[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.093146] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.475014] random: sshd: uninitialized urandom read (32 bytes read) [ 24.887347] random: sshd: uninitialized urandom read (32 bytes read) [ 25.626980] random: sshd: uninitialized urandom read (32 bytes read) [ 25.781454] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.1' (ECDSA) to the list of known hosts. [ 31.443642] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.534137] WARNING: CPU: 0 PID: 4503 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 31.542525] Kernel panic - not syncing: panic_on_warn set ... [ 31.542525] [ 31.549871] CPU: 0 PID: 4503 Comm: syz-executor892 Not tainted 4.17.0-rc3+ #36 [ 31.557207] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.566539] Call Trace: [ 31.569108] dump_stack+0x1b9/0x294 [ 31.572720] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.577895] ? smc_unhash_sk+0x320/0x4a0 [ 31.581938] panic+0x22f/0x4de [ 31.585112] ? add_taint.cold.5+0x16/0x16 [ 31.589241] ? __warn.cold.8+0x148/0x1b3 [ 31.593279] ? __warn.cold.8+0x117/0x1b3 [ 31.597321] ? smc_unhash_sk+0x345/0x4a0 [ 31.601362] __warn.cold.8+0x163/0x1b3 [ 31.605228] ? smc_unhash_sk+0x345/0x4a0 [ 31.609271] report_bug+0x252/0x2d0 [ 31.612883] do_error_trap+0x1de/0x490 [ 31.616751] ? graph_lock+0x170/0x170 [ 31.620535] ? math_error+0x420/0x420 [ 31.624324] ? lock_acquire+0x1dc/0x520 [ 31.628286] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.633112] do_invalid_op+0x1b/0x20 [ 31.636809] invalid_op+0x14/0x20 [ 31.640246] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 31.644893] RSP: 0018:ffff8801adfdf488 EFLAGS: 00010293 [ 31.650237] RAX: ffff8801ad430080 RBX: ffff8801af5ba7c0 RCX: ffffffff873f756e [ 31.657488] RDX: 0000000000000000 RSI: ffffffff873f7625 RDI: 0000000000000005 [ 31.664736] RBP: ffff8801adfdf570 R08: ffff8801ad430080 R09: ffffed0035eb7508 [ 31.671996] R10: ffffed0035eb7508 R11: ffff8801af5ba843 R12: 1ffff10035bfbe95 [ 31.679251] R13: ffff8801adfdf548 R14: ffffffff8970b1e0 R15: ffff8801af5ba840 [ 31.686512] ? smc_unhash_sk+0x28e/0x4a0 [ 31.690555] ? smc_unhash_sk+0x345/0x4a0 [ 31.694603] ? smc_unhash_sk+0x345/0x4a0 [ 31.698645] ? smc_rx_data_available+0x100/0x100 [ 31.703383] ? release_sock+0x1e2/0x2b0 [ 31.707340] ? __local_bh_enable_ip+0x161/0x230 [ 31.711990] ? __release_sock+0x3a0/0x3a0 [ 31.716121] ? smc_release+0x269/0x610 [ 31.719988] ? trace_hardirqs_on+0xd/0x10 [ 31.724119] ? __local_bh_enable_ip+0x161/0x230 [ 31.728771] smc_release+0x36e/0x610 [ 31.732467] sock_release+0x96/0x1b0 [ 31.736168] ? sock_alloc_file+0x4e0/0x4e0 [ 31.740384] sock_close+0x16/0x20 [ 31.743821] __fput+0x34d/0x890 [ 31.747085] ? fput+0x1a0/0x1a0 [ 31.750345] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.754824] ____fput+0x15/0x20 [ 31.758092] task_work_run+0x1e4/0x290 [ 31.761963] ? task_work_cancel+0x240/0x240 [ 31.766272] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.771796] ? switch_task_namespaces+0xa2/0xd0 [ 31.776449] do_exit+0x1aee/0x2730 [ 31.779975] ? mm_update_next_owner+0x980/0x980 [ 31.784638] ? kasan_check_read+0x11/0x20 [ 31.788767] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.793158] ? __local_bh_enable_ip+0x161/0x230 [ 31.797810] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.802808] ? release_sock+0x1e2/0x2b0 [ 31.806764] ? trace_hardirqs_on+0xd/0x10 [ 31.810892] ? __local_bh_enable_ip+0x161/0x230 [ 31.815542] ? _raw_spin_unlock_bh+0x30/0x40 [ 31.819938] ? kasan_check_read+0x11/0x20 [ 31.824065] ? rcu_is_watching+0x85/0x140 [ 31.828192] ? rcu_pm_notify+0xc0/0xc0 [ 31.832072] ? ___sys_sendmsg+0x31a/0x940 [ 31.836200] ? kfree+0x1e9/0x260 [ 31.839549] ? ___sys_sendmsg+0x31f/0x940 [ 31.843686] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.849202] ? __handle_mm_fault+0x93a/0x4310 [ 31.853680] ? copy_msghdr_from_user+0x560/0x560 [ 31.858419] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 31.863154] ? graph_lock+0x170/0x170 [ 31.866942] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.872460] ? __fget_light+0x2ef/0x430 [ 31.876416] ? fget_raw+0x20/0x20 [ 31.879850] ? find_held_lock+0x36/0x1c0 [ 31.883904] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.889432] ? sockfd_lookup_light+0xc5/0x160 [ 31.893907] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.899422] ? __sys_sendmsg+0x1aa/0x270 [ 31.903463] ? __ia32_sys_shutdown+0x80/0x80 [ 31.907855] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.913373] ? __do_page_fault+0x441/0xe40 [ 31.917600] do_group_exit+0x16f/0x430 [ 31.921471] ? __ia32_sys_exit+0x50/0x50 [ 31.925516] ? do_syscall_64+0x92/0x800 [ 31.929481] __x64_sys_exit_group+0x3e/0x50 [ 31.933786] do_syscall_64+0x1b1/0x800 [ 31.937659] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.942573] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.947485] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.952834] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.957662] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.962831] RIP: 0033:0x43e9f8 [ 31.966001] RSP: 002b:00007ffd0feb6f68 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 31.973698] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e9f8 [ 31.980947] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 31.988194] RBP: 00000000004be3a0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 31.995443] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 32.002690] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 32.010532] Dumping ftrace buffer: [ 32.014171] (ftrace buffer empty) [ 32.017860] Kernel Offset: disabled [ 32.021465] Rebooting in 86400 seconds..