mimalloc: register fork handlers once per process (fixes macOS abort in astro/vite builds); build: --local-deps - #38291
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WalkthroughSummaryThe build system accepts ChangesLocal dependency override
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In `@scripts/build/bun.ts`:
- Around line 1166-1169: Update the assertion in the local-dependency validation
around dep.enabled and dep.enabled(cfg) to include the configured checkout path,
explain that the dependency is disabled for the selected target/configuration,
and instruct the user to remove the local override or choose a
target/configuration where it is enabled.
In `@scripts/build/config.ts`:
- Around line 1440-1456: Add hermetic regression coverage for the local
dependency override flow centered on parseLocalDeps and its CLI consumers: test
valid relative, absolute, and home-relative paths; malformed entries; unknown or
disabled dependency names; and verify local sources bypass fetching, patching,
and .ref creation while preserving incremental-build behavior. Place the test
alongside the affected build tests and ensure it runs with the project’s bun bd
test command.
- Around line 1440-1454: The parseLocalDeps function must safely handle a
dependency name of __proto__ without prototype mutation or validation bypass.
Return a null-prototype dictionary (or use a Map consistently with its
consumers), preserve normal name/path parsing, and add regression coverage
confirming the entry is retained and unknown-name validation does not silently
accept it.
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Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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📒 Files selected for processing (9)
scripts/build.tsscripts/build/CLAUDE.mdscripts/build/bun.tsscripts/build/compile.tsscripts/build/config.tsscripts/build/deps/README.mdscripts/build/deps/mimalloc.tsscripts/build/source.tstest/js/node/process/process.test.js
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…l checkout Iterating on a fork (mimalloc, libuv, ...) meant cutting a commit and bumping the pin per round, or editing vendor/<name>/ in place and losing it on the next re-fetch. `--local-deps=mimalloc=~/code/mimalloc` redirects any github-archive dep to a checkout: no fetch, no .ref stamp, patches not applied, banner shows local:<name>. Objects for an out-of-repo checkout map onto obj/vendor/<name>/ so nothing escapes the build dir, and local/in-tree direct deps no longer stamp their source directory (that made the PCH an implicit dependent of the directory's mtime); the compiler depfiles already track edits. Unknown or disabled dep names fail at configure.
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…in astro/vite builds) Bumps oven-sh/mimalloc to 6e891cbe, the bun-dev3-v2 merge of oven-sh/mimalloc#19. The dev3 sync in bun#37367 left mimalloc's pthread_atfork call outside the once-guard in mi_process_init(), which every mi_heap_new() reaches, so each transpile job's heap registered another handler triple. macOS caps the atfork table at one page (~680 entries); once full, BoringSSL's own pthread_atfork got ENOMEM and init_pthread_fork_detection() aborted on the first RAND_bytes. That is the SIGABRT in astro-post.test.js and vite-build.test.ts on the darwin lanes. Linux was unaffected (glibc's list is unbounded).
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This PR may be a duplicate of:
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…me map - The disabled-dep error names the target and the checkout path and says what to do about it. - parseLocalDeps returns a null-prototype record so a name like __proto__ is kept and rejected as unknown instead of vanishing. No-Verification-Needed: build-script messages/parsing only
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… the graph never reads - depSourceDir() returns the --local-deps checkout when one is set, so lsquic's -I into boringssl/lshpack/lsqpack/zlib and boringssl's nasm -I follow a redirect instead of pointing at an unfetched vendor/<name>/. - lolhtml is github-archive but build:none with no sources/includes: the graph only fetches it and cargo reads vendor/lolhtml through Cargo.toml. Redirecting it did nothing while the banner said local:lolhtml; it now fails at configure with a pointer to the real consumer. Docs qualified.
… atfork table) Spawned fixture for the mimalloc pthread_atfork regression: 800 one-line .ts imports (each transpile job creates a mimalloc heap) followed by crypto.randomBytes(4). With the fork handlers registered per mi_heap_new the macOS atfork table fills and BoringSSL's init_pthread_fork_detection() aborts; fails with SIGABRT on 18391f6's darwin build, passes with the bumped mimalloc. Darwin-only: other libcs grow the table dynamically.
