[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.540926] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.754264] random: sshd: uninitialized urandom read (32 bytes read) [ 24.048724] random: sshd: uninitialized urandom read (32 bytes read) [ 24.826929] random: sshd: uninitialized urandom read (32 bytes read) [ 24.989199] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.35' (ECDSA) to the list of known hosts. [ 30.421886] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.538996] WARNING: CPU: 1 PID: 4494 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 30.547418] Kernel panic - not syncing: panic_on_warn set ... [ 30.547418] [ 30.554777] CPU: 1 PID: 4494 Comm: syz-executor442 Not tainted 4.17.0-rc3+ #38 [ 30.562114] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.571480] Call Trace: [ 30.574062] dump_stack+0x1b9/0x294 [ 30.577680] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.582857] ? smc_unhash_sk+0x290/0x4a0 [ 30.586906] panic+0x22f/0x4de [ 30.590078] ? add_taint.cold.5+0x16/0x16 [ 30.594213] ? __warn.cold.8+0x148/0x1b3 [ 30.598256] ? __warn.cold.8+0x117/0x1b3 [ 30.602299] ? smc_unhash_sk+0x345/0x4a0 [ 30.606345] __warn.cold.8+0x163/0x1b3 [ 30.610224] ? smc_unhash_sk+0x345/0x4a0 [ 30.614279] report_bug+0x252/0x2d0 [ 30.617925] do_error_trap+0x1de/0x490 [ 30.621800] ? graph_lock+0x170/0x170 [ 30.625584] ? math_error+0x420/0x420 [ 30.629372] ? lock_acquire+0x1dc/0x520 [ 30.633337] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.638163] do_invalid_op+0x1b/0x20 [ 30.641857] invalid_op+0x14/0x20 [ 30.645302] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 30.649945] RSP: 0018:ffff8801ad6b7488 EFLAGS: 00010293 [ 30.655291] RAX: ffff8801ad65a180 RBX: ffff8801ad7f37c0 RCX: ffffffff873f7cfe [ 30.662542] RDX: 0000000000000000 RSI: ffffffff873f7db5 RDI: 0000000000000005 [ 30.669793] RBP: ffff8801ad6b7570 R08: ffff8801ad65a180 R09: ffffed0035afe708 [ 30.677560] R10: ffffed0035afe708 R11: ffff8801ad7f3843 R12: 1ffff10035ad6e95 [ 30.684812] R13: ffff8801ad6b7548 R14: ffffffff8970b1e0 R15: ffff8801ad7f3840 [ 30.692080] ? smc_unhash_sk+0x28e/0x4a0 [ 30.696126] ? smc_unhash_sk+0x345/0x4a0 [ 30.700180] ? smc_unhash_sk+0x345/0x4a0 [ 30.704246] ? smc_rx_data_available+0x100/0x100 [ 30.708993] ? release_sock+0x1e2/0x2b0 [ 30.712959] ? __local_bh_enable_ip+0x161/0x230 [ 30.717615] ? __release_sock+0x3a0/0x3a0 [ 30.721746] ? smc_release+0x269/0x610 [ 30.725615] ? trace_hardirqs_on+0xd/0x10 [ 30.729747] ? __local_bh_enable_ip+0x161/0x230 [ 30.734401] smc_release+0x36e/0x610 [ 30.738112] sock_release+0x96/0x1b0 [ 30.741808] ? sock_alloc_file+0x4e0/0x4e0 [ 30.746031] sock_close+0x16/0x20 [ 30.749471] __fput+0x34d/0x890 [ 30.752734] ? fput+0x1a0/0x1a0 [ 30.755999] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.760484] ____fput+0x15/0x20 [ 30.763749] task_work_run+0x1e4/0x290 [ 30.767620] ? task_work_cancel+0x240/0x240 [ 30.771927] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.777449] ? switch_task_namespaces+0xa2/0xd0 [ 30.782099] do_exit+0x1aee/0x2730 [ 30.785625] ? mm_update_next_owner+0x980/0x980 [ 30.790280] ? ___sys_sendmsg+0x31a/0x940 [ 30.794411] ? rcu_read_lock_sched_held+0x108/0x120 [ 30.799414] ? kfree+0x1e9/0x260 [ 30.802773] ? ___sys_sendmsg+0x31f/0x940 [ 30.806908] ? copy_msghdr_from_user+0x560/0x560 [ 30.811658] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.816673] ? graph_lock+0x170/0x170 [ 30.820459] ? pud_val+0x80/0xf0 [ 30.823819] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.829340] ? __fget_light+0x2ef/0x430 [ 30.833306] ? __handle_mm_fault+0x93a/0x4310 [ 30.837788] ? fget_raw+0x20/0x20 [ 30.841227] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 30.845972] ? graph_lock+0x170/0x170 [ 30.849763] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.855283] ? sockfd_lookup_light+0xc5/0x160 [ 30.859765] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.865286] ? __sys_sendmmsg+0x4b3/0x6f0 [ 30.869423] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 30.873736] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.879259] ? __handle_mm_fault+0x4310/0x4310 [ 30.883836] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.889358] ? __do_page_fault+0x441/0xe40 [ 30.893586] do_group_exit+0x16f/0x430 [ 30.897453] ? mm_fault_error+0x380/0x380 [ 30.901585] ? __ia32_sys_exit+0x50/0x50 [ 30.905631] ? do_syscall_64+0x92/0x800 [ 30.909594] __x64_sys_exit_group+0x3e/0x50 [ 30.913903] do_syscall_64+0x1b1/0x800 [ 30.917782] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 30.922608] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.927518] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.932432] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.937781] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.942628] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.947809] RIP: 0033:0x43f428 [ 30.950983] RSP: 002b:00007fffaf02c6a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 30.958676] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043f428 [ 30.965928] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 30.973180] RBP: 00000000004bede0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 30.980440] R10: 0000000024008000 R11: 0000000000000246 R12: 0000000000000001 [ 30.987694] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 30.995609] Dumping ftrace buffer: [ 30.999276] (ftrace buffer empty) [ 31.002978] Kernel Offset: disabled [ 31.006588] Rebooting in 86400 seconds..