[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.295167] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.110495] random: sshd: uninitialized urandom read (32 bytes read) [ 24.469363] random: sshd: uninitialized urandom read (32 bytes read) [ 25.155306] random: sshd: uninitialized urandom read (32 bytes read) [ 40.572419] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.20' (ECDSA) to the list of known hosts. [ 46.061253] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 46.159323] WARNING: CPU: 0 PID: 4494 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 46.167722] Kernel panic - not syncing: panic_on_warn set ... [ 46.167722] [ 46.175069] CPU: 0 PID: 4494 Comm: syz-executor657 Not tainted 4.17.0-rc3+ #33 [ 46.182405] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.191736] Call Trace: [ 46.194307] dump_stack+0x1b9/0x294 [ 46.197914] ? dump_stack_print_info.cold.2+0x52/0x52 [ 46.203182] ? smc_unhash_sk+0x270/0x4a0 [ 46.207225] panic+0x22f/0x4de [ 46.210399] ? add_taint.cold.5+0x16/0x16 [ 46.214525] ? __warn.cold.8+0x148/0x1b3 [ 46.218563] ? __warn.cold.8+0x117/0x1b3 [ 46.222604] ? smc_unhash_sk+0x345/0x4a0 [ 46.226641] __warn.cold.8+0x163/0x1b3 [ 46.230506] ? smc_unhash_sk+0x345/0x4a0 [ 46.234544] report_bug+0x252/0x2d0 [ 46.238160] do_error_trap+0x1de/0x490 [ 46.242025] ? graph_lock+0x170/0x170 [ 46.245800] ? math_error+0x420/0x420 [ 46.249581] ? lock_acquire+0x1dc/0x520 [ 46.253535] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 46.258355] do_invalid_op+0x1b/0x20 [ 46.262045] invalid_op+0x14/0x20 [ 46.265475] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 46.270120] RSP: 0018:ffff8801b0357488 EFLAGS: 00010293 [ 46.275464] RAX: ffff8801afd76180 RBX: ffff8801aff367c0 RCX: ffffffff873fe71e [ 46.282709] RDX: 0000000000000000 RSI: ffffffff873fe7d5 RDI: 0000000000000005 [ 46.289956] RBP: ffff8801b0357570 R08: ffff8801afd76180 R09: ffffed0035fe6d08 [ 46.297205] R10: ffffed0035fe6d08 R11: ffff8801aff36843 R12: 1ffff1003606ae95 [ 46.304452] R13: ffff8801b0357548 R14: ffffffff8970e4e0 R15: ffff8801aff36840 [ 46.311707] ? smc_unhash_sk+0x28e/0x4a0 [ 46.315742] ? smc_unhash_sk+0x345/0x4a0 [ 46.319782] ? smc_unhash_sk+0x345/0x4a0 [ 46.323822] ? smc_rx_data_available+0x100/0x100 [ 46.328558] ? release_sock+0x1e2/0x2b0 [ 46.332512] ? __local_bh_enable_ip+0x161/0x230 [ 46.337161] ? __release_sock+0x3a0/0x3a0 [ 46.341297] ? smc_release+0x269/0x610 [ 46.345165] ? trace_hardirqs_on+0xd/0x10 [ 46.349290] ? __local_bh_enable_ip+0x161/0x230 [ 46.353936] smc_release+0x36e/0x610 [ 46.357639] sock_release+0x96/0x1b0 [ 46.361330] ? sock_alloc_file+0x4e0/0x4e0 [ 46.365546] sock_close+0x16/0x20 [ 46.368980] __fput+0x34d/0x890 [ 46.372240] ? fput+0x1a0/0x1a0 [ 46.375502] ? _raw_spin_unlock_irq+0x27/0x70 [ 46.379979] ____fput+0x15/0x20 [ 46.383238] task_work_run+0x1e4/0x290 [ 46.387113] ? task_work_cancel+0x240/0x240 [ 46.391423] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 46.396941] ? switch_task_namespaces+0xa2/0xd0 [ 46.401589] do_exit+0x1aee/0x2730 [ 46.405113] ? mm_update_next_owner+0x980/0x980 [ 46.409762] ? lock_downgrade+0x8e0/0x8e0 [ 46.413886] ? noop_count+0x40/0x40 [ 46.417490] ? lock_pin_lock+0x350/0x350 [ 46.421538] ? kasan_check_read+0x11/0x20 [ 46.425665] ? rcu_is_watching+0x85/0x140 [ 46.429792] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 46.434961] ? is_bpf_text_address+0xd7/0x170 [ 46.439435] ? check_usage_backwards+0x151/0x3a0 [ 46.444170] ? graph_lock+0x170/0x170 [ 46.447946] ? graph_lock+0x170/0x170 [ 46.451731] ? find_held_lock+0x36/0x1c0 [ 46.455773] ? lock_downgrade+0x8e0/0x8e0 [ 46.459899] ? kasan_check_read+0x11/0x20 [ 46.464023] ? do_raw_spin_unlock+0x9e/0x2e0 [ 46.468409] ? __local_bh_enable_ip+0x161/0x230 [ 46.473063] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 46.478061] ? release_sock+0x1e2/0x2b0 [ 46.482015] ? trace_hardirqs_on+0xd/0x10 [ 46.486142] ? __local_bh_enable_ip+0x161/0x230 [ 46.490788] ? _raw_spin_unlock_bh+0x30/0x40 [ 46.495171] ? release_sock+0x1e2/0x2b0 [ 46.499122] ? __release_sock+0x3a0/0x3a0 [ 46.503251] ? __local_bh_enable_ip+0x161/0x230 [ 46.507898] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 46.513076] ? smc_setsockopt+0x1ed/0x630 [ 46.517211] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 46.522727] ? __sys_setsockopt+0x24f/0x390 [ 46.527029] do_group_exit+0x16f/0x430 [ 46.530893] ? mm_fault_error+0x380/0x380 [ 46.535018] ? __ia32_sys_exit+0x50/0x50 [ 46.539058] ? do_syscall_64+0x92/0x800 [ 46.543011] __x64_sys_exit_group+0x3e/0x50 [ 46.547306] do_syscall_64+0x1b1/0x800 [ 46.551172] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 46.555992] ? syscall_return_slowpath+0x5c0/0x5c0 [ 46.560899] ? syscall_return_slowpath+0x30f/0x5c0 [ 46.565809] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 46.571155] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 46.575976] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 46.581142] RIP: 0033:0x43e8d8 [ 46.584309] RSP: 002b:00007ffc2171fe38 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 46.591995] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 46.599240] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 46.606488] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 46.613732] R10: 0000000020000100 R11: 0000000000000246 R12: 0000000000000001 [ 46.620976] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 46.628671] Dumping ftrace buffer: [ 46.632261] (ftrace buffer empty) [ 46.635948] Kernel Offset: disabled [ 46.639558] Rebooting in 86400 seconds..