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Additional findings (outside current diff — PR may have been updated during review):
-
🔴
test/internal/build-local-deps.test.ts:189-195— This test hardcodes forward-slash ninja paths (build obj/vendor/mimalloc/...,|| obj/.dir) butNinja.rel()returns rawnode:path.relative()output andninjaEscapePath()doesn't normalize separators, so on a Windows host the emitted line isbuild obj\vendor\mimalloc\src\static.c.obj: cc ..\mimalloc\src\static.c || obj\.dir—findEdge(...startsWith('build obj/vendor/...'))returnsundefinedand the.toBe(...)fails. The one-sided.replaceAll('\\', '/')onsrc(line 191) shows the intent to run cross-host but leaves the ninja text unnormalized. Fix: normalize the whole ninja text before matching (const out = n.toString().replaceAll('\\', '/')) and drop the one-sided replaceAll onsrc, or gate this one case withtest.skipIf(isWindows).Extended reasoning...
What the bug is
The final test in
test/internal/build-local-deps.test.ts("a checkout outside the repo compiles in place with no fetch, no stamp, and objects under obj/vendor//") asserts on the exact text of a generated ninja build edge using forward-slash path literals:const src = relative(cfg.buildDir, join(checkout, 'src', 'static.c')).replaceAll('\\', '/'); expect(findEdge(out, l => l.startsWith(`build obj/vendor/mimalloc/src/static.c${cfg.objSuffix}: `))).toBe( `build obj/vendor/mimalloc/src/static.c${cfg.objSuffix}: cc ${src} || obj/.dir`, );
The file's header comment says "Configure-time logic only … so this runs on every host" and the test is not gated with
skipIf(isWindows). But on a Windows host, every path in the generated build edge uses backslashes, so neither thefindEdgepredicate nor the.toBe(...)expectation can match.The code path
hostConfig()passes noosoverride, so on a Windows hostresolveConfig()setscfg.os = 'windows'andcfg.objSuffix = '.obj'.resolveDep()→emitDirect()→cc()emits the compile edge vian.build({...}), andNinja.build()(ninja.ts:215–219) writes each path throughninjaEscapePath(this.rel(p)).Ninja.rel()(ninja.ts:124–129) is justreturn relative(this.buildDir, path), importingrelativefromnode:path(notnode:path/posix). On Windows this returns backslash-separated paths.ninjaEscapePath()(ninja.ts:354–356) only escapes$, spaces, and:; there is no separator normalization anywhere in the writer.n.toString()(ninja.ts:296–316) just joins the accumulated lines.
So on a Windows host the emitted line is:
build obj\vendor\mimalloc\src\static.c.obj: cc ..\mimalloc\src\static.c || obj\.dirWhy existing code doesn't prevent it
The author was aware of separators —
srcis normalized with.replaceAll('\\', '/')on line 191 — but that only fixes one operand of the equality. The ninja text itself (the output pathobj\vendor\...and the order-onlyobj\.dir) is left in host form, so:findEdge(out, l => l.startsWith('build obj/vendor/mimalloc/src/static.c.obj: '))never matches → returnsundefined.- Even if the predicate were fixed,
.toBe('build obj/vendor/... || obj/.dir')would compare a backslash line against forward-slash literals.
