bun test: report a test file or preload the loader cannot resolve instead of exiting; keep the JUnit report valid UTF-8 - #38273
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…g silently JSC resolves a directly loaded specifier before it creates the load promise, so a specifier that does not resolve is thrown and the loadAndEvaluateModule/import bindings return null. Both Rust callers turned that into a bare JSError that nothing printed: bun test exited 1 after printing the file header and skipped every remaining file, and bun run printed "Error occurred loading entry point: JSError". The usual way to hit it is a test file or preload whose path contains bytes that are not valid UTF-8, which stops naming the file once it is a JS string. JSModuleLoader::load_and_evaluate_module_ptr and import_ptr now fold the thrown exception into a handled rejected promise, which is the path every other load failure already takes, so the error is printed, the file is counted as failed and the run continues. A resolution error with no referrer is worded "Cannot find module 'x'" rather than "... from ''". escape_xml replaces ill-formed UTF-8 with U+FFFD so the JUnit report, which declares encoding="UTF-8", stays parseable when a path, the hostname or a CI env var carries raw bytes; before this the --parallel crashed-file suite wrote the path bytes verbatim.
WalkthroughThe changes improve module-resolution exception propagation and diagnostics, clarify preload error behavior, and replace malformed UTF-8 with U+FFFD in XML output. New CLI, test-runner, path, and JUnit tests cover these cases. ChangesModule and CLI robustness
Possibly related PRs
Suggested reviewers: 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
Comment |
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Status: fix pushed (3 commits), waiting on CI. Reproduced on Linux with the release build: Related open PRs: #38258 (same bug, test-runner call site only; covered by the wrapper-level change here), #33408 (contains the same two |
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I reviewed this PR and didn't find any bugs. The fix is placed at the right layer and is well-tested, but it changes the error-return contract of JSModuleLoader::load_and_evaluate_module_ptr/import_ptr (used by five call sites across VirtualMachine.rs, jsc_hooks.rs, and bake/production.rs) and creates a fresh JSPromise on a JSC exception path, so a maintainer look would still be worthwhile.
What was reviewed:
- Traced all callers of the two changed loader functions; each already handles a rejected promise via
wait_for_promise/pending_internal_promise, and the previousNone/Err→CrateError::JSErrormapping still fires only for termination. - Verified
try_take_exception's C++ side usestryClearException(), so a termination exception is returned but left pending — theis_termination_exception()guard is reachable and correct. - Confirmed
JSInternalPromiseis an alias forJSPromiseand both__createbindings allocate the same structure, so the created promise is compatible withAnyPromise::Internalconsumers. escape_xml: fast path is unchanged for valid UTF-8 (simdutf validate); the slow path uses std'sutf8_chunks()and emits one U+FFFD per ill-formed sequence, matchingbstr::BStr.
Extended reasoning...
Overview
The PR fixes a silent-exit when bun test or --preload is handed a path whose bytes are not valid UTF-8. The core change is in src/jsc/JSModuleLoader.rs: when the C++ loadAndEvaluateModule/requestImportModule binding returns null with a pending exception (JSC throws synchronously during specifier resolution, before it has a promise), the Rust wrapper now takes the exception, wraps it in a rejected-as-handled JSPromise, and returns that instead of None/Err. Downstream callers already report rejected load promises, so the error surfaces without teaching each exit handler to print a pending exception. Secondary changes: ResolveMessage::fmt drops the trailing from '' when there is no referrer, and escape_xml now replaces ill-formed UTF-8 sequences with U+FFFD so the JUnit report stays parseable. The rest is tests and a canCreateNonUtf8FileNames() harness probe.
Security risks
None identified. The change is error-reporting only; no new input parsing, no privilege boundaries. The escape_xml change makes output strictly safer (well-formed UTF-8 where it previously could emit raw invalid bytes).
