[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.506340] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.940436] random: sshd: uninitialized urandom read (32 bytes read) [ 23.301503] random: sshd: uninitialized urandom read (32 bytes read) [ 24.017256] random: sshd: uninitialized urandom read (32 bytes read) [ 28.419839] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.1' (ECDSA) to the list of known hosts. [ 33.903948] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 33.994949] WARNING: CPU: 1 PID: 4524 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 34.003333] Kernel panic - not syncing: panic_on_warn set ... [ 34.003333] [ 34.010685] CPU: 1 PID: 4524 Comm: syz-executor662 Not tainted 4.17.0-rc3+ #33 [ 34.018032] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.027380] Call Trace: [ 34.029967] dump_stack+0x1b9/0x294 [ 34.033576] ? dump_stack_print_info.cold.2+0x52/0x52 [ 34.038751] ? smc_unhash_sk+0x270/0x4a0 [ 34.042791] panic+0x22f/0x4de [ 34.045961] ? add_taint.cold.5+0x16/0x16 [ 34.050093] ? __warn.cold.8+0x148/0x1b3 [ 34.054137] ? __warn.cold.8+0x117/0x1b3 [ 34.058185] ? smc_unhash_sk+0x345/0x4a0 [ 34.062232] __warn.cold.8+0x163/0x1b3 [ 34.066100] ? smc_unhash_sk+0x345/0x4a0 [ 34.070143] report_bug+0x252/0x2d0 [ 34.073752] do_error_trap+0x1de/0x490 [ 34.077618] ? graph_lock+0x170/0x170 [ 34.081402] ? math_error+0x420/0x420 [ 34.085185] ? lock_acquire+0x1dc/0x520 [ 34.089143] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.093968] do_invalid_op+0x1b/0x20 [ 34.097665] invalid_op+0x14/0x20 [ 34.101096] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 34.105738] RSP: 0018:ffff8801acb1f488 EFLAGS: 00010293 [ 34.111083] RAX: ffff8801b149e6c0 RBX: ffff8801b1af07c0 RCX: ffffffff873fe71e [ 34.118347] RDX: 0000000000000000 RSI: ffffffff873fe7d5 RDI: 0000000000000005 [ 34.125597] RBP: ffff8801acb1f570 R08: ffff8801b149e6c0 R09: ffffed003635e108 [ 34.132845] R10: ffffed003635e108 R11: ffff8801b1af0843 R12: 1ffff10035963e95 [ 34.140097] R13: ffff8801acb1f548 R14: ffffffff8970e4e0 R15: ffff8801b1af0840 [ 34.147360] ? smc_unhash_sk+0x28e/0x4a0 [ 34.151403] ? smc_unhash_sk+0x345/0x4a0 [ 34.155445] ? smc_unhash_sk+0x345/0x4a0 [ 34.159486] ? smc_rx_data_available+0x100/0x100 [ 34.164222] ? release_sock+0x1e2/0x2b0 [ 34.168176] ? __local_bh_enable_ip+0x161/0x230 [ 34.172826] ? __release_sock+0x3a0/0x3a0 [ 34.176960] ? smc_release+0x269/0x610 [ 34.180826] ? trace_hardirqs_on+0xd/0x10 [ 34.184955] ? __local_bh_enable_ip+0x161/0x230 [ 34.189606] smc_release+0x36e/0x610 [ 34.193307] sock_release+0x96/0x1b0 [ 34.197004] ? sock_alloc_file+0x4e0/0x4e0 [ 34.201228] sock_close+0x16/0x20 [ 34.204669] __fput+0x34d/0x890 [ 34.207931] ? fput+0x1a0/0x1a0 [ 34.211194] ? _raw_spin_unlock_irq+0x27/0x70 [ 34.215671] ____fput+0x15/0x20 [ 34.218933] task_work_run+0x1e4/0x290 [ 34.222803] ? task_work_cancel+0x240/0x240 [ 34.227120] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 34.232645] ? switch_task_namespaces+0xa2/0xd0 [ 34.237302] do_exit+0x1aee/0x2730 [ 34.240823] ? mm_update_next_owner+0x980/0x980 [ 34.245474] ? lock_downgrade+0x8e0/0x8e0 [ 34.249600] ? noop_count+0x40/0x40 [ 34.253233] ? lock_pin_lock+0x350/0x350 [ 34.257291] ? kasan_check_read+0x11/0x20 [ 34.261421] ? rcu_is_watching+0x85/0x140 [ 34.265550] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 34.270726] ? is_bpf_text_address+0xd7/0x170 [ 34.275204] ? check_usage_backwards+0x151/0x3a0 [ 34.279938] ? graph_lock+0x170/0x170 [ 34.283717] ? graph_lock+0x170/0x170 [ 34.287523] ? find_held_lock+0x36/0x1c0 [ 34.291570] ? lock_downgrade+0x8e0/0x8e0 [ 34.295703] ? kasan_check_read+0x11/0x20 [ 34.299829] ? do_raw_spin_unlock+0x9e/0x2e0 [ 34.304229] ? __local_bh_enable_ip+0x161/0x230 [ 34.308881] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 34.313878] ? release_sock+0x1e2/0x2b0 [ 34.317832] ? trace_hardirqs_on+0xd/0x10 [ 34.321960] ? __local_bh_enable_ip+0x161/0x230 [ 34.326608] ? _raw_spin_unlock_bh+0x30/0x40 [ 34.331009] ? release_sock+0x1e2/0x2b0 [ 34.334969] ? __release_sock+0x3a0/0x3a0 [ 34.339098] ? __local_bh_enable_ip+0x161/0x230 [ 34.343749] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 34.348922] ? smc_setsockopt+0x1ed/0x630 [ 34.353053] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.358570] ? __sys_setsockopt+0x24f/0x390 [ 34.362874] do_group_exit+0x16f/0x430 [ 34.366742] ? mm_fault_error+0x380/0x380 [ 34.370872] ? __ia32_sys_exit+0x50/0x50 [ 34.374916] ? do_syscall_64+0x92/0x800 [ 34.378871] __x64_sys_exit_group+0x3e/0x50 [ 34.383180] do_syscall_64+0x1b1/0x800 [ 34.387047] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 34.391874] ? syscall_return_slowpath+0x5c0/0x5c0 [ 34.396787] ? syscall_return_slowpath+0x30f/0x5c0 [ 34.401699] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 34.407046] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.411876] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 34.417047] RIP: 0033:0x43e8c8 [ 34.420215] RSP: 002b:00007fff6af064b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 34.427905] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8c8 [ 34.435154] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 34.442404] RBP: 00000000004be260 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 34.449652] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 34.456900] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 34.464722] Dumping ftrace buffer: [ 34.468354] (ftrace buffer empty) [ 34.472042] Kernel Offset: disabled [ 34.475649] Rebooting in 86400 seconds..