[....] Starting OpenBSD Secure Shell server: sshd[ 18.814492] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.332546] random: sshd: uninitialized urandom read (32 bytes read) [ 20.503136] sshd (4478) used greatest stack depth: 16648 bytes left [ 20.522307] random: sshd: uninitialized urandom read (32 bytes read) [ 21.273553] random: sshd: uninitialized urandom read (32 bytes read) [ 21.439521] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.16' (ECDSA) to the list of known hosts. [ 26.878610] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 26.975839] WARNING: CPU: 1 PID: 4494 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 26.984266] Kernel panic - not syncing: panic_on_warn set ... [ 26.984266] [ 26.991633] CPU: 1 PID: 4494 Comm: syz-executor381 Not tainted 4.17.0-rc3+ #33 [ 26.999765] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.009157] Call Trace: [ 27.011751] dump_stack+0x1b9/0x294 [ 27.015379] ? dump_stack_print_info.cold.2+0x52/0x52 [ 27.020574] ? smc_unhash_sk+0x270/0x4a0 [ 27.024630] panic+0x22f/0x4de [ 27.027816] ? add_taint.cold.5+0x16/0x16 [ 27.031958] ? __warn.cold.8+0x148/0x1b3 [ 27.036013] ? __warn.cold.8+0x117/0x1b3 [ 27.040074] ? smc_unhash_sk+0x345/0x4a0 [ 27.044124] __warn.cold.8+0x163/0x1b3 [ 27.048005] ? smc_unhash_sk+0x345/0x4a0 [ 27.052073] report_bug+0x252/0x2d0 [ 27.055706] do_error_trap+0x1de/0x490 [ 27.059591] ? graph_lock+0x170/0x170 [ 27.063396] ? math_error+0x420/0x420 [ 27.067197] ? lock_acquire+0x1dc/0x520 [ 27.071170] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.076012] do_invalid_op+0x1b/0x20 [ 27.079739] invalid_op+0x14/0x20 [ 27.083191] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 27.087845] RSP: 0018:ffff8801b3e7f488 EFLAGS: 00010293 [ 27.093199] RAX: ffff8801aff22680 RBX: ffff8801afe1a7c0 RCX: ffffffff873fe71e [ 27.100457] RDX: 0000000000000000 RSI: ffffffff873fe7d5 RDI: 0000000000000005 [ 27.107720] RBP: ffff8801b3e7f570 R08: ffff8801aff22680 R09: ffffed0035fc3508 [ 27.114979] R10: ffffed0035fc3508 R11: ffff8801afe1a843 R12: 1ffff100367cfe95 [ 27.122244] R13: ffff8801b3e7f548 R14: ffffffff8970e4e0 R15: ffff8801afe1a840 [ 27.129527] ? smc_unhash_sk+0x28e/0x4a0 [ 27.133591] ? smc_unhash_sk+0x345/0x4a0 [ 27.137646] ? smc_unhash_sk+0x345/0x4a0 [ 27.141704] ? smc_rx_data_available+0x100/0x100 [ 27.146457] ? release_sock+0x1e2/0x2b0 [ 27.150424] ? __local_bh_enable_ip+0x161/0x230 [ 27.155107] ? __release_sock+0x3a0/0x3a0 [ 27.159295] ? smc_release+0x269/0x610 [ 27.163216] ? trace_hardirqs_on+0xd/0x10 [ 27.167373] ? __local_bh_enable_ip+0x161/0x230 [ 27.172050] smc_release+0x36e/0x610 [ 27.175776] sock_release+0x96/0x1b0 [ 27.179512] ? sock_alloc_file+0x4e0/0x4e0 [ 27.183752] sock_close+0x16/0x20 [ 27.187200] __fput+0x34d/0x890 [ 27.190480] ? fput+0x1a0/0x1a0 [ 27.193760] ? _raw_spin_unlock_irq+0x27/0x70 [ 27.198256] ____fput+0x15/0x20 [ 27.201530] task_work_run+0x1e4/0x290 [ 27.205420] ? task_work_cancel+0x240/0x240 [ 27.209743] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 27.215296] ? switch_task_namespaces+0xa2/0xd0 [ 27.219962] do_exit+0x1aee/0x2730 [ 27.223492] ? mm_update_next_owner+0x980/0x980 [ 27.228146] ? lock_downgrade+0x8e0/0x8e0 [ 27.232281] ? noop_count+0x40/0x40 [ 27.235906] ? lock_pin_lock+0x350/0x350 [ 27.239964] ? kasan_check_read+0x11/0x20 [ 27.244110] ? rcu_is_watching+0x85/0x140 [ 27.248269] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 27.253465] ? is_bpf_text_address+0xd7/0x170 [ 27.257956] ? check_usage_backwards+0x151/0x3a0 [ 27.262707] ? graph_lock+0x170/0x170 [ 27.266495] ? graph_lock+0x170/0x170 [ 27.270307] ? find_held_lock+0x36/0x1c0 [ 27.274365] ? lock_downgrade+0x8e0/0x8e0 [ 27.278509] ? kasan_check_read+0x11/0x20 [ 27.282647] ? do_raw_spin_unlock+0x9e/0x2e0 [ 27.287052] ? __local_bh_enable_ip+0x161/0x230 [ 27.291713] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.296726] ? release_sock+0x1e2/0x2b0 [ 27.300698] ? trace_hardirqs_on+0xd/0x10 [ 27.304843] ? __local_bh_enable_ip+0x161/0x230 [ 27.309517] ? _raw_spin_unlock_bh+0x30/0x40 [ 27.313919] ? release_sock+0x1e2/0x2b0 [ 27.317890] ? __release_sock+0x3a0/0x3a0 [ 27.322045] ? __local_bh_enable_ip+0x161/0x230 [ 27.326729] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 27.331914] ? smc_setsockopt+0x1ed/0x630 [ 27.336067] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.341601] ? __sys_setsockopt+0x24f/0x390 [ 27.345930] do_group_exit+0x16f/0x430 [ 27.349816] ? mm_fault_error+0x380/0x380 [ 27.353957] ? __ia32_sys_exit+0x50/0x50 [ 27.358006] ? do_syscall_64+0x92/0x800 [ 27.361977] __x64_sys_exit_group+0x3e/0x50 [ 27.366287] do_syscall_64+0x1b1/0x800 [ 27.370162] ? syscall_return_slowpath+0x5c0/0x5c0 [ 27.375083] ? syscall_return_slowpath+0x30f/0x5c0 [ 27.380009] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 27.385378] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.390216] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 27.395398] RIP: 0033:0x43e8b8 [ 27.398569] RSP: 002b:00007fff94fdc5c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 27.406271] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8b8 [ 27.413530] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 27.420786] RBP: 00000000004be260 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 27.428047] R10: 0000000020000200 R11: 0000000000000246 R12: 0000000000000001 [ 27.435315] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 27.443313] Dumping ftrace buffer: [ 27.447002] (ftrace buffer empty) [ 27.450696] Kernel Offset: disabled [ 27.454319] Rebooting in 86400 seconds..