syzbot

random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
------------[ cut here ]------------
precision 1047878 too large
WARNING: CPU: 1 PID: 4583 at lib/vsprintf.c:2164 set_precision+0xc3/0xe0 lib/vsprintf.c:2164
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 4583 Comm: syz-executor016 Not tainted 4.18.0-rc4+ #148
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
 panic+0x238/0x4e7 kernel/panic.c:184
 __warn.cold.8+0x163/0x1ba kernel/panic.c:536
 report_bug+0x252/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992
RIP: 0010:set_precision+0xc3/0xe0 lib/vsprintf.c:2164
Code: fc ff df 80 3c 02 00 75 32 66 41 89 5d 06 eb 9d e8 c2 d0 eb f9 89 de 48 c7 c7 20 76 86 88 c6 05 3e 8c 09 02 01 e8 fd f3 b6 f9 <0f> 0b eb a7 4c 89 ef e8 61 b0 29 fa e9 5a ff ff ff 4c 89 ef e8 54 
RSP: 0018:ffff8801ac04f6d8 EFLAGS: 00010086
RAX: 0000000000000000 RBX: 00000000000ffd46 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81631870 RDI: 0000000000000001
RBP: ffff8801ac04f6f0 R08: ffff8801ac682740 R09: ffffed003b5e42cd
R10: ffffed003b5e42cd R11: ffff8801daf2166f R12: 0000000000000000
R13: ffff8801ac04f768 R14: ffffffff888445ae R15: ffff8801ac04f7a8
 vsnprintf+0x38b/0x1b60 lib/vsprintf.c:2240
 vscnprintf+0x2d/0x80 lib/vsprintf.c:2370
 vprintk_emit+0x1ab/0xdf0 kernel/printk/printk.c:1853
 vprintk_default+0x28/0x30 kernel/printk/printk.c:1948
 vprintk_func+0x7a/0xe7 kernel/printk/printk_safe.c:382
 printk+0xa7/0xcf kernel/printk/printk.c:1981
 dns_resolver_preparse.cold.3+0x1fd/0x252 net/dns_resolver/dns_key.c:130
 key_create_or_update+0x583/0x1120 security/keys/key.c:849
 __do_sys_add_key security/keys/keyctl.c:122 [inline]
 __se_sys_add_key security/keys/keyctl.c:62 [inline]
 __x64_sys_add_key+0x3cf/0x4e0 security/keys/keyctl.c:62
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x440099
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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007ffc76319808 EFLAGS: 00000286 ORIG_RAX: 00000000000000f8
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440099
RDX: 00000000200000c0 RSI: 0000000020000000 RDI: 0000000020000080
RBP: 00000000006ca018 R08: 00000000fffffffb R09: 00000000004002c8
R10: 00000000000fffff R11: 0000000000000286 R12: 0000000000401920
R13: 00000000004019b0 R14: 0000000000000000 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled