[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.310270] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.524602] random: sshd: uninitialized urandom read (32 bytes read) [ 23.752452] random: sshd: uninitialized urandom read (32 bytes read) [ 24.442920] random: sshd: uninitialized urandom read (32 bytes read) [ 41.751131] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.13' (ECDSA) to the list of known hosts. [ 47.239824] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 47.328579] WARNING: CPU: 0 PID: 4485 at include/net/sock.h:639 smc_unhash_sk+0x345/0x4a0 [ 47.336958] Kernel panic - not syncing: panic_on_warn set ... [ 47.336958] [ 47.344302] CPU: 0 PID: 4485 Comm: syz-executor787 Not tainted 4.17.0-rc2+ #23 [ 47.351634] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.360968] Call Trace: [ 47.363538] dump_stack+0x1b9/0x294 [ 47.367143] ? dump_stack_print_info.cold.2+0x52/0x52 [ 47.372313] ? smc_unhash_sk+0x2d0/0x4a0 [ 47.376353] panic+0x22f/0x4de [ 47.379524] ? add_taint.cold.5+0x16/0x16 [ 47.383655] ? __warn.cold.8+0x148/0x1b3 [ 47.387692] ? __warn.cold.8+0x117/0x1b3 [ 47.391731] ? smc_unhash_sk+0x345/0x4a0 [ 47.395770] __warn.cold.8+0x163/0x1b3 [ 47.399641] ? smc_unhash_sk+0x345/0x4a0 [ 47.403702] report_bug+0x252/0x2d0 [ 47.407325] do_error_trap+0x1de/0x490 [ 47.411193] ? graph_lock+0x170/0x170 [ 47.415064] ? math_error+0x420/0x420 [ 47.418861] ? lock_acquire+0x1dc/0x520 [ 47.422842] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 47.427684] do_invalid_op+0x1b/0x20 [ 47.431380] invalid_op+0x14/0x20 [ 47.434810] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 47.439454] RSP: 0018:ffff8801afa8f488 EFLAGS: 00010293 [ 47.444796] RAX: ffff8801aa92e780 RBX: ffff8801af42e7c0 RCX: ffffffff873f89be [ 47.452043] RDX: 0000000000000000 RSI: ffffffff873f8a75 RDI: 0000000000000005 [ 47.460364] RBP: ffff8801afa8f570 R08: ffff8801aa92e780 R09: ffffed0035e85d08 [ 47.467612] R10: ffffed0035e85d08 R11: ffff8801af42e843 R12: 1ffff10035f51e95 [ 47.474862] R13: ffff8801afa8f548 R14: ffffffff8970dea0 R15: ffff8801af42e840 [ 47.482119] ? smc_unhash_sk+0x28e/0x4a0 [ 47.486164] ? smc_unhash_sk+0x345/0x4a0 [ 47.490208] ? smc_unhash_sk+0x345/0x4a0 [ 47.494249] ? smc_hash_sk+0x2f0/0x2f0 [ 47.498120] ? release_sock+0x1e2/0x2b0 [ 47.502077] ? __local_bh_enable_ip+0x161/0x230 [ 47.506727] ? __release_sock+0x3a0/0x3a0 [ 47.510854] ? smc_release+0x269/0x610 [ 47.514721] ? trace_hardirqs_on+0xd/0x10 [ 47.518845] ? __local_bh_enable_ip+0x161/0x230 [ 47.523492] smc_release+0x36e/0x610 [ 47.527189] sock_release+0x96/0x1b0 [ 47.530882] ? sock_alloc_file+0x4e0/0x4e0 [ 47.535100] sock_close+0x16/0x20 [ 47.538534] __fput+0x34d/0x890 [ 47.541794] ? fput+0x1a0/0x1a0 [ 47.545055] ? _raw_spin_unlock_irq+0x27/0x70 [ 47.549531] ____fput+0x15/0x20 [ 47.552792] task_work_run+0x1e4/0x290 [ 47.556659] ? task_work_cancel+0x240/0x240 [ 47.560965] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 47.566485] ? switch_task_namespaces+0xa2/0xd0 [ 47.571136] do_exit+0x1aee/0x2730 [ 47.574663] ? mm_update_next_owner+0x980/0x980 [ 47.579320] ? lock_downgrade+0x8e0/0x8e0 [ 47.583446] ? noop_count+0x40/0x40 [ 47.587051] ? lock_pin_lock+0x350/0x350 [ 47.591111] ? kasan_check_read+0x11/0x20 [ 47.595238] ? rcu_is_watching+0x85/0x140 [ 47.599365] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 47.604537] ? is_bpf_text_address+0xd7/0x170 [ 47.609014] ? check_usage_backwards+0x151/0x3a0 [ 47.613750] ? graph_lock+0x170/0x170 [ 47.617532] ? graph_lock+0x170/0x170 [ 47.621315] ? find_held_lock+0x36/0x1c0 [ 47.625363] ? lock_downgrade+0x8e0/0x8e0 [ 47.629491] ? kasan_check_read+0x11/0x20 [ 47.633619] ? do_raw_spin_unlock+0x9e/0x2e0 [ 47.638009] ? __local_bh_enable_ip+0x161/0x230 [ 47.642659] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 47.647657] ? release_sock+0x1e2/0x2b0 [ 47.651609] ? trace_hardirqs_on+0xd/0x10 [ 47.655735] ? __local_bh_enable_ip+0x161/0x230 [ 47.660383] ? _raw_spin_unlock_bh+0x30/0x40 [ 47.664773] ? release_sock+0x1e2/0x2b0 [ 47.668726] ? __release_sock+0x3a0/0x3a0 [ 47.672856] ? __local_bh_enable_ip+0x161/0x230 [ 47.677505] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 47.682700] ? smc_setsockopt+0x1ed/0x630 [ 47.686828] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.692346] ? __sys_setsockopt+0x24f/0x390 [ 47.696649] do_group_exit+0x16f/0x430 [ 47.700518] ? mm_fault_error+0x380/0x380 [ 47.704644] ? __ia32_sys_exit+0x50/0x50 [ 47.708686] ? do_syscall_64+0x92/0x800 [ 47.712642] __x64_sys_exit_group+0x3e/0x50 [ 47.716940] do_syscall_64+0x1b1/0x800 [ 47.720806] ? syscall_return_slowpath+0x5c0/0x5c0 [ 47.725715] ? syscall_return_slowpath+0x30f/0x5c0 [ 47.730625] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 47.735968] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 47.740791] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 47.745955] RIP: 0033:0x43e8d8 [ 47.749120] RSP: 002b:00007ffd76c694c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 47.756805] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 47.764136] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 47.771385] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 47.778635] R10: 0000000020000080 R11: 0000000000000246 R12: 0000000000000001 [ 47.785885] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 47.793632] Dumping ftrace buffer: [ 47.797239] (ftrace buffer empty) [ 47.800927] Kernel Offset: disabled [ 47.804535] Rebooting in 86400 seconds..