seconds..