diff --git a/.github/workflows/build-commit0-images.yml b/.github/workflows/build-commit0-images.yml
index 5d821d2e5..d54c668f8 100644
--- a/.github/workflows/build-commit0-images.yml
+++ b/.github/workflows/build-commit0-images.yml
@@ -58,6 +58,7 @@ env:
   N_LIMIT: ''
   INSTANCE_IDS: ''
   SELECT_FILE: ''
+  LOG_JSON: '1'  # Disable rich logging to prevent multiprocessing deadlock
 
 concurrency:
   group: build-commit0-${{ github.ref }}
@@ -182,8 +183,7 @@ jobs:
 
           echo "Running: $CMD"
           eval "$CMD"
-        env:
-          DOCKER_BUILDKIT: 1
+        env:          DOCKER_BUILDKIT: 1
           BUILDKIT_PROGRESS: plain
 
       - name: Archive build logs
diff --git a/.github/workflows/build-gaia-images.yml b/.github/workflows/build-gaia-images.yml
index 568e63113..d443acb65 100644
--- a/.github/workflows/build-gaia-images.yml
+++ b/.github/workflows/build-gaia-images.yml
@@ -18,6 +18,9 @@ concurrency:
   group: build-gaia-${{ github.ref }}
   cancel-in-progress: false
 
+env:
+  LOG_JSON: '1'  # Disable rich logging to prevent multiprocessing deadlock
+
 jobs:
   build-and-push:
     if: >
@@ -96,8 +99,7 @@ jobs:
           eval "$CMD"
 
           echo "✅ GAIA image with MCP layer built and pushed successfully"
-        env:
-          DOCKER_BUILDKIT: 1
+        env:          DOCKER_BUILDKIT: 1
           BUILDKIT_PROGRESS: plain
 
       - name: Archive build logs
diff --git a/.github/workflows/build-multiswebench-images.yml b/.github/workflows/build-multiswebench-images.yml
index 8999c0a9b..ff969eac1 100644
--- a/.github/workflows/build-multiswebench-images.yml
+++ b/.github/workflows/build-multiswebench-images.yml
@@ -64,6 +64,7 @@ env:
   BUILD_BATCH_SIZE: '15'
   BUILDKIT_PRUNE_KEEP_GB: '60'
   BUILDKIT_PRUNE_THRESHOLD_PCT: '60'
+  LOG_JSON: '1'  # Disable rich logging to prevent multiprocessing deadlock
 
 concurrency:
   group: build-multiswebench-${{ github.ref }}
diff --git a/.github/workflows/build-swebench-images.yml b/.github/workflows/build-swebench-images.yml
index 6053db373..88c697ed0 100644
--- a/.github/workflows/build-swebench-images.yml
+++ b/.github/workflows/build-swebench-images.yml
@@ -62,6 +62,7 @@ env:
   BUILD_BATCH_SIZE: '15'
   BUILDKIT_PRUNE_KEEP_GB: '60'
   BUILDKIT_PRUNE_THRESHOLD_PCT: '60'
+  LOG_JSON: '1'  # Disable rich logging to prevent multiprocessing deadlock
 
 concurrency:
   group: build-swe-bench-${{ github.ref }}
diff --git a/.github/workflows/build-swebenchmultimodal-images.yml b/.github/workflows/build-swebenchmultimodal-images.yml
index 9b11b0ad5..6ff080583 100644
--- a/.github/workflows/build-swebenchmultimodal-images.yml
+++ b/.github/workflows/build-swebenchmultimodal-images.yml
@@ -62,6 +62,7 @@ env:
   BUILD_BATCH_SIZE: '15'
   BUILDKIT_PRUNE_KEEP_GB: '60'
   BUILDKIT_PRUNE_THRESHOLD_PCT: '60'
+  LOG_JSON: '1'  # Disable rich logging to prevent multiprocessing deadlock
 
 concurrency:
   group: build-swe-bench-multimodal-${{ github.ref }}
diff --git a/.github/workflows/build-swegym-images.yml b/.github/workflows/build-swegym-images.yml
index 736ca3a81..e920d1532 100644
--- a/.github/workflows/build-swegym-images.yml
+++ b/.github/workflows/build-swegym-images.yml
@@ -58,6 +58,7 @@ env:
   BUILD_BATCH_SIZE: '15'
   BUILDKIT_PRUNE_KEEP_GB: '60'
   BUILDKIT_PRUNE_THRESHOLD_PCT: '60'
+  LOG_JSON: '1'  # Disable rich logging to prevent multiprocessing deadlock
 
