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Status: the change is test-only. Reproduced the slow file and the weak leak bound locally on the debug ASAN build (39.1s, and a 400 MiB ASAN bound the leak could not reach). The new file passes 37 tests on Linux debug ASAN (5 runs, 13.7 to 17.4s), Linux release (1.0 to 1.1s) and Windows x64 release (7 runs, 5.3 to 5.6s). With the leak re-injected into PR: #41058 |
WalkthroughChangesThe FileSystemRouter test suite now runs concurrently with disposable route trees and normalized complete-object assertions. It adds coverage for routing, reloads, validation, decoding, memory cleanup, malformed inputs, filesystem edge cases, and Bun.build cache races. FileSystemRouter validation
Suggested reviewers: Merge Risk: 🟡 Moderate · up to The change improves filesystem-router coverage and test speed, but a query-decoding expectation may preserve incorrect double-decoding behavior and lead to future correctness regressions; the leak test’s memory metric also needs a platform-safe fallback. Merge should wait for these bounded test-contract and measurement issues to be addressed or explicitly accepted. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
Full details: Description checkExplanation The description explains the problem, implementation, verification command, performance results, test coverage, and known follow-up work. It does not use the template headings exactly, but it provides the required information. Comment |
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In `@test/js/bun/util/filesystem_router.test.ts`:
- Line 662: Update the rss assignment near the memory measurement to call
Bun.unsafe.memoryFootprint when available on all supported platforms, then fall
back to process.memoryUsage.rss() when it returns undefined; remove the
macOS-only platform gate while preserving the existing numeric RSS behavior.
- Line 1096: Update the query parsing flow exercised by URLPath::parse and
QueryStringMap to avoid decoding query components twice; preserve the raw
encoded value until the single decode step used for path parameters, so values
like x%25zz remain valid and encoded keys such as %2569d are checked for
route-parameter collisions before decoding.
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test/js/bun/util/filesystem_router.test.ts
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I reviewed this and didn't find any bugs. It's a large test rewrite (~1000 lines) that restructures shared state under describe.concurrent and changes what a few tests verify, so a human skim is still worthwhile.
What was reviewed:
- Concurrency safety of the shared
sharedTree/shared/sharedWithOrigin— only read by synchronous tests, which cannot interleave; async tests each spawn into their owntempDir, andafterAlldisposes after all concurrent tests settle. - The merged
[org]/+[team]/tree in the fewer-segments test — the combined router still asserts both routes match and/acmeis null; the old file's second isolated/acme→ null check is subsumed rather than lost. - The leak test's new
expectRssDeltaBelowbounds (20/30 MiB) sit well below the injected-leak floor (~78 MiB by construction, ~110 MiB measured) and above the no-leak reading, per REVIEW.md's RSS-threshold guidance. - The precomputed hash-collision pair — the test now asserts the collision precondition (same length, same low-32 wyhash, different bytes) before using it, so a future hash-seed change would fail loudly rather than pass vacuously.
Extended reasoning...
Overview
This PR rewrites test/js/bun/util/filesystem_router.test.ts in place: ~1050 lines added, ~930 removed, no production code touched. The old make()/createTree() helpers built on tmpdirSync + manual mkdirSync/rmSync are replaced with routeDir() on top of tempDir from harness (with Symbol.dispose for using), and every test is moved under describe.concurrent. A matched() helper projects MatchedRoute's prototype getters into a plain object so each match is asserted with a single .toEqual on {filePath, kind, name, params, pathname, query, src} instead of scattered .toBe calls. Read-only match tests share one router pair; mutating tests build their own trees. The leak test moves to expectRssDeltaBelow, the hash-collision test uses a precomputed verified pair, the GC-pressure test builds a fresh router per round (the routes getter caches), and two new tests cover match() argument validation and reload() on a removed directory.
Security risks
None. This is a test-only change with no runtime, build, or dependency modifications. Subprocesses are spawned via bunExe()/bunEnv into per-test tempDirs; nothing touches the network, credentials, or user-controlled parsing paths.
Level of scrutiny
Moderate. The diff is large but confined to a single test file and closely tracks the repo's own test conventions (tempDir over tmpdirSync, .toEqual over many .toBe, describe.concurrent, Buffer.alloc().toString(), stderr asserted before exit code, expectRssDeltaBelow with debug/release-branched bounds). The main correctness question is whether concurrency introduces cross-test interference: it does not, because the synchronous in-process tests cannot interleave on a single JS thread, the async tests run their FileSystemRouter work inside isolated subprocesses, and the shared read-only tree is disposed in afterAll after every test settles. No CODEOWNERS entry covers this path.
Other factors
Two behavioral shifts in what the tests verify are worth a human glance: (1) the "fewer segments" test now uses one tree containing both [org]/settings/[id].tsx and [team]/[...rest].tsx where the old file used two isolated routers — the merged form still asserts both matches and the null case, but the isolation is gone; (2) several tests now share a single router instance where they previously each constructed their own, which is fine for pure match() calls but is a structural change. The PR also notes a re-indent-only conflict with #40258 and a follow-up to remove the file from test/parallel-denylist.txt, both of which a maintainer will want to coordinate. The bug hunt ran to dry_streak with no findings and one candidate (the [org]/[team] merge) investigated and ruled out.
