[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.624933] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.917691] random: sshd: uninitialized urandom read (32 bytes read) [ 25.393651] random: sshd: uninitialized urandom read (32 bytes read) [ 26.178244] random: sshd: uninitialized urandom read (32 bytes read) [ 26.334279] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.14' (ECDSA) to the list of known hosts. [ 31.792799] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.896895] WARNING: CPU: 0 PID: 4508 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 31.905291] Kernel panic - not syncing: panic_on_warn set ... [ 31.905291] [ 31.912643] CPU: 0 PID: 4508 Comm: syz-executor791 Not tainted 4.17.0-rc3+ #36 [ 31.919991] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.929331] Call Trace: [ 31.931915] dump_stack+0x1b9/0x294 [ 31.935526] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.940712] ? smc_unhash_sk+0x320/0x4a0 [ 31.944756] panic+0x22f/0x4de [ 31.947946] ? add_taint.cold.5+0x16/0x16 [ 31.952082] ? __warn.cold.8+0x148/0x1b3 [ 31.956131] ? __warn.cold.8+0x117/0x1b3 [ 31.960171] ? smc_unhash_sk+0x345/0x4a0 [ 31.964209] __warn.cold.8+0x163/0x1b3 [ 31.968080] ? smc_unhash_sk+0x345/0x4a0 [ 31.972124] report_bug+0x252/0x2d0 [ 31.975742] do_error_trap+0x1de/0x490 [ 31.979869] ? graph_lock+0x170/0x170 [ 31.983662] ? math_error+0x420/0x420 [ 31.987553] ? lock_acquire+0x1dc/0x520 [ 31.991525] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.996350] do_invalid_op+0x1b/0x20 [ 32.000049] invalid_op+0x14/0x20 [ 32.003487] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 32.008130] RSP: 0018:ffff8801ac54f488 EFLAGS: 00010293 [ 32.013475] RAX: ffff8801d94f8400 RBX: ffff8801ac4667c0 RCX: ffffffff873f756e [ 32.020734] RDX: 0000000000000000 RSI: ffffffff873f7625 RDI: 0000000000000005 [ 32.027984] RBP: ffff8801ac54f570 R08: ffff8801d94f8400 R09: ffffed003588cd08 [ 32.035242] R10: ffffed003588cd08 R11: ffff8801ac466843 R12: 1ffff100358a9e95 [ 32.042493] R13: ffff8801ac54f548 R14: ffffffff8970b1e0 R15: ffff8801ac466840 [ 32.049755] ? smc_unhash_sk+0x28e/0x4a0 [ 32.053796] ? smc_unhash_sk+0x345/0x4a0 [ 32.057839] ? smc_unhash_sk+0x345/0x4a0 [ 32.061880] ? smc_rx_data_available+0x100/0x100 [ 32.066617] ? release_sock+0x1e2/0x2b0 [ 32.070588] ? __local_bh_enable_ip+0x161/0x230 [ 32.075252] ? __release_sock+0x3a0/0x3a0 [ 32.079382] ? smc_release+0x269/0x610 [ 32.083248] ? trace_hardirqs_on+0xd/0x10 [ 32.087377] ? __local_bh_enable_ip+0x161/0x230 [ 32.092045] smc_release+0x36e/0x610 [ 32.095745] sock_release+0x96/0x1b0 [ 32.099448] ? sock_alloc_file+0x4e0/0x4e0 [ 32.103670] sock_close+0x16/0x20 [ 32.107105] __fput+0x34d/0x890 [ 32.110368] ? fput+0x1a0/0x1a0 [ 32.113628] ? _raw_spin_unlock_irq+0x27/0x70 [ 32.118115] ____fput+0x15/0x20 [ 32.121374] task_work_run+0x1e4/0x290 [ 32.125248] ? task_work_cancel+0x240/0x240 [ 32.129550] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 32.135072] ? switch_task_namespaces+0xa2/0xd0 [ 32.139724] do_exit+0x1aee/0x2730 [ 32.143248] ? mm_update_next_owner+0x980/0x980 [ 32.147904] ? ___sys_sendmsg+0x31a/0x940 [ 32.152047] ? rcu_read_lock_sched_held+0x108/0x120 [ 32.157048] ? kfree+0x1e9/0x260 [ 32.160406] ? ___sys_sendmsg+0x31f/0x940 [ 32.164536] ? copy_msghdr_from_user+0x560/0x560 [ 32.169281] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.174301] ? graph_lock+0x170/0x170 [ 32.178083] ? pud_val+0x80/0xf0 [ 32.181443] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.186966] ? __fget_light+0x2ef/0x430 [ 32.190925] ? __handle_mm_fault+0x93a/0x4310 [ 32.195403] ? fget_raw+0x20/0x20 [ 32.198840] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 32.203576] ? graph_lock+0x170/0x170 [ 32.207356] ? graph_lock+0x170/0x170 [ 32.211137] ? find_held_lock+0x36/0x1c0 [ 32.215196] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.220728] ? sockfd_lookup_light+0xc5/0x160 [ 32.225226] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.230743] ? __sys_sendmmsg+0x4b3/0x6f0 [ 32.234874] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 32.239192] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 32.244741] ? __handle_mm_fault+0x4310/0x4310 [ 32.249310] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.254842] ? __do_page_fault+0x441/0xe40 [ 32.259073] do_group_exit+0x16f/0x430 [ 32.263220] ? mm_fault_error+0x380/0x380 [ 32.267443] ? __ia32_sys_exit+0x50/0x50 [ 32.271491] ? do_syscall_64+0x92/0x800 [ 32.275453] __x64_sys_exit_group+0x3e/0x50 [ 32.279760] do_syscall_64+0x1b1/0x800 [ 32.283630] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 32.288457] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.293374] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.298298] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 32.303656] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.308482] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.313662] RIP: 0033:0x43ed18 [ 32.316837] RSP: 002b:00007ffc823e1648 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 32.324529] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ed18 [ 32.331782] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 32.339040] RBP: 00000000004be6c0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 32.346314] R10: 0000000020000800 R11: 0000000000000246 R12: 0000000000000001 [ 32.353564] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 32.361471] Dumping ftrace buffer: [ 32.365146] (ftrace buffer empty) [ 32.368840] Kernel Offset: disabled [ 32.372449] Rebooting in 86400 seconds..