[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 24.299755] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.316517] random: sshd: uninitialized urandom read (32 bytes read) [ 28.756691] random: sshd: uninitialized urandom read (32 bytes read) [ 29.503685] random: sshd: uninitialized urandom read (32 bytes read) [ 29.671211] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.40' (ECDSA) to the list of known hosts. [ 35.117614] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 35.224586] WARNING: CPU: 0 PID: 4552 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 35.232998] Kernel panic - not syncing: panic_on_warn set ... [ 35.232998] [ 35.240361] CPU: 0 PID: 4552 Comm: syz-executor490 Not tainted 4.17.0-rc3+ #33 [ 35.247711] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.257045] Call Trace: [ 35.259620] dump_stack+0x1b9/0x294 [ 35.263232] ? dump_stack_print_info.cold.2+0x52/0x52 [ 35.268409] ? smc_unhash_sk+0x270/0x4a0 [ 35.272452] panic+0x22f/0x4de [ 35.275626] ? add_taint.cold.5+0x16/0x16 [ 35.279754] ? __warn.cold.8+0x148/0x1b3 [ 35.283808] ? __warn.cold.8+0x117/0x1b3 [ 35.287853] ? smc_unhash_sk+0x345/0x4a0 [ 35.291894] __warn.cold.8+0x163/0x1b3 [ 35.295764] ? smc_unhash_sk+0x345/0x4a0 [ 35.299809] report_bug+0x252/0x2d0 [ 35.303423] do_error_trap+0x1de/0x490 [ 35.307293] ? graph_lock+0x170/0x170 [ 35.311080] ? math_error+0x420/0x420 [ 35.314868] ? lock_acquire+0x1dc/0x520 [ 35.318826] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.323651] do_invalid_op+0x1b/0x20 [ 35.327347] invalid_op+0x14/0x20 [ 35.330792] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 35.335438] RSP: 0018:ffff8801b1af7488 EFLAGS: 00010293 [ 35.340782] RAX: ffff8801ad2ee1c0 RBX: ffff8801d8c647c0 RCX: ffffffff873fe71e [ 35.348037] RDX: 0000000000000000 RSI: ffffffff873fe7d5 RDI: 0000000000000005 [ 35.355290] RBP: ffff8801b1af7570 R08: ffff8801ad2ee1c0 R09: ffffed003b18c908 [ 35.362541] R10: ffffed003b18c908 R11: ffff8801d8c64843 R12: 1ffff1003635ee95 [ 35.369792] R13: ffff8801b1af7548 R14: ffffffff8970e4e0 R15: ffff8801d8c64840 [ 35.377067] ? smc_unhash_sk+0x28e/0x4a0 [ 35.381109] ? smc_unhash_sk+0x345/0x4a0 [ 35.385157] ? smc_unhash_sk+0x345/0x4a0 [ 35.389201] ? smc_rx_data_available+0x100/0x100 [ 35.393940] ? release_sock+0x1e2/0x2b0 [ 35.397900] ? __local_bh_enable_ip+0x161/0x230 [ 35.402553] ? __release_sock+0x3a0/0x3a0 [ 35.406683] ? smc_release+0x269/0x610 [ 35.410551] ? trace_hardirqs_on+0xd/0x10 [ 35.414680] ? __local_bh_enable_ip+0x161/0x230 [ 35.419333] smc_release+0x36e/0x610 [ 35.423041] sock_release+0x96/0x1b0 [ 35.426753] ? sock_alloc_file+0x4e0/0x4e0 [ 35.430976] sock_close+0x16/0x20 [ 35.434415] __fput+0x34d/0x890 [ 35.437680] ? fput+0x1a0/0x1a0 [ 35.440942] ? _raw_spin_unlock_irq+0x27/0x70 [ 35.445421] ____fput+0x15/0x20 [ 35.448688] task_work_run+0x1e4/0x290 [ 35.452558] ? task_work_cancel+0x240/0x240 [ 35.456866] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 35.462386] ? switch_task_namespaces+0xa2/0xd0 [ 35.467063] do_exit+0x1aee/0x2730 [ 35.470589] ? mm_update_next_owner+0x980/0x980 [ 35.475238] ? lock_downgrade+0x8e0/0x8e0 [ 35.479367] ? noop_count+0x40/0x40 [ 35.482978] ? lock_pin_lock+0x350/0x350 [ 35.487034] ? kasan_check_read+0x11/0x20 [ 35.491173] ? rcu_is_watching+0x85/0x140 [ 35.495304] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 35.500478] ? is_bpf_text_address+0xd7/0x170 [ 35.504958] ? check_usage_backwards+0x151/0x3a0 [ 35.509694] ? graph_lock+0x170/0x170 [ 35.513476] ? graph_lock+0x170/0x170 [ 35.517263] ? find_held_lock+0x36/0x1c0 [ 35.521311] ? lock_downgrade+0x8e0/0x8e0 [ 35.525444] ? kasan_check_read+0x11/0x20 [ 35.529574] ? do_raw_spin_unlock+0x9e/0x2e0 [ 35.533963] ? __local_bh_enable_ip+0x161/0x230 [ 35.538613] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 35.543612] ? release_sock+0x1e2/0x2b0 [ 35.547565] ? trace_hardirqs_on+0xd/0x10 [ 35.551693] ? __local_bh_enable_ip+0x161/0x230 [ 35.556342] ? _raw_spin_unlock_bh+0x30/0x40 [ 35.560730] ? release_sock+0x1e2/0x2b0 [ 35.564686] ? __release_sock+0x3a0/0x3a0 [ 35.568820] ? __local_bh_enable_ip+0x161/0x230 [ 35.573473] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 35.578648] ? smc_setsockopt+0x1ed/0x630 [ 35.582779] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.588305] ? __sys_setsockopt+0x24f/0x390 [ 35.592614] do_group_exit+0x16f/0x430 [ 35.596485] ? mm_fault_error+0x380/0x380 [ 35.600614] ? __ia32_sys_exit+0x50/0x50 [ 35.604660] ? do_syscall_64+0x92/0x800 [ 35.608617] __x64_sys_exit_group+0x3e/0x50 [ 35.612921] do_syscall_64+0x1b1/0x800 [ 35.616795] ? syscall_return_slowpath+0x5c0/0x5c0 [ 35.621709] ? syscall_return_slowpath+0x30f/0x5c0 [ 35.626624] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 35.631975] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.636806] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.641976] RIP: 0033:0x43e8d8 [ 35.645145] RSP: 002b:00007ffd4b10fe28 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 35.652833] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 35.660086] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 35.667339] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 35.674589] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 35.681839] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 35.689750] Dumping ftrace buffer: [ 35.693428] (ftrace buffer empty) [ 35.697122] Kernel Offset: disabled [ 35.700730] Rebooting in 86400 seconds..