stale-while-revalidate causing memory leak with cache interceptor #4208
Description
Reproducible By
node --expose-gc --inspect stale-while-revalidate.mjs
https://gist.github.com/olessavluk/8bdfb495c2b48c3baaab3dd704f85403
Logs & Screenshots
Example output
{
rss: 107.09375,
heapTotal: 72.96875,
heapUsed: 37.90514373779297,
external: 3.2410106658935547,
arrayBuffers: 0.1122894287109375
}
Runnig 100 request sequentially
{
rss: 2600.625,
heapTotal: 2205.65625,
heapUsed: 2170.1848220825195,
external: 281.41249084472656,
arrayBuffers: 231.66439628601074
}
Runnig 100 request sequentially
{
rss: 2736.78125,
heapTotal: 2044.453125,
heapUsed: 2008.7924270629883,
external: 512.9489650726318,
arrayBuffers: 486.3542881011963
}
Sleeping for 2s to trigger GC
{
rss: 2737.296875,
heapTotal: 75.09375,
heapUsed: 40.322914123535156,
external: 466.6343173980713,
arrayBuffers: 463.193058013916
}
^ see how much `external` & `arrayBuffers` increased with each run?
Environment
node v20.18.0
undici 7.9.0
uname -a: ... 24.4.0 Darwin Kernel Version 24.4.0: Fri Apr 11 18:33:47 PDT 2025; root:xnu-11417.101.15~117/RELEASE_ARM64_T6000 arm64