[....] Starting OpenBSD Secure Shell server: sshd[ 22.047618] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.852595] random: sshd: uninitialized urandom read (32 bytes read) [ 26.230846] random: sshd: uninitialized urandom read (32 bytes read) [ 27.001567] sshd (4534) used greatest stack depth: 16376 bytes left [ 27.021478] random: sshd: uninitialized urandom read (32 bytes read) [ 27.193686] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.20' (ECDSA) to the list of known hosts. [ 32.842245] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.945082] WARNING: CPU: 0 PID: 4549 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 32.953650] Kernel panic - not syncing: panic_on_warn set ... [ 32.953650] [ 32.961015] CPU: 0 PID: 4549 Comm: syz-executor261 Not tainted 4.17.0-rc3+ #40 [ 32.968378] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.977764] Call Trace: [ 32.980376] dump_stack+0x1b9/0x294 [ 32.984004] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.989198] ? smc_unhash_sk+0x280/0x4a0 [ 32.993246] panic+0x22f/0x4de [ 32.996424] ? add_taint.cold.5+0x16/0x16 [ 33.000576] ? __warn.cold.8+0x148/0x1b3 [ 33.004632] ? __warn.cold.8+0x117/0x1b3 [ 33.008682] ? smc_unhash_sk+0x345/0x4a0 [ 33.012744] __warn.cold.8+0x163/0x1b3 [ 33.016642] ? smc_unhash_sk+0x345/0x4a0 [ 33.020699] report_bug+0x252/0x2d0 [ 33.024330] do_error_trap+0x1de/0x490 [ 33.028218] ? graph_lock+0x170/0x170 [ 33.032023] ? math_error+0x420/0x420 [ 33.035836] ? lock_acquire+0x1dc/0x520 [ 33.039834] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.044677] do_invalid_op+0x1b/0x20 [ 33.048387] invalid_op+0x14/0x20 [ 33.051831] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 33.056492] RSP: 0018:ffff8801b6b0f488 EFLAGS: 00010293 [ 33.061989] RAX: ffff8801ad2d8680 RBX: ffff8801d976c7c0 RCX: ffffffff87402a0e [ 33.069260] RDX: 0000000000000000 RSI: ffffffff87402ac5 RDI: 0000000000000005 [ 33.076526] RBP: ffff8801b6b0f570 R08: ffff8801ad2d8680 R09: ffffed003b2ed908 [ 33.083810] R10: ffffed003b2ed908 R11: ffff8801d976c843 R12: 1ffff10036d61e95 [ 33.091108] R13: ffff8801b6b0f548 R14: ffffffff8970caa0 R15: ffff8801d976c840 [ 33.098476] ? smc_unhash_sk+0x28e/0x4a0 [ 33.102532] ? smc_unhash_sk+0x345/0x4a0 [ 33.106594] ? smc_unhash_sk+0x345/0x4a0 [ 33.110652] ? smc_rx_data_available+0x100/0x100 [ 33.115404] ? release_sock+0x1e2/0x2b0 [ 33.119388] ? __local_bh_enable_ip+0x161/0x230 [ 33.124092] ? __release_sock+0x3a0/0x3a0 [ 33.128254] ? smc_release+0x269/0x610 [ 33.132147] ? trace_hardirqs_on+0xd/0x10 [ 33.136292] ? __local_bh_enable_ip+0x161/0x230 [ 33.140950] smc_release+0x36e/0x610 [ 33.144657] sock_release+0x96/0x1b0 [ 33.149271] ? sock_alloc_file+0x4e0/0x4e0 [ 33.153518] sock_close+0x16/0x20 [ 33.156966] __fput+0x34d/0x890 [ 33.160275] ? fput+0x1a0/0x1a0 [ 33.163563] ? _raw_spin_unlock_irq+0x27/0x70 [ 33.168063] ____fput+0x15/0x20 [ 33.171348] task_work_run+0x1e4/0x290 [ 33.175241] ? task_work_cancel+0x240/0x240 [ 33.179577] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 33.185110] ? switch_task_namespaces+0xa2/0xd0 [ 33.189770] do_exit+0x1aee/0x2730 [ 33.193318] ? mm_update_next_owner+0x980/0x980 [ 33.197978] ? kasan_check_read+0x11/0x20 [ 33.202126] ? do_raw_spin_unlock+0x9e/0x2e0 [ 33.206523] ? __local_bh_enable_ip+0x161/0x230 [ 33.211175] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 33.216190] ? release_sock+0x1e2/0x2b0 [ 33.220151] ? trace_hardirqs_on+0xd/0x10 [ 33.224291] ? __local_bh_enable_ip+0x161/0x230 [ 33.228952] ? _raw_spin_unlock_bh+0x30/0x40 [ 33.233359] ? kasan_check_read+0x11/0x20 [ 33.237514] ? rcu_is_watching+0x85/0x140 [ 33.241659] ? rcu_pm_notify+0xc0/0xc0 [ 33.245542] ? ___sys_sendmsg+0x31a/0x940 [ 33.249699] ? kfree+0x1e9/0x260 [ 33.253061] ? ___sys_sendmsg+0x31f/0x940 [ 33.257199] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.262725] ? __handle_mm_fault+0x93a/0x4310 [ 33.267207] ? copy_msghdr_from_user+0x560/0x560 [ 33.271954] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 33.276712] ? graph_lock+0x170/0x170 [ 33.280539] ? find_held_lock+0x36/0x1c0 [ 33.284623] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.290160] ? __fget_light+0x2ef/0x430 [ 33.294138] ? fget_raw+0x20/0x20 [ 33.297587] ? find_held_lock+0x36/0x1c0 [ 33.301652] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 33.307204] ? sockfd_lookup_light+0xc5/0x160 [ 33.311709] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.317245] ? __sys_sendmsg+0x1aa/0x270 [ 33.321308] ? __ia32_sys_shutdown+0x80/0x80 [ 33.325719] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.331270] ? __do_page_fault+0x441/0xe40 [ 33.335502] do_group_exit+0x16f/0x430 [ 33.339379] ? __ia32_sys_exit+0x50/0x50 [ 33.343427] ? do_syscall_64+0x92/0x800 [ 33.347390] __x64_sys_exit_group+0x3e/0x50 [ 33.351704] do_syscall_64+0x1b1/0x800 [ 33.355579] ? syscall_return_slowpath+0x5c0/0x5c0 [ 33.360510] ? syscall_return_slowpath+0x30f/0x5c0 [ 33.365462] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 33.370842] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.375682] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.380855] RIP: 0033:0x43e958 [ 33.384036] RSP: 002b:00007fff84505988 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 33.391739] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e958 [ 33.399004] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 33.406286] RBP: 00000000004be300 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 33.413553] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 33.420813] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 33.428875] Dumping ftrace buffer: [ 33.432524] (ftrace buffer empty) [ 33.436229] Kernel Offset: disabled [ 33.439892] Rebooting in 86400 seconds..