fix: avoid panic on multi-byte UTF-8 chars in hash placeholder iterator by shulaoda · Pull Request #8790 · rolldown/rolldown

shulaoda · 2026-03-19T07:55:57Z

From #8783 to trigger preview

When source files contain multi-byte UTF-8 characters (e.g. Chinese filenames in SVG imports), the hash placeholder iterator could panic because the computed search_end byte offset landed in the middle of a multi-byte character, making &str[left_pos..search_end] an invalid slice.

Changes

crates/rolldown_utils/src/hash_placeholder.rs — Replace str::find over self.s[left_pos..search_end] with memchr::memmem::find over self.s.as_bytes()[left_pos..search_end]. Since all placeholder delimiters (!~{, }~) are ASCII, byte-level search is correct and the resulting right_pos is always a valid char boundary.
Add regression tests covering placeholders adjacent to Chinese characters and cases where the 3-byte boundary of a CJK character straddles search_end.

thread panicked at crates/rolldown_utils/src/hash_placeholder.rs:56:38:
byte index 1045 is not a char boundary; it is inside '级' (bytes 1044..1047) of `...vue.runtime.esm-bundler-!~{001}~.js`...

Original prompt

This section details on the original issue you should resolve

<issue_title>[Panic]: A panic occurred during the build process</issue_title>
<issue_description>### Panic message

rendering chunks (411)...Rolldown panicked. This is a bug in Rolldown, not your code.

thread '<unnamed>' (39028) panicked at crates\rolldown_utils\src\hash_placeholder.rs:56:38:
byte index 1045 is not a char boundary; it is inside '级' (bytes 1044..1047) of `import{C as e,D as t,Dt as n,E as r,J as i,K as a,O as o,S as s,Ut as ee,X as c,Z as l,b as u,ct as d,m as f,st as p,vt as m,x as h}from"./vue.runtime.esm-bundler-!~{001}~.js";import{t as g}from"./objectSpread2-!~{003}~.js";import{s as _}from"./router-!~{0`[...]
Rolldown panicked. This is a bug in Rolldown, not your code.
Rolldown panicked. This is a bug in Rolldown, not your code.
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
Rolldown panicked. This is a bug in Rolldown, not your code.
Rolldown panicked. This is a bug in Rolldown, not your code.

thread '<unnamed>' (45852) panicked at crates\rolldown_utils\src\hash_placeholder.rs:56:38:
byte index 582 is not a char boundary; it is inside '级' (bytes 581..584) of `import{C as e,D as t,Dt as n,J as r,K as i,O as a,Q as o,S as s,T as c,U as l,Ut as u,W as d,b as f,ct as p,m,n as h,st as g,u as _,vt as v,x as y}from"./vue.runtime.esm-bundler-!~{001}~.js";import{a as b}from"./dist-!~{005}~.js";import"./router-!~{00d}~.j`[...]
Rolldown panicked. This is a bug in Rolldown, not your code.

Reproduction

It seems the issue was related to Chinese characters in my SVG file name. After I renamed the Chinese names to English, the problem was fixed.

System Info

System:
    OS: Windows 11 10.0.26200
    CPU: (22) x64 Intel(R) Core(TM) Ultra 9 185H
    Memory: 6.36 GB / 31.43 GB
  Binaries:
    Node: 22.14.0 - C:\Program Files\nodejs\node.EXE
    Yarn: 1.22.22 - C:\Users\jay\AppData\Roaming\npm\yarn.CMD
    npm: 10.9.2 - C:\Program Files\nodejs\npm.CMD
    pnpm: 10.30.2 - C:\Users\jay\AppData\Roaming\npm\pnpm.CMD
  Browsers:
    Chrome: 146.0.7680.154
    Edge: Chromium (140.0.3485.54)
    Firefox: 141.0.3 - C:\Program Files\Mozilla Firefox\firefox.exe
    Internet Explorer: 11.0.26100.7309

Additional context

No response</issue_description>

Comments on the Issue (you are @copilot in this section)

