[....] Starting OpenBSD Secure Shell server: sshd[ 19.802449] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.577225] random: sshd: uninitialized urandom read (32 bytes read) [ 23.103409] sshd (4389) used greatest stack depth: 16184 bytes left [ 23.126162] random: sshd: uninitialized urandom read (32 bytes read) [ 23.842259] random: sshd: uninitialized urandom read (32 bytes read) [ 24.001434] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.14' (ECDSA) to the list of known hosts. [ 29.527974] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.634997] WARNING: CPU: 0 PID: 4405 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 29.643423] Kernel panic - not syncing: panic_on_warn set ... [ 29.643423] [ 29.650774] CPU: 0 PID: 4405 Comm: syz-executor142 Not tainted 4.17.0-rc2+ #31 [ 29.658115] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.667446] Call Trace: [ 29.670025] dump_stack+0x1b9/0x294 [ 29.673648] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.678831] ? smc_unhash_sk+0x2f0/0x4a0 [ 29.682877] panic+0x22f/0x4de [ 29.686052] ? add_taint.cold.5+0x16/0x16 [ 29.690185] ? __warn.cold.8+0x148/0x1b3 [ 29.694226] ? __warn.cold.8+0x117/0x1b3 [ 29.698270] ? smc_unhash_sk+0x345/0x4a0 [ 29.702313] __warn.cold.8+0x163/0x1b3 [ 29.706181] ? smc_unhash_sk+0x345/0x4a0 [ 29.710224] report_bug+0x252/0x2d0 [ 29.713833] do_error_trap+0x1de/0x490 [ 29.717702] ? graph_lock+0x170/0x170 [ 29.721482] ? math_error+0x420/0x420 [ 29.725267] ? lock_acquire+0x1dc/0x520 [ 29.729233] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.734063] do_invalid_op+0x1b/0x20 [ 29.737769] invalid_op+0x14/0x20 [ 29.741203] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 29.745850] RSP: 0018:ffff8801c1bff488 EFLAGS: 00010293 [ 29.751195] RAX: ffff8801c1bd4300 RBX: ffff8801c16687c0 RCX: ffffffff873fce9e [ 29.758446] RDX: 0000000000000000 RSI: ffffffff873fcf55 RDI: 0000000000000005 [ 29.765693] RBP: ffff8801c1bff570 R08: ffff8801c1bd4300 R09: ffffed00382cd108 [ 29.772943] R10: ffffed00382cd108 R11: ffff8801c1668843 R12: 1ffff1003837fe95 [ 29.780193] R13: ffff8801c1bff548 R14: ffffffff8970e060 R15: ffff8801c1668840 [ 29.787457] ? smc_unhash_sk+0x28e/0x4a0 [ 29.791497] ? smc_unhash_sk+0x345/0x4a0 [ 29.795537] ? smc_unhash_sk+0x345/0x4a0 [ 29.799595] ? smc_hash_sk+0x2f0/0x2f0 [ 29.803476] ? release_sock+0x1e2/0x2b0 [ 29.807437] ? __local_bh_enable_ip+0x161/0x230 [ 29.812090] ? __release_sock+0x3a0/0x3a0 [ 29.816220] ? smc_release+0x269/0x610 [ 29.820098] ? trace_hardirqs_on+0xd/0x10 [ 29.824252] ? __local_bh_enable_ip+0x161/0x230 [ 29.828917] smc_release+0x36e/0x610 [ 29.832618] sock_release+0x96/0x1b0 [ 29.836312] ? sock_alloc_file+0x4e0/0x4e0 [ 29.840529] sock_close+0x16/0x20 [ 29.843967] __fput+0x34d/0x890 [ 29.847230] ? fput+0x1a0/0x1a0 [ 29.850493] ? _raw_spin_unlock_irq+0x27/0x70 [ 29.854971] ____fput+0x15/0x20 [ 29.858245] task_work_run+0x1e4/0x290 [ 29.862126] ? task_work_cancel+0x240/0x240 [ 29.866434] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 29.871956] ? switch_task_namespaces+0xa2/0xd0 [ 29.876611] do_exit+0x1aee/0x2730 [ 29.880147] ? mm_update_next_owner+0x980/0x980 [ 29.884798] ? lock_downgrade+0x8e0/0x8e0 [ 29.888927] ? noop_count+0x40/0x40 [ 29.892534] ? lock_pin_lock+0x350/0x350 [ 29.896597] ? kasan_check_read+0x11/0x20 [ 29.900737] ? rcu_is_watching+0x85/0x140 [ 29.904870] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 29.910049] ? is_bpf_text_address+0xd7/0x170 [ 29.914547] ? check_usage_backwards+0x151/0x3a0 [ 29.919632] ? graph_lock+0x170/0x170 [ 29.923414] ? graph_lock+0x170/0x170 [ 29.927202] ? find_held_lock+0x36/0x1c0 [ 29.931422] ? lock_downgrade+0x8e0/0x8e0 [ 29.935555] ? kasan_check_read+0x11/0x20 [ 29.939695] ? do_raw_spin_unlock+0x9e/0x2e0 [ 29.944088] ? __local_bh_enable_ip+0x161/0x230 [ 29.948742] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.953741] ? release_sock+0x1e2/0x2b0 [ 29.957700] ? trace_hardirqs_on+0xd/0x10 [ 29.961831] ? __local_bh_enable_ip+0x161/0x230 [ 29.966483] ? _raw_spin_unlock_bh+0x30/0x40 [ 29.970873] ? release_sock+0x1e2/0x2b0 [ 29.974842] ? __release_sock+0x3a0/0x3a0 [ 29.978982] ? __local_bh_enable_ip+0x161/0x230 [ 29.983650] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 29.988822] ? smc_setsockopt+0x1ed/0x630 [ 29.992954] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.998488] ? __sys_setsockopt+0x24f/0x390 [ 30.002798] do_group_exit+0x16f/0x430 [ 30.006671] ? mm_fault_error+0x380/0x380 [ 30.010815] ? __ia32_sys_exit+0x50/0x50 [ 30.014863] ? do_syscall_64+0x92/0x800 [ 30.018824] __x64_sys_exit_group+0x3e/0x50 [ 30.023130] do_syscall_64+0x1b1/0x800 [ 30.027004] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.031924] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.036837] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.042185] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.047037] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.052219] RIP: 0033:0x43e8d8 [ 30.055392] RSP: 002b:00007fff6b9ab508 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 30.063093] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 30.070377] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 30.077633] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 30.084883] R10: 00000000200001c0 R11: 0000000000000246 R12: 0000000000000001 [ 30.092138] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 30.100059] Dumping ftrace buffer: [ 30.103721] (ftrace buffer empty) [ 30.107413] Kernel Offset: disabled [ 30.111027] Rebooting in 86400 seconds..