[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.718533] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.445295] random: sshd: uninitialized urandom read (32 bytes read) [ 22.703858] random: sshd: uninitialized urandom read (32 bytes read) [ 23.450073] random: sshd: uninitialized urandom read (32 bytes read) [ 23.609209] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.19' (ECDSA) to the list of known hosts. [ 29.027479] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.117778] WARNING: CPU: 0 PID: 4495 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 29.126152] Kernel panic - not syncing: panic_on_warn set ... [ 29.126152] [ 29.133505] CPU: 0 PID: 4495 Comm: syz-executor097 Not tainted 4.17.0-rc4+ #52 [ 29.140838] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.150169] Call Trace: [ 29.152736] dump_stack+0x1b9/0x294 [ 29.156344] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.161517] ? smc_unhash_sk+0x2f0/0x4a0 [ 29.165558] panic+0x22f/0x4de [ 29.168730] ? add_taint.cold.5+0x16/0x16 [ 29.172857] ? __warn.cold.8+0x148/0x1b3 [ 29.176894] ? __warn.cold.8+0x117/0x1b3 [ 29.180938] ? smc_unhash_sk+0x345/0x4a0 [ 29.184978] __warn.cold.8+0x163/0x1b3 [ 29.188843] ? smc_unhash_sk+0x345/0x4a0 [ 29.192882] report_bug+0x252/0x2d0 [ 29.196487] do_error_trap+0x1de/0x490 [ 29.200352] ? graph_lock+0x170/0x170 [ 29.204132] ? math_error+0x420/0x420 [ 29.207913] ? lock_acquire+0x1dc/0x520 [ 29.211870] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.216692] do_invalid_op+0x1b/0x20 [ 29.220386] invalid_op+0x14/0x20 [ 29.223817] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 29.228457] RSP: 0018:ffff8801acbdf488 EFLAGS: 00010293 [ 29.233799] RAX: ffff8801ac4cc1c0 RBX: ffff8801d95207c0 RCX: ffffffff8740fa9e [ 29.241047] RDX: 0000000000000000 RSI: ffffffff8740fb55 RDI: 0000000000000005 [ 29.248293] RBP: ffff8801acbdf570 R08: ffff8801ac4cc1c0 R09: ffffed003b2a4108 [ 29.255538] R10: ffffed003b2a4108 R11: ffff8801d9520843 R12: 1ffff1003597be95 [ 29.262785] R13: ffff8801acbdf548 R14: ffffffff8970dc60 R15: ffff8801d9520840 [ 29.270039] ? smc_unhash_sk+0x28e/0x4a0 [ 29.274078] ? smc_unhash_sk+0x345/0x4a0 [ 29.278120] ? smc_unhash_sk+0x345/0x4a0 [ 29.282161] ? smc_rx_data_available+0x100/0x100 [ 29.286893] ? release_sock+0x1e2/0x2b0 [ 29.290856] ? __local_bh_enable_ip+0x161/0x230 [ 29.295503] ? __release_sock+0x3a0/0x3a0 [ 29.299629] ? smc_release+0x269/0x610 [ 29.303494] ? trace_hardirqs_on+0xd/0x10 [ 29.307621] ? __local_bh_enable_ip+0x161/0x230 [ 29.312267] smc_release+0x36e/0x610 [ 29.315961] sock_release+0x96/0x1b0 [ 29.319653] ? sock_alloc_file+0x4e0/0x4e0 [ 29.323870] sock_close+0x16/0x20 [ 29.327303] __fput+0x34d/0x890 [ 29.330563] ? fput+0x1a0/0x1a0 [ 29.333821] ? _raw_spin_unlock_irq+0x27/0x70 [ 29.338294] ____fput+0x15/0x20 [ 29.341552] task_work_run+0x1e4/0x290 [ 29.345418] ? task_work_cancel+0x240/0x240 [ 29.349719] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 29.355233] ? switch_task_namespaces+0xa2/0xd0 [ 29.359882] do_exit+0x1aee/0x2730 [ 29.363402] ? mm_update_next_owner+0x980/0x980 [ 29.368058] ? lock_downgrade+0x8e0/0x8e0 [ 29.372188] ? noop_count+0x40/0x40 [ 29.375790] ? lock_pin_lock+0x350/0x350 [ 29.379832] ? kasan_check_read+0x11/0x20 [ 29.383961] ? rcu_is_watching+0x85/0x140 [ 29.388088] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 29.393261] ? is_bpf_text_address+0xd7/0x170 [ 29.397737] ? check_usage_backwards+0x151/0x3a0 [ 29.402472] ? graph_lock+0x170/0x170 [ 29.406249] ? graph_lock+0x170/0x170 [ 29.410034] ? find_held_lock+0x36/0x1c0 [ 29.414086] ? lock_downgrade+0x8e0/0x8e0 [ 29.418215] ? kasan_check_read+0x11/0x20 [ 29.422339] ? do_raw_spin_unlock+0x9e/0x2e0 [ 29.426726] ? __local_bh_enable_ip+0x161/0x230 [ 29.431374] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.436369] ? release_sock+0x1e2/0x2b0 [ 29.440319] ? trace_hardirqs_on+0xd/0x10 [ 29.444446] ? __local_bh_enable_ip+0x161/0x230 [ 29.449093] ? _raw_spin_unlock_bh+0x30/0x40 [ 29.453481] ? release_sock+0x1e2/0x2b0 [ 29.457432] ? __release_sock+0x3a0/0x3a0 [ 29.461559] ? __local_bh_enable_ip+0x161/0x230 [ 29.466209] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 29.471378] ? smc_setsockopt+0x1ed/0x6d0 [ 29.475507] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.481022] ? __sys_setsockopt+0x24f/0x390 [ 29.485323] do_group_exit+0x16f/0x430 [ 29.489199] ? mm_fault_error+0x380/0x380 [ 29.493327] ? __ia32_sys_exit+0x50/0x50 [ 29.497368] ? do_syscall_64+0x92/0x800 [ 29.501323] __x64_sys_exit_group+0x3e/0x50 [ 29.505623] do_syscall_64+0x1b1/0x800 [ 29.509489] ? syscall_return_slowpath+0x5c0/0x5c0 [ 29.514395] ? syscall_return_slowpath+0x30f/0x5c0 [ 29.519305] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 29.524646] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.529487] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 29.534659] RIP: 0033:0x43e8d8 [ 29.537826] RSP: 002b:00007ffc551616f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 29.545512] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 29.552757] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 29.560014] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 29.567271] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 29.574523] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 29.582344] Dumping ftrace buffer: [ 29.585964] (ftrace buffer empty) [ 29.589649] Kernel Offset: disabled [ 29.593253] Rebooting in 86400 seconds..