[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.280177] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 21.067821] random: sshd: uninitialized urandom read (32 bytes read) [ 21.464461] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.181866] random: sshd: uninitialized urandom read (32 bytes read) [ 22.346816] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.37' (ECDSA) to the list of known hosts. [ 27.820088] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.914440] WARNING: CPU: 1 PID: 4513 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 27.922841] Kernel panic - not syncing: panic_on_warn set ... [ 27.922841] [ 27.930196] CPU: 1 PID: 4513 Comm: syz-executor939 Not tainted 4.17.0-rc2+ #32 [ 27.937536] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.946872] Call Trace: [ 27.949450] dump_stack+0x1b9/0x294 [ 27.953066] ? dump_stack_print_info.cold.2+0x52/0x52 [ 27.958246] ? smc_unhash_sk+0x2f0/0x4a0 [ 27.962293] panic+0x22f/0x4de [ 27.965467] ? add_taint.cold.5+0x16/0x16 [ 27.969598] ? __warn.cold.8+0x148/0x1b3 [ 27.973646] ? __warn.cold.8+0x117/0x1b3 [ 27.977704] ? smc_unhash_sk+0x345/0x4a0 [ 27.981750] __warn.cold.8+0x163/0x1b3 [ 27.985623] ? smc_unhash_sk+0x345/0x4a0 [ 27.989680] report_bug+0x252/0x2d0 [ 27.993296] do_error_trap+0x1de/0x490 [ 27.997170] ? graph_lock+0x170/0x170 [ 28.000952] ? math_error+0x420/0x420 [ 28.004743] ? lock_acquire+0x1dc/0x520 [ 28.008721] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.013558] do_invalid_op+0x1b/0x20 [ 28.017258] invalid_op+0x14/0x20 [ 28.020699] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 28.025346] RSP: 0018:ffff8801ad9a7488 EFLAGS: 00010293 [ 28.030696] RAX: ffff8801ad5f6700 RBX: ffff8801af2b97c0 RCX: ffffffff873fce9e [ 28.037947] RDX: 0000000000000000 RSI: ffffffff873fcf55 RDI: 0000000000000005 [ 28.045197] RBP: ffff8801ad9a7570 R08: ffff8801ad5f6700 R09: ffffed0035e57308 [ 28.052451] R10: ffffed0035e57308 R11: ffff8801af2b9843 R12: 1ffff10035b34e95 [ 28.059707] R13: ffff8801ad9a7548 R14: ffffffff8970e060 R15: ffff8801af2b9840 [ 28.066989] ? smc_unhash_sk+0x28e/0x4a0 [ 28.071076] ? smc_unhash_sk+0x345/0x4a0 [ 28.075133] ? smc_unhash_sk+0x345/0x4a0 [ 28.079181] ? smc_hash_sk+0x2f0/0x2f0 [ 28.083065] ? release_sock+0x1e2/0x2b0 [ 28.087041] ? __local_bh_enable_ip+0x161/0x230 [ 28.091709] ? __release_sock+0x3a0/0x3a0 [ 28.095844] ? smc_release+0x269/0x610 [ 28.099722] ? trace_hardirqs_on+0xd/0x10 [ 28.103859] ? __local_bh_enable_ip+0x161/0x230 [ 28.108517] smc_release+0x36e/0x610 [ 28.112222] sock_release+0x96/0x1b0 [ 28.115920] ? sock_alloc_file+0x4e0/0x4e0 [ 28.120137] sock_close+0x16/0x20 [ 28.123573] __fput+0x34d/0x890 [ 28.126836] ? fput+0x1a0/0x1a0 [ 28.130101] ? _raw_spin_unlock_irq+0x27/0x70 [ 28.134596] ____fput+0x15/0x20 [ 28.137859] task_work_run+0x1e4/0x290 [ 28.141735] ? task_work_cancel+0x240/0x240 [ 28.146050] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 28.151579] ? switch_task_namespaces+0xa2/0xd0 [ 28.156238] do_exit+0x1aee/0x2730 [ 28.159770] ? mm_update_next_owner+0x980/0x980 [ 28.164423] ? lock_downgrade+0x8e0/0x8e0 [ 28.168559] ? noop_count+0x40/0x40 [ 28.172173] ? lock_pin_lock+0x350/0x350 [ 28.176226] ? kasan_check_read+0x11/0x20 [ 28.180366] ? rcu_is_watching+0x85/0x140 [ 28.184509] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 28.189696] ? is_bpf_text_address+0xd7/0x170 [ 28.194183] ? check_usage_backwards+0x151/0x3a0 [ 28.198925] ? graph_lock+0x170/0x170 [ 28.202711] ? graph_lock+0x170/0x170 [ 28.206502] ? find_held_lock+0x36/0x1c0 [ 28.210554] ? lock_downgrade+0x8e0/0x8e0 [ 28.214695] ? kasan_check_read+0x11/0x20 [ 28.218828] ? do_raw_spin_unlock+0x9e/0x2e0 [ 28.223226] ? __local_bh_enable_ip+0x161/0x230 [ 28.227880] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.232883] ? release_sock+0x1e2/0x2b0 [ 28.236838] ? trace_hardirqs_on+0xd/0x10 [ 28.240981] ? __local_bh_enable_ip+0x161/0x230 [ 28.245644] ? _raw_spin_unlock_bh+0x30/0x40 [ 28.250045] ? release_sock+0x1e2/0x2b0 [ 28.254011] ? __release_sock+0x3a0/0x3a0 [ 28.258164] ? __local_bh_enable_ip+0x161/0x230 [ 28.262822] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 28.268001] ? smc_setsockopt+0x1ed/0x630 [ 28.272149] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.277679] ? __sys_setsockopt+0x24f/0x390 [ 28.282007] do_group_exit+0x16f/0x430 [ 28.285887] ? mm_fault_error+0x380/0x380 [ 28.290040] ? __ia32_sys_exit+0x50/0x50 [ 28.294096] ? do_syscall_64+0x92/0x800 [ 28.298061] __x64_sys_exit_group+0x3e/0x50 [ 28.302366] do_syscall_64+0x1b1/0x800 [ 28.306240] ? syscall_return_slowpath+0x5c0/0x5c0 [ 28.311171] ? syscall_return_slowpath+0x30f/0x5c0 [ 28.316091] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 28.321439] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.326270] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 28.331442] RIP: 0033:0x43e8d8 [ 28.334611] RSP: 002b:00007ffe2b086f98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 28.342300] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 28.349552] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 28.356804] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 28.364060] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 28.371312] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 28.378779] Dumping ftrace buffer: [ 28.382435] (ftrace buffer empty) [ 28.386141] Kernel Offset: disabled [ 28.389752] Rebooting in 86400 seconds..