Level of scrutiny
Medium-high. The JSModuleLoader.rs change alters the return-value contract of two shared FFI wrappers with five call sites (VirtualMachine.rs:2730/2753/4828/5097, jsc_hooks.rs:835, bake/production.rs:339). I traced each: they all map None/Err to CrateError::JSError and otherwise wait on the promise, so a rejected promise routes through existing failure reporting. The termination-exception guard is correct — JSGlobalObject__tryTakeException uses tryClearException(), which returns the termination exception without clearing it, so the Rust-side is_termination_exception() check fires and None is returned with the exception still pending (matching prior behavior for that case). The created promise is a plain JSPromise (JSInternalPromise is now an alias per lib.rs:206; both C++ __create bindings allocate identically), and it stays on the stack across reject_as_handled, so conservative scanning keeps it live. RuntimeTranspilerStore.rs:317 uses the same create + return-as-pointer pattern.
Other factors
The PR is thoroughly tested (five new tests, each stated to fail on the unfixed build for the specific reason), the description traces the mechanism precisely to WebKit source lines, and the author ran the change under BUN_JSC_validateExceptionChecks=1. The bug-hunting system found nothing. That said, this is not a mechanical change: it introduces a new JSC allocation on an error path inside a core module-loading wrapper and shifts what None means to callers. Per the approval guidelines (touches critical code paths, JSC exception handling), a maintainer sign-off is appropriate rather than auto-approval.
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On the contract change: the two wrappers have six call sites in total, not just the two this fixes. Checked each one; all of them already had a rejected-promise path. |
…es are counted as tests
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Updated 5:05 AM PT - Aug 14th, 2026
❌ @robobun, your commit ebc21f6 has some failures in 🧪 To try this PR locally: bunx bun-pr 38273That installs a local version of the PR into your bun-38273 --bun |
…owing an uninitialized one When the resolver bails out with an exception already pending (a plugin's onResolve throwing is the reachable case) it never writes `res`, and moduleLoaderResolve threw an Exception built from the uninitialized `res.result.err`. For an entry point that crashed bun run once the error was printed, and now that the test runner reports direct-load failures it would have crashed there too. Zero the struct and only throw when nothing is pending, the way moduleLoaderImportModule already does. The tests now cover the portable ways of making a direct load fail to resolve (a throwing onResolve, a `?` in a scanned file name, a node: preload that does not exist) alongside the non-UTF-8 names, which only Linux can create.
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| /// | ||
| /// Every load failure comes back as a rejected promise (see | ||
| /// [`Self::reject_with_thrown_exception`]); `None` only while the VM is | ||
| /// being terminated, with the termination exception left pending. |
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| /// [`Self::load_and_evaluate_module_ptr`], including how failures are | ||
| /// reported: `Err` only while the VM is being terminated. |
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| /// JSC resolves the specifier before it has a promise to reject | ||
| /// (Completion.cpp `loadAndEvaluateModule`, JSModuleLoader.cpp | ||
| /// `requestImportModule`), so an unresolvable one is thrown and the binding | ||
| /// returns null. One way to get there is a path whose bytes are not valid | ||
| /// UTF-8: once it is a JS string it no longer names the file. The callers | ||
| /// report load failures from the promise, so deliver the error that way, | ||
| /// marked handled like the loader's own promises so the unhandled | ||
| /// rejection tracker does not report it a second time. |
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| // Entry points and preloads are loaded directly, not imported | ||
| // from anywhere; Node words those the same way. |
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| // The resolver leaves `res` untouched when it threw (a plugin's onResolve | ||
| // throwing, for instance); that exception is the one to keep. Same shape | ||
| // as moduleLoaderImportModule below. |
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| /// The report declares `encoding="UTF-8"`, but file paths, the hostname and the | ||
| /// CI env vars are raw OS bytes: ill-formed sequences become U+FFFD, as the | ||
| /// console already prints them (`bstr::BStr`). |
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| /// `Pending`/`NotFound` returns `error.ModuleNotFound`. A preload the module | ||
| /// loader cannot load comes back as a rejected promise like any other failing | ||
| /// preload; `JSModuleLoader.import` only fails (`error.JSError`) when the VM is | ||
| /// being terminated. |
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Actionable comments posted: 1
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Inline comments:
In `@test/harness.ts`:
- Around line 292-300: Resolve os.tmpdir() to an absolute path before passing it
to mkdtempSync in the non-UTF-8 filename probe, while preserving the existing
file creation, readdirSync, and cleanup behavior.
