[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.767188] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.252343] random: sshd: uninitialized urandom read (32 bytes read) [ 25.653389] random: sshd: uninitialized urandom read (32 bytes read) [ 26.401322] random: sshd: uninitialized urandom read (32 bytes read) [ 26.558045] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.28' (ECDSA) to the list of known hosts. [ 32.014523] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.128434] WARNING: CPU: 0 PID: 4506 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 32.136935] Kernel panic - not syncing: panic_on_warn set ... [ 32.136935] [ 32.144287] CPU: 0 PID: 4506 Comm: syz-executor844 Not tainted 4.17.0-rc4+ #55 [ 32.151624] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.160957] Call Trace: [ 32.163554] dump_stack+0x1b9/0x294 [ 32.167175] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.172447] ? smc_unhash_sk+0x340/0x4a0 [ 32.176519] panic+0x22f/0x4de [ 32.179691] ? add_taint.cold.5+0x16/0x16 [ 32.183819] ? __warn.cold.8+0x148/0x1b3 [ 32.187890] ? __warn.cold.8+0x117/0x1b3 [ 32.191941] ? smc_unhash_sk+0x345/0x4a0 [ 32.195986] __warn.cold.8+0x163/0x1b3 [ 32.199858] ? smc_unhash_sk+0x345/0x4a0 [ 32.203901] report_bug+0x252/0x2d0 [ 32.207518] do_error_trap+0x1de/0x490 [ 32.211400] ? graph_lock+0x170/0x170 [ 32.215192] ? math_error+0x420/0x420 [ 32.218978] ? lock_acquire+0x1dc/0x520 [ 32.222938] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.227774] do_invalid_op+0x1b/0x20 [ 32.231473] invalid_op+0x14/0x20 [ 32.234907] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 32.239551] RSP: 0018:ffff8801d9087488 EFLAGS: 00010293 [ 32.244896] RAX: ffff8801d9234380 RBX: ffff8801acb767c0 RCX: ffffffff8740fd4e [ 32.252157] RDX: 0000000000000000 RSI: ffffffff8740fe05 RDI: 0000000000000005 [ 32.259582] RBP: ffff8801d9087570 R08: ffff8801d9234380 R09: ffffed003596ed08 [ 32.266844] R10: ffffed003596ed08 R11: ffff8801acb76843 R12: 1ffff1003b210e95 [ 32.274094] R13: ffff8801d9087548 R14: ffffffff8970dd60 R15: ffff8801acb76840 [ 32.281360] ? smc_unhash_sk+0x28e/0x4a0 [ 32.285406] ? smc_unhash_sk+0x345/0x4a0 [ 32.289451] ? smc_unhash_sk+0x345/0x4a0 [ 32.293494] ? smc_rx_data_available+0x100/0x100 [ 32.298239] ? release_sock+0x1e2/0x2b0 [ 32.302208] ? __local_bh_enable_ip+0x161/0x230 [ 32.306858] ? __release_sock+0x3a0/0x3a0 [ 32.310987] ? smc_release+0x269/0x610 [ 32.314860] ? trace_hardirqs_on+0xd/0x10 [ 32.318991] ? __local_bh_enable_ip+0x161/0x230 [ 32.323646] smc_release+0x36e/0x610 [ 32.327352] sock_release+0x96/0x1b0 [ 32.331049] ? sock_alloc_file+0x4e0/0x4e0 [ 32.335265] sock_close+0x16/0x20 [ 32.338710] __fput+0x34d/0x890 [ 32.341973] ? fput+0x1a0/0x1a0 [ 32.345244] ? _raw_spin_unlock_irq+0x27/0x70 [ 32.349721] ____fput+0x15/0x20 [ 32.352981] task_work_run+0x1e4/0x290 [ 32.356851] ? task_work_cancel+0x240/0x240 [ 32.361173] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 32.366692] ? switch_task_namespaces+0xa2/0xd0 [ 32.371430] do_exit+0x1aee/0x2730 [ 32.374954] ? mm_update_next_owner+0x980/0x980 [ 32.379613] ? lock_downgrade+0x8e0/0x8e0 [ 32.384610] ? noop_count+0x40/0x40 [ 32.388227] ? lock_pin_lock+0x350/0x350 [ 32.392272] ? kasan_check_read+0x11/0x20 [ 32.396401] ? rcu_is_watching+0x85/0x140 [ 32.400529] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 32.405710] ? is_bpf_text_address+0xd7/0x170 [ 32.410197] ? check_usage_backwards+0x151/0x3a0 [ 32.414933] ? graph_lock+0x170/0x170 [ 32.418713] ? graph_lock+0x170/0x170 [ 32.422511] ? find_held_lock+0x36/0x1c0 [ 32.426556] ? lock_downgrade+0x8e0/0x8e0 [ 32.430688] ? kasan_check_read+0x11/0x20 [ 32.434818] ? do_raw_spin_unlock+0x9e/0x2e0 [ 32.439211] ? __local_bh_enable_ip+0x161/0x230 [ 32.443864] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.448872] ? release_sock+0x1e2/0x2b0 [ 32.452828] ? trace_hardirqs_on+0xd/0x10 [ 32.456957] ? __local_bh_enable_ip+0x161/0x230 [ 32.461623] ? _raw_spin_unlock_bh+0x30/0x40 [ 32.466031] ? release_sock+0x1e2/0x2b0 [ 32.470089] ? __release_sock+0x3a0/0x3a0 [ 32.474223] ? __local_bh_enable_ip+0x161/0x230 [ 32.478966] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 32.484146] ? smc_setsockopt+0x1ed/0x6d0 [ 32.488289] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.493805] ? __sys_setsockopt+0x24f/0x390 [ 32.498125] do_group_exit+0x16f/0x430 [ 32.502019] ? mm_fault_error+0x380/0x380 [ 32.506170] ? __ia32_sys_exit+0x50/0x50 [ 32.510220] ? do_syscall_64+0x92/0x800 [ 32.514192] __x64_sys_exit_group+0x3e/0x50 [ 32.518515] do_syscall_64+0x1b1/0x800 [ 32.522398] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.527313] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.532240] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 32.537586] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.542412] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.547849] RIP: 0033:0x43e8b8 [ 32.551032] RSP: 002b:00007ffd1e9db408 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 32.558733] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8b8 [ 32.565985] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 32.573243] RBP: 00000000004be260 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 32.580507] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 32.587758] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 32.595734] Dumping ftrace buffer: [ 32.599384] (ftrace buffer empty) [ 32.603072] Kernel Offset: disabled [ 32.606682] Rebooting in 86400 seconds..