[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 23.318962] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.971054] random: sshd: uninitialized urandom read (32 bytes read) [ 28.305248] random: sshd: uninitialized urandom read (32 bytes read) [ 29.046248] random: sshd: uninitialized urandom read (32 bytes read) [ 29.200658] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.8' (ECDSA) to the list of known hosts. [ 34.625990] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 34.717014] WARNING: CPU: 1 PID: 4516 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 34.725430] Kernel panic - not syncing: panic_on_warn set ... [ 34.725430] [ 34.732774] CPU: 1 PID: 4516 Comm: syz-executor404 Not tainted 4.17.0-rc4+ #41 [ 34.740115] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.749446] Call Trace: [ 34.752018] dump_stack+0x1b9/0x294 [ 34.755632] ? dump_stack_print_info.cold.2+0x52/0x52 [ 34.760815] ? smc_unhash_sk+0x2d0/0x4a0 [ 34.764857] panic+0x22f/0x4de [ 34.768047] ? add_taint.cold.5+0x16/0x16 [ 34.772185] ? __warn.cold.8+0x148/0x1b3 [ 34.776230] ? __warn.cold.8+0x117/0x1b3 [ 34.780271] ? smc_unhash_sk+0x345/0x4a0 [ 34.784328] __warn.cold.8+0x163/0x1b3 [ 34.788203] ? smc_unhash_sk+0x345/0x4a0 [ 34.792243] report_bug+0x252/0x2d0 [ 34.795861] do_error_trap+0x1de/0x490 [ 34.799729] ? graph_lock+0x170/0x170 [ 34.803509] ? math_error+0x420/0x420 [ 34.807298] ? lock_acquire+0x1dc/0x520 [ 34.811256] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.816078] do_invalid_op+0x1b/0x20 [ 34.819770] invalid_op+0x14/0x20 [ 34.823202] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 34.827857] RSP: 0018:ffff8801ad69f488 EFLAGS: 00010293 [ 34.833200] RAX: ffff8801d95fa140 RBX: ffff8801ac5547c0 RCX: ffffffff87404cbe [ 34.840457] RDX: 0000000000000000 RSI: ffffffff87404d75 RDI: 0000000000000005 [ 34.847705] RBP: ffff8801ad69f570 R08: ffff8801d95fa140 R09: ffffed00358aa908 [ 34.854960] R10: ffffed00358aa908 R11: ffff8801ac554843 R12: 1ffff10035ad3e95 [ 34.862211] R13: ffff8801ad69f548 R14: ffffffff8970cc20 R15: ffff8801ac554840 [ 34.869471] ? smc_unhash_sk+0x28e/0x4a0 [ 34.873514] ? smc_unhash_sk+0x345/0x4a0 [ 34.877563] ? smc_unhash_sk+0x345/0x4a0 [ 34.881607] ? smc_rx_data_available+0x100/0x100 [ 34.886345] ? release_sock+0x1e2/0x2b0 [ 34.890301] ? __local_bh_enable_ip+0x161/0x230 [ 34.894947] ? __release_sock+0x3a0/0x3a0 [ 34.899075] ? smc_release+0x269/0x610 [ 34.902946] ? trace_hardirqs_on+0xd/0x10 [ 34.907081] ? __local_bh_enable_ip+0x161/0x230 [ 34.911729] smc_release+0x36e/0x610 [ 34.915425] sock_release+0x96/0x1b0 [ 34.919116] ? sock_alloc_file+0x4e0/0x4e0 [ 34.923327] sock_close+0x16/0x20 [ 34.926761] __fput+0x34d/0x890 [ 34.930033] ? fput+0x1a0/0x1a0 [ 34.933298] ? _raw_spin_unlock_irq+0x27/0x70 [ 34.937778] ____fput+0x15/0x20 [ 34.941057] task_work_run+0x1e4/0x290 [ 34.944943] ? task_work_cancel+0x240/0x240 [ 34.949245] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 34.954762] ? switch_task_namespaces+0xa2/0xd0 [ 34.959410] do_exit+0x1aee/0x2730 [ 34.962935] ? mm_update_next_owner+0x980/0x980 [ 34.967580] ? lock_downgrade+0x8e0/0x8e0 [ 34.971712] ? noop_count+0x40/0x40 [ 34.975322] ? lock_pin_lock+0x350/0x350 [ 34.979370] ? kasan_check_read+0x11/0x20 [ 34.983505] ? rcu_is_watching+0x85/0x140 [ 34.987639] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 34.992813] ? is_bpf_text_address+0xd7/0x170 [ 34.997292] ? check_usage_backwards+0x151/0x3a0 [ 35.002039] ? graph_lock+0x170/0x170 [ 35.005822] ? graph_lock+0x170/0x170 [ 35.009605] ? find_held_lock+0x36/0x1c0 [ 35.013650] ? lock_downgrade+0x8e0/0x8e0 [ 35.017779] ? kasan_check_read+0x11/0x20 [ 35.021907] ? do_raw_spin_unlock+0x9e/0x2e0 [ 35.026301] ? __local_bh_enable_ip+0x161/0x230 [ 35.030951] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 35.035945] ? release_sock+0x1e2/0x2b0 [ 35.039898] ? trace_hardirqs_on+0xd/0x10 [ 35.044031] ? __local_bh_enable_ip+0x161/0x230 [ 35.048685] ? _raw_spin_unlock_bh+0x30/0x40 [ 35.053079] ? release_sock+0x1e2/0x2b0 [ 35.057050] ? __release_sock+0x3a0/0x3a0 [ 35.061186] ? __local_bh_enable_ip+0x161/0x230 [ 35.065835] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 35.071003] ? smc_setsockopt+0x1ed/0x630 [ 35.075143] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.080660] ? __sys_setsockopt+0x24f/0x390 [ 35.084965] do_group_exit+0x16f/0x430 [ 35.088842] ? mm_fault_error+0x380/0x380 [ 35.092974] ? __ia32_sys_exit+0x50/0x50 [ 35.097039] ? do_syscall_64+0x92/0x800 [ 35.101009] __x64_sys_exit_group+0x3e/0x50 [ 35.105319] do_syscall_64+0x1b1/0x800 [ 35.109188] ? syscall_return_slowpath+0x5c0/0x5c0 [ 35.114096] ? syscall_return_slowpath+0x30f/0x5c0 [ 35.119010] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 35.124361] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.129186] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.134364] RIP: 0033:0x43e8c8 [ 35.137532] RSP: 002b:00007fff9db10148 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 35.145219] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8c8 [ 35.152471] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 35.159729] RBP: 00000000004be260 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 35.166978] R10: 0000000020001580 R11: 0000000000000246 R12: 0000000000000001 [ 35.174229] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 35.182117] Dumping ftrace buffer: [ 35.185729] (ftrace buffer empty) [ 35.189418] Kernel Offset: disabled [ 35.193026] Rebooting in 86400 seconds..