1904897 - Enabling the profiler with the JS feature leaks an 8-byte JavaScript object in `browser_test_feature_multiprocess_capture_with_signal.js`

Status: NEW

(Core :: Gecko Profiler, defect)

Description

[Adam Brouwers-Harries [:aabh] [he/him] ⌚GMT]

Enabling the "JS" feature in the profiler causes Firefox to leak 8 bytes of memory in the form of a JavaScript object, while running the test browser_test_feature_multiprocess_capture_with_signal.js. This causes failures when run with the leakchecker.

It's likely that this is related to Bug 1699681, but it has its own bug as the resulting leak is slightly different.

Comment 1

[Adam Brouwers-Harries [:aabh] [he/him] ⌚GMT]

An example leakcheck output is as follows:

[task 2024-06-25T21:34:48.777Z] 21:34:48     INFO - leakcheck | Processing leak log file /tmp/tmp9s848yjx.mozrunner/runtests_leaks.log
[task 2024-06-25T21:34:48.778Z] 21:34:48     INFO - 
[task 2024-06-25T21:34:48.779Z] 21:34:48     INFO - == BloatView: ALL (cumulative) LEAK AND BLOAT STATISTICS, default process 2450
[task 2024-06-25T21:34:48.780Z] 21:34:48     INFO - 
[task 2024-06-25T21:34:48.780Z] 21:34:48     INFO -      |<----------------Class--------------->|<-----Bytes------>|<----Objects---->|
[task 2024-06-25T21:34:48.781Z] 21:34:48     INFO -      |                                      | Per-Inst   Leaked|   Total      Rem|
[task 2024-06-25T21:34:48.782Z] 21:34:48     INFO -    0 |TOTAL                                 |       43        8| 1260556        1|
[task 2024-06-25T21:34:48.783Z] 21:34:48     INFO -  553 |JS Object                             |        8        8|       1        1|
[task 2024-06-25T21:34:48.784Z] 21:34:48     INFO - 
[task 2024-06-25T21:34:48.784Z] 21:34:48     INFO - nsTraceRefcnt::DumpStatistics: 2168 entries
[task 2024-06-25T21:34:48.784Z] 21:34:48     INFO - TEST-INFO | leakcheck | default leaked 1 JS Object
[task 2024-06-25T21:34:48.784Z] 21:34:48     INFO - TEST-UNEXPECTED-FAIL | leakcheck | default 8 bytes leaked (JS Object)
[task 2024-06-25T21:34:48.784Z] 21:34:48     INFO - 

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

The severity field is not set for this bug.
:canova, could you have a look please?

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