Repository: node
Issue: Cannot set a breakpoint on some modules
Labels: confirmed-bug,inspector

# Environment
- macOS 10.15.7
- Node.js 15.x.x

# Steps to Reproduce
```
$ node inspect -e "console.log('hello')"
< Debugger listening on ws://127.0.0.1:9229/c66c9b5b-fe08-43df-8494-0cd1609f277d
< For help, see: https://nodejs.org/en/docs/inspector
< Debugger attached.
Break on start in [eval]:1
> 1 console.log('hello')
debug> step
break in internal/console/constructor.js:341
 339 const consoleMethods = {
 340   log(...args) {
>341     this[kWriteToConsole](kUseStdout, this[kFormatForStdout](args));
 342   },
 343
debug> step
break in internal/console/constructor.js:305
 303     ...consolePropAttributes,
 304     value: function(args) {
>305       const opts = this[kGetInspectOptions](this._stdout);
 306       return formatWithOptions(opts, ...args);
 307     }
debug> out
break in internal/console/constructor.js:341
 339 const consoleMethods = {
 340   log(...args) {
>341     this[kWriteToConsole](kUseStdout, this[kFormatForStdout](args));
 342   },
 343
debug> step
break in internal/console/constructor.js:242
 240     ...consolePropAttributes,
 241     value: function(streamSymbol, string) {
>242       const ignoreErrors = this._ignoreErrors;
 243       const groupIndent = this[kGroupIndent];
 244
debug> list()
 237     }
 238   },
 239   [kWriteToConsole]: {
 240     ...consolePropAttributes,
 241     value: function(streamSymbol, string) {
>242       const ignoreErrors = this._ignoreErrors;
 243       const groupIndent = this[kGroupIndent];
 244
 245       const useStdout = streamSymbol === kUseStdout;
 246       const stream = useStdout ? this._stdout : this._stderr;
 247       const errorHandler = useStdout ?
debug> setBreakpoint(245)
Uncaught Error: Could not resolve breakpoint - undefined
    at _pending.<computed> (internal/deps/node-inspect/lib/internal/inspect_client.js:243:27)
    at Client._handleChunk (internal/deps/node-inspect/lib/internal/inspect_client.js:213:11)
    at Socket.emit (events.js:314:20)
    at Socket.EventEmitter.emit (domain.js:486:12)
    at addChunk (_stream_readable.js:321:12)
    at readableAddChunk (_stream_readable.js:297:9)
    at Socket.Readable.push (_stream_readable.js:236:10)
    at TCP.onStreamRead (internal/stream_base_commons.js:192:23)
    at TCP.callbackTrampoline (internal/async_hooks.js:129:14) {
  code: -32000
}
debug> cont
< hello
< Waiting for the debugger to disconnect...
debug>
```

# Expected Behavior
Able to set a breakpoint without any errors.

# Actual Behavior
Cannot set a breakpoint. Getting an error and a stack trace shown on [Steps to Reproduce](#Steps-to-Reproduce) section.

# Analysis
If this is indeed a bug and not the expected behavior, I understand that 7a447bc is the commit that introduced this. How I reached this opinion is:

