[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.030118] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.983511] random: sshd: uninitialized urandom read (32 bytes read) [ 24.415259] random: sshd: uninitialized urandom read (32 bytes read) [ 25.106855] random: sshd: uninitialized urandom read (32 bytes read) [ 36.654893] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.63' (ECDSA) to the list of known hosts. [ 42.083093] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 42.173783] WARNING: CPU: 1 PID: 4492 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 42.182155] Kernel panic - not syncing: panic_on_warn set ... [ 42.182155] [ 42.189512] CPU: 1 PID: 4492 Comm: syz-executor784 Not tainted 4.17.0-rc3+ #35 [ 42.196850] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.206186] Call Trace: [ 42.208765] dump_stack+0x1b9/0x294 [ 42.212374] ? dump_stack_print_info.cold.2+0x52/0x52 [ 42.217550] ? smc_unhash_sk+0x310/0x4a0 [ 42.221593] panic+0x22f/0x4de [ 42.224763] ? add_taint.cold.5+0x16/0x16 [ 42.228893] ? __warn.cold.8+0x148/0x1b3 [ 42.232934] ? __warn.cold.8+0x117/0x1b3 [ 42.237082] ? smc_unhash_sk+0x345/0x4a0 [ 42.241164] __warn.cold.8+0x163/0x1b3 [ 42.245050] ? smc_unhash_sk+0x345/0x4a0 [ 42.249092] report_bug+0x252/0x2d0 [ 42.252700] do_error_trap+0x1de/0x490 [ 42.256568] ? graph_lock+0x170/0x170 [ 42.260356] ? math_error+0x420/0x420 [ 42.264149] ? lock_acquire+0x1dc/0x520 [ 42.268197] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 42.273023] do_invalid_op+0x1b/0x20 [ 42.276716] invalid_op+0x14/0x20 [ 42.280205] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 42.284848] RSP: 0018:ffff8801adf37488 EFLAGS: 00010293 [ 42.290189] RAX: ffff8801b7680500 RBX: ffff8801ade0e7c0 RCX: ffffffff87402b7e [ 42.297441] RDX: 0000000000000000 RSI: ffffffff87402c35 RDI: 0000000000000005 [ 42.304913] RBP: ffff8801adf37570 R08: ffff8801b7680500 R09: ffffed0035bc1d08 [ 42.312173] R10: ffffed0035bc1d08 R11: ffff8801ade0e843 R12: 1ffff10035be6e95 [ 42.319426] R13: ffff8801adf37548 R14: ffffffff8970e8a0 R15: ffff8801ade0e840 [ 42.326689] ? smc_unhash_sk+0x28e/0x4a0 [ 42.330735] ? smc_unhash_sk+0x345/0x4a0 [ 42.334779] ? smc_unhash_sk+0x345/0x4a0 [ 42.338826] ? smc_rx_data_available+0x100/0x100 [ 42.343564] ? release_sock+0x1e2/0x2b0 [ 42.347520] ? __local_bh_enable_ip+0x161/0x230 [ 42.352166] ? __release_sock+0x3a0/0x3a0 [ 42.356293] ? smc_release+0x269/0x610 [ 42.360160] ? trace_hardirqs_on+0xd/0x10 [ 42.364298] ? __local_bh_enable_ip+0x161/0x230 [ 42.368947] smc_release+0x36e/0x610 [ 42.372647] sock_release+0x96/0x1b0 [ 42.376344] ? sock_alloc_file+0x4e0/0x4e0 [ 42.380645] sock_close+0x16/0x20 [ 42.384077] __fput+0x34d/0x890 [ 42.387345] ? fput+0x1a0/0x1a0 [ 42.390634] ? _raw_spin_unlock_irq+0x27/0x70 [ 42.395110] ____fput+0x15/0x20 [ 42.398371] task_work_run+0x1e4/0x290 [ 42.402235] ? task_work_cancel+0x240/0x240 [ 42.406539] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 42.412053] ? switch_task_namespaces+0xa2/0xd0 [ 42.416700] do_exit+0x1aee/0x2730 [ 42.420222] ? mm_update_next_owner+0x980/0x980 [ 42.424872] ? kasan_check_write+0x14/0x20 [ 42.429090] ? do_raw_spin_lock+0xc1/0x200 [ 42.433305] ? trace_hardirqs_off+0xd/0x10 [ 42.437517] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 42.442706] ? debug_check_no_obj_freed+0x2ff/0x584 [ 42.447700] ? __local_bh_enable_ip+0x161/0x230 [ 42.452350] ? kasan_check_read+0x11/0x20 [ 42.456565] ? rcu_is_watching+0x85/0x140 [ 42.460692] ? rcu_pm_notify+0xc0/0xc0 [ 42.464648] ? ___sys_sendmsg+0x31a/0x940 [ 42.469384] ? kfree+0x1e9/0x260 [ 42.472728] ? ___sys_sendmsg+0x31f/0x940 [ 42.476857] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.482377] ? copy_msghdr_from_user+0x560/0x560 [ 42.487117] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 42.491860] ? graph_lock+0x170/0x170 [ 42.495650] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.501168] ? __fget_light+0x2ef/0x430 [ 42.505123] ? fget_raw+0x20/0x20 [ 42.508555] ? find_held_lock+0x36/0x1c0 [ 42.512623] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 42.518157] ? sockfd_lookup_light+0xc5/0x160 [ 42.522635] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.528149] ? __sys_sendmsg+0x1aa/0x270 [ 42.532189] ? __ia32_sys_shutdown+0x80/0x80 [ 42.536578] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.542095] ? __do_page_fault+0x441/0xe40 [ 42.546321] do_group_exit+0x16f/0x430 [ 42.550191] ? __ia32_sys_exit+0x50/0x50 [ 42.554242] ? do_syscall_64+0x92/0x800 [ 42.558196] __x64_sys_exit_group+0x3e/0x50 [ 42.562498] do_syscall_64+0x1b1/0x800 [ 42.566368] ? syscall_return_slowpath+0x5c0/0x5c0 [ 42.571280] ? syscall_return_slowpath+0x30f/0x5c0 [ 42.576192] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 42.581553] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 42.586389] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 42.591559] RIP: 0033:0x43eab8 [ 42.594727] RSP: 002b:00007fff1b258068 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 42.602413] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043eab8 [ 42.609781] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 42.617119] RBP: 00000000004be460 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 42.624370] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 42.631628] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 42.639690] Dumping ftrace buffer: [ 42.643298] (ftrace buffer empty) [ 42.646999] Kernel Offset: disabled [ 42.650608] Rebooting in 86400 seconds..