[....] Starting OpenBSD Secure Shell server: sshd[ 18.636362] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.119128] random: sshd: uninitialized urandom read (32 bytes read) [ 23.513639] random: sshd: uninitialized urandom read (32 bytes read) [ 24.294973] sshd (4480) used greatest stack depth: 16504 bytes left [ 24.311169] random: sshd: uninitialized urandom read (32 bytes read) [ 24.468897] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.14' (ECDSA) to the list of known hosts. [ 29.880166] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.972829] WARNING: CPU: 1 PID: 4493 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 29.981288] Kernel panic - not syncing: panic_on_warn set ... [ 29.981288] [ 29.988654] CPU: 1 PID: 4493 Comm: syz-executor250 Not tainted 4.17.0-rc4+ #53 [ 29.996005] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.005349] Call Trace: [ 30.007931] dump_stack+0x1b9/0x294 [ 30.011553] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.016738] ? smc_unhash_sk+0x260/0x4a0 [ 30.020782] panic+0x22f/0x4de [ 30.023957] ? add_taint.cold.5+0x16/0x16 [ 30.028088] ? __warn.cold.8+0x148/0x1b3 [ 30.033522] ? __warn.cold.8+0x117/0x1b3 [ 30.037568] ? smc_unhash_sk+0x345/0x4a0 [ 30.041615] __warn.cold.8+0x163/0x1b3 [ 30.045484] ? smc_unhash_sk+0x345/0x4a0 [ 30.049529] report_bug+0x252/0x2d0 [ 30.053139] do_error_trap+0x1de/0x490 [ 30.057011] ? graph_lock+0x170/0x170 [ 30.060803] ? math_error+0x420/0x420 [ 30.064593] ? lock_acquire+0x1dc/0x520 [ 30.068551] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.073389] do_invalid_op+0x1b/0x20 [ 30.077090] invalid_op+0x14/0x20 [ 30.080525] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 30.085170] RSP: 0018:ffff8801adecf488 EFLAGS: 00010293 [ 30.090524] RAX: ffff8801a9a2a300 RBX: ffff8801adc547c0 RCX: ffffffff8740fb2e [ 30.097784] RDX: 0000000000000000 RSI: ffffffff8740fbe5 RDI: 0000000000000005 [ 30.105041] RBP: ffff8801adecf570 R08: ffff8801a9a2a300 R09: ffffed0035b8a908 [ 30.112303] R10: ffffed0035b8a908 R11: ffff8801adc54843 R12: 1ffff10035bd9e95 [ 30.119552] R13: ffff8801adecf548 R14: ffffffff8970dc60 R15: ffff8801adc54840 [ 30.126821] ? smc_unhash_sk+0x28e/0x4a0 [ 30.130862] ? smc_unhash_sk+0x345/0x4a0 [ 30.134908] ? smc_unhash_sk+0x345/0x4a0 [ 30.138977] ? smc_rx_data_available+0x100/0x100 [ 30.143716] ? release_sock+0x1e2/0x2b0 [ 30.147678] ? __local_bh_enable_ip+0x161/0x230 [ 30.152331] ? __release_sock+0x3a0/0x3a0 [ 30.156461] ? smc_release+0x269/0x610 [ 30.160330] ? trace_hardirqs_on+0xd/0x10 [ 30.164460] ? __local_bh_enable_ip+0x161/0x230 [ 30.169112] smc_release+0x36e/0x610 [ 30.172813] sock_release+0x96/0x1b0 [ 30.176509] ? sock_alloc_file+0x4e0/0x4e0 [ 30.180742] sock_close+0x16/0x20 [ 30.184179] __fput+0x34d/0x890 [ 30.187442] ? fput+0x1a0/0x1a0 [ 30.190705] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.195184] ____fput+0x15/0x20 [ 30.198446] task_work_run+0x1e4/0x290 [ 30.202316] ? task_work_cancel+0x240/0x240 [ 30.206626] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.212148] ? switch_task_namespaces+0xa2/0xd0 [ 30.216801] do_exit+0x1aee/0x2730 [ 30.220345] ? mm_update_next_owner+0x980/0x980 [ 30.224995] ? lock_downgrade+0x8e0/0x8e0 [ 30.229131] ? noop_count+0x40/0x40 [ 30.232739] ? lock_pin_lock+0x350/0x350 [ 30.236782] ? kasan_check_read+0x11/0x20 [ 30.240911] ? rcu_is_watching+0x85/0x140 [ 30.245049] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 30.250224] ? is_bpf_text_address+0xd7/0x170 [ 30.254704] ? check_usage_backwards+0x151/0x3a0 [ 30.259442] ? graph_lock+0x170/0x170 [ 30.263223] ? graph_lock+0x170/0x170 [ 30.267034] ? find_held_lock+0x36/0x1c0 [ 30.271086] ? lock_downgrade+0x8e0/0x8e0 [ 30.275216] ? kasan_check_read+0x11/0x20 [ 30.279346] ? do_raw_spin_unlock+0x9e/0x2e0 [ 30.283748] ? __local_bh_enable_ip+0x161/0x230 [ 30.288401] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.293923] ? release_sock+0x1e2/0x2b0 [ 30.297883] ? trace_hardirqs_on+0xd/0x10 [ 30.302032] ? __local_bh_enable_ip+0x161/0x230 [ 30.306694] ? _raw_spin_unlock_bh+0x30/0x40 [ 30.311084] ? release_sock+0x1e2/0x2b0 [ 30.315048] ? __release_sock+0x3a0/0x3a0 [ 30.319186] ? __local_bh_enable_ip+0x161/0x230 [ 30.323866] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 30.329046] ? smc_setsockopt+0x1ed/0x6d0 [ 30.333182] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.338702] ? __sys_setsockopt+0x24f/0x390 [ 30.343013] do_group_exit+0x16f/0x430 [ 30.346899] ? mm_fault_error+0x380/0x380 [ 30.351036] ? __ia32_sys_exit+0x50/0x50 [ 30.355098] ? do_syscall_64+0x92/0x800 [ 30.359056] __x64_sys_exit_group+0x3e/0x50 [ 30.363360] do_syscall_64+0x1b1/0x800 [ 30.367230] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 30.372069] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.376978] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.381892] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.387239] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.392425] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.397600] RIP: 0033:0x43e8d8 [ 30.400767] RSP: 002b:00007ffe8d8b3f68 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 30.408454] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 30.415715] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 30.422976] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 30.430226] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 30.437475] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 30.445451] Dumping ftrace buffer: [ 30.449085] (ftrace buffer empty) [ 30.452780] Kernel Offset: disabled [ 30.456406] Rebooting in 86400 seconds..