[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.888437] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.063268] random: sshd: uninitialized urandom read (32 bytes read) [ 27.432895] random: sshd: uninitialized urandom read (32 bytes read) [ 28.202162] random: sshd: uninitialized urandom read (32 bytes read) [ 28.369348] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.53' (ECDSA) to the list of known hosts. [ 33.850471] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 33.940629] WARNING: CPU: 0 PID: 4497 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 33.949055] Kernel panic - not syncing: panic_on_warn set ... [ 33.949055] [ 33.956400] CPU: 0 PID: 4497 Comm: syz-executor190 Not tainted 4.17.0-rc4+ #49 [ 33.963735] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.973065] Call Trace: [ 33.975652] dump_stack+0x1b9/0x294 [ 33.979275] ? dump_stack_print_info.cold.2+0x52/0x52 [ 33.984450] ? smc_unhash_sk+0x250/0x4a0 [ 33.988491] panic+0x22f/0x4de [ 33.991661] ? add_taint.cold.5+0x16/0x16 [ 33.995790] ? __warn.cold.8+0x148/0x1b3 [ 33.999830] ? __warn.cold.8+0x117/0x1b3 [ 34.003871] ? smc_unhash_sk+0x345/0x4a0 [ 34.007909] __warn.cold.8+0x163/0x1b3 [ 34.011787] ? smc_unhash_sk+0x345/0x4a0 [ 34.015826] report_bug+0x252/0x2d0 [ 34.019434] do_error_trap+0x1de/0x490 [ 34.023310] ? graph_lock+0x170/0x170 [ 34.027095] ? math_error+0x420/0x420 [ 34.030879] ? lock_acquire+0x1dc/0x520 [ 34.034836] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.039657] do_invalid_op+0x1b/0x20 [ 34.043352] invalid_op+0x14/0x20 [ 34.046783] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 34.051425] RSP: 0018:ffff8801ac55f488 EFLAGS: 00010293 [ 34.056767] RAX: ffff8801af82a640 RBX: ffff8801ad45d7c0 RCX: ffffffff8740f43e [ 34.064013] RDX: 0000000000000000 RSI: ffffffff8740f4f5 RDI: 0000000000000005 [ 34.071260] RBP: ffff8801ac55f570 R08: ffff8801af82a640 R09: ffffed0035a8bb08 [ 34.078508] R10: ffffed0035a8bb08 R11: ffff8801ad45d843 R12: 1ffff100358abe95 [ 34.085755] R13: ffff8801ac55f548 R14: ffffffff8970da60 R15: ffff8801ad45d840 [ 34.093011] ? smc_unhash_sk+0x28e/0x4a0 [ 34.097063] ? smc_unhash_sk+0x345/0x4a0 [ 34.101107] ? smc_unhash_sk+0x345/0x4a0 [ 34.105148] ? smc_rx_data_available+0x100/0x100 [ 34.109884] ? release_sock+0x1e2/0x2b0 [ 34.113840] ? __local_bh_enable_ip+0x161/0x230 [ 34.118488] ? __release_sock+0x3a0/0x3a0 [ 34.122624] ? smc_release+0x269/0x610 [ 34.126494] ? trace_hardirqs_on+0xd/0x10 [ 34.130623] ? __local_bh_enable_ip+0x161/0x230 [ 34.135282] smc_release+0x36e/0x610 [ 34.138981] sock_release+0x96/0x1b0 [ 34.142674] ? sock_alloc_file+0x4e0/0x4e0 [ 34.146889] sock_close+0x16/0x20 [ 34.150327] __fput+0x34d/0x890 [ 34.153587] ? fput+0x1a0/0x1a0 [ 34.156850] ? _raw_spin_unlock_irq+0x27/0x70 [ 34.161326] ____fput+0x15/0x20 [ 34.164587] task_work_run+0x1e4/0x290 [ 34.168457] ? task_work_cancel+0x240/0x240 [ 34.172761] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 34.178276] ? switch_task_namespaces+0xa2/0xd0 [ 34.182927] do_exit+0x1aee/0x2730 [ 34.186449] ? mm_update_next_owner+0x980/0x980 [ 34.191095] ? lock_downgrade+0x8e0/0x8e0 [ 34.195220] ? noop_count+0x40/0x40 [ 34.198829] ? lock_pin_lock+0x350/0x350 [ 34.202885] ? kasan_check_read+0x11/0x20 [ 34.207013] ? rcu_is_watching+0x85/0x140 [ 34.211140] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 34.216316] ? is_bpf_text_address+0xd7/0x170 [ 34.220792] ? check_usage_backwards+0x151/0x3a0 [ 34.225526] ? graph_lock+0x170/0x170 [ 34.229306] ? graph_lock+0x170/0x170 [ 34.233099] ? find_held_lock+0x36/0x1c0 [ 34.237147] ? lock_downgrade+0x8e0/0x8e0 [ 34.241275] ? kasan_check_read+0x11/0x20 [ 34.245400] ? do_raw_spin_unlock+0x9e/0x2e0 [ 34.249785] ? __local_bh_enable_ip+0x161/0x230 [ 34.254433] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 34.259429] ? release_sock+0x1e2/0x2b0 [ 34.263378] ? trace_hardirqs_on+0xd/0x10 [ 34.267504] ? __local_bh_enable_ip+0x161/0x230 [ 34.272158] ? _raw_spin_unlock_bh+0x30/0x40 [ 34.276545] ? release_sock+0x1e2/0x2b0 [ 34.280497] ? __release_sock+0x3a0/0x3a0 [ 34.284623] ? __local_bh_enable_ip+0x161/0x230 [ 34.289286] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 34.294458] ? smc_setsockopt+0x1ed/0x6d0 [ 34.298587] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.304101] ? __sys_setsockopt+0x24f/0x390 [ 34.308407] do_group_exit+0x16f/0x430 [ 34.312286] ? mm_fault_error+0x380/0x380 [ 34.316413] ? __ia32_sys_exit+0x50/0x50 [ 34.320456] ? do_syscall_64+0x92/0x800 [ 34.324409] __x64_sys_exit_group+0x3e/0x50 [ 34.328712] do_syscall_64+0x1b1/0x800 [ 34.332581] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 34.337404] ? syscall_return_slowpath+0x5c0/0x5c0 [ 34.342332] ? syscall_return_slowpath+0x30f/0x5c0 [ 34.347246] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 34.352593] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.357421] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 34.362595] RIP: 0033:0x43e8d8 [ 34.365766] RSP: 002b:00007fff7106a5a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 34.373474] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 34.380734] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 34.387996] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 34.395253] R10: 0000000020000280 R11: 0000000000000246 R12: 0000000000000001 [ 34.402508] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 34.410363] Dumping ftrace buffer: [ 34.413979] (ftrace buffer empty) [ 34.417668] Kernel Offset: disabled [ 34.421279] Rebooting in 86400 seconds..