feat(inspector): runtime inspector activation via SIGUSR1 + CDP pause during busy execution#26867

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ali/inspector-cdp-pause

Commits on Mar 13, 2026

Initial work on supporting SIGUSR1

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[autofix.ci] apply automated fixes

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signal safe handler, some other review notes

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be clear about idempotency

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a cheap shot at windows

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consolidate windows/posix inspector logic with a new struct "RuntimeInspector"

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get it to compile

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implement process._debugProcess

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split up runtime inspector tests

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add --disable-sigusr1

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fix --disable-sigusr1 test for CI

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fix ban-words: use bun.strings.toWPath and proper struct defaults

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rm semaphore

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cleaner

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Add tests for SIGUSR1 handling with --inspect-* flags

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fix(test): replace timing-based waits with condition-based waits in SIGUSR1 tests

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fix(test): replace timing-based waits with condition-based waits in Windows inspector tests

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fix(test): replace timing-based waits with condition-based waits in runtime-inspector tests

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docs: document inspector port limitation in RuntimeInspector

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test: assert exit codes for debug helper processes in runtime-inspector tests

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test: improve exit code assertion clarity using toBeOneOf

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Add comment documenting alignment assumption for MapViewOfFile

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refactor: extract configureSigusr1Handler helper function

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Address PR review comments for runtime inspector

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fix(test): update Windows _debugProcess test to match Bun's error message

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fix: match Node.js error message for _debugProcess on Windows

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Skip failing test on Windows for now

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update test expectations, dont print tiwce

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fix review comments

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use a semaphore and properly inject jsc trap

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do a best effort uninstall case

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[autofix.ci] apply automated fixes

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use VMManager StopTheWorld to interrupt infinite loops for SIGUSR1 inspector

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use new WebKit version

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Upgrade WebKit to d5bd162d9ab2

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Update WebKit to preview-pr-135-a6fa914b

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Update WEBKIT_VERSION

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Fix InternalPromise exposure in ReadableStream builtins

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address coderabbit & DRYify some code that claude wrote twice

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address review

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fix a case where we'd have a stale jsc trap for a second `kill -USR1 pid`

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fix race where a second SIGUSR1 leaves stale trap

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fix: clean up semaphore if thread spawn fails

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test: check stderr before exit code for better error messages

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docs: add comment explaining QueuedTask payload parameter

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test: await stderr before checking exit code in runtime-inspector tests

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test: await debug2 stderr before checking exit code

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Remove comment

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Revert ReadableStreamInternals.ts changes

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Revert Request.zig import reordering

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[autofix.ci] apply automated fixes

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Skip flaky SIGUSR1 inspector tests on ASAN builds

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Address CodeRabbit review comments

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Fix runtime inspector tests: timing and stream reader issues

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Fix runtime inspector tests to wait for conditions, not time

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fix(sigusr1): handle EINTR in sem_wait and skip ASAN for flaky tests

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fix: address review comments

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fix: skip ASAN for flaky inspector test and add timeout handling

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fix: improve ASAN detection to check ASAN_OPTIONS env var

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WIP: inspector CDP delivery during busy JS execution

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fix: address review comments - guard redundant STW requests, add bootstrap pause VM switch

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fix: only use requestStopAll for message delivery when debugger was pre-attached

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fix: only use STW in connect() for runtime-activated inspector (SIGUSR1)

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fix: remove usePollingTraps to avoid DFG optimization regressions

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fix: address review - make preAttachedDebugger atomic, document STW threading safety

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fix(test): improve runtime inspector test reliability to reduce CI flakiness

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fix: address coderabbit review - clarify pre-attach guard, fix hardcoded port

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fix: deduplicate pre-attach comment in doConnect

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fix(test): remove all setTimeout from inspector test fixtures

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revert: undo changes to test/harness.ts

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fix: guard pre-attach debugger with runtimeInspectorActivated to fix Windows hang

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fix: replace preAttachedDebugger with runtimeInspectorActivated, add reconnection test

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fix(test): remove explicit test timeout per test/CLAUDE.md guidelines

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fix: use WebKit preview build with breakProgram() for reliable while(true) pause

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fix the race + some pr review

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simplify the atomics a bunch

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cleanup debugger file and tests

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make runtime-inspector less flaky

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[autofix.ci] apply automated fixes

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revert: use original WebKit version (breakProgram causes test failures)

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revert: restore preview WebKit with breakProgram() (reverts accidental revert)

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try to find a default port with runtime inspector in tests?

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some fixes

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set JSC::Options::usePollingTraps() = true; when the inspector starts because all js code will get recompiled and polling traps allow us to guarantee hitting STW

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update WebKit to autobuild-preview-pr-161-c7bcfafe (ali/stw3)

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address review comments: fix inspect_port ordering, improve error messages, add timeout guards to test loops

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fix inspect_port in initBake/second init, reorder exit code assertions in tests

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update WebKit to autobuild-preview-pr-161-aa4d1424 (fix heap walk crash on Linux)

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fix: cancel VM stop in event loop activation path to prevent residual trap crash

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remove accidentally committed printer.js

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try defer to fix a crash

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fix: set usePollingTraps in event loop activation path to stop SignalSender

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cleanup: use Bun__setRuntimeInspectorActivated in STW path too

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fix declare

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refactor(inspector): clean up BunDebugger.cpp naming and duplication

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update WebKit to autobuild-preview-pr-161-d796f228 (fix SignalSender crash on jettisoned code)

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fix: use --inspect-port=0 in posix SIGUSR1 tests to avoid port conflicts

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bisect: WebKit with VMTraps.cpp reverted to PR 159 (test if Debugger.cpp causes crash)

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fix: remove write to frozen JSC::Options::usePollingTraps (segfault on Linux)

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fix: safely write usePollingTraps by temporarily unprotecting frozen JSC config page

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this is definitely wrong

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update WebKit to autobuild-preview-pr-161-211cf848 (restore CDP drain in NeedDebuggerBreak)

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update WebKit to autobuild-preview-pr-161-0596ebdb (fix agent teardown on reconnect)

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fix: drain CDP messages after doConnect to prevent message loss on reconnect

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try fix race

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fix: restore connected for isBootstrap check

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[autofix.ci] apply automated fixes

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bump webkit

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fix webkit upgrade

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Try this

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Revert "fix webkit upgrade"

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bump webkit pr

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Update WEBKIT_VERSION in TypeScript build system
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Fix deadlock in CDP message drain and macOS semaphore spurious wake
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Fix undeclared identifiers in QueuedTask constructor calls
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Remove undeclared 'function' from QueuedTask in ZigGlobalObject.cpp
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Fix baseline CI builds by falling back to non-baseline WebKit
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Skip baseline suffix for preview WebKit builds in TS build system
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Commits on Mar 14, 2026

Commits on Mar 17, 2026

Merge branch 'main' into ali/inspector-cdp-pause
alii
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