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commit: a5039c8

github-actions · 2026-03-19T08:12:05Z

Benchmarks Rust

target: main(bcd3da0)
pr: copilot/fix-rolldown-panic-build-copy(177a092)

group                                                        pr                                     target
-----                                                        --                                     ------
bundle/bundle@multi-duplicated-top-level-symbol              1.01     64.0±1.72ms        ? ?/sec    1.00     63.4±1.62ms        ? ?/sec
bundle/bundle@multi-duplicated-top-level-symbol-sourcemap    1.03     73.3±2.22ms        ? ?/sec    1.00     71.4±1.54ms        ? ?/sec
bundle/bundle@rome_ts                                        1.00    137.5±4.27ms        ? ?/sec    1.00    137.2±2.82ms        ? ?/sec
bundle/bundle@rome_ts-sourcemap                              1.00    155.7±3.43ms        ? ?/sec    1.00    155.0±2.44ms        ? ?/sec
bundle/bundle@threejs                                        1.00     61.0±2.67ms        ? ?/sec    1.00     60.9±1.17ms        ? ?/sec
bundle/bundle@threejs-sourcemap                              1.01     71.4±2.49ms        ? ?/sec    1.00     70.7±2.09ms        ? ?/sec
bundle/bundle@threejs10x                                     1.00    696.0±5.71ms        ? ?/sec    1.01    703.2±7.20ms        ? ?/sec
bundle/bundle@threejs10x-sourcemap                           1.00    794.6±5.71ms        ? ?/sec    1.01    800.2±6.75ms        ? ?/sec

codspeed-hq · 2026-03-19T08:46:32Z

Merging this PR will not alter performance

✅ 6 untouched benchmarks
⏩ 8 skipped benchmarks¹

_{Comparing copilot/fix-rolldown-panic-build-copy (177a092) with main (ec68fd7)²}

8 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩
No successful run was found on main (bcd3da0) during the generation of this report, so ec68fd7 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

Boshen · 2026-03-21T16:18:15Z

Merge activity

Mar 21, 4:18 PM UTC: The merge label 'graphite: merge-when-ready' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
Mar 21, 4:18 PM UTC: Boshen added this pull request to the Graphite merge queue.
Mar 21, 4:22 PM UTC: Merged by the Graphite merge queue.

…or (#8790) From #8783 to trigger preview When source files contain multi-byte UTF-8 characters (e.g. Chinese filenames in SVG imports), the hash placeholder iterator could panic because the computed `search_end` byte offset landed in the middle of a multi-byte character, making `&str[left_pos..search_end]` an invalid slice. ## Changes - **`crates/rolldown_utils/src/hash_placeholder.rs`** — Replace `str::find` over `self.s[left_pos..search_end]` with `memchr::memmem::find` over `self.s.as_bytes()[left_pos..search_end]`. Since all placeholder delimiters (`!~{`, `}~`) are ASCII, byte-level search is correct and the resulting `right_pos` is always a valid char boundary. - Add regression tests covering placeholders adjacent to Chinese characters and cases where the 3-byte boundary of a CJK character straddles `search_end`. ``` thread panicked at crates/rolldown_utils/src/hash_placeholder.rs:56:38: byte index 1045 is not a char boundary; it is inside '级' (bytes 1044..1047) of `...vue.runtime.esm-bundler-!~{001}~.js`... ```  <details> <summary>Original prompt</summary> > > ---- > > *This section details on the original issue you should resolve* > > <issue_title>[Panic]: A panic occurred during the build process</issue_title> > <issue_description>### Panic message > > ```Shell > rendering chunks (411)...Rolldown panicked. This is a bug in Rolldown, not your code. > > thread '<unnamed>' (39028) panicked at crates\rolldown_utils\src\hash_placeholder.rs:56:38: > byte index 1045 is not a char boundary; it is inside '级' (bytes 1044..1047) of `import{C as e,D as t,Dt as n,E as r,J as i,K as a,O as o,S as s,Ut as ee,X as c,Z as l,b as u,ct as d,m as f,st as p,vt as m,x as h}from"./vue.runtime.esm-bundler-!~{001}~.js";import{t as g}from"./objectSpread2-!~{003}~.js";import{s as _}from"./router-!~{0`[...] > Rolldown panicked. This is a bug in Rolldown, not your code. > Rolldown panicked. This is a bug in Rolldown, not your code. > note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace > Rolldown panicked. This is a bug in Rolldown, not your code. > Rolldown panicked. This is a bug in Rolldown, not your code. > > thread '<unnamed>' (45852) panicked at crates\rolldown_utils\src\hash_placeholder.rs:56:38: > byte index 582 is not a char boundary; it is inside '级' (bytes 581..584) of `import{C as e,D as t,Dt as n,J as r,K as i,O as a,Q as o,S as s,T as c,U as l,Ut as u,W as d,b as f,ct as p,m,n as h,st as g,u as _,vt as v,x as y}from"./vue.runtime.esm-bundler-!~{001}~.js";import{a as b}from"./dist-!~{005}~.js";import"./router-!~{00d}~.j`[...] > Rolldown panicked. This is a bug in Rolldown, not your code. > ``` > > ### Reproduction > > It seems the issue was related to Chinese characters in my SVG file name. After I renamed the Chinese names to English, the problem was fixed. > > ### System Info > > ```Shell > System: > OS: Windows 11 10.0.26200 > CPU: (22) x64 Intel(R) Core(TM) Ultra 9 185H > Memory: 6.36 GB / 31.43 GB > Binaries: > Node: 22.14.0 - C:\Program Files\nodejs\node.EXE > Yarn: 1.22.22 - C:\Users\jay\AppData\Roaming\npm\yarn.CMD > npm: 10.9.2 - C:\Program Files\nodejs\npm.CMD > pnpm: 10.30.2 - C:\Users\jay\AppData\Roaming\npm\pnpm.CMD > Browsers: > Chrome: 146.0.7680.154 > Edge: Chromium (140.0.3485.54) > Firefox: 141.0.3 - C:\Program Files\Mozilla Firefox\firefox.exe > Internet Explorer: 11.0.26100.7309 > ``` > > ### Additional context > > _No response_</issue_description> > > ## Comments on the Issue (you are @copilot in this section) > > <comments> > </comments> > </details>  - Fixes #8782 - Fixes #8795 - Fixes #8806 - Fixes #8808  --- 💬 Send tasks to Copilot coding agent from [Slack](https://gh.io/cca-slack-docs) and [Teams](https://gh.io/cca-teams-docs) to turn conversations into code. Copilot posts an update in your thread when it's finished.

