[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.845985] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.632517] random: sshd: uninitialized urandom read (32 bytes read) [ 24.942802] random: sshd: uninitialized urandom read (32 bytes read) [ 25.823906] random: sshd: uninitialized urandom read (32 bytes read) [ 26.008505] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.20' (ECDSA) to the list of known hosts. [ 31.487915] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.585884] ------------[ cut here ]------------ [ 31.585887] precision 59591 too large [ 31.585892] WARNING: CPU: 1 PID: 4518 at lib/vsprintf.c:2164 set_precision+0xc3/0xe0 [ 31.585895] Kernel panic - not syncing: panic_on_warn set ... [ 31.585896] [ 31.585900] CPU: 1 PID: 4518 Comm: syz-executor124 Not tainted 4.17.0+ #92 [ 31.585904] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.585906] Call Trace: [ 31.585908] dump_stack+0x1b9/0x294 [ 31.585911] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.585913] ? set_precision+0xb0/0xe0 [ 31.585915] panic+0x22f/0x4de [ 31.585917] ? add_taint.cold.5+0x16/0x16 [ 31.585919] ? __warn.cold.8+0x148/0x1b3 [ 31.585921] ? __warn.cold.8+0x117/0x1b3 [ 31.585924] ? set_precision+0xc3/0xe0 [ 31.585926] __warn.cold.8+0x163/0x1b3 [ 31.585928] ? set_precision+0xc3/0xe0 [ 31.585930] report_bug+0x252/0x2d0 [ 31.585932] do_error_trap+0x1fc/0x4d0 [ 31.585935] ? printk_safe_log_store+0x237/0x2d0 [ 31.585937] ? math_error+0x3f0/0x3f0 [ 31.585939] ? printk_deferred+0xc6/0xc6 [ 31.585941] ? vprintk_func+0xd0/0xe7 [ 31.585944] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 31.585946] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.585948] do_invalid_op+0x1b/0x20 [ 31.585950] invalid_op+0x14/0x20 [ 31.585953] RIP: 0010:set_precision+0xc3/0xe0 [ 31.585954] Code: fc ff df 80 3c 02 00 75 32 66 41 89 5d 06 eb 9d e8 62 89 fb f9 89 de 48 c7 c7 40 63 86 88 c6 05 ca 65 1a 02 01 e8 ad a0 c7 f9 <0f> 0b eb a7 4c 89 ef e8 61 7d 38 fa e9 5a ff ff ff 4c 89 ef e8 54 [ 31.586050] RSP: 0018:ffff8801cf1276d8 EFLAGS: 00010086 [ 31.586057] RAX: 0000000000000019 RBX: 000000000000e8c7 RCX: ffffffff81854ea8 [ 31.586062] RDX: 0000000000000000 RSI: ffffffff8161f530 RDI: 0000000000000001 [ 31.586065] RBP: ffff8801cf1276f0 R08: ffff8801b62e4780 R09: ffffed003b5e42cd [ 31.586069] R10: ffffed003b5e42cd R11: ffff8801daf2166f R12: 0000000000000000 [ 31.586072] R13: ffff8801cf127768 R14: ffffffff8884282e R15: ffff8801cf1277a8 [ 31.586074] ? irq_work_queue+0x28/0x130 [ 31.586077] ? vprintk_func+0xd0/0xe7 [ 31.586079] ? set_precision+0xc3/0xe0 [ 31.586081] vsnprintf+0x3b3/0x1b40 [ 31.586083] ? pointer+0x930/0x930 [ 31.586086] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.586089] ? search_nested_keyrings+0x608/0x11d0 [ 31.586091] ? kasan_check_write+0x14/0x20 [ 31.586093] vscnprintf+0x2d/0x80 [ 31.586095] vprintk_emit+0x1a3/0xde0 [ 31.586098] ? wake_up_klogd+0x100/0x100 [ 31.586100] ? retint_kernel+0x10/0x10 [ 31.586102] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.586105] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 31.586107] ? retint_kernel+0x10/0x10 [ 31.586109] vprintk_default+0x28/0x30 [ 31.586111] vprintk_func+0x7a/0xe7 [ 31.586113] printk+0x9e/0xba [ 31.586116] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 31.586118] dns_resolver_preparse.cold.3+0x71/0x252 [ 31.586121] ? dns_resolver_free_preparse+0x40/0x40 [ 31.586123] ? security_key_permission+0x94/0xc0 [ 31.586126] ? dns_resolver_free_preparse+0x40/0x40 [ 31.586128] key_create_or_update+0x569/0x1100 [ 31.586130] ? key_type_lookup+0xd0/0xd0 [ 31.586133] ? join_session_keyring+0x340/0x340 [ 31.586135] ? lock_release+0xa10/0xa10 [ 31.586137] ? check_same_owner+0x320/0x320 [ 31.586140] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 31.586143] ? __check_object_size+0x95/0x5d9 [ 31.586145] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.586148] ? _copy_from_user+0xdf/0x150 [ 31.586150] __x64_sys_add_key+0x3cf/0x4e0 [ 31.586153] ? key_get_type_from_user.constprop.7+0x110/0x110 [ 31.586155] ? do_syscall_64+0x92/0x800 [ 31.586157] do_syscall_64+0x1b1/0x800 [ 31.586160] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 31.586162] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.586165] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.586167] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.586170] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.586172] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.586174] RIP: 0033:0x43fdb9 [ 31.586176] 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 [ 31.586258] RSP: 002b:00007fff05bfdf28 EFLAGS: 00000286 ORIG_RAX: 00000000000000f8 [ 31.586264] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdb9 [ 31.586267] RDX: 0000000020002200 RSI: 0000000020000080 RDI: 0000000020000100 [ 31.586271] RBP: 00000000006ca018 R08: 0000000034e0c864 R09: 00000000004002c8 [ 31.586274] R10: 000000000000e9da R11: 0000000000000286 R12: 00000000004016e0 [ 31.586278] R13: 0000000000401770 R14: 0000000000000000 R15: 0000000000000000 [ 31.586280] Dumping ftrace buffer: [ 31.586282] (ftrace buffer empty) [ 31.586284] Kernel Offset: disabled