[....] Starting OpenBSD Secure Shell server: sshd[ 20.407133] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.110995] random: sshd: uninitialized urandom read (32 bytes read) [ 24.634398] random: sshd: uninitialized urandom read (32 bytes read) [ 25.414546] sshd (4482) used greatest stack depth: 16840 bytes left [ 25.432769] random: sshd: uninitialized urandom read (32 bytes read) [ 25.590544] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.20' (ECDSA) to the list of known hosts. [ 31.012618] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.102427] WARNING: CPU: 1 PID: 4495 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 31.110838] Kernel panic - not syncing: panic_on_warn set ... [ 31.110838] [ 31.118193] CPU: 1 PID: 4495 Comm: syz-executor633 Not tainted 4.17.0-rc3+ #38 [ 31.125656] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.135003] Call Trace: [ 31.137581] dump_stack+0x1b9/0x294 [ 31.141192] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.146371] ? smc_unhash_sk+0x290/0x4a0 [ 31.150416] panic+0x22f/0x4de [ 31.153590] ? add_taint.cold.5+0x16/0x16 [ 31.157722] ? __warn.cold.8+0x148/0x1b3 [ 31.161765] ? __warn.cold.8+0x117/0x1b3 [ 31.165807] ? smc_unhash_sk+0x345/0x4a0 [ 31.169848] __warn.cold.8+0x163/0x1b3 [ 31.173717] ? smc_unhash_sk+0x345/0x4a0 [ 31.177761] report_bug+0x252/0x2d0 [ 31.181372] do_error_trap+0x1de/0x490 [ 31.185240] ? graph_lock+0x170/0x170 [ 31.189022] ? math_error+0x420/0x420 [ 31.192805] ? lock_acquire+0x1dc/0x520 [ 31.196761] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.201586] do_invalid_op+0x1b/0x20 [ 31.205282] invalid_op+0x14/0x20 [ 31.208717] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 31.213361] RSP: 0018:ffff8801ae61f488 EFLAGS: 00010293 [ 31.218706] RAX: ffff8801aeb94180 RBX: ffff8801d91ec7c0 RCX: ffffffff873f7cfe [ 31.225955] RDX: 0000000000000000 RSI: ffffffff873f7db5 RDI: 0000000000000005 [ 31.233210] RBP: ffff8801ae61f570 R08: ffff8801aeb94180 R09: ffffed003b23d908 [ 31.240460] R10: ffffed003b23d908 R11: ffff8801d91ec843 R12: 1ffff10035cc3e95 [ 31.247707] R13: ffff8801ae61f548 R14: ffffffff8970b1e0 R15: ffff8801d91ec840 [ 31.254964] ? smc_unhash_sk+0x28e/0x4a0 [ 31.259003] ? smc_unhash_sk+0x345/0x4a0 [ 31.263045] ? smc_unhash_sk+0x345/0x4a0 [ 31.267085] ? smc_rx_data_available+0x100/0x100 [ 31.271836] ? release_sock+0x1e2/0x2b0 [ 31.275795] ? __local_bh_enable_ip+0x161/0x230 [ 31.280445] ? __release_sock+0x3a0/0x3a0 [ 31.284574] ? smc_release+0x269/0x610 [ 31.288441] ? trace_hardirqs_on+0xd/0x10 [ 31.292569] ? __local_bh_enable_ip+0x161/0x230 [ 31.297220] smc_release+0x36e/0x610 [ 31.300919] sock_release+0x96/0x1b0 [ 31.304611] ? sock_alloc_file+0x4e0/0x4e0 [ 31.308825] sock_close+0x16/0x20 [ 31.312258] __fput+0x34d/0x890 [ 31.315521] ? fput+0x1a0/0x1a0 [ 31.318787] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.323266] ____fput+0x15/0x20 [ 31.326527] task_work_run+0x1e4/0x290 [ 31.330393] ? task_work_cancel+0x240/0x240 [ 31.334698] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.340217] ? switch_task_namespaces+0xa2/0xd0 [ 31.344866] do_exit+0x1aee/0x2730 [ 31.348388] ? mm_update_next_owner+0x980/0x980 [ 31.353036] ? lock_downgrade+0x8e0/0x8e0 [ 31.357162] ? noop_count+0x40/0x40 [ 31.360772] ? lock_pin_lock+0x350/0x350 [ 31.364826] ? kasan_check_read+0x11/0x20 [ 31.368954] ? rcu_is_watching+0x85/0x140 [ 31.373080] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 31.378252] ? is_bpf_text_address+0xd7/0x170 [ 31.382729] ? check_usage_backwards+0x151/0x3a0 [ 31.387462] ? graph_lock+0x170/0x170 [ 31.391239] ? graph_lock+0x170/0x170 [ 31.395026] ? find_held_lock+0x36/0x1c0 [ 31.399073] ? lock_downgrade+0x8e0/0x8e0 [ 31.403202] ? kasan_check_read+0x11/0x20 [ 31.407331] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.411721] ? __local_bh_enable_ip+0x161/0x230 [ 31.416367] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.421362] ? release_sock+0x1e2/0x2b0 [ 31.425316] ? trace_hardirqs_on+0xd/0x10 [ 31.429443] ? __local_bh_enable_ip+0x161/0x230 [ 31.434096] ? _raw_spin_unlock_bh+0x30/0x40 [ 31.438482] ? release_sock+0x1e2/0x2b0 [ 31.442439] ? __release_sock+0x3a0/0x3a0 [ 31.446569] ? __local_bh_enable_ip+0x161/0x230 [ 31.451226] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 31.456402] ? smc_setsockopt+0x1ed/0x630 [ 31.460540] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.466060] ? __sys_setsockopt+0x24f/0x390 [ 31.470364] do_group_exit+0x16f/0x430 [ 31.474237] ? mm_fault_error+0x380/0x380 [ 31.478374] ? __ia32_sys_exit+0x50/0x50 [ 31.482422] ? do_syscall_64+0x92/0x800 [ 31.486378] __x64_sys_exit_group+0x3e/0x50 [ 31.490683] do_syscall_64+0x1b1/0x800 [ 31.494552] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.499462] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.504374] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.509727] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.514553] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.519732] RIP: 0033:0x43e8d8 [ 31.522899] RSP: 002b:00007ffdad3c3f48 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 31.530587] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 31.537836] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 31.545087] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 31.552337] R10: 0000000020000040 R11: 0000000000000246 R12: 0000000000000001 [ 31.559588] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 31.567417] Dumping ftrace buffer: [ 31.571040] (ftrace buffer empty) [ 31.574749] Kernel Offset: disabled [ 31.578364] Rebooting in 86400 seconds..