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SSH connection dropping when copying outputs should not abort the entire build tree #922

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opened 2025-07-19 07:16:01 +00:00 by k900 · 7 comments
k900 commented 2025-07-19 07:16:01 +00:00
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When copying outputs from a remote builder on a bad connection, and the connection drops midway, the entire build tree is aborted with "truncated NAR encountered", followed by "some outputs are unexpectedly invalid".

The actual error is fine - the connection did drop, and we can't recover from that; however, killing all the concurrently running builds is bad.

When copying outputs from a remote builder on a bad connection, and the connection drops midway, the entire build tree is aborted with "truncated NAR encountered", followed by "some outputs are unexpectedly invalid". The actual error is fine - the connection _did_ drop, and we can't recover from that; however, killing all the concurrently running builds is bad.
pennae commented 2025-07-19 09:55:08 +00:00
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duplicate of #878?

duplicate of #878?
k900 commented 2025-07-19 09:56:28 +00:00
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Nope, this kills everything even with --keep-going.

Nope, this kills everything even with --keep-going.
pennae commented 2025-07-19 09:59:17 +00:00
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well thank fuck this codebase has historically been a perfect fount of consistent behavior

well thank fuck this codebase has historically been a perfect fount of consistent behavior
raito commented 2025-07-22 12:53:44 +00:00
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re: E/reproducible, I don't think anyone of us succeded into doing a repro or having a clear reproducer. Until we obtain this, this is going to be hard to action.

re: `E/reproducible`, I don't think anyone of us succeded into doing a repro or having a clear reproducer. Until we obtain this, this is going to be hard to action.
pennae commented 2025-07-22 12:55:21 +00:00
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this may just be #928

this may just be #928
raito commented 2025-07-22 18:30:24 +00:00
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@k900 tried to reproduce today and failed at reproduction, I don't know if they were using the #928 fixed revision or not.

@k900 tried to reproduce today and failed at reproduction, I don't know if they were using the #928 fixed revision or not.
mweinelt commented 2025-07-23 23:58:52 +00:00
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Seen on nix (Lix, like Nix) 2.94.0-devpre20250723_020751c.

The output on the remote builder wasn't written, but the coordinator was convinced it could pull it.

Had to --repair store paths on a number of machines, now waiting if it reappears.

Seen on `nix (Lix, like Nix) 2.94.0-devpre20250723_020751c`. The output on the remote builder wasn't written, but the coordinator was convinced it could pull it. Had to `--repair` store paths on a number of machines, now waiting if it reappears.
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Reference: lix-project/lix#922
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