[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.727421] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.586265] random: sshd: uninitialized urandom read (32 bytes read) [ 22.854290] random: sshd: uninitialized urandom read (32 bytes read) [ 23.538134] random: sshd: uninitialized urandom read (32 bytes read) [ 47.801293] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.45' (ECDSA) to the list of known hosts. [ 53.323713] random: sshd: uninitialized urandom read (32 bytes read) 2018/04/24 23:43:32 parsed 1 programs 2018/04/24 23:43:32 executed programs: 0 [ 53.829349] IPVS: ftp: loaded support on port[0] = 21 [ 53.876989] WARNING: CPU: 1 PID: 4510 at include/net/sock.h:639 smc_unhash_sk+0x345/0x4a0 [ 53.885403] Kernel panic - not syncing: panic_on_warn set ... [ 53.885403] [ 53.892759] CPU: 1 PID: 4510 Comm: syz-executor0 Not tainted 4.17.0-rc2+ #15 [ 53.899926] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.909271] Call Trace: [ 53.911866] dump_stack+0x1b9/0x294 [ 53.915479] ? dump_stack_print_info.cold.2+0x52/0x52 [ 53.920666] ? smc_unhash_sk+0x250/0x4a0 [ 53.924717] panic+0x22f/0x4de [ 53.927900] ? add_taint.cold.5+0x16/0x16 [ 53.932046] ? __warn.cold.8+0x148/0x1b3 [ 53.936103] ? __warn.cold.8+0x117/0x1b3 [ 53.940171] ? smc_unhash_sk+0x345/0x4a0 [ 53.944229] __warn.cold.8+0x163/0x1b3 [ 53.948101] ? smc_unhash_sk+0x345/0x4a0 [ 53.952152] report_bug+0x252/0x2d0 [ 53.955773] do_error_trap+0x1de/0x490 [ 53.959647] ? math_error+0x420/0x420 [ 53.963440] ? lock_acquire+0x1dc/0x520 [ 53.967416] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 53.972249] do_invalid_op+0x1b/0x20 [ 53.975969] invalid_op+0x14/0x20 [ 53.979602] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 53.984272] RSP: 0018:ffff8801b23bf030 EFLAGS: 00010293 [ 53.989632] RAX: ffff8801b29da640 RBX: ffff8801b31cd7c0 RCX: ffffffff873e793e [ 53.996892] RDX: 0000000000000000 RSI: ffffffff873e79f5 RDI: 0000000000000005 [ 54.004158] RBP: ffff8801b23bf118 R08: ffff8801b29da640 R09: ffffed0036639b08 [ 54.011417] R10: ffffed0036639b08 R11: ffff8801b31cd843 R12: 1ffff10036477e0a [ 54.018696] R13: ffff8801b23bf0f0 R14: ffffffff8970b180 R15: ffff8801b31cd840 [ 54.025967] ? smc_unhash_sk+0x28e/0x4a0 [ 54.030022] ? smc_unhash_sk+0x345/0x4a0 [ 54.034092] ? smc_hash_sk+0x2f0/0x2f0 [ 54.037970] ? release_sock+0x1e2/0x2b0 [ 54.041942] ? __local_bh_enable_ip+0x161/0x230 [ 54.046615] ? __release_sock+0x3a0/0x3a0 [ 54.050753] ? smc_release+0x269/0x610 [ 54.054628] ? trace_hardirqs_on+0xd/0x10 [ 54.058759] ? __local_bh_enable_ip+0x161/0x230 [ 54.063428] smc_release+0x36e/0x610 [ 54.067130] sock_release+0x96/0x1b0 [ 54.070846] ? sock_alloc_file+0x4e0/0x4e0 [ 54.075080] sock_close+0x16/0x20 [ 54.078523] __fput+0x34d/0x890 [ 54.081800] ? fput+0x1a0/0x1a0 [ 54.085067] ? _raw_spin_unlock_irq+0x27/0x70 [ 54.089551] ____fput+0x15/0x20 [ 54.092815] task_work_run+0x1e4/0x290 [ 54.096693] ? task_work_cancel+0x240/0x240 [ 54.101004] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 54.106536] ? switch_task_namespaces+0xa2/0xd0 [ 