[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.802393] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.714316] random: sshd: uninitialized urandom read (32 bytes read) [ 23.952785] random: sshd: uninitialized urandom read (32 bytes read) [ 24.701156] random: sshd: uninitialized urandom read (32 bytes read) [ 32.297529] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.14' (ECDSA) to the list of known hosts. [ 37.766833] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 37.862119] WARNING: CPU: 0 PID: 4491 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 37.870504] Kernel panic - not syncing: panic_on_warn set ... [ 37.870504] [ 37.877855] CPU: 0 PID: 4491 Comm: syz-executor026 Not tainted 4.17.0-rc3+ #33 [ 37.885193] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.894526] Call Trace: [ 37.897106] dump_stack+0x1b9/0x294 [ 37.900722] ? dump_stack_print_info.cold.2+0x52/0x52 [ 37.905920] ? smc_unhash_sk+0x270/0x4a0 [ 37.909964] panic+0x22f/0x4de [ 37.913138] ? add_taint.cold.5+0x16/0x16 [ 37.917269] ? __warn.cold.8+0x148/0x1b3 [ 37.921308] ? __warn.cold.8+0x117/0x1b3 [ 37.925352] ? smc_unhash_sk+0x345/0x4a0 [ 37.929399] __warn.cold.8+0x163/0x1b3 [ 37.933266] ? smc_unhash_sk+0x345/0x4a0 [ 37.937484] report_bug+0x252/0x2d0 [ 37.941099] do_error_trap+0x1de/0x490 [ 37.944967] ? graph_lock+0x170/0x170 [ 37.948749] ? math_error+0x420/0x420 [ 37.952545] ? lock_acquire+0x1dc/0x520 [ 37.956501] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.961326] do_invalid_op+0x1b/0x20 [ 37.965022] invalid_op+0x14/0x20 [ 37.968456] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 37.973104] RSP: 0018:ffff8801ad237488 EFLAGS: 00010293 [ 37.978448] RAX: ffff8801d9382380 RBX: ffff8801d90277c0 RCX: ffffffff873fe71e [ 37.985701] RDX: 0000000000000000 RSI: ffffffff873fe7d5 RDI: 0000000000000005 [ 37.992952] RBP: ffff8801ad237570 R08: ffff8801d9382380 R09: ffffed003b204f08 [ 38.000201] R10: ffffed003b204f08 R11: ffff8801d9027843 R12: 1ffff10035a46e95 [ 38.007452] R13: ffff8801ad237548 R14: ffffffff8970e4e0 R15: ffff8801d9027840 [ 38.014732] ? smc_unhash_sk+0x28e/0x4a0 [ 38.018776] ? smc_unhash_sk+0x345/0x4a0 [ 38.022825] ? smc_unhash_sk+0x345/0x4a0 [ 38.026878] ? smc_rx_data_available+0x100/0x100 [ 38.031616] ? release_sock+0x1e2/0x2b0 [ 38.035575] ? __local_bh_enable_ip+0x161/0x230 [ 38.040224] ? __release_sock+0x3a0/0x3a0 [ 38.044351] ? smc_release+0x269/0x610 [ 38.048217] ? trace_hardirqs_on+0xd/0x10 [ 38.052347] ? __local_bh_enable_ip+0x161/0x230 [ 38.057004] smc_release+0x36e/0x610 [ 38.060699] sock_release+0x96/0x1b0 [ 38.064566] ? sock_alloc_file+0x4e0/0x4e0 [ 38.068781] sock_close+0x16/0x20 [ 38.072218] __fput+0x34d/0x890 [ 38.075480] ? fput+0x1a0/0x1a0 [ 38.078749] ? _raw_spin_unlock_irq+0x27/0x70 [ 38.083226] ____fput+0x15/0x20 [ 38.086484] task_work_run+0x1e4/0x290 [ 38.090351] ? task_work_cancel+0x240/0x240 [ 38.094660] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 38.100178] ? switch_task_namespaces+0xa2/0xd0 [ 38.104830] do_exit+0x1aee/0x2730 [ 38.108354] ? mm_update_next_owner+0x980/0x980 [ 38.113088] ? lock_downgrade+0x8e0/0x8e0 [ 38.117215] ? noop_count+0x40/0x40 [ 38.120832] ? lock_pin_lock+0x350/0x350 [ 38.124883] ? kasan_check_read+0x11/0x20 [ 38.129013] ? rcu_is_watching+0x85/0x140 [ 38.133142] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 38.138312] ? is_bpf_text_address+0xd7/0x170 [ 38.142794] ? check_usage_backwards+0x151/0x3a0 [ 38.147533] ? graph_lock+0x170/0x170 [ 38.151312] ? graph_lock+0x170/0x170 [ 38.155095] ? find_held_lock+0x36/0x1c0 [ 38.159141] ? lock_downgrade+0x8e0/0x8e0 [ 38.163271] ? kasan_check_read+0x11/0x20 [ 38.167398] ? do_raw_spin_unlock+0x9e/0x2e0 [ 38.171788] ? __local_bh_enable_ip+0x161/0x230 [ 38.176435] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 38.181431] ? release_sock+0x1e2/0x2b0 [ 38.185381] ? trace_hardirqs_on+0xd/0x10 [ 38.189506] ? __local_bh_enable_ip+0x161/0x230 [ 38.194155] ? _raw_spin_unlock_bh+0x30/0x40 [ 38.198539] ? release_sock+0x1e2/0x2b0 [ 38.202491] ? __release_sock+0x3a0/0x3a0 [ 38.206619] ? __local_bh_enable_ip+0x161/0x230 [ 38.211273] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 38.216449] ? smc_setsockopt+0x1ed/0x630 [ 38.220579] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.226099] ? __sys_setsockopt+0x24f/0x390 [ 38.230406] do_group_exit+0x16f/0x430 [ 38.234282] ? mm_fault_error+0x380/0x380 [ 38.238406] ? __ia32_sys_exit+0x50/0x50 [ 38.242446] ? do_syscall_64+0x92/0x800 [ 38.246400] __x64_sys_exit_group+0x3e/0x50 [ 38.250710] do_syscall_64+0x1b1/0x800 [ 38.254585] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 38.259587] ? syscall_return_slowpath+0x5c0/0x5c0 [ 38.264497] ? syscall_return_slowpath+0x30f/0x5c0 [ 38.269418] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 38.274760] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.279684] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 38.284853] RIP: 0033:0x43e8d8 [ 38.288019] RSP: 002b:00007ffd07c3d178 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 38.295717] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 38.302969] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 38.310217] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 38.317463] R10: 00000000200001c0 R11: 0000000000000246 R12: 0000000000000001 [ 38.324796] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 38.332621] Dumping ftrace buffer: [ 38.336268] (ftrace buffer empty) [ 38.339959] Kernel Offset: disabled [ 38.343572] Rebooting in 86400 seconds..