[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.655981] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.151856] random: sshd: uninitialized urandom read (32 bytes read) [ 21.509919] random: sshd: uninitialized urandom read (32 bytes read) [ 22.273648] random: sshd: uninitialized urandom read (32 bytes read) [ 22.427963] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.28' (ECDSA) to the list of known hosts. [ 27.873582] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.967083] WARNING: CPU: 0 PID: 4503 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 27.975460] Kernel panic - not syncing: panic_on_warn set ... [ 27.975460] [ 27.982805] CPU: 0 PID: 4503 Comm: syz-executor375 Not tainted 4.17.0-rc4+ #41 [ 27.990141] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.999470] Call Trace: [ 28.002046] dump_stack+0x1b9/0x294 [ 28.005663] ? dump_stack_print_info.cold.2+0x52/0x52 [ 28.010835] ? smc_unhash_sk+0x2d0/0x4a0 [ 28.014880] panic+0x22f/0x4de [ 28.018055] ? add_taint.cold.5+0x16/0x16 [ 28.022184] ? __warn.cold.8+0x148/0x1b3 [ 28.026223] ? __warn.cold.8+0x117/0x1b3 [ 28.030263] ? smc_unhash_sk+0x345/0x4a0 [ 28.034304] __warn.cold.8+0x163/0x1b3 [ 28.038173] ? smc_unhash_sk+0x345/0x4a0 [ 28.042215] report_bug+0x252/0x2d0 [ 28.045822] do_error_trap+0x1de/0x490 [ 28.049686] ? graph_lock+0x170/0x170 [ 28.053467] ? math_error+0x420/0x420 [ 28.057267] ? lock_acquire+0x1dc/0x520 [ 28.061224] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.066050] do_invalid_op+0x1b/0x20 [ 28.069745] invalid_op+0x14/0x20 [ 28.073177] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 28.077821] RSP: 0018:ffff8801d95f7488 EFLAGS: 00010293 [ 28.083162] RAX: ffff8801d979c3c0 RBX: ffff8801ac1db7c0 RCX: ffffffff87404cbe [ 28.090411] RDX: 0000000000000000 RSI: ffffffff87404d75 RDI: 0000000000000005 [ 28.097663] RBP: ffff8801d95f7570 R08: ffff8801d979c3c0 R09: ffffed003583b708 [ 28.104913] R10: ffffed003583b708 R11: ffff8801ac1db843 R12: 1ffff1003b2bee95 [ 28.112163] R13: ffff8801d95f7548 R14: ffffffff8970cc20 R15: ffff8801ac1db840 [ 28.119421] ? smc_unhash_sk+0x28e/0x4a0 [ 28.123470] ? smc_unhash_sk+0x345/0x4a0 [ 28.127512] ? smc_unhash_sk+0x345/0x4a0 [ 28.131554] ? smc_rx_data_available+0x100/0x100 [ 28.136292] ? release_sock+0x1e2/0x2b0 [ 28.140248] ? __local_bh_enable_ip+0x161/0x230 [ 28.144897] ? __release_sock+0x3a0/0x3a0 [ 28.149035] ? smc_release+0x269/0x610 [ 28.152912] ? trace_hardirqs_on+0xd/0x10 [ 28.157049] ? __local_bh_enable_ip+0x161/0x230 [ 28.161702] smc_release+0x36e/0x610 [ 28.165409] sock_release+0x96/0x1b0 [ 28.169104] ? sock_alloc_file+0x4e0/0x4e0 [ 28.173318] sock_close+0x16/0x20 [ 28.176749] __fput+0x34d/0x890 [ 28.180020] ? fput+0x1a0/0x1a0 [ 28.183286] ? _raw_spin_unlock_irq+0x27/0x70 [ 28.187762] ____fput+0x15/0x20 [ 28.191030] task_work_run+0x1e4/0x290 [ 28.194902] ? task_work_cancel+0x240/0x240 [ 28.199208] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 28.204729] ? switch_task_namespaces+0xa2/0xd0 [ 28.209379] do_exit+0x1aee/0x2730 [ 28.212909] ? mm_update_next_owner+0x980/0x980 [ 28.217567] ? lock_downgrade+0x8e0/0x8e0 [ 28.221695] ? noop_count+0x40/0x40 [ 28.225310] ? lock_pin_lock+0x350/0x350 [ 28.229372] ? kasan_check_read+0x11/0x20 [ 28.233499] ? rcu_is_watching+0x85/0x140 [ 28.237635] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 28.242816] ? is_bpf_text_address+0xd7/0x170 [ 28.247291] ? check_usage_backwards+0x151/0x3a0 [ 28.252042] ? graph_lock+0x170/0x170 [ 28.255826] ? graph_lock+0x170/0x170 [ 28.259612] ? find_held_lock+0x36/0x1c0 [ 28.263657] ? lock_downgrade+0x8e0/0x8e0 [ 28.267789] ? kasan_check_read+0x11/0x20 [ 28.271916] ? do_raw_spin_unlock+0x9e/0x2e0 [ 28.276304] ? __local_bh_enable_ip+0x161/0x230 [ 28.280954] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.285956] ? release_sock+0x1e2/0x2b0 [ 28.289911] ? trace_hardirqs_on+0xd/0x10 [ 28.294044] ? __local_bh_enable_ip+0x161/0x230 [ 28.298705] ? _raw_spin_unlock_bh+0x30/0x40 [ 28.303095] ? release_sock+0x1e2/0x2b0 [ 28.307057] ? __release_sock+0x3a0/0x3a0 [ 28.311190] ? __local_bh_enable_ip+0x161/0x230 [ 28.315840] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 28.321023] ? smc_setsockopt+0x1ed/0x630 [ 28.325157] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.330675] ? __sys_setsockopt+0x24f/0x390 [ 28.334979] do_group_exit+0x16f/0x430 [ 28.338874] ? mm_fault_error+0x380/0x380 [ 28.343009] ? __ia32_sys_exit+0x50/0x50 [ 28.347061] ? do_syscall_64+0x92/0x800 [ 28.351027] __x64_sys_exit_group+0x3e/0x50 [ 28.355333] do_syscall_64+0x1b1/0x800 [ 28.359201] ? syscall_return_slowpath+0x5c0/0x5c0 [ 28.364110] ? syscall_return_slowpath+0x30f/0x5c0 [ 28.369041] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 28.374391] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.379219] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 28.384388] RIP: 0033:0x43e8b8 [ 28.387554] RSP: 002b:00007ffcd0026048 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 28.395250] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8b8 [ 28.402498] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 28.409745] RBP: 00000000004be260 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 28.417007] R10: 0000000020000280 R11: 0000000000000246 R12: 0000000000000001 [ 28.424276] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 28.432205] Dumping ftrace buffer: [ 28.435823] (ftrace buffer empty) [ 28.439516] Kernel Offset: disabled [ 28.443126] Rebooting in 86400 seconds..