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commit 513a71a420e74270a6a9702ec916e807be51350a
Author: Florian Weimer <fweimer@redhat.com>
Date:   Sat Jun 24 16:51:31 2017 +0200

    resolv/tst-resolv-basic: Add test cases for bug 21295

diff --git a/resolv/tst-resolv-basic.c b/resolv/tst-resolv-basic.c
index 66a0e8a1659219b4..95aea1bcfb266017 100644
--- a/resolv/tst-resolv-basic.c
+++ b/resolv/tst-resolv-basic.c
@@ -495,6 +495,22 @@ do_test (void)
   test_bug_21295 ();
   test_nodata_nxdomain ();
 
+  /* Test for bug 21295.  */
+  check_ai_hints ("www.example", "80",
+                  (struct addrinfo) { .ai_family = AF_INET6,
+                      .ai_socktype = SOCK_STREAM,
+                      .ai_flags = AI_V4MAPPED | AI_ALL, },
+                  "flags: AI_V4MAPPED AI_ALL\n"
+                  "address: STREAM/TCP 2001:db8::1 80\n"
+                  "address: STREAM/TCP ::ffff:192.0.2.17 80\n");
+  check_ai_hints ("t.www.example", "80",
+                  (struct addrinfo) { .ai_family = AF_INET6,
+                      .ai_socktype = SOCK_STREAM,
+                      .ai_flags = AI_V4MAPPED | AI_ALL, },
+                  "flags: AI_V4MAPPED AI_ALL\n"
+                  "address: STREAM/TCP 2001:db8::3 80\n"
+                  "address: STREAM/TCP ::ffff:192.0.2.19 80\n");
+
   resolv_test_end (aux);
 
   return 0;