[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.473662] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.195294] random: sshd: uninitialized urandom read (32 bytes read) [ 24.673603] random: sshd: uninitialized urandom read (32 bytes read) [ 25.425832] random: sshd: uninitialized urandom read (32 bytes read) [ 25.580535] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.47' (ECDSA) to the list of known hosts. [ 31.043590] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.133792] WARNING: CPU: 0 PID: 4507 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 31.142170] Kernel panic - not syncing: panic_on_warn set ... [ 31.142170] [ 31.149515] CPU: 0 PID: 4507 Comm: syz-executor827 Not tainted 4.17.0-rc6+ #62 [ 31.156849] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.166179] Call Trace: [ 31.168753] dump_stack+0x1b9/0x294 [ 31.172360] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.177530] ? smc_unhash_sk+0x290/0x4a0 [ 31.181571] panic+0x22f/0x4de [ 31.184741] ? add_taint.cold.5+0x16/0x16 [ 31.188870] ? __warn.cold.8+0x148/0x1b3 [ 31.192909] ? __warn.cold.8+0x117/0x1b3 [ 31.196953] ? smc_unhash_sk+0x345/0x4a0 [ 31.200993] __warn.cold.8+0x163/0x1b3 [ 31.204864] ? smc_unhash_sk+0x345/0x4a0 [ 31.208905] report_bug+0x252/0x2d0 [ 31.212514] do_error_trap+0x1de/0x490 [ 31.216378] ? graph_lock+0x170/0x170 [ 31.220159] ? math_error+0x420/0x420 [ 31.223950] ? lock_acquire+0x1dc/0x520 [ 31.227907] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.232729] do_invalid_op+0x1b/0x20 [ 31.236421] invalid_op+0x14/0x20 [ 31.239853] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 31.244495] RSP: 0018:ffff8801aeba7488 EFLAGS: 00010293 [ 31.249835] RAX: ffff8801ade26640 RBX: ffff8801adb437c0 RCX: ffffffff87427cfe [ 31.257086] RDX: 0000000000000000 RSI: ffffffff87427db5 RDI: 0000000000000005 [ 31.264334] RBP: ffff8801aeba7570 R08: ffff8801ade26640 R09: ffffed0035b68708 [ 31.271581] R10: ffffed0035b68708 R11: ffff8801adb43843 R12: 1ffff10035d74e95 [ 31.278831] R13: ffff8801aeba7548 R14: ffffffff8970ea20 R15: ffff8801adb43840 [ 31.286092] ? smc_unhash_sk+0x28e/0x4a0 [ 31.290132] ? smc_unhash_sk+0x345/0x4a0 [ 31.294176] ? smc_unhash_sk+0x345/0x4a0 [ 31.298217] ? smc_rx_data_available+0x100/0x100 [ 31.302951] ? release_sock+0x1e2/0x2b0 [ 31.306905] ? __local_bh_enable_ip+0x161/0x230 [ 31.311554] ? __release_sock+0x3a0/0x3a0 [ 31.315681] ? smc_release+0x269/0x610 [ 31.319545] ? trace_hardirqs_on+0xd/0x10 [ 31.323672] ? __local_bh_enable_ip+0x161/0x230 [ 31.328321] smc_release+0x36e/0x610 [ 31.332022] sock_release+0x96/0x1b0 [ 31.335722] ? sock_alloc_file+0x4e0/0x4e0 [ 31.339938] sock_close+0x16/0x20 [ 31.343372] __fput+0x34d/0x890 [ 31.346631] ? fput+0x1a0/0x1a0 [ 31.349893] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.354367] ____fput+0x15/0x20 [ 31.357626] task_work_run+0x1e4/0x290 [ 31.361492] ? task_work_cancel+0x240/0x240 [ 31.365793] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.371307] ? switch_task_namespaces+0xa2/0xd0 [ 31.375955] do_exit+0x1aee/0x2730 [ 31.379477] ? mm_update_next_owner+0x980/0x980 [ 31.384125] ? kasan_check_read+0x11/0x20 [ 31.388252] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.392638] ? __local_bh_enable_ip+0x161/0x230 [ 31.397286] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.402281] ? release_sock+0x1e2/0x2b0 [ 31.406235] ? trace_hardirqs_on+0xd/0x10 [ 31.410359] ? __local_bh_enable_ip+0x161/0x230 [ 31.415012] ? _raw_spin_unlock_bh+0x30/0x40 [ 31.419410] ? kasan_check_read+0x11/0x20 [ 31.423548] ? rcu_is_watching+0x85/0x140 [ 31.427676] ? rcu_pm_notify+0xc0/0xc0 [ 31.431545] ? ___sys_sendmsg+0x31a/0x940 [ 31.435671] ? kfree+0x1e9/0x260 [ 31.439025] ? ___sys_sendmsg+0x31f/0x940 [ 31.443163] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.448678] ? __handle_mm_fault+0x93a/0x4310 [ 31.453152] ? copy_msghdr_from_user+0x560/0x560 [ 31.457886] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 31.463158] ? graph_lock+0x170/0x170 [ 31.466947] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.472462] ? __fget_light+0x2ef/0x430 [ 31.476414] ? fget_raw+0x20/0x20 [ 31.479843] ? find_held_lock+0x36/0x1c0 [ 31.483907] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.489430] ? sockfd_lookup_light+0xc5/0x160 [ 31.493903] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.499418] ? __sys_sendmsg+0x1aa/0x270 [ 31.503460] ? __ia32_sys_shutdown+0x80/0x80 [ 31.507847] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.513363] ? __do_page_fault+0x441/0xe40 [ 31.517581] do_group_exit+0x16f/0x430 [ 31.521449] ? __ia32_sys_exit+0x50/0x50 [ 31.525492] ? do_syscall_64+0x92/0x800 [ 31.529446] __x64_sys_exit_group+0x3e/0x50 [ 31.533747] do_syscall_64+0x1b1/0x800 [ 31.537613] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 31.542435] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.547356] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.552271] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.557616] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.562441] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.567607] RIP: 0033:0x43e9a8 [ 31.570773] RSP: 002b:00007ffd66014b78 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 31.578459] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e9a8 [ 31.585705] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 31.592952] RBP: 00000000004be340 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 31.600209] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 31.607456] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 31.615291] Dumping ftrace buffer: [ 31.618908] (ftrace buffer empty) [ 31.622594] Kernel Offset: disabled [ 31.626198] Rebooting in 86400 seconds..