[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.284547] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.201385] random: sshd: uninitialized urandom read (32 bytes read) [ 22.422625] random: sshd: uninitialized urandom read (32 bytes read) [ 23.233460] random: sshd: uninitialized urandom read (32 bytes read) [ 23.557652] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.29' (ECDSA) to the list of known hosts. [ 28.959485] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.053761] WARNING: CPU: 0 PID: 4491 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 29.062162] Kernel panic - not syncing: panic_on_warn set ... [ 29.062162] [ 29.069511] CPU: 0 PID: 4491 Comm: syz-executor483 Not tainted 4.17.0-rc4+ #52 [ 29.076848] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.086179] Call Trace: [ 29.088756] dump_stack+0x1b9/0x294 [ 29.092376] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.097551] ? smc_unhash_sk+0x2f0/0x4a0 [ 29.101592] panic+0x22f/0x4de [ 29.104763] ? add_taint.cold.5+0x16/0x16 [ 29.108892] ? __warn.cold.8+0x148/0x1b3 [ 29.112932] ? __warn.cold.8+0x117/0x1b3 [ 29.116984] ? smc_unhash_sk+0x345/0x4a0 [ 29.121036] __warn.cold.8+0x163/0x1b3 [ 29.124913] ? smc_unhash_sk+0x345/0x4a0 [ 29.128955] report_bug+0x252/0x2d0 [ 29.132563] do_error_trap+0x1de/0x490 [ 29.136435] ? graph_lock+0x170/0x170 [ 29.140213] ? math_error+0x420/0x420 [ 29.144014] ? lock_acquire+0x1dc/0x520 [ 29.147986] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.152819] do_invalid_op+0x1b/0x20 [ 29.156516] invalid_op+0x14/0x20 [ 29.159951] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 29.164595] RSP: 0018:ffff8801afcbf488 EFLAGS: 00010293 [ 29.169938] RAX: ffff8801afa84240 RBX: ffff8801b13587c0 RCX: ffffffff8740fa9e [ 29.177186] RDX: 0000000000000000 RSI: ffffffff8740fb55 RDI: 0000000000000005 [ 29.184435] RBP: ffff8801afcbf570 R08: ffff8801afa84240 R09: ffffed003626b108 [ 29.191691] R10: ffffed003626b108 R11: ffff8801b1358843 R12: 1ffff10035f97e95 [ 29.198939] R13: ffff8801afcbf548 R14: ffffffff8970dc60 R15: ffff8801b1358840 [ 29.206200] ? smc_unhash_sk+0x28e/0x4a0 [ 29.210242] ? smc_unhash_sk+0x345/0x4a0 [ 29.214290] ? smc_unhash_sk+0x345/0x4a0 [ 29.218335] ? smc_rx_data_available+0x100/0x100 [ 29.223073] ? release_sock+0x1e2/0x2b0 [ 29.227038] ? __local_bh_enable_ip+0x161/0x230 [ 29.231687] ? __release_sock+0x3a0/0x3a0 [ 29.235822] ? smc_release+0x269/0x610 [ 29.239691] ? trace_hardirqs_on+0xd/0x10 [ 29.243825] ? __local_bh_enable_ip+0x161/0x230 [ 29.248474] smc_release+0x36e/0x610 [ 29.252171] sock_release+0x96/0x1b0 [ 29.255872] ? sock_alloc_file+0x4e0/0x4e0 [ 29.260090] sock_close+0x16/0x20 [ 29.263526] __fput+0x34d/0x890 [ 29.266804] ? fput+0x1a0/0x1a0 [ 29.270069] ? _raw_spin_unlock_irq+0x27/0x70 [ 29.274546] ____fput+0x15/0x20 [ 29.277814] task_work_run+0x1e4/0x290 [ 29.281680] ? task_work_cancel+0x240/0x240 [ 29.285983] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 29.291501] ? switch_task_namespaces+0xa2/0xd0 [ 29.296152] do_exit+0x1aee/0x2730 [ 29.299675] ? mm_update_next_owner+0x980/0x980 [ 29.304326] ? lock_downgrade+0x8e0/0x8e0 [ 29.308454] ? noop_count+0x40/0x40 [ 29.312063] ? lock_pin_lock+0x350/0x350 [ 29.316108] ? kasan_check_read+0x11/0x20 [ 29.320239] ? rcu_is_watching+0x85/0x140 [ 29.324370] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 29.329543] ? is_bpf_text_address+0xd7/0x170 [ 29.334025] ? check_usage_backwards+0x151/0x3a0 [ 29.338762] ? graph_lock+0x170/0x170 [ 29.342539] ? graph_lock+0x170/0x170 [ 29.346322] ? find_held_lock+0x36/0x1c0 [ 29.350366] ? lock_downgrade+0x8e0/0x8e0 [ 29.354495] ? kasan_check_read+0x11/0x20 [ 29.358621] ? do_raw_spin_unlock+0x9e/0x2e0 [ 29.363016] ? __local_bh_enable_ip+0x161/0x230 [ 29.367671] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.372679] ? release_sock+0x1e2/0x2b0 [ 29.376631] ? trace_hardirqs_on+0xd/0x10 [ 29.380758] ? __local_bh_enable_ip+0x161/0x230 [ 29.385410] ? _raw_spin_unlock_bh+0x30/0x40 [ 29.389798] ? release_sock+0x1e2/0x2b0 [ 29.393758] ? __release_sock+0x3a0/0x3a0 [ 29.397885] ? __local_bh_enable_ip+0x161/0x230 [ 29.402534] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 29.407705] ? smc_setsockopt+0x1ed/0x6d0 [ 29.411846] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.417369] ? __sys_setsockopt+0x24f/0x390 [ 29.421673] do_group_exit+0x16f/0x430 [ 29.425540] ? mm_fault_error+0x380/0x380 [ 29.429675] ? __ia32_sys_exit+0x50/0x50 [ 29.433717] ? do_syscall_64+0x92/0x800 [ 29.437672] __x64_sys_exit_group+0x3e/0x50 [ 29.441984] do_syscall_64+0x1b1/0x800 [ 29.445852] ? syscall_return_slowpath+0x5c0/0x5c0 [ 29.450761] ? syscall_return_slowpath+0x30f/0x5c0 [ 29.455675] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 29.461029] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.465871] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 29.471042] RIP: 0033:0x43e8c8 [ 29.474211] RSP: 002b:00007ffe00423008 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 29.481903] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8c8 [ 29.489151] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 29.496402] RBP: 00000000004be260 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 29.503658] R10: 0000000020000100 R11: 0000000000000246 R12: 0000000000000001 [ 29.510906] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 29.518771] Dumping ftrace buffer: [ 29.522406] (ftrace buffer empty) [ 29.526092] Kernel Offset: disabled [ 29.529700] Rebooting in 86400 seconds..