1. Observed this issue on my local Node.js installation, which is `15.3.0`.
1. Using the [n version manager] for Node.js, tested it on all Node.js versions from `14.4.0` to `14.15.1`. Observed that the issue does not happen on any of these versions.
1. Then tested it with `15.0.0` and `15.0.1`. The issue was observed in both versions (as well as my initial Node.js version, which is `15.3.0`). Deduced that the issue starts with version 15.
1. Using the [n version manager], did a binary search on [Node.js nightly] binaries from `v14.0.0-nightly20200421c3554307c6` (the last version that starts with `v14`) to `v16.0.0-nightly20201021c2ceb15fd5` (the first version that starts with `v16`). That is, I performed a manual `git bisect`; first I downloaded `v14.0.0-nightly20200421c3554307c6` and observed that it works fine. Then I downloaded `v16.0.0-nightly20201021c2ceb15fd5` and observed that the issue is present. Then downloaded the version that's in the middle of them (which is `v15.0.0-nightly2020072341c1e72b76`) and observed that the issue is present.
1. After a couple steps, I have realized that `v15.0.0-nightly20200717bf0d82c102` is the last version that issue is _not_ observed and `v15.0.0-nightly202007187a447bcd54` is the first version that issue is observed. Upon observing this, I ran a [comparison on GitHub] between the commits of these versions (which are bf0d82c102 for the last working version and 7a447bcd54 for the first broken version). GitHub told me that the following are the commits between those versions:
    - bf0d82c
    - 08e8997
    - 5aeaff6
    - d10c59f
    - d379b00
    - 404302f
    - ef9964f
    - f045387
    - 1faf6f4
    - 7ecb285
    - 0b8ae5f
    - c943cb4
    - f8bde7c
    - b1c3909
    - 7a447bc
1. Downloaded the [Node.js source code], checked out bf0d82c, configured (`./configure`) and built it (`make -j8`) on my machine (which is macOS 10.15.7 with xcode-select version 2373). Observed that it works properly.
1. Then, consecutively, checked out all commits (starting with 08e8997 and going towards 7a447bc), built them and tested them. Observed that the issue does not happen in any of them except the last commit, which is 7a447bc.
1. Hence, if this is indeed a bug, I deduced that 7a447bc is the commit that introduced this bug.

