------------[ cut here ]------------
WARNING: CPU: 0 PID: 6520 at lib/vsprintf.c:1941 set_precision+0x144/0x170 lib/vsprintf.c:1941
precision 1048537 too large[   46.626611] Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 6520 Comm: syz-executor4 Not tainted 4.9.97-g2bcbbd5 #14
netlink: 3 bytes leftover after parsing attributes in process `syz-executor6'.
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801cb7376d0 ffffffff81eb0b69 ffffffff83c484a0 00000000ffffffff
 0000000000000000 0000000000000000 0000000000000795 ffff8801cb737790
 ffffffff8141f975 0000000041b58ab3 ffffffff843b8408 ffffffff8141f7b6
Call Trace:
 [<ffffffff81eb0b69>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb0b69>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8141f975>] panic+0x1bf/0x3bc kernel/panic.c:179
 [<ffffffff8141fc61>] __warn.cold.9+0xc1/0x17f kernel/panic.c:542
 [<ffffffff811344b2>] warn_slowpath_fmt+0xc2/0x100 kernel/panic.c:565
 [<ffffffff81ed20e4>] set_precision+0x144/0x170 lib/vsprintf.c:1941
 [<ffffffff81edbffe>] vsnprintf+0x31e/0x1840 lib/vsprintf.c:2017
 [<ffffffff81edd54d>] vscnprintf+0x2d/0x60 lib/vsprintf.c:2147
 [<ffffffff8125d484>] vprintk_emit+0xf4/0x790 kernel/printk/printk.c:1847
 [<ffffffff8125db48>] vprintk+0x28/0x30 kernel/printk/printk.c:1913
 [<ffffffff8125db6d>] vprintk_default+0x1d/0x30 kernel/printk/printk.c:1914
 [<ffffffff8142aab5>] vprintk_func kernel/printk/internal.h:36 [inline]
 [<ffffffff8142aab5>] printk+0xaf/0xd7 kernel/printk/printk.c:1975
 [<ffffffff839dc8c9>] dns_resolver_preparse.cold.3+0x71/0x240 net/dns_resolver/dns_key.c:131
 [<ffffffff81ccf9fb>] key_create_or_update+0x35b/0xac0 security/keys/key.c:855
 [<ffffffff81cd4874>] SYSC_add_key security/keys/keyctl.c:125 [inline]
 [<ffffffff81cd4874>] SyS_add_key+0x1b4/0x390 security/keys/keyctl.c:60
 [<ffffffff81006da7>] do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline]
 [<ffffffff81006da7>] do_fast_syscall_32+0x2f7/0x870 arch/x86/entry/common.c:387
 [<ffffffff839f5d50>] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..