[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.445609] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.456636] random: sshd: uninitialized urandom read (32 bytes read) [ 22.780879] random: sshd: uninitialized urandom read (32 bytes read) [ 23.551201] random: sshd: uninitialized urandom read (32 bytes read) [ 23.707277] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.34' (ECDSA) to the list of known hosts. [ 29.333990] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.423520] WARNING: CPU: 1 PID: 4489 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 29.431893] Kernel panic - not syncing: panic_on_warn set ... [ 29.431893] [ 29.439238] CPU: 1 PID: 4489 Comm: syz-executor416 Not tainted 4.17.0-rc3+ #33 [ 29.446573] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.455901] Call Trace: [ 29.458469] dump_stack+0x1b9/0x294 [ 29.462075] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.467248] ? smc_unhash_sk+0x270/0x4a0 [ 29.471295] panic+0x22f/0x4de [ 29.474467] ? add_taint.cold.5+0x16/0x16 [ 29.478597] ? __warn.cold.8+0x148/0x1b3 [ 29.482633] ? __warn.cold.8+0x117/0x1b3 [ 29.486674] ? smc_unhash_sk+0x345/0x4a0 [ 29.490715] __warn.cold.8+0x163/0x1b3 [ 29.494587] ? smc_unhash_sk+0x345/0x4a0 [ 29.498627] report_bug+0x252/0x2d0 [ 29.502233] do_error_trap+0x1de/0x490 [ 29.506106] ? graph_lock+0x170/0x170 [ 29.509885] ? math_error+0x420/0x420 [ 29.513666] ? lock_acquire+0x1dc/0x520 [ 29.517620] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.522443] do_invalid_op+0x1b/0x20 [ 29.526138] invalid_op+0x14/0x20 [ 29.529569] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 29.534212] RSP: 0018:ffff8801ad4e7488 EFLAGS: 00010293 [ 29.539554] RAX: ffff8801ad9ea700 RBX: ffff8801add847c0 RCX: ffffffff873fe71e [ 29.546801] RDX: 0000000000000000 RSI: ffffffff873fe7d5 RDI: 0000000000000005 [ 29.554051] RBP: ffff8801ad4e7570 R08: ffff8801ad9ea700 R09: ffffed0035bb0908 [ 29.561307] R10: ffffed0035bb0908 R11: ffff8801add84843 R12: 1ffff10035a9ce95 [ 29.568570] R13: ffff8801ad4e7548 R14: ffffffff8970e4e0 R15: ffff8801add84840 [ 29.575831] ? smc_unhash_sk+0x28e/0x4a0 [ 29.579868] ? smc_unhash_sk+0x345/0x4a0 [ 29.583908] ? smc_unhash_sk+0x345/0x4a0 [ 29.587949] ? smc_rx_data_available+0x100/0x100 [ 29.592689] ? release_sock+0x1e2/0x2b0 [ 29.596648] ? __local_bh_enable_ip+0x161/0x230 [ 29.601295] ? __release_sock+0x3a0/0x3a0 [ 29.605434] ? smc_release+0x269/0x610 [ 29.609836] ? trace_hardirqs_on+0xd/0x10 [ 29.613964] ? __local_bh_enable_ip+0x161/0x230 [ 29.618612] smc_release+0x36e/0x610 [ 29.622310] sock_release+0x96/0x1b0 [ 29.626014] ? sock_alloc_file+0x4e0/0x4e0 [ 29.630238] sock_close+0x16/0x20 [ 29.633672] __fput+0x34d/0x890 [ 29.636939] ? fput+0x1a0/0x1a0 [ 29.640199] ? _raw_spin_unlock_irq+0x27/0x70 [ 29.644680] ____fput+0x15/0x20 [ 29.647942] task_work_run+0x1e4/0x290 [ 29.651809] ? task_work_cancel+0x240/0x240 [ 29.656118] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 29.661636] ? switch_task_namespaces+0xa2/0xd0 [ 29.666286] do_exit+0x1aee/0x2730 [ 29.669812] ? mm_update_next_owner+0x980/0x980 [ 29.674460] ? lock_downgrade+0x8e0/0x8e0 [ 29.678585] ? noop_count+0x40/0x40 [ 29.682190] ? lock_pin_lock+0x350/0x350 [ 29.686232] ? kasan_check_read+0x11/0x20 [ 29.690357] ? rcu_is_watching+0x85/0x140 [ 29.694487] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 29.699668] ? is_bpf_text_address+0xd7/0x170 [ 29.704147] ? check_usage_backwards+0x151/0x3a0 [ 29.708881] ? graph_lock+0x170/0x170 [ 29.712668] ? graph_lock+0x170/0x170 [ 29.716461] ? find_held_lock+0x36/0x1c0 [ 29.720507] ? lock_downgrade+0x8e0/0x8e0 [ 29.724637] ? kasan_check_read+0x11/0x20 [ 29.728770] ? do_raw_spin_unlock+0x9e/0x2e0 [ 29.733159] ? __local_bh_enable_ip+0x161/0x230 [ 29.737806] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.742800] ? release_sock+0x1e2/0x2b0 [ 29.746751] ? trace_hardirqs_on+0xd/0x10 [ 29.750879] ? __local_bh_enable_ip+0x161/0x230 [ 29.755529] ? _raw_spin_unlock_bh+0x30/0x40 [ 29.759920] ? release_sock+0x1e2/0x2b0 [ 29.763874] ? __release_sock+0x3a0/0x3a0 [ 29.768001] ? __local_bh_enable_ip+0x161/0x230 [ 29.772672] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 29.777846] ? smc_setsockopt+0x1ed/0x630 [ 29.781977] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.787504] ? __sys_setsockopt+0x24f/0x390 [ 29.791812] do_group_exit+0x16f/0x430 [ 29.795682] ? mm_fault_error+0x380/0x380 [ 29.799813] ? __ia32_sys_exit+0x50/0x50 [ 29.803858] ? do_syscall_64+0x92/0x800 [ 29.807822] __x64_sys_exit_group+0x3e/0x50 [ 29.812123] do_syscall_64+0x1b1/0x800 [ 29.815993] ? syscall_return_slowpath+0x5c0/0x5c0 [ 29.820906] ? syscall_return_slowpath+0x30f/0x5c0 [ 29.825818] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 29.831163] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.835989] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 29.841159] RIP: 0033:0x43e8d8 [ 29.844327] RSP: 002b:00007ffe004c3078 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 29.852021] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 29.859276] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 29.866535] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 29.873782] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 29.881036] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 29.888890] Dumping ftrace buffer: [ 29.892505] (ftrace buffer empty) [ 29.896193] Kernel Offset: disabled [ 29.899803] Rebooting in 86400 seconds..