[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.006520] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.559166] random: sshd: uninitialized urandom read (32 bytes read) [ 25.733653] random: sshd: uninitialized urandom read (32 bytes read) [ 26.565445] random: sshd: uninitialized urandom read (32 bytes read) [ 59.075013] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.56' (ECDSA) to the list of known hosts. [ 64.656301] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 64.766536] WARNING: CPU: 1 PID: 4533 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 64.775014] Kernel panic - not syncing: panic_on_warn set ... [ 64.775014] [ 64.782384] CPU: 1 PID: 4533 Comm: syz-executor144 Not tainted 4.17.0-rc2+ #30 [ 64.789732] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.799089] Call Trace: [ 64.801694] dump_stack+0x1b9/0x294 [ 64.805318] ? dump_stack_print_info.cold.2+0x52/0x52 [ 64.810509] ? smc_unhash_sk+0x2e0/0x4a0 [ 64.814562] panic+0x22f/0x4de [ 64.817745] ? add_taint.cold.5+0x16/0x16 [ 64.821889] ? __warn.cold.8+0x148/0x1b3 [ 64.825955] ? __warn.cold.8+0x117/0x1b3 [ 64.830007] ? smc_unhash_sk+0x345/0x4a0 [ 64.834327] __warn.cold.8+0x163/0x1b3 [ 64.838206] ? smc_unhash_sk+0x345/0x4a0 [ 64.842318] report_bug+0x252/0x2d0 [ 64.845981] do_error_trap+0x1de/0x490 [ 64.849863] ? graph_lock+0x170/0x170 [ 64.853655] ? math_error+0x420/0x420 [ 64.857450] ? lock_acquire+0x1dc/0x520 [ 64.861418] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 64.866254] do_invalid_op+0x1b/0x20 [ 64.869964] invalid_op+0x14/0x20 [ 64.873430] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 64.878083] RSP: 0018:ffff8801b8de7488 EFLAGS: 00010293 [ 64.883428] RAX: ffff8801d0072440 RBX: ffff8801b268a7c0 RCX: ffffffff873fc8ae [ 64.890678] RDX: 0000000000000000 RSI: ffffffff873fc965 RDI: 0000000000000005 [ 64.897929] RBP: ffff8801b8de7570 R08: ffff8801d0072440 R09: ffffed00364d1508 [ 64.905179] R10: ffffed00364d1508 R11: ffff8801b268a843 R12: 1ffff100371bce95 [ 64.912429] R13: ffff8801b8de7548 R14: ffffffff8970e060 R15: ffff8801b268a840 [ 64.919689] ? smc_unhash_sk+0x28e/0x4a0 [ 64.923737] ? smc_unhash_sk+0x345/0x4a0 [ 64.927781] ? smc_unhash_sk+0x345/0x4a0 [ 64.931821] ? smc_hash_sk+0x2f0/0x2f0 [ 64.935691] ? release_sock+0x1e2/0x2b0 [ 64.939652] ? __local_bh_enable_ip+0x161/0x230 [ 64.944308] ? __release_sock+0x3a0/0x3a0 [ 64.948436] ? smc_release+0x269/0x610 [ 64.952306] ? trace_hardirqs_on+0xd/0x10 [ 64.956432] ? __local_bh_enable_ip+0x161/0x230 [ 64.961083] smc_release+0x36e/0x610 [ 64.964782] sock_release+0x96/0x1b0 [ 64.968475] ? sock_alloc_file+0x4e0/0x4e0 [ 64.972698] sock_close+0x16/0x20 [ 64.976131] __fput+0x34d/0x890 [ 64.979392] ? fput+0x1a0/0x1a0 [ 64.982654] ? _raw_spin_unlock_irq+0x27/0x70 [ 64.987129] ____fput+0x15/0x20 [ 64.990398] task_work_run+0x1e4/0x290 [ 64.994269] ? task_work_cancel+0x240/0x240 [ 64.998579] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 65.004097] ? switch_task_namespaces+0xa2/0xd0 [ 65.008750] do_exit+0x1aee/0x2730 [ 65.012271] ? _raw_spin_unlock_bh+0x30/0x40 [ 65.016661] ? mm_update_next_owner+0x980/0x980 [ 65.021314] ? ___sys_sendmsg+0x31a/0x940 [ 65.025440] ? rcu_read_lock_sched_held+0x108/0x120 [ 65.030435] ? kfree+0x1e9/0x260 [ 65.033779] ? ___sys_sendmsg+0x31f/0x940 [ 65.037906] ? copy_msghdr_from_user+0x560/0x560 [ 65.042641] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 65.047635] ? graph_lock+0x170/0x170 [ 65.051414] ? pud_val+0x80/0xf0 [ 65.054768] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 65.060287] ? __fget_light+0x2ef/0x430 [ 65.064242] ? __handle_mm_fault+0x93a/0x4310 [ 65.068721] ? fget_raw+0x20/0x20 [ 65.072163] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 65.076897] ? graph_lock+0x170/0x170 [ 65.080687] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 65.086204] ? sockfd_lookup_light+0xc5/0x160 [ 65.090681] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 65.096210] ? __sys_sendmmsg+0x4b3/0x6f0 [ 65.100349] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 65.104653] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 65.110180] ? __handle_mm_fault+0x4310/0x4310 [ 65.114748] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 65.120267] ? __do_page_fault+0x441/0xe40 [ 65.124502] do_group_exit+0x16f/0x430 [ 65.128393] ? mm_fault_error+0x380/0x380 [ 65.132551] ? __ia32_sys_exit+0x50/0x50 [ 65.136627] ? do_syscall_64+0x92/0x800 [ 65.140599] __x64_sys_exit_group+0x3e/0x50 [ 65.144903] do_syscall_64+0x1b1/0x800 [ 65.148772] ? syscall_return_slowpath+0x5c0/0x5c0 [ 65.153693] ? syscall_return_slowpath+0x30f/0x5c0 [ 65.158606] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 65.163961] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 65.168786] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 65.173955] RIP: 0033:0x43ea88 [ 65.177121] RSP: 002b:00007fffab31f338 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 65.184811] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ea88 [ 65.192062] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 65.199314] RBP: 00000000004be420 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 65.206564] R10: 000000002004c080 R11: 0000000000000246 R12: 0000000000000001 [ 65.213822] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 65.221691] Dumping ftrace buffer: [ 65.225331] (ftrace buffer empty) [ 65.229028] Kernel Offset: disabled [ 65.232634] Rebooting in 86400 seconds..