<details>
  <summary>My nightly build test results for reference (click on the arrow to expand)</summary>

  ```
  WORKS - v15.0.0-nightly20200422d08bd41248/                 22-Apr-2020 07:30                   -
  v15.0.0-nightly202004236a07eca49c/                 23-Apr-2020 07:30                   -
  v15.0.0-nightly202004240619b600b2/                 24-Apr-2020 07:00                   -
  v15.0.0-nightly2020042524a4e6153d/                 25-Apr-2020 07:30                   -
  v15.0.0-nightly20200426f8d5474839/                 26-Apr-2020 07:00                   -
  v15.0.0-nightly202004275ee1e31e38/                 27-Apr-2020 07:30                   -
  v15.0.0-nightly20200428307c67be17/                 28-Apr-2020 08:30                   -
  v15.0.0-nightly20200429e7b99e027b/                 29-Apr-2020 07:30                   -
  v15.0.0-nightly202004302496db8e09/                 30-Apr-2020 07:30                   -
  v15.0.0-nightly20200501e9518254d7/                 01-May-2020 08:30                   -
  v15.0.0-nightly202005027c36ec38f1/                 02-May-2020 07:00                   -
  v15.0.0-nightly20200503b0aba53195/                 03-May-2020 07:00                   -
  v15.0.0-nightly20200504bde5f9baf7/                 04-May-2020 08:30                   -
  v15.0.0-nightly20200505c17dcb3253/                 05-May-2020 08:30                   -
  v15.0.0-nightly2020050686fdaa7455/                 06-May-2020 07:30                   -
  v15.0.0-nightly202005078607f9ec5c/                 07-May-2020 07:00                   -
  v15.0.0-nightly20200508bcdbd57134/                 08-May-2020 07:30                   -
  v15.0.0-nightly20200509be7fd2d517/                 09-May-2020 07:00                   -
  v15.0.0-nightly2020051094e5b5c77d/                 10-May-2020 07:00                   -
  v15.0.0-nightly202005118a6fab02ad/                 11-May-2020 07:00                   -
  v15.0.0-nightly202005128c5d58b5a7/                 12-May-2020 07:00                   -
  v15.0.0-nightly202005135bb4d01fbe/                 13-May-2020 07:30                   -
  v15.0.0-nightly20200514eaa16cd477/                 14-May-2020 07:30                   -
  v15.0.0-nightly2020051524bf1adacc/                 15-May-2020 07:30                   -
  v15.0.0-nightly20200516b533fb3508/                 16-May-2020 07:00                   -
  v15.0.0-nightly20200517b3ca8869a6/                 17-May-2020 07:30                   -
  v15.0.0-nightly20200518ef1eb8d439/                 18-May-2020 08:30                   -
  v15.0.0-nightly20200519fe1b9e09a8/                 19-May-2020 07:30                   -
  v15.0.0-nightly20200520a82001a387/                 20-May-2020 07:30                   -
  v15.0.0-nightly20200521cd4985c488/                 21-May-2020 07:00                   -
  v15.0.0-nightly2020052251af89fe45/                 22-May-2020 07:00                   -
  v15.0.0-nightly20200523a416692e93/                 23-May-2020 07:00                   -
  v15.0.0-nightly20200524dd5f209213/                 24-May-2020 08:30                   -
  v15.0.0-nightly20200525458677f5ef/                 25-May-2020 07:00                   -
  v15.0.0-nightly202005265007611294/                 26-May-2020 08:30                   -
  v15.0.0-nightly202005279949a2e1e3/                 27-May-2020 08:30                   -
  v15.0.0-nightly2020052847044a91c6/                 28-May-2020 08:30                   -
  v15.0.0-nightly202005296a1df3b5af/                 29-May-2020 07:30                   -
  v15.0.0-nightly20200530d79c330186/                 30-May-2020 07:00                   -
  v15.0.0-nightly202005312935f72ae1/                 31-May-2020 08:30                   -
  v15.0.0-nightly20200602b1704e4347/                 02-Jun-2020 07:30                   -
  v15.0.0-nightly20200603680fb8fc62/                 03-Jun-2020 07:30                   -
  v15.0.0-nightly202006043a7a5d7e62/                 04-Jun-2020 07:30                   -
  v15.0.0-nightly202006053e2a300710/                 05-Jun-2020 07:30                   -
  WORKS - v15.0.0-nightly202006063ac50e1209/                 06-Jun-2020 07:30                   -
  v15.0.0-nightly20200607d8eef83757/                 07-Jun-2020 08:30                   -