 concurrency:
   group: build-swe-gym-${{ github.ref }}
@@ -240,8 +241,7 @@ jobs:
 
           echo "Running: $CMD"
           eval "$CMD"
-        env:
-          DOCKER_BUILDKIT: 1
+        env:          DOCKER_BUILDKIT: 1
           BUILDKIT_PROGRESS: plain
           BUILDKIT_RESET_ON_FAILURE: 1
 
diff --git a/.github/workflows/build-swesmith-images.yml b/.github/workflows/build-swesmith-images.yml
index a52a5c9f8..524c3981a 100644
--- a/.github/workflows/build-swesmith-images.yml
+++ b/.github/workflows/build-swesmith-images.yml
@@ -58,6 +58,7 @@ env:
   BUILD_BATCH_SIZE: '15'
   BUILDKIT_PRUNE_KEEP_GB: '60'
   BUILDKIT_PRUNE_THRESHOLD_PCT: '60'
+  LOG_JSON: '1'  # Disable rich logging to prevent multiprocessing deadlock
 
 concurrency:
   group: build-swe-smith-${{ github.ref }}
@@ -240,8 +241,7 @@ jobs:
 
           echo "Running: $CMD"
           eval "$CMD"
-        env:
-          DOCKER_BUILDKIT: 1
+        env:          DOCKER_BUILDKIT: 1
           BUILDKIT_PROGRESS: plain
           BUILDKIT_RESET_ON_FAILURE: 1
 
diff --git a/.github/workflows/build-swtbench-images.yml b/.github/workflows/build-swtbench-images.yml
index fe9d07be6..732fae429 100644
--- a/.github/workflows/build-swtbench-images.yml
+++ b/.github/workflows/build-swtbench-images.yml
@@ -63,6 +63,9 @@ concurrency:
   group: build-swt-bench-${{ github.ref }}
   cancel-in-progress: false
 
+env:
+  LOG_JSON: '1'  # Disable rich logging to prevent multiprocessing deadlock
+
 jobs:
   build-and-push:
     if: >
@@ -178,8 +181,7 @@ jobs:
 
           echo "Running: $CMD"
           eval "$CMD"
-        env:
-          DOCKER_BUILDKIT: 1
+        env:          DOCKER_BUILDKIT: 1
           BUILDKIT_PROGRESS: plain
 
       - name: Build prebaked eval env images
diff --git a/sitecustomize.py b/sitecustomize.py
index 50338d1a8..de030efd4 100644
--- a/sitecustomize.py
+++ b/sitecustomize.py
@@ -6,11 +6,35 @@
 this file at the repo root guarantees the patch runs before swebench is used.
 """
 
+import os
 import sys
 
 
+# ============================================================================
+# CENTRALIZED LOGGING CONFIGURATION
+# ============================================================================
+# Disable rich logging to avoid threading issues with multiprocessing.
+# Rich's RichHandler creates locks and threads that don't play well with fork().
+os.environ["LOG_JSON"] = "1"
+
 print("benchmarks sitecustomize imported", file=sys.stderr, flush=True)
 
+# Suppress verbose Docker build stderr warnings (75k+ lines from uv copying files).
+# This MUST be done in sitecustomize.py to affect forked child processes.
+# The SDK logs every "[stderr] copying..." line as WARNING, causing massive log output
+# and 3x slowdown with JSON logging (Rich logging throttled these automatically).
+try:
+    import logging
+
+    # Import SDK logger to trigger auto-configuration with LOG_JSON=1
+    from openhands.sdk.logger import get_logger  # noqa: F401
+
+    # Now suppress the verbose build logger in ALL processes (including forked children)
+    logging.getLogger("openhands.agent_server.docker.build").setLevel(logging.ERROR)
+except Exception:
+    # Best-effort: don't break if SDK structure changes
+    pass
+
 try:
     # Reuse the actual patch logic that lives alongside the benchmarks package.
     from benchmarks.utils.sitecustomize import _apply_modal_logging_patch