Snapcraft concurrent build
Metadata
Current evaluation
Concurrent first-time builds can race during pyxdg cache-path creation; the flaw was still reported on Snapcraft 8.2.12 despite a 2022 upstream fix attempt.
Suggested action: keep open
Reason: Maintainer ~cjp256 acknowledged the race, ~twpayne linked pyxdg merge request !14 as an upstream fix, and a 2024 commenter reproduced it on Snapcraft 8.2.12. Current code still obtains the shared cache through BaseDirectory.save_cache_path and locks pyxdg 0.28, so this remains a valid unresolved CI concurrency failure.
Evaluated by: mr-cal-bot
Impact:
56
Quick Win:
23
Complexity:
52
Confidence:
91
Actionability:
84
Issue body
When running multiple instances of snapcraft concurrently there is a race condition in the `$HOME/.cache/snapcraft/download` and `stage-packages` creation.
Kicking off multiple instances of snapcraft where snapcraft hasn't already been run (like a CI system) causes a concurrency bug in the snapcraft python where two instances enter the check for the folders existing, both see the folder doesn't exist, then the first instance creates it and the second instance fails attempting to create it as it's already been done. Unlucky right?
I wanted proof - the way I proved it was to test with a single instance starting for snapcraft and it fixed it. Also pre-creating the folders with `mkdir -p` before launching snapcraft also resolves the issue.
For more details on the bug: https://github.com/goreleaser/goreleaser/issues/1715
I'm using snapcraft in docker following this guide here: https://snapcraft.io/docs/build-on-docker
Evaluation history
| Date | Model | Scores | Action | Summary |
|---|---|---|---|---|
| stealth/space-bunny-alpha |
Impact:
56
Quick Win:
23
Complexity:
52
Confidence:
91
Actionability:
84
|
keep open | Concurrent first-time builds can race during pyxdg cache-path creation; the flaw was still reported on Snapcraft 8.2.12 despite a 2022 upstream fix attempt. | |
| stealth/space-bunny-alpha |
Impact:
58
Quick Win:
22
Complexity:
52
Confidence:
89
Actionability:
78
|
keep open | Concurrent cold-cache Snapcraft builds race while creating cache directories. An upstream pyxdg fix was attempted, but the failure was still reported on Snapcraft 8.2.12. | |
| stealth/space-bunny-alpha |
Impact:
52
Quick Win:
24
Complexity:
38
Confidence:
77
Actionability:
74
|
needs triage | Concurrent Snapcraft builds reportedly race when first creating the download and stage-packages cache directories; pre-creating them avoids the failure. The report has no maintainer triage or reproducer. | |
| qwen/qwen3.8-27b |
Impact:
40
Quick Win:
24
Staleness:
85
Complexity:
40
Confidence:
55
Support Request:
10
|
needs triage | Race condition when running multiple snapcraft instances concurrently: both check for $HOME/.cache/snapcraft/download and stage-packages, both see missing, one creates, other fails. Reported ~6 years ago, 0 comments, no maintainer response, no labels. | |
| qwen/qwen3.6-35b-a3b |
Staleness:
90
Complexity:
40
Confidence:
85
Support Request:
10
|
close stale | Race condition in snapcraft when running concurrent builds, causing cache folder creation failures. The report remains unlabelled and inactive for over six years with no maintainer engagement. | |
| qwen/qwen3.6-35b-a3b |
Staleness:
95
Complexity:
40
Confidence:
90
Support Request:
10
|
needs triage | Reports a race condition when running multiple snapcraft instances concurrently, causing folder creation failures. Unlabeled, no maintainer comments, inactive for over two years. | |
| qwen/qwen3.6-35b-a3b |
Staleness:
95
Complexity:
10
Confidence:
80
Support Request:
5
|
close stale | Reports a race condition when running multiple snapcraft instances concurrently, causing folder creation failures. The issue is over 6 years old with no maintainer engagement or comments. | |
| qwen/qwen3.6-35b-a3b |
Staleness:
95
Complexity:
30
Confidence:
85
Support Request:
10
|
close stale | Concurrent snapcraft builds trigger a race condition during directory creation, causing failures. The report lacks maintainer labels or comments and has been inactive for over two years. | |
| qwen3.6-35b-a3b-mtp-q6 |
Staleness:
90
Complexity:
30
Confidence:
75
Support Request:
10
|
needs triage | Reports a race condition when running multiple snapcraft instances concurrently, causing folder creation failures. Unlabeled, no maintainer response, and inactive for over two years. |
Update history
| Date | Change |
|---|---|
| created |
Related work
-
Related To:
goreleaser#1715
(confidence 96%)
The issue links this report for concrete downstream context and reproduction of the concurrent-build failure.
-
Likely Fixed By:
pyxdg#14
(confidence 94%)
A maintainer explicitly linked this pyxdg merge request as the upstream race fix; the supplied evidence does not show that it was merged or released.
Related issues
No related issues found above the similarity threshold.