Gahow Wang
b6591950bc
patches/0001-fix-kv-transfer-abort-race.patch: Fix scheduler assert crash when KV transfer callback arrives after request abort in PD-disaggregated serving. patches/README.md: How to apply patches to source tree or installed package. Per-patch description with problem/fix/impact. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
vLLM Patches
Patches against vLLM v0.18.1. Apply to either the source tree (third_party/vllm/) or the installed package.
Applying
# To source tree (for rebuilding)
cd third_party/vllm && git apply ../../patches/*.patch
# To installed package (quick, no rebuild)
SITE=$(python -c "import vllm; print(vllm.__path__[0])")
for p in patches/*.patch; do
patch -p1 -d "$(dirname $SITE)" < "$p"
done
Patches
0001-fix-kv-transfer-abort-race.patch
File: vllm/v1/core/sched/scheduler.py
Problem: When a client disconnects (timeout/abort) during PD-disaggregated serving, the Mooncake KV transfer callback arrives after the request has been removed from the scheduler. The assert req_id in self.requests kills the engine process.
Fix: Replace fatal assert with graceful skip + warning log.
Impact: Without this patch, decode instances crash after ~200 requests under sustained load with concurrent KV transfers.
Upstream: Not yet submitted. Could be upstreamed to vllm-project/vllm.