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On 2020-09-11T13:01:21+00:00 Florian Weimer wrote:

If the A and AAAA queries have equal transaction IDs, the initial AAAA
response is not recognized as valid, resulting in timeouts and
retransmits.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1961697/comments/0

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On 2020-09-11T13:02:20+00:00 Florian Weimer wrote:

This bug is distinct from bug 19691 in the sense that it is possible to
fix it without reworking the buffer management.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1961697/comments/1

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On 2020-09-11T13:05:49+00:00 Florian Weimer wrote:

Patch posted: https://sourceware.org/pipermail/libc-
alpha/2020-September/117547.html

Reply at:
https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1961697/comments/2

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On 2020-10-14T09:34:14+00:00 Cvs-commit wrote:

The master branch has been updated by Florian Weimer
<f...@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=f1f00c072138af90ae6da180f260111f09afe7a3

commit f1f00c072138af90ae6da180f260111f09afe7a3
Author: Florian Weimer <fwei...@redhat.com>
Date:   Wed Oct 14 10:54:39 2020 +0200

    resolv: Handle transaction ID collisions in parallel queries (bug 26600)
    
    If the transaction IDs are equal, the old check attributed both
    responses to the first query, not recognizing the second response.
    This fixes bug 26600.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1961697/comments/3

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On 2020-10-14T09:34:46+00:00 Florian Weimer wrote:

Fixed for glibc 2.33.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1961697/comments/4

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On 2020-11-10T16:00:06+00:00 Cvs-commit wrote:

The release/2.32/master branch has been updated by Florian Weimer
<f...@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=2dfa659a66f20facc4082207884c20e986ddecee

commit 2dfa659a66f20facc4082207884c20e986ddecee
Author: Florian Weimer <fwei...@redhat.com>
Date:   Wed Oct 14 10:54:39 2020 +0200

    resolv: Handle transaction ID collisions in parallel queries (bug 26600)
    
    If the transaction IDs are equal, the old check attributed both
    responses to the first query, not recognizing the second response.
    This fixes bug 26600.
    
    (cherry picked from commit f1f00c072138af90ae6da180f260111f09afe7a3)

Reply at:
https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1961697/comments/5


** Changed in: glibc
       Status: Unknown => Fix Released

** Changed in: glibc
   Importance: Unknown => Medium

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https://bugs.launchpad.net/bugs/1961697

Title:
  Transaction ID collisions cause slow DNS lookups in getaddrinfo

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