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📒 Files selected for processing (10)
src/jsc/JSModuleLoader.rssrc/jsc/ResolveMessage.rssrc/jsc/bindings/ZigGlobalObject.cppsrc/runtime/cli/test_command.rssrc/runtime/jsc_hooks.rstest/cli/run/preload-test.test.jstest/cli/test/bun-test.test.tstest/cli/test/parallel.test.tstest/harness.tstest/js/junit-reporter/junit.test.js
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I reviewed this PR and the automated bug-hunt didn't surface any issues. Since it changes the error-handling contract of the two JSModuleLoader wrappers (six call sites), touches moduleLoaderResolve's exception path in ZigGlobalObject.cpp, and adjusts user-visible resolve-error wording, a human look would still be worthwhile. There are also outstanding comment-cop notices on the new doc comments and a red CI build to sort out.
What was reviewed:
reject_with_thrown_exception: takes the pending exception, leaves termination exceptions pending, and marks the new internal promise handled — matches how the loader's own promises behave.moduleLoaderResolve:resis now zero-initialised and an already-pending exception is kept instead of throwingres.result.err(which was previously uninitialised on that path).escape_xml: fast-paths valid UTF-8 viais_valid_utf8and only walksutf8_chunks()for invalid input; multi-byte characters aren't split because the byte-wise escaper only rewrites ASCII metacharacters.
Extended reasoning...
Overview
The PR fixes bun test / --preload silently exiting when a directly-loaded specifier fails to resolve (e.g. a path with non-UTF-8 bytes, a throwing onResolve plugin, or a missing node: builtin), and keeps the JUnit report valid UTF-8 when OS-sourced bytes (paths, hostname, env vars) aren't. Source changes: src/jsc/JSModuleLoader.rs (wrap the synchronously-thrown resolve error in a handled rejected JSInternalPromise), src/jsc/bindings/ZigGlobalObject.cpp (moduleLoaderResolve: zero-init res and don't clobber a pending exception with an uninitialised one), src/jsc/ResolveMessage.rs (drop the from '' suffix when there is no referrer), src/runtime/cli/test_command.rs (escape_xml replaces ill-formed sequences with U+FFFD), and a doc-only update in src/runtime/jsc_hooks.rs. Five test files add coverage, plus a canCreateNonUtf8FileNames() harness probe.
Security risks
None identified. No auth/crypto/permissions surface. The XML change only tightens output (invalid bytes → U+FFFD). The C++ change stops throwing an uninitialised ZigErrorType, which is strictly a correctness improvement.
Level of scrutiny
High. The JSModuleLoader.rs change alters the return contract of load_and_evaluate_module_ptr / import_ptr for six call sites (test runner entry, preload loader, reload_entry_point ×2, macro loader, bake/production), and the ZigGlobalObject.cpp change sits in JSC's module-resolve exception path — both are areas the repo's review guidance calls out as needing careful audit of every consumer. The author enumerated all six sites and the PR description explains why each is unchanged in effect, but that reasoning is worth a maintainer confirming.
Other factors
- CI on the head commit is red (Build #95105); the author attributes at least the clippy failure to an unrelated main-branch issue, but the build status should be green before merge.
- The
comment-copbot left seven inline notices about long doc comments in the changed files; the author hasn't responded to or trimmed them. - Test coverage is thorough (each fix has a test that fails on the unfixed build per the description), and the new tests correctly gate on
canCreateNonUtf8FileNames()/isWindows. - The
ResolveMessage::fmtwording change is user-visible; the author checked the suite forfrom ''assertions, but a maintainer may want to confirm the new phrasing.
