[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.438590] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.445798] random: sshd: uninitialized urandom read (32 bytes read) [ 24.786683] random: sshd: uninitialized urandom read (32 bytes read) [ 25.542623] random: sshd: uninitialized urandom read (32 bytes read) [ 25.698131] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.8' (ECDSA) to the list of known hosts. [ 31.162162] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.252817] WARNING: CPU: 0 PID: 4511 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 31.261211] Kernel panic - not syncing: panic_on_warn set ... [ 31.261211] [ 31.268564] CPU: 0 PID: 4511 Comm: syz-executor590 Not tainted 4.17.0-rc3+ #33 [ 31.275901] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.285319] Call Trace: [ 31.287890] dump_stack+0x1b9/0x294 [ 31.291499] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.296670] ? smc_unhash_sk+0x270/0x4a0 [ 31.300711] panic+0x22f/0x4de [ 31.303884] ? add_taint.cold.5+0x16/0x16 [ 31.308021] ? __warn.cold.8+0x148/0x1b3 [ 31.312065] ? __warn.cold.8+0x117/0x1b3 [ 31.316108] ? smc_unhash_sk+0x345/0x4a0 [ 31.320149] __warn.cold.8+0x163/0x1b3 [ 31.324022] ? smc_unhash_sk+0x345/0x4a0 [ 31.328078] report_bug+0x252/0x2d0 [ 31.331684] do_error_trap+0x1de/0x490 [ 31.335548] ? graph_lock+0x170/0x170 [ 31.339328] ? math_error+0x420/0x420 [ 31.343109] ? lock_acquire+0x1dc/0x520 [ 31.347066] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.351886] do_invalid_op+0x1b/0x20 [ 31.355579] invalid_op+0x14/0x20 [ 31.359018] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 31.363667] RSP: 0018:ffff8801ad14f488 EFLAGS: 00010293 [ 31.369009] RAX: ffff8801ad8204c0 RBX: ffff8801d95be7c0 RCX: ffffffff873fe71e [ 31.376268] RDX: 0000000000000000 RSI: ffffffff873fe7d5 RDI: 0000000000000005 [ 31.383514] RBP: ffff8801ad14f570 R08: ffff8801ad8204c0 R09: ffffed003b2b7d08 [ 31.390761] R10: ffffed003b2b7d08 R11: ffff8801d95be843 R12: 1ffff10035a29e95 [ 31.398010] R13: ffff8801ad14f548 R14: ffffffff8970e4e0 R15: ffff8801d95be840 [ 31.405274] ? smc_unhash_sk+0x28e/0x4a0 [ 31.409312] ? smc_unhash_sk+0x345/0x4a0 [ 31.413351] ? smc_unhash_sk+0x345/0x4a0 [ 31.417403] ? smc_rx_data_available+0x100/0x100 [ 31.422139] ? release_sock+0x1e2/0x2b0 [ 31.426103] ? __local_bh_enable_ip+0x161/0x230 [ 31.430748] ? __release_sock+0x3a0/0x3a0 [ 31.434874] ? smc_release+0x269/0x610 [ 31.438738] ? trace_hardirqs_on+0xd/0x10 [ 31.442865] ? __local_bh_enable_ip+0x161/0x230 [ 31.447515] smc_release+0x36e/0x610 [ 31.451212] sock_release+0x96/0x1b0 [ 31.454904] ? sock_alloc_file+0x4e0/0x4e0 [ 31.459126] sock_close+0x16/0x20 [ 31.462561] __fput+0x34d/0x890 [ 31.465823] ? fput+0x1a0/0x1a0 [ 31.469082] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.473557] ____fput+0x15/0x20 [ 31.476817] task_work_run+0x1e4/0x290 [ 31.480682] ? task_work_cancel+0x240/0x240 [ 31.484983] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.490508] ? switch_task_namespaces+0xa2/0xd0 [ 31.495159] do_exit+0x1aee/0x2730 [ 31.498688] ? mm_update_next_owner+0x980/0x980 [ 31.503335] ? lock_downgrade+0x8e0/0x8e0 [ 31.507469] ? noop_count+0x40/0x40 [ 31.511073] ? lock_pin_lock+0x350/0x350 [ 31.515116] ? kasan_check_read+0x11/0x20 [ 31.519243] ? rcu_is_watching+0x85/0x140 [ 31.523370] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 31.528545] ? is_bpf_text_address+0xd7/0x170 [ 31.533031] ? check_usage_backwards+0x151/0x3a0 [ 31.537780] ? graph_lock+0x170/0x170 [ 31.541560] ? graph_lock+0x170/0x170 [ 31.545346] ? find_held_lock+0x36/0x1c0 [ 31.549391] ? lock_downgrade+0x8e0/0x8e0 [ 31.553522] ? kasan_check_read+0x11/0x20 [ 31.557647] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.562041] ? __local_bh_enable_ip+0x161/0x230 [ 31.566689] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.571685] ? release_sock+0x1e2/0x2b0 [ 31.575638] ? trace_hardirqs_on+0xd/0x10 [ 31.579765] ? __local_bh_enable_ip+0x161/0x230 [ 31.584414] ? _raw_spin_unlock_bh+0x30/0x40 [ 31.588804] ? release_sock+0x1e2/0x2b0 [ 31.592767] ? __release_sock+0x3a0/0x3a0 [ 31.596895] ? __local_bh_enable_ip+0x161/0x230 [ 31.601544] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 31.606713] ? smc_setsockopt+0x1ed/0x630 [ 31.610840] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.616357] ? __sys_setsockopt+0x24f/0x390 [ 31.620662] do_group_exit+0x16f/0x430 [ 31.624530] ? mm_fault_error+0x380/0x380 [ 31.628656] ? __ia32_sys_exit+0x50/0x50 [ 31.632699] ? do_syscall_64+0x92/0x800 [ 31.636652] __x64_sys_exit_group+0x3e/0x50 [ 31.640955] do_syscall_64+0x1b1/0x800 [ 31.644821] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.649729] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.654641] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.659987] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.664817] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.669985] RIP: 0033:0x43e8d8 [ 31.673153] RSP: 002b:00007ffecadcec48 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 31.680837] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 31.688084] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 31.695333] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 31.702582] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 31.709831] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 31.717696] Dumping ftrace buffer: [ 31.721307] (ftrace buffer empty) [ 31.724997] Kernel Offset: disabled [ 31.728605] Rebooting in 86400 seconds..