chrome-headless zombie processes

[fbartels]

Hi,
I am currently debugging a wordpress installation which seems to drag my server down. While debugging i noticed that i had quite some zombie processes which seem to originate from the Linkwarden app. Has anybody else observed something similar?

You can see if you have any by running ps -eo pid,ppid,stat,comm | grep '^.* Z'?

[necrevistonnezr]

Yep, the same here, 126 zombie processes:

ps -eo pid,ppid,stat,comm | grep '^.* Z'
1284559  573613 Z    chrome
2434952 2434670 Z    chrome-headless
2434953 2434670 Z    chrome-headless
2439391 2434670 Z    chrome-headless
2439392 2434670 Z    chrome-headless
2448245 2434670 Z    chrome-headless
2448246 2434670 Z    chrome-headless
2535715 2434670 Z    chrome-headless
2535716 2434670 Z    chrome-headless
2540346 2434670 Z    chrome-headless
2540347 2434670 Z    chrome-headless
2544561 2434670 Z    chrome-headless
2544562 2434670 Z    chrome-headless
2549203 2434670 Z    chrome-headless
2549204 2434670 Z    chrome-headless
2553805 2434670 Z    chrome-headless
2553806 2434670 Z    chrome-headless
2558888 2434670 Z    chrome-headless
2558889 2434670 Z    chrome-headless
2563340 2434670 Z    chrome-headless
2563341 2434670 Z    chrome-headless
2568025 2434670 Z    chrome-headless
2568026 2434670 Z    chrome-headless
2572565 2434670 Z    chrome-headless
2572566 2434670 Z    chrome-headless
2576961 2434670 Z    chrome-headless
2576962 2434670 Z    chrome-headless
2581375 2434670 Z    chrome-headless
2581376 2434670 Z    chrome-headless
2621371 2434670 Z    chrome-headless
2621373 2434670 Z    chrome-headless
2667593 2434670 Z    chrome-headless
2667594 2434670 Z    chrome-headless
2672464 2434670 Z    chrome-headless
2672465 2434670 Z    chrome-headless
2676666 2434670 Z    chrome-headless
2676667 2434670 Z    chrome-headless
2684143 2434670 Z    chrome-headless
2684144 2434670 Z    chrome-headless
2688747 2434670 Z    chrome-headless
2688748 2434670 Z    chrome-headless
2693221 2434670 Z    chrome-headless
2693222 2434670 Z    chrome-headless
2697664 2434670 Z    chrome-headless
2697665 2434670 Z    chrome-headless
2702339 2434670 Z    chrome-headless
2702340 2434670 Z    chrome-headless
2706915 2434670 Z    chrome-headless
2706916 2434670 Z    chrome-headless
2711296 2434670 Z    chrome-headless
2711297 2434670 Z    chrome-headless
2715849 2434670 Z    chrome-headless
2715850 2434670 Z    chrome-headless
2721351 2434670 Z    chrome-headless
2721352 2434670 Z    chrome-headless
2725678 2434670 Z    chrome-headless
2725679 2434670 Z    chrome-headless
2730832 2434670 Z    chrome-headless
2730833 2434670 Z    chrome-headless
2735034 2434670 Z    chrome-headless
2735035 2434670 Z    chrome-headless
2740108 2434670 Z    chrome-headless
2740109 2434670 Z    chrome-headless
2744687 2434670 Z    chrome-headless
2744688 2434670 Z    chrome-headless
2749550 2434670 Z    chrome-headless
2749551 2434670 Z    chrome-headless
2753939 2434670 Z    chrome-headless
2753940 2434670 Z    chrome-headless
2758552 2434670 Z    chrome-headless
2758553 2434670 Z    chrome-headless
2763169 2434670 Z    chrome-headless
2763170 2434670 Z    chrome-headless
2767550 2434670 Z    chrome-headless
2767551 2434670 Z    chrome-headless
2771957 2434670 Z    chrome-headless
2771958 2434670 Z    chrome-headless
2853959 2434670 Z    chrome-headless
2853960 2434670 Z    chrome-headless
2858291 2434670 Z    chrome-headless
2858292 2434670 Z    chrome-headless
2863010 2434670 Z    chrome-headless
2863011 2434670 Z    chrome-headless
2867235 2434670 Z    chrome-headless
2867236 2434670 Z    chrome-headless
2871813 2434670 Z    chrome-headless
2871814 2434670 Z    chrome-headless
2876390 2434670 Z    chrome-headless
2876391 2434670 Z    chrome-headless
2880780 2434670 Z    chrome-headless
2880781 2434670 Z    chrome-headless
2885178 2434670 Z    chrome-headless
2885179 2434670 Z    chrome-headless
2889765 2434670 Z    chrome-headless
2889766 2434670 Z    chrome-headless
2894335 2434670 Z    chrome-headless
2894336 2434670 Z    chrome-headless
2899002 2434670 Z    chrome-headless
2899003 2434670 Z    chrome-headless
2903485 2434670 Z    chrome-headless
2903486 2434670 Z    chrome-headless
2908861 2434670 Z    chrome-headless
2908862 2434670 Z    chrome-headless
2999640 2434670 Z    chrome-headless
2999641 2434670 Z    chrome-headless
3004238 2434670 Z    chrome-headless
3004239 2434670 Z    chrome-headless
3008485 2434670 Z    chrome-headless
3008486 2434670 Z    chrome-headless
3013017 2434670 Z    chrome-headless
3013018 2434670 Z    chrome-headless
3017664 2434670 Z    chrome-headless
3017665 2434670 Z    chrome-headless
3022012 2434670 Z    chrome-headless
3022013 2434670 Z    chrome-headless
3026560 2434670 Z    chrome-headless
3026561 2434670 Z    chrome-headless
3031199 2434670 Z    chrome-headless
3031200 2434670 Z    chrome-headless
3035771 2434670 Z    chrome-headless
3035772 2434670 Z    chrome-headless
3040113 2434670 Z    chrome-headless
3040114 2434670 Z    chrome-headless
3044619 2434670 Z    chrome-headless
3044620 2434670 Z    chrome-headless
3047759  573613 Z    chrome
3127211 2434670 Z    chrome-headless
3127212 2434670 Z    chrome-headless

After stopping the Linkwarden app:

ps -eo pid,ppid,stat,comm | grep '^.* Z'
1284559  573613 Z    chrome
3047759  573613 Z    chrome

[robi]

How much memory is default?

Any OOM messages in the logs?

[james]

This might be a known issue: https://github.com/prerender/prerender/issues/539

[necrevistonnezr]

@james said in chrome-headless zombie processes:

This might be a known issue: https://github.com/prerender/prerender/issues/539

That’s an issue from 2018?!

[girish]

Linkwarden uses playwright internally to create an archive. There's some issues in playwright around this like:

• https://github.com/microsoft/playwright/issues/34190
• https://github.com/microsoft/playwright-java/issues/876
• https://github.com/microsoft/playwright-python/issues/984
• https://github.com/windmill-labs/windmill/issues/6048

There is no definitive answer afaict but it seems a workaround is have docker container run dumb init which cleans up the zombies .

Unrelated: Seem there is MAX_WORKERS (default unlimited). The default app memory limit is 1GB .

[girish]

I added dumb-init to the package. I can't reproduce the issue myself, so no idea if this is going to work - https://git.cloudron.io/packages/linkwarden-app/-/merge_requests/55