Fix orphaned crashpad_handler processes after Android emulator stop by Copilot · Pull Request #48 · dotnet/maui-labs

Copilot · 2026-03-31T16:34:58Z

maui android emulator stop kills the main qemu-system-aarch64 process via ADB but leaves its crashpad_handler children orphaned (reparented to PID 1). These accumulate ~5 MB each over repeated start/stop cycles.

Approach

Capture the emulator's child PIDs before issuing the ADB stop, then kill any survivors after it completes:

// AndroidProvider.StopEmulatorAsync
var emulatorPid = EmulatorProcessHelper.FindEmulatorProcessId(deviceSerial);
IReadOnlyList<int> childPids = emulatorPid.HasValue
    ? EmulatorProcessHelper.GetChildProcessIds(emulatorPid.Value)
    : Array.Empty<int>();

await _adb.StopEmulatorAsync(deviceSerial, cancellationToken);

if (childPids.Count > 0)
    EmulatorProcessHelper.KillProcessIds(childPids);

New: `EmulatorProcessHelper`

Internal static helper with two layers:

Pure parsing methods (testable, no I/O) — parse ps output to map PIDs to parents, identify the qemu-system-* process for a given serial's console port (matching -port XXXX and @XXXX arg formats), and enumerate direct children
Platform operation methods (macOS/Linux only; no-op on Windows and on any error) — run ps -eo pid,args / ps -eo pid,ppid, return discovered PIDs, kill survivors with per-process error isolation

Tests

17 unit tests covering port extraction, ps output parsing, qemu PID matching (both -port and @port formats, multiple simultaneous emulators), and child PID enumeration.

Warning

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I tried to connect to the following addresses, but was blocked by firewall rules:

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Pull request overview

This PR addresses a resource leak in the MAUI CLI’s Android emulator stop flow where adb emu kill stops the main qemu-system-* process but can leave crashpad_handler (and potentially other) child processes orphaned, accumulating memory over repeated cycles.

Changes:

Add EmulatorProcessHelper utilities to find the emulator’s QEMU PID, enumerate its direct child PIDs, and terminate remaining child processes after shutdown (macOS/Linux only).
Update AndroidProvider.StopEmulatorAsync to snapshot child PIDs before stopping the emulator and kill survivors afterward.
Add unit tests covering port parsing, ps output parsing, QEMU PID matching, and child PID enumeration.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/Cli/Microsoft.Maui.Cli/Utils/EmulatorProcessHelper.cs	New helper to locate emulator QEMU process, enumerate child PIDs, and kill remaining child processes post-stop.
src/Cli/Microsoft.Maui.Cli/Providers/Android/AndroidProvider.cs	Hooks the helper into `StopEmulatorAsync` to clean up orphaned child processes.
src/Cli/Microsoft.Maui.Cli.UnitTests/EmulatorProcessHelperTests.cs	Adds unit coverage for parsing and PID matching/enumeration behavior.

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Copilot · 2026-04-01T22:59:22Z

src/Cli/Microsoft.Maui.Cli/Utils/EmulatorProcessHelper.cs

+		{
+			try
+			{
+				using var process = Process.GetProcessById(pid);
+				process.Kill(entireProcessTree: false);


KillProcessIds terminates processes solely by PID captured earlier. If a child exits during shutdown and its PID gets reused before this loop runs, this can kill an unrelated process. Consider re-validating each PID before killing (e.g., re-query pid→ppid and/or verify the command line still matches expected emulator child processes like crashpad_handler).

Initial plan

9c8e3d6

Copilot AI assigned Copilot and rmarinho Mar 31, 2026

Copilot started work on behalf of rmarinho March 31, 2026 16:35 View session

Copilot AI linked an issue Mar 31, 2026 that may be closed by this pull request

[MAUI CLI] Orphaned crashpad_handler processes after emulator stop #47

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Fix orphaned crashpad_handler processes after emulator stop

0df926d

Agent-Logs-Url: https://github.com/dotnet/maui-labs/sessions/032d6d01-0b08-42fd-9d01-9d29d40ab597 Co-authored-by: rmarinho <1235097+rmarinho@users.noreply.github.com>

Copilot AI changed the title ~~[WIP] Fix orphaned crashpad_handler processes after emulator stop~~ Fix orphaned crashpad_handler processes after Android emulator stop Mar 31, 2026

Copilot finished work on behalf of rmarinho March 31, 2026 16:53

Copilot AI requested a review from rmarinho March 31, 2026 16:53

Merge branch 'main' into copilot/fix-orphaned-crashpad-handler-processes

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rmarinho marked this pull request as ready for review April 1, 2026 22:55

Copilot AI review requested due to automatic review settings April 1, 2026 22:56

Copilot started reviewing on behalf of rmarinho April 1, 2026 22:56 View session

Copilot AI reviewed Apr 1, 2026

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Fix orphaned crashpad_handler processes after Android emulator stop#48

Fix orphaned crashpad_handler processes after Android emulator stop#48
Copilot wants to merge 3 commits intomainfrom
copilot/fix-orphaned-crashpad-handler-processes

Copilot AI commented Mar 31, 2026 •

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Copilot AI commented Mar 31, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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New: EmulatorProcessHelper

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Copilot AI commented Mar 31, 2026 •

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New: `EmulatorProcessHelper`