  v15.0.0-nightly202006088a4b5c63e0/                 08-Jun-2020 07:30                   -
  v15.0.0-nightly20200609921f75534c/                 09-Jun-2020 08:30                   -
  v15.0.0-nightly20200610362e4a1aec/                 10-Jun-2020 14:30                   -
  v15.0.0-nightly20200611f4e805c860/                 11-Jun-2020 08:30                   -
  v15.0.0-nightly20200612bba9b008ef/                 12-Jun-2020 07:30                   -
  v15.0.0-nightly202006137b46793eee/                 13-Jun-2020 08:30                   -
  v15.0.0-nightly20200614c17d2f9901/                 14-Jun-2020 07:30                   -
  v15.0.0-nightly20200615f645cc7318/                 15-Jun-2020 08:30                   -
  v15.0.0-nightly20200616b371213d3d/                 16-Jun-2020 09:00                   -
  v15.0.0-nightly20200617ee7f0e3f75/                 17-Jun-2020 07:30                   -
  v15.0.0-nightly20200618a4f3206b76/                 18-Jun-2020 07:30                   -
  v15.0.0-nightly2020061956967afdca/                 19-Jun-2020 08:30                   -
  v15.0.0-nightly20200620fdf10adef8/                 20-Jun-2020 07:30                   -
  v15.0.0-nightly20200622122038c6a2/                 22-Jun-2020 07:00                   -
  v15.0.0-nightly2020062386cbad837b/                 23-Jun-2020 06:30                   -
  v15.0.0-nightly20200624d8f8723577/                 24-Jun-2020 07:00                   -
  v15.0.0-nightly20200625e405e82f74/                 25-Jun-2020 07:00                   -
  v15.0.0-nightly20200626e18afe45d2/                 26-Jun-2020 07:00                   -
  v15.0.0-nightly20200627f63436d190/                 27-Jun-2020 07:00                   -
  v15.0.0-nightly20200628f89530fccc/                 28-Jun-2020 09:00                   -
  WORKS - v15.0.0-nightly2020062990d5f35f7a/                 29-Jun-2020 07:30                   -
  v15.0.0-nightly20200630c23d2fd3f8/                 30-Jun-2020 07:30                   -
  v15.0.0-nightly20200701e2b468eb5c/                 01-Jul-2020 07:30                   -
  v15.0.0-nightly20200702c118304ad0/                 02-Jul-2020 08:30                   -
  v15.0.0-nightly202007031dc837ed9a/                 03-Jul-2020 07:30                   -
  v15.0.0-nightly20200704bff7de3b43/                 04-Jul-2020 08:00                   -
  v15.0.0-nightly2020070556dbe466fd/                 05-Jul-2020 07:00                   -
  v15.0.0-nightly2020070667ba825037/                 06-Jul-2020 08:30                   -
  v15.0.0-nightly2020070730612316e4/                 07-Jul-2020 07:30                   -
  v15.0.0-nightly20200708e0ecde9737/                 08-Jul-2020 07:30                   -
  v15.0.0-nightly202007096ae1b9c457/                 09-Jul-2020 07:00                   -
  WORKS - v15.0.0-nightly202007101237955d41/                 10-Jul-2020 07:00                   -
  v15.0.0-nightly20200711c176d5fac2/                 11-Jul-2020 07:00                   -
  v15.0.0-nightly20200712ac6ecd6b7f/                 12-Jul-2020 07:00                   -
  v15.0.0-nightly20200714c7627da837/                 14-Jul-2020 08:00                   -
  v15.0.0-nightly202007153b130327fa/                 15-Jul-2020 08:00                   -
  v15.0.0-nightly20200716d46fc91be4/                 16-Jul-2020 08:00                   -
  WORKS - v15.0.0-nightly20200717bf0d82c102/                 17-Jul-2020 08:00                   -
  DOES NOT WORK - v15.0.0-nightly202007187a447bcd54/                 18-Jul-2020 07:30                   -
  DOES NOT WORK - v15.0.0-nightly202007190c81cadec6/                 19-Jul-2020 08:30                   -
  NO BINARY FOR MACOS - v15.0.0-nightly20200720a51436cbea/                 20-Jul-2020 06:30                   -
  v15.0.0-nightly202007212c05beeb54/                 21-Jul-2020 08:00                   -
  v15.0.0-nightly20200722b0b52b2023/                 22-Jul-2020 09:00                   -
  DOES NOT WORK - v15.0.0-nightly2020072341c1e72b76/                 23-Jul-2020 09:00                   -
  v15.0.0-nightly20200724d1e4e8eaba/                 24-Jul-2020 07:30                   -
  v15.0.0-nightly20200725de192246bc/                 25-Jul-2020 07:00                   -
  v15.0.0-nightly2020072631ba9a20bd/                 26-Jul-2020 07:00                   -