| /// JSC resolves the specifier before it has a promise to reject (Completion.cpp | ||
| /// `loadAndEvaluateModule`, JSModuleLoader.cpp `requestImportModule`), so that | ||
| /// failure alone is thrown, and the binding returns null. Callers report load | ||
| /// failures from the promise. Handled, like the loader's own promises: the | ||
| /// caller reports it, not the rejection tracker. |
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| /// Paths, the hostname and CI env vars are raw OS bytes; the report is declared | ||
| /// UTF-8, so ill-formed sequences become U+FFFD as on the console (`bstr::BStr`). |
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| /// `Pending`/`NotFound` returns `error.ModuleNotFound`, a load the module loader | ||
| /// refuses is a rejected promise, `error.JSError` means VM termination. |
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|
Pushed two follow-ups; the description is updated to match.
|
robobun
changed the title
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I reviewed this PR and didn't find any bugs. Because it changes the contract of the two shared JSModuleLoader wrappers (six call sites) and touches moduleLoaderResolve in the C++ JSC bindings, a human look would still be worthwhile.
What was reviewed:
reject_with_thrown_exception:tryClearExceptionleaves termination exceptions pending, matching the guard; the promise is marked handled so the rejection tracker doesn't double-report.ZigGlobalObject.cpp:ErrorableStringis a POD union+bool, somemsetis safe; the new!scope.exception()guard keeps a plugin's real throw instead of an uninitializedres.result.err.escape_xml: fast path unchanged for valid UTF-8; theutf8_chunksfallback emits one U+FFFD per ill-formed sequence, and every string in both the serial and parallel-crashed-suite writers goes through it.- The comment-cop and CodeRabbit notes were addressed in ebc21f6 (comments tightened; probe now uses
tmpdirSync, which realpathsos.tmpdir()).
Extended reasoning...
Overview
The PR fixes bun test silently aborting (exit 1, no error, no summary) when a scanned test file's or preload's specifier fails JSC's synchronous resolve step — the concrete trigger is a path containing bytes that are not valid UTF-8, but the same class covers a node: preload that does not exist and a plugin's onResolve throwing. It also makes the JUnit reporter emit U+FFFD for ill-formed byte sequences so the report stays valid UTF-8. Ten files: src/jsc/JSModuleLoader.rs (the fixing change), src/jsc/bindings/ZigGlobalObject.cpp (keep the resolver's own thrown exception instead of an uninitialized one), src/jsc/ResolveMessage.rs (drop from '' for entry-point/preload messages), src/runtime/cli/test_command.rs (escape_xml UTF-8 sanitization), a doc-comment update in src/runtime/jsc_hooks.rs, four test files, and a new canCreateNonUtf8FileNames() harness probe.
Security risks
None identified. The change tightens error reporting and output encoding; it does not add parsing of untrusted input, does not touch auth/crypto/permissions, and the U+FFFD substitution in escape_xml is output-side sanitization that only makes the JUnit report stricter.
Level of scrutiny
High. load_and_evaluate_module_ptr / import_ptr are the two wrappers every direct module load in the runtime goes through; changing what they return on failure is a contract change with six callers (test runner entry, preloads, reload_entry_point ×2, macro loader, bake production). The author enumerated each and I spot-checked that a rejected promise is already what those paths report from — but this and the moduleLoaderResolve C++ change are exactly the kind of shared-infrastructure edit that benefits from a maintainer's read.
Other factors
Test coverage is thorough (five new tests across four files, each stated to fail on the unfixed build; platform-gated via the new filesystem probe). The clippy failure in CI is unrelated (src/sourcemap/lib.rs, from #38263). The comment-cop bot and CodeRabbit's os.tmpdir() note were both addressed in the last commit (ebc21f66). No prior review from me on this PR.
