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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 · 9 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.
mweinelt commented 2025-11-30 17:01:12 +00:00
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Not seen again since.

Not seen again since.
raito added this to the 2.96 milestone 2026-03-01 11:25:49 +00:00
raito commented 2026-03-03 02:29:38 +00:00
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Given the absence of reproducer, I'm closing. Please feel free to reopen if this reoccurs.

Given the absence of reproducer, I'm closing. Please feel free to reopen if this reoccurs.
raito closed this issue 2026-03-03 02:29:38 +00:00
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