[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.870429] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.505365] random: sshd: uninitialized urandom read (32 bytes read) [ 24.896935] random: sshd: uninitialized urandom read (32 bytes read) [ 25.606684] random: sshd: uninitialized urandom read (32 bytes read) [ 25.763487] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.37' (ECDSA) to the list of known hosts. [ 31.228907] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.321333] WARNING: CPU: 0 PID: 4533 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 31.329718] Kernel panic - not syncing: panic_on_warn set ... [ 31.329718] [ 31.337071] CPU: 0 PID: 4533 Comm: syz-executor636 Not tainted 4.17.0-rc2+ #32 [ 31.344408] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.353736] Call Trace: [ 31.356308] dump_stack+0x1b9/0x294 [ 31.359919] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.365100] ? smc_unhash_sk+0x2f0/0x4a0 [ 31.369145] panic+0x22f/0x4de [ 31.372315] ? add_taint.cold.5+0x16/0x16 [ 31.376446] ? __warn.cold.8+0x148/0x1b3 [ 31.380485] ? __warn.cold.8+0x117/0x1b3 [ 31.384525] ? smc_unhash_sk+0x345/0x4a0 [ 31.388566] __warn.cold.8+0x163/0x1b3 [ 31.392436] ? smc_unhash_sk+0x345/0x4a0 [ 31.396480] report_bug+0x252/0x2d0 [ 31.400089] do_error_trap+0x1de/0x490 [ 31.403955] ? graph_lock+0x170/0x170 [ 31.407735] ? math_error+0x420/0x420 [ 31.411521] ? lock_acquire+0x1dc/0x520 [ 31.415476] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.420299] do_invalid_op+0x1b/0x20 [ 31.423994] invalid_op+0x14/0x20 [ 31.427432] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 31.432075] RSP: 0018:ffff8801d8cef488 EFLAGS: 00010293 [ 31.437417] RAX: ffff8801d91183c0 RBX: ffff8801ad1d17c0 RCX: ffffffff873fce9e [ 31.444666] RDX: 0000000000000000 RSI: ffffffff873fcf55 RDI: 0000000000000005 [ 31.451918] RBP: ffff8801d8cef570 R08: ffff8801d91183c0 R09: ffffed0035a3a308 [ 31.459167] R10: ffffed0035a3a308 R11: ffff8801ad1d1843 R12: 1ffff1003b19de95 [ 31.466416] R13: ffff8801d8cef548 R14: ffffffff8970e060 R15: ffff8801ad1d1840 [ 31.473676] ? smc_unhash_sk+0x28e/0x4a0 [ 31.477715] ? smc_unhash_sk+0x345/0x4a0 [ 31.481779] ? smc_unhash_sk+0x345/0x4a0 [ 31.485821] ? smc_hash_sk+0x2f0/0x2f0 [ 31.489694] ? release_sock+0x1e2/0x2b0 [ 31.493650] ? __local_bh_enable_ip+0x161/0x230 [ 31.498298] ? __release_sock+0x3a0/0x3a0 [ 31.502423] ? smc_release+0x269/0x610 [ 31.506291] ? trace_hardirqs_on+0xd/0x10 [ 31.510420] ? __local_bh_enable_ip+0x161/0x230 [ 31.515068] smc_release+0x36e/0x610 [ 31.518766] sock_release+0x96/0x1b0 [ 31.522461] ? sock_alloc_file+0x4e0/0x4e0 [ 31.526673] sock_close+0x16/0x20 [ 31.530115] __fput+0x34d/0x890 [ 31.533377] ? fput+0x1a0/0x1a0 [ 31.536636] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.541659] ____fput+0x15/0x20 [ 31.544920] task_work_run+0x1e4/0x290 [ 31.548787] ? task_work_cancel+0x240/0x240 [ 31.553093] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.558609] ? switch_task_namespaces+0xa2/0xd0 [ 31.563260] do_exit+0x1aee/0x2730 [ 31.566782] ? mm_update_next_owner+0x980/0x980 [ 31.571429] ? lock_downgrade+0x8e0/0x8e0 [ 31.575554] ? noop_count+0x40/0x40 [ 31.579159] ? lock_pin_lock+0x350/0x350 [ 31.583202] ? kasan_check_read+0x11/0x20 [ 31.587332] ? rcu_is_watching+0x85/0x140 [ 31.591461] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 31.596632] ? is_bpf_text_address+0xd7/0x170 [ 31.601107] ? check_usage_backwards+0x151/0x3a0 [ 31.605841] ? graph_lock+0x170/0x170 [ 31.609621] ? graph_lock+0x170/0x170 [ 31.613407] ? find_held_lock+0x36/0x1c0 [ 31.617461] ? lock_downgrade+0x8e0/0x8e0 [ 31.621589] ? kasan_check_read+0x11/0x20 [ 31.625715] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.630103] ? __local_bh_enable_ip+0x161/0x230 [ 31.634749] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.639748] ? release_sock+0x1e2/0x2b0 [ 31.643702] ? trace_hardirqs_on+0xd/0x10 [ 31.647829] ? __local_bh_enable_ip+0x161/0x230 [ 31.652480] ? _raw_spin_unlock_bh+0x30/0x40 [ 31.656866] ? release_sock+0x1e2/0x2b0 [ 31.660821] ? __release_sock+0x3a0/0x3a0 [ 31.664950] ? __local_bh_enable_ip+0x161/0x230 [ 31.669600] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 31.674770] ? smc_setsockopt+0x1ed/0x630 [ 31.678899] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.684415] ? __sys_setsockopt+0x24f/0x390 [ 31.688719] do_group_exit+0x16f/0x430 [ 31.692585] ? mm_fault_error+0x380/0x380 [ 31.696714] ? __ia32_sys_exit+0x50/0x50 [ 31.700754] ? do_syscall_64+0x92/0x800 [ 31.704711] __x64_sys_exit_group+0x3e/0x50 [ 31.709018] do_syscall_64+0x1b1/0x800 [ 31.712896] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.717806] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.722719] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.728063] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.732887] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.738054] RIP: 0033:0x43e8b8 [ 31.741223] RSP: 002b:00007fff0001e868 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 31.748909] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8b8 [ 31.756157] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 31.763406] RBP: 00000000004be260 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 31.770653] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 31.777899] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 31.785780] Dumping ftrace buffer: [ 31.789407] (ftrace buffer empty) [ 31.793094] Kernel Offset: disabled [ 31.796702] Rebooting in 86400 seconds..