[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.076324] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.813432] random: sshd: uninitialized urandom read (32 bytes read) [ 23.315823] random: sshd: uninitialized urandom read (32 bytes read) [ 24.204393] random: sshd: uninitialized urandom read (32 bytes read) [ 24.363129] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.42' (ECDSA) to the list of known hosts. [ 29.796121] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.890933] ------------[ cut here ]------------ [ 29.890936] precision 59591 too large [ 29.890940] WARNING: CPU: 1 PID: 4508 at lib/vsprintf.c:2164 set_precision+0xc3/0xe0 [ 29.890943] Kernel panic - not syncing: panic_on_warn set ... [ 29.890944] [ 29.890948] CPU: 1 PID: 4508 Comm: syz-executor487 Not tainted 4.17.0+ #90 [ 29.890952] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.890954] Call Trace: [ 29.890956] dump_stack+0x1b9/0x294 [ 29.890959] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.890961] ? set_precision+0xb0/0xe0 [ 29.890963] panic+0x22f/0x4de [ 29.890965] ? add_taint.cold.5+0x16/0x16 [ 29.890968] ? __warn.cold.8+0x148/0x1b3 [ 29.890970] ? __warn.cold.8+0x117/0x1b3 [ 29.890972] ? set_precision+0xc3/0xe0 [ 29.890975] __warn.cold.8+0x163/0x1b3 [ 29.890977] ? set_precision+0xc3/0xe0 [ 29.890979] report_bug+0x252/0x2d0 [ 29.890981] do_error_trap+0x1fc/0x4d0 [ 29.890983] ? printk_safe_log_store+0x237/0x2d0 [ 29.890986] ? math_error+0x3f0/0x3f0 [ 29.890988] ? printk_deferred+0xc6/0xc6 [ 29.890990] ? vprintk_func+0xd0/0xe7 [ 29.890992] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 29.890995] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.890997] do_invalid_op+0x1b/0x20 [ 29.890999] invalid_op+0x14/0x20 [ 29.891002] RIP: 0010:set_precision+0xc3/0xe0 [ 29.891004] Code: fc ff df 80 3c 02 00 75 32 66 41 89 5d 06 eb 9d e8 62 c9 fb f9 89 de 48 c7 c7 40 5c 86 88 c6 05 49 a1 1a 02 01 e8 ad e0 c7 f9 <0f> 0b eb a7 4c 89 ef e8 51 bd 38 fa e9 5a ff ff ff 4c 89 ef e8 44 [ 29.891093] RSP: 0018:ffff8801b47776d8 EFLAGS: 00010086 [ 29.891098] RAX: 0000000000000019 RBX: 000000000000e8c7 RCX: ffffffff81854ea8 [ 29.891101] RDX: 0000000000000000 RSI: ffffffff8161f530 RDI: 0000000000000001 [ 29.891104] RBP: ffff8801b47776f0 R08: ffff8801b3b04580 R09: ffffed003b5e42cd [ 29.891108] R10: ffffed003b5e42cd R11: ffff8801daf2166f R12: 0000000000000000 [ 29.891111] R13: ffff8801b4777768 R14: ffffffff8884212e R15: ffff8801b47777a8 [ 29.891113] ? irq_work_queue+0x28/0x130 [ 29.891116] ? vprintk_func+0xd0/0xe7 [ 29.891118] ? set_precision+0xc3/0xe0 [ 29.891120] vsnprintf+0x3b3/0x1b40 [ 29.891122] ? pointer+0x930/0x930 [ 29.891125] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.891127] ? search_nested_keyrings+0x608/0x11d0 [ 29.891130] ? kasan_check_write+0x14/0x20 [ 29.891132] vscnprintf+0x2d/0x80 [ 29.891134] vprintk_emit+0x1a3/0xde0 [ 29.891136] ? wake_up_klogd+0x100/0x100 [ 29.891138] ? retint_kernel+0x10/0x10 [ 29.891141] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.891144] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 29.891146] ? retint_kernel+0x10/0x10 [ 29.891148] vprintk_default+0x28/0x30 [ 29.891150] vprintk_func+0x7a/0xe7 [ 29.891152] printk+0x9e/0xba [ 29.891154] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 29.891157] dns_resolver_preparse.cold.3+0x71/0x252 [ 29.891160] ? dns_resolver_free_preparse+0x40/0x40 [ 29.891162] ? security_key_permission+0x94/0xc0 [ 29.891165] ? dns_resolver_free_preparse+0x40/0x40 [ 29.891167] key_create_or_update+0x569/0x1100 [ 29.891170] ? key_type_lookup+0xd0/0xd0 [ 29.891172] ? join_session_keyring+0x340/0x340 [ 29.891174] ? lock_release+0xa10/0xa10 [ 29.891177] ? check_same_owner+0x320/0x320 [ 29.891179] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 29.891182] ? __check_object_size+0x95/0x5d9 [ 29.891185] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 29.891187] ? _copy_from_user+0xdf/0x150 [ 29.891189] __x64_sys_add_key+0x3cf/0x4e0 [ 29.891192] ? key_get_type_from_user.constprop.7+0x110/0x110 [ 29.891194] ? do_syscall_64+0x92/0x800 [ 29.891196] do_syscall_64+0x1b1/0x800 [ 29.891199] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 29.891202] ? syscall_return_slowpath+0x5c0/0x5c0 [ 29.891204] ? syscall_return_slowpath+0x30f/0x5c0 [ 29.891207] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 29.891209] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.891212] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 29.891214] RIP: 0033:0x43fdb9 [ 29.891215] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 6b 45 00 00 c3 66 2e 0f 1f 84 00 00 00 00 [ 29.891294] RSP: 002b:00007fffa61cd5d8 EFLAGS: 00000286 ORIG_RAX: 00000000000000f8 [ 29.891300] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdb9 [ 29.891304] RDX: 0000000020002200 RSI: 0000000020000080 RDI: 0000000020000100 [ 29.891307] RBP: 00000000006ca018 R08: 0000000021b452aa R09: 00000000004002c8 [ 29.891311] R10: 000000000000e9da R11: 0000000000000286 R12: 00000000004016e0 [ 29.891314] R13: 0000000000401770 R14: 0000000000000000 R15: 0000000000000000 [ 29.891316] Dumping ftrace buffer: [ 29.891318] (ftrace buffer empty) [ 29.891321] Kernel Offset: disabled