The sibling files this test was patterned on avoid the problem by chance:
build-post-link-ordering.test.tsonly asserts on separator-free basenames (bun-profile,bun.exe), andbuild-debug-info-flags.test.tspinsos: 'linux'. This is the firsttest/internal/build-*.test.tsassertion on a multi-segment ninja path.The earlier assertion at line 185 (
resolved!.objects) is fine on Windows — both sides go throughresolve(), which normalizes to the platform separator. Only the ninja-text assertion at lines 192–194 breaks.Step-by-step proof (Windows host)
tempDircreates e.g.C:\Users\ci\Temp\build-local-deps-XXXXwithmimalloc\src\static.candmimalloc\include\mimalloc.h.hostConfig({localDeps: 'mimalloc=<tmp>\mimalloc'}, '<tmp>\build')→resolveConfigdetects host OS = windows,cfg.buildDir = '<tmp>\build',cfg.objSuffix = '.obj'.clangTargetArch('/fake/llvm/bin/clang')fails to spawn on Windows and returnsundefined, soresolveConfigfalls through tohost.arch— no throw.resolveDep(n, cfg, mimalloc, ...)→emitDirect→cc(n, cfg, '<tmp>\mimalloc\src\static.c', ...).objectPath()maps the local-deps checkout onto<repo>\vendor\mimalloc\src\static.cand returns'<tmp>\build\obj\vendor\mimalloc\src\static.c.obj'.n.build({outputs:[…], rule:'cc', inputs:[…], orderOnlyInputs:['<tmp>\build\obj\.dir']})callsninjaEscapePath(this.rel(p))on each path.rel('<tmp>\build\obj\vendor\mimalloc\src\static.c.obj')='obj\vendor\mimalloc\src\static.c.obj';rel('<tmp>\mimalloc\src\static.c')='..\mimalloc\src\static.c';rel('<tmp>\build\obj\.dir')='obj\.dir'.ninjaEscapePathpasses backslashes through.n.toString()yields a linebuild obj\vendor\mimalloc\src\static.c.obj: cc ..\mimalloc\src\static.c || obj\.dir.findEdge(out, l => l.startsWith('build obj/vendor/mimalloc/src/static.c.obj: '))iterates everybuildline; none starts with the forward-slash prefix → returnsundefined.expect(undefined).toBe('build obj/vendor/mimalloc/src/static.c.obj: cc ../mimalloc/src/static.c || obj/.dir')fails.
Impact
test/internal/*.test.tsfiles run on the Windows CI lane — sibling files gate individual cases withtest.skipIf(isWindows)(build-rust-toolchain-probe.test.ts:31,rust-windows-sys-link.test.ts:28,source-lints/windows-cross-config.test.ts:77), which would be pointless if the directory were excluded. This new test has no such guard, so merging as-is turns the Windows test lane red.How to fix
Either:
- Normalize once and match on that:
const out = n.toString().replaceAll('\\', '/');and drop the one-sided.replaceAllonsrc(line 191). This keeps the assertion running on Windows and matches the file's own "runs on every host" claim. - Or gate just this case:
test.skipIf(isWindows)("a checkout outside the repo …", …)(importisWindowsfrom"harness"), matching the pattern inbuild-rust-toolchain-probe.test.ts.
| let sourceStamp: string | undefined; | ||
| if (source.kind === "github-archive") { | ||
| sourceStamp = emitFetch(n, cfg, dep.name, source, patches, [...resolvedSources, ...directSources]); |
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🟡 lsquic's DirectBuild lists depSourceDir(cfg,'lsqpack')+'/lsqpack.c' as a source, so it lands in directSources and is passed to emitFetch as an implicit output of lsquic's fetch — but with --local-deps that mis-attribution now bites both ways. --local-deps=lsquic=… skips lsquic's emitFetch, so on a fresh checkout vendor/lsqpack/lsqpack.c has no producing rule and ninja fails with "missing and no known rule to make it"; conversely --local-deps=lsqpack=… (via the depSourceDir redirect at line 679) makes lsquic's dep_fetch declare the user's <checkout>/lsqpack.c as an implicit output, so ninja -t clean deletes it from their working tree. Consider filtering directSources to paths under the dep's own srcDir before passing them to emitFetch, and declaring lsqpack.c in lsqpack's own provides.sources so lsqpack's fetch is its producer.
Extended reasoning...
What the bug is
resolveDep() collects every DirectBuild source into directSources and, in the github-archive branch (source.ts:788), hands the whole list to emitFetch as compiledSources, which emitFetch declares as implicitOutputs of the dep's dep_fetch edge. lsquic is the one dep whose sources[] reaches into another dep's tree: deps/lsquic.ts:144 includes depSourceDir(cfg, 'lsqpack') + '/lsqpack.c' (lsqpack itself has build:{kind:'direct', sources:[]} and no provides.sources, so lsqpack's own fetch never declares lsqpack.c as an output). Before this PR that mis-attribution was harmless — the file lived under disposable vendor/lsqpack/ and lsquic's fetch was always emitted. --local-deps breaks both assumptions.