@IWANABETHATGUY

## [1.0.0-rc.11] - 2026-03-23 ### 🚀 Features - magicString replace with regex (#8802) by @IWANABETHATGUY - support `output.sourcemapExcludeSources` option (#8828) by @sapphi-red - support `getIndentString` in MagicString (#8775) by @IWANABETHATGUY - MagicString ignoreList support (#8773) by @IWANABETHATGUY ### 🐛 Bug Fixes - types: remove `pluginName` from `MinimalPluginContext` (#8864) by @sapphi-red - do not report eval?.() as direct eval (#8860) by @IWANABETHATGUY - handle negative indices, overlapping ranges, and moved content in MagicString remove (#8829) by @IWANABETHATGUY - enable arbitrary_precision for serde_json to fix JSON float parsing (#8848) by @elderapo - resolve TypeScript lint errors (#8841) by @Boshen - avoid panic on multi-byte UTF-8 chars in hash placeholder iterator (#8790) by @shulaoda - ci: skip failing vite build watch raw query test (#8840) by @Boshen - ci: use step-level env override to unset VITE_PLUS_CLI_BIN in vite tests (#8838) by @Boshen - ci: move vite tests into CI workflow by @Boshen - ci: unset all VITE_PLUS_* env vars in vite-tests workflow (#8837) by @Boshen - test: skip watch CLI tests on Windows (#8830) by @Boshen - ci: unset VITE_PLUS_CLI_BIN in vite-tests workflow (#8832) by @Boshen - remove redundant bare side-effect imports in entry/facade chunks (#8804) by @h-a-n-a - magicString prepend issues (#8797) by @IWANABETHATGUY - ci: use `vpx` instead of `vp exec` for `pkg-pr-new` (#8827) by @Boshen - set `order` for callable plugins (#8815) by @sapphi-red - handle reversed slice ranges with moved content (#8750) by @IWANABETHATGUY - update emnapi to latest to avoid version mismatch (#8781) by @sapphi-red - external.md on Windows OS (#8780) by @bddjr - align MagicString length/isEmpty with reference magic-string (#8776) by @IWANABETHATGUY ### 🚜 Refactor - extract canonical_ref_resolving_namespace helper (#8836) by @Boshen ### 📚 Documentation - improve external examples for cross-platform correctness (#8786) by @hyf0-agent - update reference to transform function in plugin API documentation (#8778) by @zOadT ### ⚡ Performance - reduce timing of `dervie_entries_aware_chunk_name` (#8847) by @AliceLanniste - bench: remove redundant sourcemap benchmark cases (#8825) by @Boshen - reduce intermediate allocations in `collapse_sourcemaps` (#8821) by @Boshen - enable parallel AST cloning on macOS (#8814) by @Boshen ### 🧪 Testing - watch: use polling watcher and retry for watch error test (#8772) by @sapphi-red ### ⚙️ Miscellaneous Tasks - justfile: skip setup-vite-plus if vp is already installed (#8862) by @Boshen - add expectWarning option to test config (#8861) by @IWANABETHATGUY - justfile: support windows for `just setup` (#8846) by @AliceLanniste - deps: update rust crates (#8852) by @renovate[bot] - deps: update endbug/version-check action to v3 (#8855) by @renovate[bot] - deps: update github-actions (#8853) by @renovate[bot] - deps: update dependency vitepress to v2.0.0-alpha.17 (#8854) by @renovate[bot] - deps: update npm packages (#8851) by @renovate[bot] - bench: use mimalloc as global allocator in bench crate (#8844) by @IWANABETHATGUY - reuse native build artifact in node-validation job (#8826) by @Boshen - speed up CodSpeed benchmark build by disabling LTO (#8824) by @Boshen - remove redundant critcmp benchmark job (#8823) by @Boshen - deps: update rust crate oxc_sourcemap to v6.1.0 (#8785) by @renovate[bot] - node: migrate oxlint and oxfmt to Vite+ (#8813) by @Boshen - revert namespace runners for release build jobs (#8820) by @Boshen - migrate runners to namespace (#8819) by @Boshen - test: relax test utils path assertion to support git worktrees (#8816) by @younggglcy - rename `examples/lazy` to `examples/lazy-compilation` (#8789) by @shulaoda - improve "needs reproduction" wording by @Boshen - deps: update dependency oxlint-tsgolint to v0.17.1 (#8807) by @renovate[bot] - enable 7 previously-skipped MagicString tests (#8771) by @IWANABETHATGUY - upgrade oxc to 0.121.0 (#8784) by @shulaoda - increase Windows dev drive size from 12GB to 20GB (#8779) by @Copilot ### ❤️ New Contributors * @elderapo made their first contribution in [#8848](#8848) * @younggglcy made their first contribution in [#8816](#8816) * @bddjr made their first contribution in [#8780](#8780) * @zOadT made their first contribution in [#8778](#8778) Co-authored-by: shulaoda <165626830+shulaoda@users.noreply.github.com>

@IWANABETHATGUY

## [1.0.0-rc.11] - 2026-03-23 ### 🚀 Features - magicString replace with regex (#8802) by @IWANABETHATGUY - support `output.sourcemapExcludeSources` option (#8828) by @sapphi-red - support `getIndentString` in MagicString (#8775) by @IWANABETHATGUY - MagicString ignoreList support (#8773) by @IWANABETHATGUY ### 🐛 Bug Fixes - forward test filters through vp run (#8870) by @younggglcy - types: remove `pluginName` from `MinimalPluginContext` (#8864) by @sapphi-red - do not report eval?.() as direct eval (#8860) by @IWANABETHATGUY - handle negative indices, overlapping ranges, and moved content in MagicString remove (#8829) by @IWANABETHATGUY - enable arbitrary_precision for serde_json to fix JSON float parsing (#8848) by @elderapo - resolve TypeScript lint errors (#8841) by @Boshen - avoid panic on multi-byte UTF-8 chars in hash placeholder iterator (#8790) by @shulaoda - ci: skip failing vite build watch raw query test (#8840) by @Boshen - ci: use step-level env override to unset VITE_PLUS_CLI_BIN in vite tests (#8838) by @Boshen - ci: move vite tests into CI workflow by @Boshen - ci: unset all VITE_PLUS_* env vars in vite-tests workflow (#8837) by @Boshen - test: skip watch CLI tests on Windows (#8830) by @Boshen - ci: unset VITE_PLUS_CLI_BIN in vite-tests workflow (#8832) by @Boshen - remove redundant bare side-effect imports in entry/facade chunks (#8804) by @h-a-n-a - magicString prepend issues (#8797) by @IWANABETHATGUY - ci: use `vpx` instead of `vp exec` for `pkg-pr-new` (#8827) by @Boshen - set `order` for callable plugins (#8815) by @sapphi-red - handle reversed slice ranges with moved content (#8750) by @IWANABETHATGUY - update emnapi to latest to avoid version mismatch (#8781) by @sapphi-red - external.md on Windows OS (#8780) by @bddjr - align MagicString length/isEmpty with reference magic-string (#8776) by @IWANABETHATGUY ### 🚜 Refactor - extract canonical_ref_resolving_namespace helper (#8836) by @Boshen ### 📚 Documentation - improve external examples for cross-platform correctness (#8786) by @hyf0-agent - update reference to transform function in plugin API documentation (#8778) by @zOadT ### ⚡ Performance - reduce timing of `dervie_entries_aware_chunk_name` (#8847) by @AliceLanniste - bench: remove redundant sourcemap benchmark cases (#8825) by @Boshen - reduce intermediate allocations in `collapse_sourcemaps` (#8821) by @Boshen - enable parallel AST cloning on macOS (#8814) by @Boshen ### 🧪 Testing - watch: use polling watcher and retry for watch error test (#8772) by @sapphi-red ### ⚙️ Miscellaneous Tasks - deps: update dependency @oxc-project/types to v0.122.0 (#8873) by @renovate[bot] - publish-to-npm: use correct vp pm publish (#8871) by @shulaoda - justfile: skip setup-vite-plus if vp is already installed (#8862) by @Boshen - add expectWarning option to test config (#8861) by @IWANABETHATGUY - justfile: support windows for `just setup` (#8846) by @AliceLanniste - deps: update rust crates (#8852) by @renovate[bot] - deps: update endbug/version-check action to v3 (#8855) by @renovate[bot] - deps: update github-actions (#8853) by @renovate[bot] - deps: update dependency vitepress to v2.0.0-alpha.17 (#8854) by @renovate[bot] - deps: update npm packages (#8851) by @renovate[bot] - bench: use mimalloc as global allocator in bench crate (#8844) by @IWANABETHATGUY - reuse native build artifact in node-validation job (#8826) by @Boshen - speed up CodSpeed benchmark build by disabling LTO (#8824) by @Boshen - remove redundant critcmp benchmark job (#8823) by @Boshen - deps: update rust crate oxc_sourcemap to v6.1.0 (#8785) by @renovate[bot] - node: migrate oxlint and oxfmt to Vite+ (#8813) by @Boshen - revert namespace runners for release build jobs (#8820) by @Boshen - migrate runners to namespace (#8819) by @Boshen - test: relax test utils path assertion to support git worktrees (#8816) by @younggglcy - rename `examples/lazy` to `examples/lazy-compilation` (#8789) by @shulaoda - improve "needs reproduction" wording by @Boshen - deps: update dependency oxlint-tsgolint to v0.17.1 (#8807) by @renovate[bot] - enable 7 previously-skipped MagicString tests (#8771) by @IWANABETHATGUY - upgrade oxc to 0.121.0 (#8784) by @shulaoda - increase Windows dev drive size from 12GB to 20GB (#8779) by @Copilot ### ❤️ New Contributors * @younggglcy made their first contribution in [#8870](#8870) * @elderapo made their first contribution in [#8848](#8848) * @bddjr made their first contribution in [#8780](#8780) * @zOadT made their first contribution in [#8778](#8778) --------- Co-authored-by: shulaoda <165626830+shulaoda@users.noreply.github.com>

github-actions bot assigned shulaoda Mar 19, 2026

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[Panic]: A panic occurred during the build process #8782

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hyf0 approved these changes Mar 19, 2026

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shulaoda marked this pull request as draft March 19, 2026 10:37

shulaoda marked this pull request as ready for review March 20, 2026 02:47

shulaoda force-pushed the copilot/fix-rolldown-panic-build-copy branch 2 times, most recently from 59208fe to 177a092 Compare March 20, 2026 02:50

Boshen added the graphite: merge-when-ready label Mar 21, 2026

graphite-app bot force-pushed the copilot/fix-rolldown-panic-build-copy branch from 177a092 to fd0adb5 Compare March 21, 2026 16:18

graphite-app bot merged commit fd0adb5 into main Mar 21, 2026
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graphite-app bot deleted the copilot/fix-rolldown-panic-build-copy branch March 21, 2026 16:22

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holybaechu mentioned this pull request Mar 23, 2026

chore(deps): update dependency vite to v8.0.2 holybaechu/hchu-me#28

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[Panic]: vite build 报错 #8859

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[Panic]: UTF-8 char ø in __toESM #8867

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release: v1.0.0-rc.11 #8868

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release: v1.0.0-rc.11 #8872

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fix: avoid panic on multi-byte UTF-8 chars in hash placeholder iterator#8790

fix: avoid panic on multi-byte UTF-8 chars in hash placeholder iterator#8790
graphite-app[bot] merged 1 commit intomainfrom
copilot/fix-rolldown-panic-build-copy

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✅ Deploy Preview for rolldown-rs ready!

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Benchmarks Rust

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Merging this PR will not alter performance

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shulaoda commented Mar 19, 2026 •

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Boshen commented Mar 21, 2026 •

edited by graphite-app bot

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