JVM报错：C [libresolv.so.2+0x7a91] __libc_res_nquery+0x1c1

部署公司内网服务时，启动tomcat出现错误： 

#
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x00007f8c6dc58a91, pid=26369, tid=140241293625088
#
# JRE version: Java(TM) SE Runtime Environment (7.0_80-b15) (build 1.7.0_80-b15)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (24.80-b11 mixed mode linux-amd64 compressed oops)
# Problematic frame:
# C  [libresolv.so.2+0x7a91]  __libc_res_nquery+0x1c1
#
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
# An error report file with more information is saved as:
# /home/portal/portal-2.0/cas-server/bin/hs_err_pid26369.log
#
# If you would like to submit a bug report, please visit:
#   http://bugreport.java.com/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#

空起tomcat是正常的，加入应用war包启动失败，应用war包中涉及到连接公网数据库，起初测试该地址是通过ping和telnet命令，测试正常；随后加入自己的war包，可以启动，自己war包未涉及该公网数据库，由此猜测为该问题导致。看到一篇报C [libresolv.so.2+0x7a91] __libc_res_nquery+0x1c1的错误，文章说是由DNS导致，起初认为，应用中指定了IP，并未使用域名，应该不属于域名问题。

但事实证明，配置机器的网卡的DNS（我配置的是180.76.76.76）解决了该问题。

导致该问题的具体原因，目前还未查清，欢迎知道的大神在评论区指出。