Direction A — --local-deps=lsquic=…: no producer
With lsquic redirected, depSource() returns {kind:'local'}, so resolveDep takes the else branch at line 789 and directSources is discarded — it is only consumed in the github-archive branch. lsqpack's own emitFetch receives compiledSources=[] (empty sources[], no provides.sources), so nothing declares vendor/lsqpack/lsqpack.c as a build output. emitDirect(lsquic) still emits a cc edge with vendor/lsqpack/lsqpack.c as an explicit input and lsqpack's .ref only as an order-only input via fetchDepStamps. Ninja checks explicit inputs at graph-load time: an explicit-input node must either exist on disk or have an in-edge, else it errors with "missing and no known rule to make it" before running anything — order-only doesn't help (it only affects scheduling). This is exactly the invariant the emitFetch comment ("otherwise ninja errors 'missing and no known rule to make it' on fresh checkouts") and picohttpparser.ts:5-8 document.
Direction B — --local-deps=lsqpack=…: wrong producer, in the user's tree
Commit 6c057b7's depSourceDir() change (source.ts:679) makes depSourceDir(cfg,'lsqpack') return the user's checkout path when lsqpack is redirected. lsquic (not redirected) then puts the absolute path /home/me/lsqpack/lsqpack.c into its sources[]; resolve(srcDir, <abs>) returns <abs> unchanged, so it flows into directSources → emitFetch(...,'lsquic',...) → implicitOutputs. build.ninja ends up with build ../../vendor/lsquic/.ref | … /home/me/lsqpack/lsqpack.c: dep_fetch | …. dep_fetch has restat = 1 but not generator = 1, so ninja -t clean iterates edge->outputs_ (which holds explicit + implicit outs) and unlinks the user's checkout file — silent loss of whatever they were iterating on, which is the point of --local-deps. It's also semantically wrong: lsquic's fetch (extract lsquic tarball to vendor/lsquic/) never touches /home/me/lsqpack.
Step-by-step proof (direction A)
bun bd --local-deps=lsquic=~/code/lsquicon a checkout wherevendor/lsqpack/has never been fetched.parseLocalDeps→cfg.localDeps = { lsquic: '/home/me/code/lsquic' }.resolveDep(lsqpack): github-archive,buildSpec.sources=[],provides.sourcesundefined →emitFetch(...,'lsqpack',...,[])declares no implicit outputs.resolveDep(lsquic):depSource()seeslocalDeps.lsquic→ returns{kind:'local', path:'/home/me/code/lsquic'}.buildSpec.sourcesincludesvendor/lsqpack/lsqpack.c(lsqpack is not redirected, sodepSourceDirreturnsvendor/lsqpack);directSources=[..., '<repo>/vendor/lsqpack/lsqpack.c'].source.kind !== 'github-archive'→ theelsebranch runs;directSourcesis never read again.emitDirect(lsquic)emitsbuild obj/vendor/lsqpack/lsqpack.c.o: cc ../../vendor/lsqpack/lsqpack.c || ../../vendor/lsqpack/.ref ….- Ninja loads the graph: node
../../vendor/lsqpack/lsqpack.chas no in-edge and does not exist on disk → "ninja: error: '../../vendor/lsqpack/lsqpack.c', needed by 'obj/vendor/lsqpack/lsqpack.c.o', missing and no known rule to make it".