  v15.0.0-nightly20200727db54b57042/                 27-Jul-2020 07:00                   -
  v15.0.0-nightly202007286fd09e4f36/                 28-Jul-2020 07:00                   -
  v15.0.0-nightly20200729360bf9b289/                 29-Jul-2020 08:30                   -
  v15.0.0-nightly202007301fe39f0b4b/                 30-Jul-2020 08:30                   -
  v15.0.0-nightly20200731dc00a07426/                 31-Jul-2020 07:00                   -
  v15.0.0-nightly20200801cc7ec889e8/                 01-Aug-2020 07:00                   -
  v15.0.0-nightly2020080273d713b16e/                 02-Aug-2020 07:00                   -
  v15.0.0-nightly20200803a9c5b873ca/                 03-Aug-2020 07:00                   -
  v15.0.0-nightly2020080474df7496ff/                 04-Aug-2020 07:00                   -
  v15.0.0-nightly2020080584b35b2867/                 05-Aug-2020 07:00                   -
  v15.0.0-nightly20200806df17fcdc71/                 06-Aug-2020 07:00                   -
  v15.0.0-nightly2020080746bef7b771/                 07-Aug-2020 07:00                   -
  v15.0.0-nightly20200808ac5773b1c3/                 08-Aug-2020 08:30                   -
  v15.0.0-nightly202008098825eb4d73/                 09-Aug-2020 07:00                   -
  v15.0.0-nightly20200810dd0c5228ac/                 10-Aug-2020 08:00                   -
  v15.0.0-nightly20200811f8a0e62bbf/                 11-Aug-2020 07:00                   -
  v15.0.0-nightly202008122f27f1144e/                 12-Aug-2020 08:30                   -
  v15.0.0-nightly202008137a1220a1d7/                 17-Aug-2020 22:30                   -
  v15.0.0-nightly202008145864fca7bc/                 17-Aug-2020 22:30                   -
  v15.0.0-nightly202008158da8ec9c7e/                 17-Aug-2020 22:30                   -
  v15.0.0-nightly20200816375b859428/                 17-Aug-2020 22:30                   -
  v15.0.0-nightly2020081742a3a7f97d/                 17-Aug-2020 23:00                   -
  v15.0.0-nightly20200818ca5ff723d1/                 21-Aug-2020 22:30                   -
  v15.0.0-nightly202008196e97a735c8/                 21-Aug-2020 23:00                   -
  v15.0.0-nightly2020082003293aa3a1/                 21-Aug-2020 23:00                   -
  v15.0.0-nightly202008217aeff6b8c8/                 21-Aug-2020 23:00                   -
  v15.0.0-nightly2020082244e6a6af67/                 22-Aug-2020 08:30                   -
  v15.0.0-nightly202008238e8d429277/                 23-Aug-2020 08:30                   -
  v15.0.0-nightly20200824c3d337db5d/                 24-Aug-2020 09:00                   -
  v15.0.0-nightly20200825010383a174/                 25-Aug-2020 08:30                   -
  v15.0.0-nightly20200826c6b96895cc/                 26-Aug-2020 09:00                   -
  v15.0.0-nightly202008278ec3b55e5b/                 27-Aug-2020 08:30                   -
  v15.0.0-nightly202008280848f56cb3/                 28-Aug-2020 08:30                   -
  v15.0.0-nightly2020082994fcac7876/                 29-Aug-2020 08:30                   -
  v15.0.0-nightly202008305c020762bb/                 30-Aug-2020 07:30                   -
  v15.0.0-nightly20200831e1edd6bbfa/                 31-Aug-2020 07:30                   -
  v15.0.0-nightly2020090159cad32b51/                 01-Sep-2020 07:30                   -
  v15.0.0-nightly20200902e2ffa454d3/                 02-Sep-2020 07:00                   -
  v15.0.0-nightly20200903b23a932bfd/                 03-Sep-2020 08:30                   -
  v15.0.0-nightly202009043b925219c3/                 04-Sep-2020 08:30                   -
  v15.0.0-nightly20200905186230527b/                 05-Sep-2020 08:30                   -
  v15.0.0-nightly20200906e326c41fbc/                 08-Sep-2020 12:00                   -
  v15.0.0-nightly20200907bb9117ee9f/                 08-Sep-2020 12:30                   -
  v15.0.0-nightly202009086f2af08245/                 08-Sep-2020 12:30                   -
  v15.0.0-nightly202009091204400d64/                 09-Sep-2020 08:30                   -
  v15.0.0-nightly202009104c9b79ed5a/                 10-Sep-2020 07:00                   -
  v15.0.0-nightly202009114f176c9110/                 11-Sep-2020 07:30                   -
