[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.177012] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.974356] random: sshd: uninitialized urandom read (32 bytes read) [ 24.493157] random: sshd: uninitialized urandom read (32 bytes read) [ 25.218507] random: sshd: uninitialized urandom read (32 bytes read) [ 25.374799] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.8' (ECDSA) to the list of known hosts. [ 30.923585] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.014920] WARNING: CPU: 0 PID: 4527 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 31.023312] Kernel panic - not syncing: panic_on_warn set ... [ 31.023312] [ 31.030659] CPU: 0 PID: 4527 Comm: syz-executor439 Not tainted 4.17.0-rc6+ #57 [ 31.037993] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.047332] Call Trace: [ 31.049907] dump_stack+0x1b9/0x294 [ 31.053518] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.058694] ? smc_unhash_sk+0x280/0x4a0 [ 31.062737] panic+0x22f/0x4de [ 31.065909] ? add_taint.cold.5+0x16/0x16 [ 31.070052] ? __warn.cold.8+0x148/0x1b3 [ 31.074103] ? __warn.cold.8+0x117/0x1b3 [ 31.078147] ? smc_unhash_sk+0x345/0x4a0 [ 31.082188] __warn.cold.8+0x163/0x1b3 [ 31.086057] ? smc_unhash_sk+0x345/0x4a0 [ 31.090106] report_bug+0x252/0x2d0 [ 31.093718] do_error_trap+0x1de/0x490 [ 31.097589] ? graph_lock+0x170/0x170 [ 31.101373] ? math_error+0x420/0x420 [ 31.105158] ? lock_acquire+0x1dc/0x520 [ 31.109116] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.113941] do_invalid_op+0x1b/0x20 [ 31.117636] invalid_op+0x14/0x20 [ 31.121074] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 31.125720] RSP: 0018:ffff8801b2a67488 EFLAGS: 00010293 [ 31.131060] RAX: ffff8801d8eea300 RBX: ffff8801d8d9d7c0 RCX: ffffffff87414a0e [ 31.138307] RDX: 0000000000000000 RSI: ffffffff87414ac5 RDI: 0000000000000005 [ 31.145556] RBP: ffff8801b2a67570 R08: ffff8801d8eea300 R09: ffffed003b1b3b08 [ 31.152812] R10: ffffed003b1b3b08 R11: ffff8801d8d9d843 R12: 1ffff1003654ce95 [ 31.160069] R13: ffff8801b2a67548 R14: ffffffff8970d9e0 R15: ffff8801d8d9d840 [ 31.167351] ? smc_unhash_sk+0x28e/0x4a0 [ 31.171604] ? smc_unhash_sk+0x345/0x4a0 [ 31.175651] ? smc_unhash_sk+0x345/0x4a0 [ 31.179711] ? smc_rx_data_available+0x100/0x100 [ 31.184450] ? release_sock+0x1e2/0x2b0 [ 31.188407] ? __local_bh_enable_ip+0x161/0x230 [ 31.193061] ? __release_sock+0x3a0/0x3a0 [ 31.197190] ? smc_release+0x269/0x610 [ 31.201061] ? trace_hardirqs_on+0xd/0x10 [ 31.205276] ? __local_bh_enable_ip+0x161/0x230 [ 31.209934] smc_release+0x36e/0x610 [ 31.213630] sock_release+0x96/0x1b0 [ 31.217330] ? sock_alloc_file+0x4e0/0x4e0 [ 31.221547] sock_close+0x16/0x20 [ 31.224989] __fput+0x34d/0x890 [ 31.228252] ? fput+0x1a0/0x1a0 [ 31.231514] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.235989] ____fput+0x15/0x20 [ 31.239253] task_work_run+0x1e4/0x290 [ 31.243122] ? task_work_cancel+0x240/0x240 [ 31.247427] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.252956] ? switch_task_namespaces+0xa2/0xd0 [ 31.257619] do_exit+0x1aee/0x2730 [ 31.261145] ? mm_update_next_owner+0x980/0x980 [ 31.265794] ? kasan_check_read+0x11/0x20 [ 31.269922] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.274313] ? __local_bh_enable_ip+0x161/0x230 [ 31.278964] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.283962] ? release_sock+0x1e2/0x2b0 [ 31.287916] ? trace_hardirqs_on+0xd/0x10 [ 31.292052] ? __local_bh_enable_ip+0x161/0x230 [ 31.296712] ? _raw_spin_unlock_bh+0x30/0x40 [ 31.301107] ? kasan_check_read+0x11/0x20 [ 31.305236] ? rcu_is_watching+0x85/0x140 [ 31.309366] ? rcu_pm_notify+0xc0/0xc0 [ 31.313241] ? ___sys_sendmsg+0x31a/0x940 [ 31.317370] ? kfree+0x1e9/0x260 [ 31.320716] ? ___sys_sendmsg+0x31f/0x940 [ 31.324845] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.330362] ? copy_msghdr_from_user+0x560/0x560 [ 31.335099] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 31.339830] ? graph_lock+0x170/0x170 [ 31.343615] ? find_held_lock+0x36/0x1c0 [ 31.347663] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.353181] ? __fget_light+0x2ef/0x430 [ 31.357138] ? find_held_lock+0x36/0x1c0 [ 31.361191] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.366710] ? sockfd_lookup_light+0xc5/0x160 [ 31.371188] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.376713] ? __sys_sendmsg+0x1aa/0x270 [ 31.380755] ? __ia32_sys_shutdown+0x80/0x80 [ 31.385149] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.390670] ? __do_page_fault+0x441/0xe40 [ 31.394899] do_group_exit+0x16f/0x430 [ 31.398770] ? __ia32_sys_exit+0x50/0x50 [ 31.402814] ? do_syscall_64+0x92/0x800 [ 31.406770] __x64_sys_exit_group+0x3e/0x50 [ 31.411075] do_syscall_64+0x1b1/0x800 [ 31.414957] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.419877] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.424802] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.430151] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.434980] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.440147] RIP: 0033:0x43ea58 [ 31.443337] RSP: 002b:00007ffde7680418 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 31.451032] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ea58 [ 31.458370] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 31.465617] RBP: 00000000004be460 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 31.472864] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 31.480111] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 31.487937] Dumping ftrace buffer: [ 31.491555] (ftrace buffer empty) [ 31.495244] Kernel Offset: disabled [ 31.498862] Rebooting in 86400 seconds..