Step-by-step proof (direction B)
bun bd --local-deps=lsqpack=/home/me/lsqpack --configure-only.depSourceDir(cfg,'lsqpack')→/home/me/lsqpack(line 679). lsquic.ts:144 →sources: [..., '/home/me/lsqpack/lsqpack.c'].resolveDep(lsquic): lsquic not inlocalDeps→ github-archive;directSources.push(resolve('vendor/lsquic', '/home/me/lsqpack/lsqpack.c'))→/home/me/lsqpack/lsqpack.c.- Line 788:
emitFetch(n, cfg, 'lsquic', source, patches, [...resolvedSources, '/home/me/lsqpack/lsqpack.c'])→n.build({ outputs:[refStamp], implicitOutputs:['/home/me/lsqpack/lsqpack.c'], rule:'dep_fetch', ... }). ninja -C build/debug -t cleanwalks every non-generator edge and removes each entry ofedge->outputs_(implicit outputs included) →/home/me/lsqpack/lsqpack.cis deleted from the user's git checkout.
Why existing safeguards miss it, and impact
validateBunConfig (bun.ts:1157-1183) checks the redirected dep's own name/enabled/build-kind, not deps that reference it via depSourceDir(). objectPath()'s remap (compile.ts:531-538) correctly puts the .o under obj/vendor/lsqpack/ but doesn't touch the fetch edge's implicitOutputs. The follow-up commit's manual verification used --local-deps=lshpack=…, and lshpack is only referenced for -I includes — lsqpack is the sole cross-dep whose source file is compiled by another dep. Impact is dev-tooling only: CI and the shipped binary are unaffected, the primary documented use cases (mimalloc, libuv) work fine, direction A is a loud immediate error with a trivial workaround (build once without the flag first, or also redirect lsqpack), and direction B requires the specific combo of redirecting lsqpack + running raw ninja -t clean — but the direction-B failure mode is silent deletion of user-edited source, and the graph is semantically wrong regardless.
Suggested fix
In resolveDep, only pass the entries of directSources that live under this dep's own srcDir to emitFetch (e.g. directSources.filter(p => p.startsWith(srcDir + sep))) — a dep's dep_fetch should never declare files it does not extract. Separately, add sources: ['lsqpack.c'] to lsqpack's provides so lsqpack's own fetch declares vendor/lsqpack/lsqpack.c as its output; that fixes direction A even when only lsquic is redirected. (Direction B is not fixed by provides.sources alone — with lsqpack redirected to local, lsqpack has no fetch edge — so the srcDir filter is required.)
| } | ||
| const name = entry.slice(0, eq); | ||
| let path = entry.slice(eq + 1); | ||
| if (path === "~" || path.startsWith("~/")) path = join(homedir(), path.slice(1)); |
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🟡 The tilde expansion here handles ~ and ~/ but not ~\ — on a Windows host, --local-deps=mimalloc=~\code\mimalloc resolves to <repo>\~\code\mimalloc and fails the existsSync check with a confusing path. The sibling site at scripts/build/deps/webkit.ts:178 already handles all three forms; per REVIEW.md's "fix the whole class — grep for every sibling site sharing the pattern", this should match (or both should share an expandHome() helper).
Extended reasoning...
What the bug is
parseLocalDeps (scripts/build/config.ts:1454) expands a leading ~ in a --local-deps path with:
if (path === "~" || path.startsWith("~/")) path = join(homedir(), path.slice(1));This handles the POSIX form only. On a Windows host, where backslash is the native path separator and cmd/PowerShell do not shell-expand ~, a user who types --local-deps=mimalloc=~\code\mimalloc gets no expansion — the string ~\code\mimalloc falls through to resolve(cwd, path) and becomes <repo>\~\code\mimalloc.
The sibling site
scripts/build/deps/webkit.ts:178 performs the same tilde expansion for $BUN_WEBKIT_PATH and already handles all three forms:
if (env === "~" || env.startsWith("~/") || env.startsWith("~\\\\")) return join(homedir(), env.slice(1));These are the only two ~-expansion sites in scripts/build/. REVIEW.md's "Fix the whole class in the same PR — grep for every sibling site sharing the pattern; prefer moving the guard into the shared helper" applies directly: the new site should either match the established pattern or both sites should call a shared expandHome() helper.