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Problem
kind,scriptSrc, theoriginandstylegetters, and the error paths atsrc/runtime/api/filesystem_router.rslines 133, 176, 185, 204, 235, 473, 525 have no test.Fix
routes,reload()on a removed directory,match()arguments, the constructor options.expectRssDeltaBelow(ASAN quarantine off): four 4 KiB segments, 5000 matches, bounds 20 / 30 MiB. No leak: 2 to 4 MiB. Leak re-injected: 110 to 112 MiB.describe.concurrentoverlaps the children. Read-only tests share onetempDirtree. The hash test uses the pair its search found.bun bd test test/js/bun/util/filesystem_router.test.ts. Debug ASAN 39.1s to 13.7s, Windows x64 5.64s to 5.3s.Background
reload() while Bun.build()race test: 5.2s on Windows, where onereload()of its 80-file tree costs 2.25ms. resolver: take entries_mutex in entries_at before the in-place DirEntry rewrite #34271 tuned that shape to reproduce a use-after-free.MatchedRoutehas prototype getters, sotoEqualon it seesMatchedRoute {}.matched()projects the fields. resolver: publish Entry.abs_path through the per-entry mutex #40258 also touches the race fixture (re-indent conflict only).Notes
Timing per test, debug ASAN, after: race test 10.5s, leak test 3.9s, the other seven children 0.28 to 0.57s each, all in-process tests under 0.45s (GC pressure test 0.43s, was 1.04s). Before: leak test 10.8s, hash collision search 8.0s, race test 13.3s. The in-process tests are synchronous, so
describe.concurrentdoes not overlap them. The win comes from the children.Race test split (probe with the same fixture shape). Linux release: 160 builds alone 716ms, 2000 reloads alone 788ms, interleaved 847ms. Windows x64 release: builds 694ms, reloads 4506ms, interleaved 4703ms. Windows reload cost scales with the entry count: 1 file 0.045ms, 40 files 1.14ms, 80 files 2.18ms. That is runtime behavior, not a test problem, so the shape is unchanged.
Leak test. Per match the leaked
QueryStringMapholds the four param values, so 5000 matches leak at least 4 x 4096 x 5000 bytes = 78 MiB. Measured with the leak injected intoMatchedRoute::deinit(core::mem::forget(this.param_map.take())), debug ASAN, quarantine off: 111.4, 110.3, 110.8 MiB. Without the leak: 3.2 to 4.3 MiB (debug ASAN), 1.6 to 2.8 MiB (release). The child takes 3.3 to 4.0s in debug ASAN (was 9.7s for 30000 matches of 512-byte segments) and 0.11 to 0.15s in release. The darwinmemoryFootprintreading is kept from #36429.Hash collision test. The old search over
"s" + i.toString(36).padStart(9, "0")stops at i = 65751 with the pairs000000io9/s000001eqf(low 32 bits of wyhash, seed 0: 2174181111). The test now asserts that precondition (same length, same low-32 hash, different bytes) and uses the pair.Child tests. Each child prints one JSON line that the parent compares with
toEqual. stderr is asserted before the exit code. Linux release: 1.32s before, 1.08s after.Pinned values. The query parameter cap is
MAX_QUERY_STRING_PARAMS = 2048insrc/url/lib.rs: the child reports 2048 keys,k0..k2047, and nok2048. The invalid route error is aBuildMessagewith the messageRoute is missing a closing bracket].pathnamekeeps the query string, asdocs/runtime/file-system-router.mdxdocuments.reload()on a removed directory reportsUnable to find directory: <dir>with a trailing native separator, so the test compares the message with forward slashes. On WindowsfilePathuses forward slashes for both spellings ofdir, sorouteDir()spellsdirthat way and the expected paths build on it.routesis a cached getter. The GC pressure test now builds a fresh router per round, sofromEntriesruns ten times instead of once.Counts. 35 tests before, 37 after (
match()argument validation andreload()on a removed directory are new).expect()calls 1564 before, 143 after: the GC pressure test alone ran 1280toBecalls that onetoEqualper round now covers. No test was removed, skipped or merged.Follow-up, not in this PR. The file is in
test/parallel-denylist.txt(it failed inside a parallel batch between builds 98887 and 99420). The old RSS test read the default ASAN quarantine and is a likely reason. Removing the entry is the lever for CI time and needs a batch run to confirm.Not changed on purpose. The long-route test needs its 11 x 201-byte path to pass the 2048-byte
JOIN_STACK_BUF_LENfast path. The many-query-params test needs more than 2048 parameters. The race test keeps its 80-file, 40-round, 50-reload shape.no test proof · iteration 0 · platform-specific test(s) that do not run on this machine, deferring to CI, which covers all platforms: test/js/bun/util/filesystem_router.test.ts