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Problem
bun teststops dead on a scanned test file whose specifier the module loader cannot resolve: the file's header is printed, then exit 1 with no error, no summary, no--reporter-outfile, and the remaining files never run. Ways to get such a file: a name or directory name with bytes that are not valid UTF-8, a?in the file name, or a preload plugin whoseonResolvethrows for it.bun test --preloadwith a specifier the loader refuses (node:does_not_exist, a non-UTF-8 path) does the same;bun --preload node:does_not_exist main.jsprints onlyError occurred loading entry point: JSError. Debug builds adddebug warn: Unhandled error: JSError.--preloadhand the specifier to the module loader directly (JSC__JSModuleLoader__loadAndEvaluateModule,JSModuleLoader__import), and JSC resolves a direct load's specifier before it has a promise to reject (vendor/WebKit/.../runtime/Completion.cpp:195,JSModuleLoader.cpp:445), so that one failure is a thrown exception and the bindings return null.reload_entry_point_for_test_runner(src/jsc/VirtualMachine.rs:4828) andload_preloads(src/runtime/jsc_hooks.rs:835) turn null into a bareCrateError::JSError, and its handlers (handle_top_level_test_error_before_javascript_start,src/runtime/cli/test_command.rs:3409;entry_point_load_failed,src/runtime/cli/run_command.rs:1652) exit without printing the pending exception. Every later load failure (syntax error, missing import) arrives as a rejected promise and is reported.moduleLoaderResolve(src/jsc/bindings/ZigGlobalObject.cpp:3611) declaresErrorableString reswith onlysuccessinitialised. When the resolver returns because it already threw (a plugin'sonResolvethrowing is the reachable case) nothing writesres, and line 3685 threw anExceptionbuilt from the uninitialisedres.result.err. For an entry point that ispanic(main thread): Segmentation fault at address 0x0on currentbun --preload ./plugin.js ./main.js(the second repro of Propagate errors thrown by a runtime plugin's onResolve callback #33408); for a test file it was hidden by the silent exit, and the first fix below would have turned it into the same crash.bun test --parallel --reporter=junitwrites the synthetic crashed-file suite with the raw path bytes (src/runtime/cli/test/parallel/aggregate.rs:68), becauseescape_xml(src/runtime/cli/test_command.rs:144) works byte-wise; the hostname and the CI env vars written as<property>values are raw OS bytes too. The report declaresencoding="UTF-8"but is not UTF-8, so parsers reject it (Python:not well-formed (invalid token)).Fix
JSModuleLoader::load_and_evaluate_module_ptr/import_ptr(src/jsc/JSModuleLoader.rs): when the binding returns null, take the thrown exception and return a promise rejected with it, marked handled like the loader's own promises.None/Errare left for a pending termination exception, which is what they meant before in practice. This is the fixing change:bun testprints the error under the file's header, counts the file as failed, honours--bailand goes on to the next file (the same path a file with a missing import takes today);bun runprints the error and exits 1.VirtualMachine.rs:4828) andload_preloads(jsc_hooks.rs:835) are the cases above;reload_entry_point(VirtualMachine.rs:2730, and:2753underBUN_DISABLE_TRANSPILER=1) feedsrun_command's and the worker's rejected-entry reporting; the macro loader (VirtualMachine.rs:5097) reports throughunhandled_rejectioninMacro.rs;bake/production.rs:339re-throws the rejection and returns the sameJSErrorit returned for a null, so it is unchanged in effect.moduleLoaderResolve: zero the struct and only throwres.result.errwhen no exception is pending, the shapemoduleLoaderImportModule(the dynamicimport()hook,ZigGlobalObject.cpp:3750) already has. The plugin's own error is what gets reported. Propagate errors thrown by a runtime plugin's onResolve callback #33408 carries the same two lines plus a separateBunPlugin.cppfix foronResolvereturning a rejected promise; it is needed here for the first change to be safe, and whichever lands second drops the duplicate hunk.ResolveMessage::fmt: with no referrer (entry points, preloads) the message isCannot find module 'x'rather thanCannot find module 'x' from '', which is Node's wording for an entry point. The only other way to reach the empty-referrer wording isBun.resolveSync(specifier, ""), which drops thefrom ''as well; a real referrer takes theimported from <path>wording, untouched. Nothing in the suite asserts thefrom ''form.escape_xml: validate (simdutf) and, only for