From 619f42c3b1d3bc2dd5a3d89766146cb9161f3c3b Mon Sep 17 00:00:00 2001
From: Michael Heller <21163552+mdheller@users.noreply.github.com>
Date: Thu, 23 Jul 2026 12:29:35 -0400
Subject: [PATCH] =?UTF-8?q?linux=20ci:=20add=2024G=20swap=20+=20-j2=20?=
 =?UTF-8?q?=E2=80=94=20nightly-linux=20OOM-dead=20(exit=20143)=20for=20a?=
 =?UTF-8?q?=20week?=
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The GitHub-hosted nightly-linux has failed every day for 8+ days, across many
commits predating any recent work — all exit 143 (SIGTERM/OOM). Firefox is too
big for the 16GB standard runner without swap. Same fix that got the Windows
lane past its OOM wall: 24G swapfile (ubuntu leg; fedora runs in a container
where swapon isn't available) + cap mach at -j2 so concurrent heavy TUs don't
exhaust RAM. The sovereign builder (32c/128GB) stays at full parallelism.
---
 .github/workflows/nightly-linux.yml | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/nightly-linux.yml b/.github/workflows/nightly-linux.yml
index e3a8106..00f5346 100644
--- a/.github/workflows/nightly-linux.yml
+++ b/.github/workflows/nightly-linux.yml
@@ -71,6 +71,17 @@ jobs:
           sudo docker image prune --all --force || true
           df -h /
 
+      - name: Add swap (16GB runners OOM the Firefox compile → exit 143)
+        if: matrix.container == ''
+        run: |
+          sudo swapoff -a || true
+          sudo rm -f /mnt/swapfile /swapfile || true
+          sudo fallocate -l 24G /mnt/swapfile
+          sudo chmod 600 /mnt/swapfile
+          sudo mkswap /mnt/swapfile
+          sudo swapon /mnt/swapfile
+          free -h
+
       - name: Install system dependencies
         run: |
           ${{ matrix.pkg_update }}
@@ -120,7 +131,10 @@ jobs:
 
       - name: Build BearBrowser
         working-directory: build/workspaces/${{ env.PROFILE }}-${{ env.VERSION }}-${{ env.RELEASE }}/source/bearbrowser-${{ env.VERSION }}-${{ env.RELEASE }}
-        run: MOZBUILD_STATE_PATH=${{ github.workspace }}/.mozbuild ./mach build
+        # -j2: mach's memory heuristic over-parallelizes on the 16GB runner and
+        # OOM-kills the compile (exit 143). Cap concurrent heavy TUs; the 24G
+        # swap above absorbs the rest. Same fix as nightly-windows.
+        run: MOZBUILD_STATE_PATH=${{ github.workspace }}/.mozbuild ./mach build -j2
 
       - name: Measure fingerprint on the REAL compiled binary (authoritative)
         if: matrix.distro == 'ubuntu'