[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.534498] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 23.464846] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.819716] random: sshd: uninitialized urandom read (32 bytes read) [ 24.540415] random: sshd: uninitialized urandom read (32 bytes read) [ 24.698428] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.51' (ECDSA) to the list of known hosts. [ 30.224550] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.316993] WARNING: CPU: 1 PID: 4510 at include/net/sock.h:639 smc_unhash_sk+0x345/0x4a0 [ 30.325401] Kernel panic - not syncing: panic_on_warn set ... [ 30.325401] [ 30.332757] CPU: 1 PID: 4510 Comm: syz-executor245 Not tainted 4.17.0-rc2+ #26 [ 30.340098] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.349438] Call Trace: [ 30.352021] dump_stack+0x1b9/0x294 [ 30.355648] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.360879] ? smc_unhash_sk+0x290/0x4a0 [ 30.364926] panic+0x22f/0x4de [ 30.368099] ? add_taint.cold.5+0x16/0x16 [ 30.372232] ? __warn.cold.8+0x148/0x1b3 [ 30.376281] ? __warn.cold.8+0x117/0x1b3 [ 30.380325] ? smc_unhash_sk+0x345/0x4a0 [ 30.384369] __warn.cold.8+0x163/0x1b3 [ 30.388241] ? smc_unhash_sk+0x345/0x4a0 [ 30.392285] report_bug+0x252/0x2d0 [ 30.395895] do_error_trap+0x1de/0x490 [ 30.399780] ? graph_lock+0x170/0x170 [ 30.403562] ? math_error+0x420/0x420 [ 30.407350] ? lock_acquire+0x1dc/0x520 [ 30.411309] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.416134] do_invalid_op+0x1b/0x20 [ 30.419841] invalid_op+0x14/0x20 [ 30.423295] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 30.427943] RSP: 0018:ffff8801ad887488 EFLAGS: 00010293 [ 30.433287] RAX: ffff8801ade9c6c0 RBX: ffff8801ada9e7c0 RCX: ffffffff873faafe [ 30.440552] RDX: 0000000000000000 RSI: ffffffff873fabb5 RDI: 0000000000000005 [ 30.447805] RBP: ffff8801ad887570 R08: ffff8801ade9c6c0 R09: ffffed0035b53d08 [ 30.455063] R10: ffffed0035b53d08 R11: ffff8801ada9e843 R12: 1ffff10035b10e95 [ 30.462321] R13: ffff8801ad887548 R14: ffffffff8970df20 R15: ffff8801ada9e840 [ 30.469586] ? smc_unhash_sk+0x28e/0x4a0 [ 30.473632] ? smc_unhash_sk+0x345/0x4a0 [ 30.477686] ? smc_unhash_sk+0x345/0x4a0 [ 30.481728] ? smc_hash_sk+0x2f0/0x2f0 [ 30.485599] ? release_sock+0x1e2/0x2b0 [ 30.489558] ? __local_bh_enable_ip+0x161/0x230 [ 30.494210] ? __release_sock+0x3a0/0x3a0 [ 30.498341] ? smc_release+0x269/0x610 [ 30.502220] ? trace_hardirqs_on+0xd/0x10 [ 30.506356] ? __local_bh_enable_ip+0x161/0x230 [ 30.511015] smc_release+0x36e/0x610 [ 30.514749] sock_release+0x96/0x1b0 [ 30.518489] ? sock_alloc_file+0x4e0/0x4e0 [ 30.522895] sock_close+0x16/0x20 [ 30.526346] __fput+0x34d/0x890 [ 30.529630] ? fput+0x1a0/0x1a0 [ 30.532935] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.537453] ____fput+0x15/0x20 [ 30.540727] task_work_run+0x1e4/0x290 [ 30.544602] ? task_work_cancel+0x240/0x240 [ 30.548921] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.554463] ? switch_task_namespaces+0xa2/0xd0 [ 30.559120] do_exit+0x1aee/0x2730 [ 30.562662] ? mm_update_next_owner+0x980/0x980 [ 30.567325] ? lock_downgrade+0x8e0/0x8e0 [ 30.571458] ? noop_count+0x40/0x40 [ 30.575070] ? lock_pin_lock+0x350/0x350 [ 30.579119] ? kasan_check_read+0x11/0x20 [ 30.583250] ? rcu_is_watching+0x85/0x140 [ 30.587388] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 30.592563] ? is_bpf_text_address+0xd7/0x170 [ 30.597047] ? check_usage_backwards+0x151/0x3a0 [ 30.601790] ? graph_lock+0x170/0x170 [ 30.605573] ? graph_lock+0x170/0x170 [ 30.609360] ? find_held_lock+0x36/0x1c0 [ 30.613415] ? lock_downgrade+0x8e0/0x8e0 [ 30.617551] ? kasan_check_read+0x11/0x20 [ 30.621681] ? do_raw_spin_unlock+0x9e/0x2e0 [ 30.626082] ? __local_bh_enable_ip+0x161/0x230 [ 30.630736] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.635741] ? release_sock+0x1e2/0x2b0 [ 30.639718] ? trace_hardirqs_on+0xd/0x10 [ 30.643850] ? __local_bh_enable_ip+0x161/0x230 [ 30.648504] ? _raw_spin_unlock_bh+0x30/0x40 [ 30.652898] ? release_sock+0x1e2/0x2b0 [ 30.656856] ? __release_sock+0x3a0/0x3a0 [ 30.660991] ? __local_bh_enable_ip+0x161/0x230 [ 30.665650] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 30.670823] ? smc_setsockopt+0x1ed/0x630 [ 30.674958] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.680485] ? __sys_setsockopt+0x24f/0x390 [ 30.685063] do_group_exit+0x16f/0x430 [ 30.688935] ? mm_fault_error+0x380/0x380 [ 30.693071] ? __ia32_sys_exit+0x50/0x50 [ 30.697119] ? do_syscall_64+0x92/0x800 [ 30.701080] __x64_sys_exit_group+0x3e/0x50 [ 30.705391] do_syscall_64+0x1b1/0x800 [ 30.709268] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 30.714102] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.719031] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.723951] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.729297] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.734125] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.739302] RIP: 0033:0x43e8d8 [ 30.742474] RSP: 002b:00007ffd603faee8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 30.750164] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 30.757413] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 30.764663] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 30.771919] R10: 0000000020000080 R11: 0000000000000246 R12: 0000000000000001 [ 30.779170] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 30.787009] Dumping ftrace buffer: [ 30.790695] (ftrace buffer empty) [ 30.794403] Kernel Offset: disabled [ 30.798028] Rebooting in 86400 seconds..