From 5cba1e3f88b4edb265e9976c78372192238ceb51 Mon Sep 17 00:00:00 2001
From: Christian Byrne <cbyrne@comfy.org>
Date: Thu, 11 Dec 2025 02:01:54 -0800
Subject: [PATCH] fix: prevent duplicate backport workflow runs for same PR
 (#7335)
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## Summary

When multiple labels are added to a PR in quick succession (e.g.,
`needs-backport` and `core/1.33`), each label triggers a separate
workflow run. Both runs would proceed independently, causing duplicate
failure comments or redundant work. This adds a concurrency group keyed
by PR number with `cancel-in-progress: false`, ensuring runs for the
same PR are serialized rather than racing.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7335-fix-prevent-duplicate-backport-workflow-runs-for-same-PR-2c66d73d36508140a603cd7110c42442)
by [Unito](https://www.unito.io)
---
 .github/workflows/pr-backport.yaml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/.github/workflows/pr-backport.yaml b/.github/workflows/pr-backport.yaml
index 69607d6fb..13fab6cdb 100644
--- a/.github/workflows/pr-backport.yaml
+++ b/.github/workflows/pr-backport.yaml
@@ -16,6 +16,10 @@ on:
         type: boolean
         default: false
 
+concurrency:
+  group: backport-${{ github.event_name == 'workflow_dispatch' && inputs.pr_number || github.event.pull_request.number }}
+  cancel-in-progress: false
+
 jobs:
   backport:
     if: >