tailscale / tailscale/tailcat

New Android error after latest commits

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Dominant language
Go
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Description

Hi guys, after some trial and error, I was able to compile the latest code to arm v7 binary (which is what I need for my android device) and running tailscale gives me the following error:

2026/09/19 04:34:10 Expand: fetching DERPMap for region -1: Get "https://tailcat.dev/derpmap.json": dial tcp: lookup tailcat.dev on [::1]:53: androiddns: bogus answer length 1131375981

Any ideas?

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

No files or tests are named. Reproduce the failure using the arm v7 binary on Android, starting with the DNS lookup for tailcat.dev and the androiddns error, then trace the relevant lookup path; done means the DERPMap URL can be resolved and fetched successfully.

Written by the indexing model from the issue text.

Assessment

Tech stack
go
Domain
mobile-dev, networking
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Active
Clarity
Needs clarification
Newbie friendliness
35/100

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