Step-by-step proof
On a Windows host, with --local-deps=mimalloc=~\code\mimalloc:
parseArgsputsoverrides.localDeps = "mimalloc=~\\code\\mimalloc".parseLocalDepssplits on,, findseqat index 8, setsname = "mimalloc",path = "~\\code\\mimalloc".path === "~"→ false.path.startsWith("~/")→ false (second char is\\, not/). No expansion.resolve(cwd, "~\\code\\mimalloc")→C:\Users\me\bun\~\code\mimalloc(on Windows,~is not special topath.resolve; it's treated as a relative segment).cfg.localDeps.mimalloc = "C:\\Users\\me\\bun\\~\\code\\mimalloc".validateBunConfigpasses (mimalloc is a known, always-enabled, direct-build dep).resolveDep→depSourcereturns{kind:'local', path:'C:\\...\\bun\\~\\code\\mimalloc'}, sosrcDiris that path.- Build kind is
direct→stampFile = "",sourceStamp = undefined, and theexistsSync(sourceStamp ?? stampDir)assert fires with:local dep "mimalloc" source not found at C:\Users\me\bun\~\code\mimalloc.
The user intended C:\Users\me\code\mimalloc. The error message is loud but points at a path with a literal ~ component, which is at least mildly confusing.
Why nothing else prevents it
Nothing between arg parsing and resolveDep normalizes separators or expands ~ — the only expansion is this line. Windows shells don't expand ~ themselves (unlike bash), so the raw string reaches the process argv verbatim.
Impact
Minor. This is dev-only build tooling; the shipped binary and CI are unaffected. The docs, help text, and PR description only advertise the ~/ form (--local-deps=mimalloc=~/code/mimalloc), so a Windows user typing ~\ is off the documented path. The failure is immediate and loud (configure-time error naming a path), not silent misbehavior. But it's an inconsistency with the established sibling site, and REVIEW.md explicitly asks for sibling sites sharing a pattern to be fixed together.
Fix
Match the sibling:
if (path === "~" || path.startsWith("~/") || path.startsWith("~\\\\")) path = join(homedir(), path.slice(1));Or better — since two call sites now hand-roll the same expansion — extract an expandHome(p: string): string helper (e.g. in config.ts or a small paths.ts) and call it from both parseLocalDeps and webkitSrcDir.
2 participants
What was crashing
test/js/third_party/astro/astro-post.test.jsandtest/integration/vite-build/vite-build.test.tsSIGABRT on the darwin lanes since #37367 (build 95095). Stack:The mimalloc dev3 sync left
pthread_atfork(...)inmi_process_init()after itsmi_atomic_do_onceblock instead of insidemi_process_init_once().mi_process_init()is reached from everymi_heap_new(), so each transpile job / arena reset registered another handler triple (~1050 registrations by the time astro's build reaches its firstrandomBytes). macOS caps a process's atfork table at one page (~680 entries on arm64); once full, every otherpthread_atforkin the process getsENOMEM, and BoringSSL aborts on that. glibc's list is unbounded, so Linux only leaked entries.Minimal repro: 700 trivial
.tsimports followed bycrypto.randomBytes(4)→abort(); 600 is fine.Fix
Bump
oven-sh/mimallocto6e891cbe— thebun-dev3-v2merge of oven-sh/mimalloc#19 — which moves the call back under the once-guard and adds a regression case to the fork'stest-fork-user-heap(fails withENOMEMon macOS before, passes after).process.versions.mimallocexpectation updated.Verified locally with
build:releaseon macOS arm64, same build config both ways:randomBytesastro-post.test.jsbe7eb3f(current pin)6e891cbe(tree-identical to the testedf201f52a)Also:
--local-deps=name=pathAdded while chasing this so a vendored dep can be built from a local checkout instead of the pinned tarball:
Works for any
github-archivedep (name=path[,name=path]); no fetch /.ref/ patches, banner showslocal:<name>, unknown or disabled names fail at configure, and an out-of-repo checkout's objects map ontoobj/vendor/<name>/. Editing the checkout rebuilds incrementally (for mimalloc: juststatic.c.o+ link). Local/in-treedirectdeps also stop stamping their source directory as a PCH dependency (depfiles already track edits). Default-configbuild.ninjais byte-identical apart from the pin. Docs inscripts/build/deps/README.md.