'servfail' exception occurs after BIND runs for a period of time, restart bind ：servfail does not appear
but，After running for some time, it still had the same 'servfail' problem #./sbin/named -VBIND 9.11.5 (Extended Support Version) <id:3b0b204>running on Linux x86_64 3.10.0-514.26.2.el7.x86_64 #1 SMP Tue Jul 4 15:04:05 UTC 2017built by make with '--prefix=/home/bind/' '--enable-filter-aaaa' '--with-tuning=large' '--enable-largefile' '--enable-threads'compiled by GCC 4.8.5 20150623 (Red Hat 4.8.5-28)compiled with OpenSSL version: OpenSSL 1.0.2k 26 Jan 2017linked to OpenSSL version: OpenSSL 1.0.2k-fips 26 Jan 2017compiled with zlib version: 1.2.7linked to zlib version: 1.2.7threads support is enabled
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