[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.249387] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.824206] random: sshd: uninitialized urandom read (32 bytes read) [ 23.035192] random: sshd: uninitialized urandom read (32 bytes read) [ 23.777985] random: sshd: uninitialized urandom read (32 bytes read) [ 47.294732] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.12' (ECDSA) to the list of known hosts. [ 52.693793] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 52.794126] WARNING: CPU: 0 PID: 4494 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 52.802518] Kernel panic - not syncing: panic_on_warn set ... [ 52.802518] [ 52.809865] CPU: 0 PID: 4494 Comm: syz-executor865 Not tainted 4.17.0-rc4+ #50 [ 52.817210] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.826539] Call Trace: [ 52.829110] dump_stack+0x1b9/0x294 [ 52.832717] ? dump_stack_print_info.cold.2+0x52/0x52 [ 52.837891] ? smc_unhash_sk+0x2f0/0x4a0 [ 52.841932] panic+0x22f/0x4de [ 52.845103] ? add_taint.cold.5+0x16/0x16 [ 52.849250] ? __warn.cold.8+0x148/0x1b3 [ 52.853289] ? __warn.cold.8+0x117/0x1b3 [ 52.857328] ? smc_unhash_sk+0x345/0x4a0 [ 52.861365] __warn.cold.8+0x163/0x1b3 [ 52.865228] ? smc_unhash_sk+0x345/0x4a0 [ 52.869266] report_bug+0x252/0x2d0 [ 52.872874] do_error_trap+0x1de/0x490 [ 52.876738] ? graph_lock+0x170/0x170 [ 52.880521] ? math_error+0x420/0x420 [ 52.884305] ? lock_acquire+0x1dc/0x520 [ 52.888262] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 52.893091] do_invalid_op+0x1b/0x20 [ 52.896793] invalid_op+0x14/0x20 [ 52.900230] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 52.904881] RSP: 0018:ffff8801b036f488 EFLAGS: 00010293 [ 52.910231] RAX: ffff8801ad45a0c0 RBX: ffff8801ae7e97c0 RCX: ffffffff8740fa9e [ 52.917485] RDX: 0000000000000000 RSI: ffffffff8740fb55 RDI: 0000000000000005 [ 52.924734] RBP: ffff8801b036f570 R08: ffff8801ad45a0c0 R09: ffffed0035cfd308 [ 52.931999] R10: ffffed0035cfd308 R11: ffff8801ae7e9843 R12: 1ffff1003606de95 [ 52.939248] R13: ffff8801b036f548 R14: ffffffff8970dc60 R15: ffff8801ae7e9840 [ 52.946507] ? smc_unhash_sk+0x28e/0x4a0 [ 52.950559] ? smc_unhash_sk+0x345/0x4a0 [ 52.954599] ? smc_unhash_sk+0x345/0x4a0 [ 52.958651] ? smc_rx_data_available+0x100/0x100 [ 52.963408] ? release_sock+0x1e2/0x2b0 [ 52.967362] ? __local_bh_enable_ip+0x161/0x230 [ 52.972008] ? __release_sock+0x3a0/0x3a0 [ 52.976146] ? smc_release+0x269/0x610 [ 52.980020] ? trace_hardirqs_on+0xd/0x10 [ 52.984147] ? __local_bh_enable_ip+0x161/0x230 [ 52.988804] smc_release+0x36e/0x610 [ 52.992520] sock_release+0x96/0x1b0 [ 52.996212] ? sock_alloc_file+0x4e0/0x4e0 [ 53.000432] sock_close+0x16/0x20 [ 53.003881] __fput+0x34d/0x890 [ 53.007151] ? fput+0x1a0/0x1a0 [ 53.010411] ? _raw_spin_unlock_irq+0x27/0x70 [ 53.014890] ____fput+0x15/0x20 [ 53.018149] task_work_run+0x1e4/0x290 [ 53.022017] ? task_work_cancel+0x240/0x240 [ 53.026334] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 53.031861] ? switch_task_namespaces+0xa2/0xd0 [ 53.036516] do_exit+0x1aee/0x2730 [ 53.040042] ? mm_update_next_owner+0x980/0x980 [ 53.044691] ? lock_downgrade+0x8e0/0x8e0 [ 53.048816] ? noop_count+0x40/0x40 [ 53.052421] ? lock_pin_lock+0x350/0x350 [ 53.056486] ? kasan_check_read+0x11/0x20 [ 53.060614] ? rcu_is_watching+0x85/0x140 [ 53.064745] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 53.070101] ? is_bpf_text_address+0xd7/0x170 [ 53.074576] ? check_usage_backwards+0x151/0x3a0 [ 53.079312] ? graph_lock+0x170/0x170 [ 53.083090] ? graph_lock+0x170/0x170 [ 53.086872] ? find_held_lock+0x36/0x1c0 [ 53.090928] ? lock_downgrade+0x8e0/0x8e0 [ 53.095059] ? kasan_check_read+0x11/0x20 [ 53.099194] ? do_raw_spin_unlock+0x9e/0x2e0 [ 53.103599] ? __local_bh_enable_ip+0x161/0x230 [ 53.108251] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 53.113260] ? release_sock+0x1e2/0x2b0 [ 53.117218] ? trace_hardirqs_on+0xd/0x10 [ 53.121347] ? __local_bh_enable_ip+0x161/0x230 [ 53.125998] ? _raw_spin_unlock_bh+0x30/0x40 [ 53.130388] ? release_sock+0x1e2/0x2b0 [ 53.134341] ? __release_sock+0x3a0/0x3a0 [ 53.138468] ? __local_bh_enable_ip+0x161/0x230 [ 53.143118] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 53.148293] ? smc_setsockopt+0x1ed/0x6d0 [ 53.152427] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.157952] ? __sys_setsockopt+0x24f/0x390 [ 53.162254] do_group_exit+0x16f/0x430 [ 53.166119] ? mm_fault_error+0x380/0x380 [ 53.170245] ? __ia32_sys_exit+0x50/0x50 [ 53.174289] ? do_syscall_64+0x92/0x800 [ 53.178252] __x64_sys_exit_group+0x3e/0x50 [ 53.182552] do_syscall_64+0x1b1/0x800 [ 53.186419] ? syscall_return_slowpath+0x5c0/0x5c0 [ 53.191339] ? syscall_return_slowpath+0x30f/0x5c0 [ 53.196251] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 53.201598] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 53.206425] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.211599] RIP: 0033:0x43e8d8 [ 53.214767] RSP: 002b:00007ffd937a6208 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 53.222454] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 53.229703] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 53.236951] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 53.244208] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 53.251461] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 53.259394] Dumping ftrace buffer: [ 53.263014] (ftrace buffer empty) [ 53.266708] Kernel Offset: disabled [ 53.270326] Rebooting in 86400 seconds..