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Description of problem: getent ahostsv4 www.google.com 216.58.213.132 STREAM www.google.com 216.58.213.132 DGRAM 216.58.213.132 RAW (null) STREAM (null) DGRAM (null) RAW Version-Release number of selected component (if applicable): glibc-2.17-106.el7_2.4.x86_64 How reproducible: mostly Steps to Reproduce: 1. ensure upstream nameserver does not have cached result. 2. systemctl stop nscd ; rm -f /var/db/nscd/hosts ; nscd -i hosts ; systemctl start nscd 3. getent ahostsv4 www.google.com Actual results: getent ahostsv4 www.google.com 216.58.213.132 STREAM www.google.com 216.58.213.132 DGRAM 216.58.213.132 RAW (null) STREAM (null) DGRAM (null) RAW or a multiple response 64.15.112.44 STREAM www.google.com 64.15.112.44 DGRAM 64.15.112.44 RAW 64.15.112.55 STREAM 64.15.112.55 DGRAM 64.15.112.55 RAW 64.15.112.40 STREAM 64.15.112.40 DGRAM 64.15.112.40 RAW 64.15.112.25 STREAM 64.15.112.25 DGRAM 64.15.112.25 RAW 64.15.112.49 STREAM 64.15.112.49 DGRAM 64.15.112.49 RAW 64.15.112.50 STREAM 64.15.112.50 DGRAM 64.15.112.50 RAW 64.15.112.39 STREAM 64.15.112.39 DGRAM 64.15.112.39 RAW 64.15.112.24 STREAM 64.15.112.24 DGRAM 64.15.112.24 RAW 64.15.112.34 STREAM 64.15.112.34 DGRAM 64.15.112.34 RAW 64.15.112.59 STREAM 64.15.112.59 DGRAM 64.15.112.59 RAW 64.15.112.54 STREAM 64.15.112.54 DGRAM 64.15.112.54 RAW 64.15.112.30 STREAM 64.15.112.30 DGRAM 64.15.112.30 RAW 64.15.112.45 STREAM 64.15.112.45 DGRAM 64.15.112.45 RAW 64.15.112.35 STREAM 64.15.112.35 DGRAM 64.15.112.35 RAW 64.15.112.29 STREAM 64.15.112.29 DGRAM 64.15.112.29 RAW 64.15.112.20 STREAM 64.15.112.20 DGRAM 64.15.112.20 RAW (null) STREAM (null) DGRAM (null) RAW Expected results: getent ahostsv4 www.google.com 216.58.213.132 STREAM www.google.com 216.58.213.132 DGRAM 216.58.213.132 RAW Additional info: A hack of the getent source indicates that the call to inet_ntop is failing (return code not checked), printing the error gives inet_ntop FAILED 97/Address family not supported by protocol where the address family is some garbage value. Capturing the DNS traffic confirms that there is only the normal A & AAAA queries with valid replies.
Created attachment 1144266 [details] dns capture
Created attachment 1144267 [details] copy of hosts db after bad lookup
*** Bug 1339925 has been marked as a duplicate of this bug. ***
Any news on a target release ?
(In reply to Thomas Oulevey from comment #17) > Any news on a target release ? The intent is to fix this for the upcoming RHEL 7.4. This is not a guarantee though. Thank you for your patience.
These unsupported and untested glibc preview builds contain a fix for this issue: https://copr.fedorainfracloud.org/coprs/fweimer/glibc-rhel-7.4/
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2017:1916