invalid input, write each ill-formed sequence as U+FFFD, which is how the console already prints these names (bstr::BStr). It is the one function every string in the report passes through, serial reporter and coordinator alike. bun test --reporter=junit: drop U+FFFE and U+FFFF from the report #38249 edits the inside of the same loop (dropping U+FFFE/U+FFFF); the two hunks are independent. Test names and error text are already valid UTF-8 when they get here (lone surrogates are replaced earlier), so OS-sourced bytes are the only input this changes.test/cli/test/bun-test.test.ts, "test files and preloads the module loader cannot resolve": a plugin whoseonResolvethrows for one of three files (the thrown message is reported, the other two run, 2 pass / 1 fail, exit 1; without the C++ change this case crashes), awhat?.test.tsamong two good files (skipped on Windows, where?is not a legal name), non-UTF-8 file and directory names (gated on the probe below), and--preload node:does_not_exist(No such built-in module, the file counted as failed). Before: the run aborted at the file, or exited with only the header.test/cli/run/preload-test.test.js:bun --preload node:does_not_exist main.jsprints the loader's error (before:Error occurred loading entry point: JSError); a preload plugin throwing for the entry point prints the plugin's error and exits 1 (before: segfault).test/cli/test/parallel.test.ts: a preload that exits makes each worker die on its first file, so the coordinator writes the crashed suite for a non-UTF-8 path; the report must decode as strict UTF-8 and name the file with U+FFFD (before: a raw0xFFbyte). A file with such a path can never produce a regular suite, so this is the one deterministic way to get the path into a report.test/js/junit-reporter/junit.test.js:GITHUB_SHAholding a0xFFbyte (set throughsh; a JS string cannot hold one) comes out asabc\uFFFDin thecommitproperty and the report parses (before: strict decode fails). Covers the serial reporter.test/harness.ts:canCreateNonUtf8FileNames()probes whether the temp filesystem stores such a name byte for byte (Linux does, macOS does not, Windows names are UTF-16); the two tests that need one skip elsewhere. The plugin,?andnode:cases run on every platform.test/cli/test/isolation.test.ts,test/js/bun/resolve/{resolve,resolve-error,import-meta-resolve,resolve-bad-parent,bun-main-entry-point,non-english-import},test/js/web/workers/worker.test.ts,cargo clippy -p bun_jsc -p bun_runtime, and the repros underBUN_JSC_validateExceptionChecks=1. The handful of timing tests that failed locally inworker.test.tsandparallel.test.tsfail the same way on a main build in the same container.VirtualMachine.rs; this PR's wrapper-level change covers that site along with the others, so the two should not both land.Background
bun runevaluates a generated entry module that imports the real file, so a bad entry path comes back as a rejected import and is printed. The test runner,--preload, macros and bake's config loader instead hand the specifier itself to the loader; all of those go through the two wrappers insrc/jsc/JSModuleLoader.rs, and that is where JSC's synchronous resolve throw shows up.moduleLoaderResolveis the hook JSC calls to resolve a specifier for static imports and direct loads; it calls Bun's resolver, which runsonResolveplugins and, when one throws, leaves that exception pending and returns without filling in its out-parameter.escape_xmlis the JUnit reporter's single output function for attribute values and text; under--parallelthe coordinator concatenates the workers' reports and writes paths itself only for files whose worker died.Before / after
Setup (Linux):
Before:
After:
Node 26 in the same directory (
node --test, files written withnode:test) reports the file the same way, runs the rest and exits 1:Plugin whose
onResolvethrows for*.test.js,bun test --preload ./plugin.js. Before:a.test.js:then exit 1. After:Same plugin for the entry point,
bun --preload ./plugin.js ./main.js. Before:panic(main thread): Segmentation fault at address 0x0, exit 139. After:error: onResolve refused main.js, exit 1.bun --preload node:nope a.js. Before:Error occurred loading entry point: JSError. After:error: No such built-in module: node:nope.--parallel=2 --reporter=junitwith the non-UTF-8 file, before (cat -v;M-^?is the raw0xFFbyte):After, the file is reported as a load error like in the serial run and the report parses; when a worker does die on such a file (the preload-exits case the test uses) the suite is written as
name="b\uFFFD.test.js".