------------[ cut here ]------------
WARNING: CPU: 0 PID: 8407 at lib/vsprintf.c:1938 set_precision+0x144/0x170 lib/vsprintf.c:1938
precision 1047874 too large[  516.142300] Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 8407 Comm: syz-executor6 Not tainted 4.9.113-g90e7a90 #68
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
netlink: 8 bytes leftover after parsing attributes in process `syz-executor0'.
 ffff8801a5b5f6e0 ffffffff81eb4569 ffffffff83c48980 00000000ffffffff
 0000000000000000
 0000000000000000 0000000000000792 ffff8801a5b5f7a0 ffffffff81421a55
 0000000041b58ab3 ffffffff843bbec8 ffffffff81421896Call Trace:
 [<ffffffff81eb4569>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb4569>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81421a55>] panic+0x1bf/0x3bc kernel/panic.c:179
 [<ffffffff81421d41>] __warn.cold.9+0xc1/0x17f kernel/panic.c:542
 [<ffffffff811366e2>] warn_slowpath_fmt+0xc2/0x100 kernel/panic.c:565
 [<ffffffff81ed5ab4>] set_precision+0x144/0x170 lib/vsprintf.c:1938
 [<ffffffff81edf9ce>] vsnprintf+0x31e/0x1840 lib/vsprintf.c:2014
 [<ffffffff81ee0f1d>] vscnprintf+0x2d/0x60 lib/vsprintf.c:2144
 [<ffffffff8125f2d4>] vprintk_emit+0xf4/0x790 kernel/printk/printk.c:1847
 [<ffffffff8125f998>] vprintk+0x28/0x30 kernel/printk/printk.c:1913
 [<ffffffff8125f9bd>] vprintk_default+0x1d/0x30 kernel/printk/printk.c:1914
 [<ffffffff8142cbbc>] vprintk_func kernel/printk/internal.h:36 [inline]
 [<ffffffff8142cbbc>] printk+0xaf/0xd7 kernel/printk/printk.c:1975
 [<ffffffff839e340b>] dns_resolver_preparse.cold.3+0x71/0x240 net/dns_resolver/dns_key.c:131
 [<ffffffff81cd32ab>] key_create_or_update+0x35b/0xac0 security/keys/key.c:855
 [<ffffffff81cd8124>] SYSC_add_key security/keys/keyctl.c:125 [inline]
 [<ffffffff81cd8124>] SyS_add_key+0x1b4/0x390 security/keys/keyctl.c:60
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839fb193>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..