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From: "bugs at jth dot net" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug libc/26977] New: getaddrinfo does not handle the hosts file
 correctly
Date: Sun, 29 Nov 2020 21:28:06 +0000
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X-Bugzilla-Product: glibc
X-Bugzilla-Component: libc
X-Bugzilla-Version: 2.32
X-Bugzilla-Keywords: glibc_2.32
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X-Bugzilla-Who: bugs at jth dot net
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P2
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D26977

            Bug ID: 26977
           Summary: getaddrinfo does not handle the hosts file correctly
           Product: glibc
           Version: 2.32
            Status: UNCONFIRMED
          Keywords: glibc_2.32
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: bugs at jth dot net
                CC: drepper.fsp at gmail dot com
  Target Milestone: 2.32

Host: Linux Fedora 33
On a dual stack IP4 + IP6 server the 2.32 release has introduced a problem =
of
getaddrinfo omitting looking up the IP6 address in the DNS in case the IP4
address is found in the hosts file or vice versa.

After upgrading 'ping -6 IP6.HOST' suddenly failed by "Address family for
hostname not supported" and the monitoring software reported downtime.
Similarly for the dig command.
A test program for getaddrinfo verified the changed behaviour.=20

Only after entering the IP6 address into or deleting the IP4 address from t=
he
hosts file the old behaviour was restored.

--=20
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