[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.305982] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.290434] random: sshd: uninitialized urandom read (32 bytes read) [ 24.546859] random: sshd: uninitialized urandom read (32 bytes read) [ 25.319049] random: sshd: uninitialized urandom read (32 bytes read) [ 25.480308] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.61' (ECDSA) to the list of known hosts. [ 31.037273] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.130572] WARNING: CPU: 1 PID: 4534 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 31.138984] Kernel panic - not syncing: panic_on_warn set ... [ 31.138984] [ 31.146346] CPU: 1 PID: 4534 Comm: syz-executor818 Not tainted 4.17.0-rc4+ #48 [ 31.153729] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.163061] Call Trace: [ 31.165635] dump_stack+0x1b9/0x294 [ 31.169241] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.174452] ? smc_unhash_sk+0x2b0/0x4a0 [ 31.178495] panic+0x22f/0x4de [ 31.181670] ? add_taint.cold.5+0x16/0x16 [ 31.185806] ? __warn.cold.8+0x148/0x1b3 [ 31.189882] ? __warn.cold.8+0x117/0x1b3 [ 31.193952] ? smc_unhash_sk+0x345/0x4a0 [ 31.197995] __warn.cold.8+0x163/0x1b3 [ 31.201898] ? smc_unhash_sk+0x345/0x4a0 [ 31.205948] report_bug+0x252/0x2d0 [ 31.209564] do_error_trap+0x1de/0x490 [ 31.213440] ? graph_lock+0x170/0x170 [ 31.217224] ? math_error+0x420/0x420 [ 31.221015] ? lock_acquire+0x1dc/0x520 [ 31.224982] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.229807] do_invalid_op+0x1b/0x20 [ 31.233504] invalid_op+0x14/0x20 [ 31.236938] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 31.241582] RSP: 0018:ffff8801caf6f488 EFLAGS: 00010293 [ 31.246933] RAX: ffff8801b0d64480 RBX: ffff8801b0d607c0 RCX: ffffffff8740e9de [ 31.254187] RDX: 0000000000000000 RSI: ffffffff8740ea95 RDI: 0000000000000005 [ 31.261435] RBP: ffff8801caf6f570 R08: ffff8801b0d64480 R09: ffffed00361ac108 [ 31.268682] R10: ffffed00361ac108 R11: ffff8801b0d60843 R12: 1ffff100395ede95 [ 31.276024] R13: ffff8801caf6f548 R14: ffffffff8970d5e0 R15: ffff8801b0d60840 [ 31.283296] ? smc_unhash_sk+0x28e/0x4a0 [ 31.287343] ? smc_unhash_sk+0x345/0x4a0 [ 31.291396] ? smc_unhash_sk+0x345/0x4a0 [ 31.295439] ? smc_rx_data_available+0x100/0x100 [ 31.300174] ? release_sock+0x1e2/0x2b0 [ 31.304136] ? __local_bh_enable_ip+0x161/0x230 [ 31.308799] ? __release_sock+0x3a0/0x3a0 [ 31.312930] ? smc_release+0x269/0x610 [ 31.316802] ? trace_hardirqs_on+0xd/0x10 [ 31.320934] ? __local_bh_enable_ip+0x161/0x230 [ 31.325586] smc_release+0x36e/0x610 [ 31.329287] sock_release+0x96/0x1b0 [ 31.332985] ? sock_alloc_file+0x4e0/0x4e0 [ 31.337215] sock_close+0x16/0x20 [ 31.340657] __fput+0x34d/0x890 [ 31.343923] ? fput+0x1a0/0x1a0 [ 31.347189] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.351670] ____fput+0x15/0x20 [ 31.354935] task_work_run+0x1e4/0x290 [ 31.358805] ? task_work_cancel+0x240/0x240 [ 31.363120] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.368638] ? switch_task_namespaces+0xa2/0xd0 [ 31.373292] do_exit+0x1aee/0x2730 [ 31.376819] ? mm_update_next_owner+0x980/0x980 [ 31.381471] ? lock_downgrade+0x8e0/0x8e0 [ 31.385602] ? noop_count+0x40/0x40 [ 31.389219] ? lock_pin_lock+0x350/0x350 [ 31.393266] ? kasan_check_read+0x11/0x20 [ 31.397393] ? rcu_is_watching+0x85/0x140 [ 31.401521] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 31.406705] ? is_bpf_text_address+0xd7/0x170 [ 31.411186] ? check_usage_backwards+0x151/0x3a0 [ 31.415930] ? graph_lock+0x170/0x170 [ 31.419708] ? graph_lock+0x170/0x170 [ 31.423498] ? find_held_lock+0x36/0x1c0 [ 31.427545] ? lock_downgrade+0x8e0/0x8e0 [ 31.431681] ? kasan_check_read+0x11/0x20 [ 31.435817] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.440206] ? __local_bh_enable_ip+0x161/0x230 [ 31.444859] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.449872] ? release_sock+0x1e2/0x2b0 [ 31.454004] ? trace_hardirqs_on+0xd/0x10 [ 31.458417] ? __local_bh_enable_ip+0x161/0x230 [ 31.463085] ? _raw_spin_unlock_bh+0x30/0x40 [ 31.467480] ? release_sock+0x1e2/0x2b0 [ 31.471448] ? __release_sock+0x3a0/0x3a0 [ 31.475583] ? __local_bh_enable_ip+0x161/0x230 [ 31.480239] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 31.485416] ? smc_setsockopt+0x1ed/0x6d0 [ 31.489548] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.495072] ? __sys_setsockopt+0x24f/0x390 [ 31.499394] do_group_exit+0x16f/0x430 [ 31.503264] ? mm_fault_error+0x380/0x380 [ 31.507397] ? __ia32_sys_exit+0x50/0x50 [ 31.511444] ? do_syscall_64+0x92/0x800 [ 31.515403] __x64_sys_exit_group+0x3e/0x50 [ 31.519711] do_syscall_64+0x1b1/0x800 [ 31.523593] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.528510] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.533428] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.538777] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.543711] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.548978] RIP: 0033:0x43e8d8 [ 31.552146] RSP: 002b:00007ffc28510908 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 31.559843] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 31.567101] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 31.574353] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 31.581611] R10: 0000000020000140 R11: 0000000000000246 R12: 0000000000000001 [ 31.588867] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 31.596880] Dumping ftrace buffer: [ 31.600539] (ftrace buffer empty) [ 31.604231] Kernel Offset: disabled [ 31.607844] Rebooting in 86400 seconds..