[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.918094] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.797294] random: sshd: uninitialized urandom read (32 bytes read) [ 22.199672] random: sshd: uninitialized urandom read (32 bytes read) [ 22.932547] random: sshd: uninitialized urandom read (32 bytes read) [ 27.357950] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.45' (ECDSA) to the list of known hosts. [ 32.838505] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.929097] WARNING: CPU: 1 PID: 4536 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 32.937473] Kernel panic - not syncing: panic_on_warn set ... [ 32.937473] [ 32.944827] CPU: 1 PID: 4536 Comm: syz-executor010 Not tainted 4.17.0-rc6+ #60 [ 32.952164] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.961496] Call Trace: [ 32.964072] dump_stack+0x1b9/0x294 [ 32.967690] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.972870] ? smc_unhash_sk+0x270/0x4a0 [ 32.976910] panic+0x22f/0x4de [ 32.980087] ? add_taint.cold.5+0x16/0x16 [ 32.984226] ? __warn.cold.8+0x148/0x1b3 [ 32.988268] ? __warn.cold.8+0x117/0x1b3 [ 32.992309] ? smc_unhash_sk+0x345/0x4a0 [ 32.996350] __warn.cold.8+0x163/0x1b3 [ 33.000217] ? smc_unhash_sk+0x345/0x4a0 [ 33.004260] report_bug+0x252/0x2d0 [ 33.007872] do_error_trap+0x1de/0x490 [ 33.011738] ? graph_lock+0x170/0x170 [ 33.015520] ? math_error+0x420/0x420 [ 33.019302] ? lock_acquire+0x1dc/0x520 [ 33.023258] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.028082] do_invalid_op+0x1b/0x20 [ 33.031780] invalid_op+0x14/0x20 [ 33.035213] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 33.039870] RSP: 0018:ffff8801ad6c7488 EFLAGS: 00010293 [ 33.045210] RAX: ffff8801ad7da380 RBX: ffff8801adb9a7c0 RCX: ffffffff8741d11e [ 33.052459] RDX: 0000000000000000 RSI: ffffffff8741d1d5 RDI: 0000000000000005 [ 33.059709] RBP: ffff8801ad6c7570 R08: ffff8801ad7da380 R09: ffffed0035b73508 [ 33.066957] R10: ffffed0035b73508 R11: ffff8801adb9a843 R12: 1ffff10035ad8e95 [ 33.074217] R13: ffff8801ad6c7548 R14: ffffffff8970e020 R15: ffff8801adb9a840 [ 33.081481] ? smc_unhash_sk+0x28e/0x4a0 [ 33.085524] ? smc_unhash_sk+0x345/0x4a0 [ 33.089580] ? smc_unhash_sk+0x345/0x4a0 [ 33.093628] ? smc_rx_data_available+0x100/0x100 [ 33.098377] ? release_sock+0x1e2/0x2b0 [ 33.102355] ? __local_bh_enable_ip+0x161/0x230 [ 33.107013] ? __release_sock+0x3a0/0x3a0 [ 33.111155] ? smc_release+0x269/0x610 [ 33.115033] ? trace_hardirqs_on+0xd/0x10 [ 33.119167] ? __local_bh_enable_ip+0x161/0x230 [ 33.123825] smc_release+0x36e/0x610 [ 33.127529] sock_release+0x96/0x1b0 [ 33.131223] ? sock_alloc_file+0x4e0/0x4e0 [ 33.135441] sock_close+0x16/0x20 [ 33.138878] __fput+0x34d/0x890 [ 33.142139] ? fput+0x1a0/0x1a0 [ 33.145405] ? _raw_spin_unlock_irq+0x27/0x70 [ 33.149891] ____fput+0x15/0x20 [ 33.153152] task_work_run+0x1e4/0x290 [ 33.157027] ? task_work_cancel+0x240/0x240 [ 33.161338] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 33.166865] ? switch_task_namespaces+0xa2/0xd0 [ 33.171543] do_exit+0x1aee/0x2730 [ 33.175070] ? mm_update_next_owner+0x980/0x980 [ 33.179721] ? lock_downgrade+0x8e0/0x8e0 [ 33.183850] ? noop_count+0x40/0x40 [ 33.187465] ? lock_pin_lock+0x350/0x350 [ 33.191510] ? kasan_check_read+0x11/0x20 [ 33.195640] ? rcu_is_watching+0x85/0x140 [ 33.199770] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 33.204943] ? is_bpf_text_address+0xd7/0x170 [ 33.209420] ? check_usage_backwards+0x151/0x3a0 [ 33.214153] ? graph_lock+0x170/0x170 [ 33.217933] ? graph_lock+0x170/0x170 [ 33.221719] ? find_held_lock+0x36/0x1c0 [ 33.225770] ? lock_downgrade+0x8e0/0x8e0 [ 33.229903] ? kasan_check_read+0x11/0x20 [ 33.234038] ? do_raw_spin_unlock+0x9e/0x2e0 [ 33.238428] ? __local_bh_enable_ip+0x161/0x230 [ 33.243075] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 33.248074] ? release_sock+0x1e2/0x2b0 [ 33.252035] ? trace_hardirqs_on+0xd/0x10 [ 33.256176] ? __local_bh_enable_ip+0x161/0x230 [ 33.260834] ? _raw_spin_unlock_bh+0x30/0x40 [ 33.265232] ? release_sock+0x1e2/0x2b0 [ 33.269198] ? __release_sock+0x3a0/0x3a0 [ 33.273343] ? __local_bh_enable_ip+0x161/0x230 [ 33.278011] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 33.283195] ? smc_setsockopt+0x1ed/0x6d0 [ 33.287328] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.292846] ? __sys_setsockopt+0x24f/0x390 [ 33.297154] do_group_exit+0x16f/0x430 [ 33.301029] ? mm_fault_error+0x380/0x380 [ 33.305161] ? __ia32_sys_exit+0x50/0x50 [ 33.309206] ? do_syscall_64+0x92/0x800 [ 33.313162] __x64_sys_exit_group+0x3e/0x50 [ 33.317465] do_syscall_64+0x1b1/0x800 [ 33.321338] ? syscall_return_slowpath+0x5c0/0x5c0 [ 33.326261] ? syscall_return_slowpath+0x30f/0x5c0 [ 33.331177] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 33.336526] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.341361] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.346532] RIP: 0033:0x43e8c8 [ 33.349701] RSP: 002b:00007ffe6fd73288 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 33.357387] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8c8 [ 33.364634] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 33.371881] RBP: 00000000004be260 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 33.379139] R10: 00000000200000c0 R11: 0000000000000246 R12: 0000000000000001 [ 33.386392] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 33.394322] Dumping ftrace buffer: [ 33.397938] (ftrace buffer empty) [ 33.401634] Kernel Offset: disabled [ 33.405242] Rebooting in 86400 seconds..