[bug #56390] Fetches (e.g. HTTP) fail from dual-stacked hosts

[Faidon Liambotis]

URL:
  <https://savannah.gnu.org/bugs/?56390>

                 Summary: Fetches (e.g. HTTP) fail from dual-stacked hosts
                 Project: GNU GRUB
            Submitted by: paravoid
            Submitted on: Sun 26 May 2019 02:02:36 AM UTC
                Category: Network
                Severity: Major
                Priority: 5 - Normal
              Item Group: Software Error
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 
                 Release: Git master
         Reproducibility: Every Time
         Planned Release: None

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Details:

Assuming:
- GRUB has an IPv4 or IPv6 address (but not both)
- We want to fetch something from example.org (e.g. (http,example.org)/linux)
- example.org is dual-stacked, i.e. has both A and AAAA DNS records

One every N fetches will fail, at random.

Easily reproducible using nslookup, where it returns either the A or the AAAA,
basically at random:

grub> net_nslookup example.org
93.184.216.34
grub> net_nslookup example.org
93.184.216.34
grub> net_nslookup example.org
2606:2800:220:1:248:1893:25c8:1946
grub> net_nslookup example.org
93.184.216.34
grub> net_nslookup example.org
2606:2800:220:1:248:1893:25c8:1946
grub> net_nslookup example.org
93.184.216.34






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