54.111196] do_exit+0x1aee/0x2730 [ 54.114726] ? mm_update_next_owner+0x980/0x980 [ 54.119393] ? print_usage_bug+0xc0/0xc0 [ 54.123445] ? lock_downgrade+0x8e0/0x8e0 [ 54.127589] ? lock_downgrade+0x8e0/0x8e0 [ 54.131742] ? kasan_check_read+0x11/0x20 [ 54.135875] ? do_raw_spin_unlock+0x9e/0x2e0 [ 54.140270] ? __lock_acquire+0x7f5/0x5140 [ 54.144498] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 54.149241] ? _raw_spin_unlock_bh+0x30/0x40 [ 54.153643] ? debug_check_no_locks_freed+0x310/0x310 [ 54.158838] ? smc_poll+0x294/0xcf0 [ 54.162460] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 54.167994] ? __fget_light+0x2ef/0x430 [ 54.171958] ? fget_raw+0x20/0x20 [ 54.175415] ? __check_object_size+0x95/0x5d9 [ 54.179902] ? graph_lock+0x170/0x170 [ 54.183708] ? sock_poll+0x2be/0x390 [ 54.187407] ? sock_ioctl+0x680/0x680 [ 54.191215] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 54.196758] ? memset+0x31/0x40 [ 54.200026] ? find_held_lock+0x36/0x1c0 [ 54.204074] ? lock_downgrade+0x8e0/0x8e0 [ 54.208213] do_group_exit+0x16f/0x430 [ 54.212105] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 54.216678] ? __ia32_sys_exit+0x50/0x50 [ 54.220737] ? _raw_spin_unlock_irq+0x27/0x70 [ 54.225222] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 54.230229] get_signal+0x886/0x1960 [ 54.233934] ? ptrace_notify+0x130/0x130 [ 54.237995] ? lock_downgrade+0x8e0/0x8e0 [ 54.242162] ? lock_downgrade+0x8e0/0x8e0 [ 54.246313] ? kasan_check_read+0x11/0x20 [ 54.250459] ? release_sock+0x1e2/0x2b0 [ 54.254431] ? trace_hardirqs_on+0xd/0x10 [ 54.258591] ? __local_bh_enable_ip+0x161/0x230 [ 54.263277] do_signal+0x98/0x2040 [ 54.266827] ? __release_sock+0x3a0/0x3a0 [ 54.270982] ? setup_sigcontext+0x7d0/0x7d0 [ 54.275298] ? smc_connect+0xaf/0x260 [ 54.279092] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 54.284636] ? __sys_connect+0x1d1/0x4c0 [ 54.288686] ? __ia32_sys_accept+0xb0/0xb0 [ 54.292913] ? exit_to_usermode_loop+0x87/0x310 [ 54.297580] exit_to_usermode_loop+0x28a/0x310 [ 54.302151] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 54.306979] ? do_syscall_64+0x92/0x800 [ 54.310950] do_syscall_64+0x6ac/0x800 [ 54.314836] ? syscall_return_slowpath+0x5c0/0x5c0 [ 54.319765] ? syscall_return_slowpath+0x30f/0x5c0 [ 54.324692] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 54.330046] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 54.334888] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 54.340062] RIP: 0033:0x455389 [ 54.343235] RSP: 002b:00007ffdb9973188 EFLAGS: 00000246 ORIG_RAX: 0000000000000007 [ 54.350930] RAX: 0000000000000001 RBX: 0000000001565914 RCX: 0000000000455389 [ 54.358184] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000020000100 [ 54.365439] RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 [ 54.372693] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 54.379947] R13: 000000000000046b R14: 00000000006f9aa8 R15: 000000000000d591 [ 54.388069] Dumping ftrace buffer: [ 54.391859] (ftrace buffer empty) [ 54.395576] Kernel Offset: disabled [ 54.399204] Rebooting in 86400 seconds..