  v15.0.0-nightly20200912541d296d56/                 12-Sep-2020 08:30                   -
  v15.0.0-nightly20200913b123e0806f/                 13-Sep-2020 07:00                   -
  v15.0.0-nightly202009149d12c14b19/                 14-Sep-2020 07:00                   -
  v15.0.0-nightly202009152b3eb101b5/                 15-Sep-2020 07:30                   -
  v15.0.0-nightly202009169cf9e4aebc/                 16-Sep-2020 08:30                   -
  v15.0.0-nightly2020091718462e0c1d/                 17-Sep-2020 08:30                   -
  v15.0.0-nightly202009182d868fe822/                 18-Sep-2020 07:30                   -
  v15.0.0-nightly2020091931b3202d59/                 19-Sep-2020 08:00                   -
  v15.0.0-nightly20200920770ad3a52d/                 20-Sep-2020 08:30                   -
  v15.0.0-nightly20200921039c274dde/                 21-Sep-2020 09:00                   -
  v15.0.0-nightly20200922d71b467bbe/                 22-Sep-2020 08:30                   -
  v15.0.0-nightly202009233b10f7f933/                 23-Sep-2020 07:00                   -
  v15.0.0-nightly20200924d6fe46f749/                 25-Sep-2020 11:30                   -
  v15.0.0-nightly20200925785a5f9ae1/                 25-Sep-2020 11:30                   -
  v15.0.0-nightly20200926aa99bb47bf/                 26-Sep-2020 08:00                   -
  v15.0.0-nightly20200927af92317909/                 27-Sep-2020 09:00                   -
  v15.0.0-nightly202009286fc3b0ddb9/                 28-Sep-2020 08:00                   -
  v15.0.0-nightly202009291e8cb08edc/                 29-Sep-2020 07:30                   -
  v15.0.0-nightly20200930ee9e3e75aa/                 30-Sep-2020 08:30                   -
  v15.0.0-nightly20201001726143e683/                 01-Oct-2020 07:00                   -
  v15.0.0-nightly202010024a6005c56a/                 02-Oct-2020 07:00                   -
  v15.0.0-nightly20201003e7bb8b6dc0/                 03-Oct-2020 08:00                   -
  v15.0.0-nightly20201004e6d5af3c95/                 04-Oct-2020 08:30                   -
  v15.0.0-nightly202010055e605c0dd9/                 05-Oct-2020 09:00                   -
  v15.0.0-nightly20201006642f2064c0/                 06-Oct-2020 08:00                   -
  v15.0.0-nightly20201007bc0c094b74/                 07-Oct-2020 07:00                   -
  v15.0.0-nightly20201008ccc822c7c8/                 08-Oct-2020 07:00                   -
  v15.0.0-nightly20201009c8b950a7af/                 09-Oct-2020 07:00                   -
  v15.0.0-nightly202010108d8e06a345/                 10-Oct-2020 07:00                   -
  v15.0.0-nightly2020101191e0d9bc30/                 11-Oct-2020 07:00                   -
  v15.0.0-nightly202010122d83e743d9/                 12-Oct-2020 07:00                   -
  v15.0.0-nightly2020101344a66adbaa/                 13-Oct-2020 07:00                   -
  v15.0.0-nightly20201014d5e64952fe/                 14-Oct-2020 08:30                   -
  v15.0.0-nightly202010154079bfd462/                 15-Oct-2020 21:00                   -
  v15.0.0-nightly20201016c143266b55/                 16-Oct-2020 07:00                   -
  v15.0.0-nightly20201017a3731309cc/                 17-Oct-2020 11:00                   -
  v15.0.0-nightly20201018ee85eb9f8a/                 18-Oct-2020 07:30                   -
  v15.0.0-nightly20201019c55f661551/                 19-Oct-2020 07:00                   -
  v15.0.0-nightly2020102011f1ad939f/                 20-Oct-2020 07:00                   -
  DOES NOT WORK - v16.0.0-nightly20201021c2ceb15fd5/                 21-Oct-2020 07:00                   -
  ```
</details>

Please view [Other Places This Issue is Mentioned](#Other-Places-This-Issue-is-Mentioned) for more information on this issue and a GIF demonstration of the issue.

@joyeecheung
@addaleax

[n version manager]: https://github.com/tj/n
[Node.js nightly]: https://nodejs.org/download/nightly/
[comparison on GitHub]: https://github.com/nodejs/node/compare/bf0d82c102...7a447bcd54
[Node.js source code]: https://github.com/nodejs/node

# Other Places This Issue is Mentioned
- https://github.com/nodejs/diagnostics/issues/455
- https://github.com/nodejs/help/issues/3104
- https://stackoverflow.com/questions/65113609/node-js-breakpoints-not-working-on-modules