Crawler getting stuck on Page Crashed

[benoit74]

Kiwix has a crawler which got stuck without returning, with 0.11.1 (i.e. with #385 merged). A last log is output and then process is still up but nothing more seems to be happening.

Launch command (note that I modified the userAgentSuffix):

Running browsertrix-crawler crawl: crawl --failOnFailedSeed --waitUntil load --title Plotly Documentation --depth -3 --timeout 90 --scopeType domain --behaviors autoplay,autofetch,siteSpecific --behaviorTimeout 90 --sizeLimit 4294967296 --diskUtilization 90 --timeLimit 7200 --url https://plotly.com/python/ --userAgentSuffix [email protected] --cwd /output/.tmpq4knpe8p --statsFilename /output/crawl.json

Version log line:

{"timestamp":"2023-09-20T01:40:03.312Z","logLevel":"info","context":"general","message":"Browsertrix-Crawler 0.11.1 (with warcio.js 1.6.2 pywb 2.7.4)","details":{}}

Last log line is:

{"timestamp":"2023-09-20T03:01:59.247Z","logLevel":"error","context":"worker","message":"Page Crashed","details":{"type":"exception","message":"Page crashed!","stack":"Error: Page crashed!\n    at #onTargetCrashed (file:///app/node_modules/puppeteer-core/lib/esm/puppeteer/common/Page.js:284:28)\n    at file:///app/node_modules/puppeteer-core/lib/esm/puppeteer/common/Page.js:153:41\n    at file:///app/node_modules/puppeteer-core/lib/esm/third_party/mitt/index.js:1:248\n    at Array.map (<anonymous>)\n    at Object.emit (file:///app/node_modules/puppeteer-core/lib/esm/third_party/mitt/index.js:1:232)\n    at CDPSessionImpl.emit (file:///app/node_modules/puppeteer-core/lib/esm/puppeteer/common/EventEmitter.js:82:22)\n    at CDPSessionImpl._onMessage (file:///app/node_modules/puppeteer-core/lib/esm/puppeteer/common/Connection.js:425:18)\n    at Connection.onMessage (file:///app/node_modules/puppeteer-core/lib/esm/puppeteer/common/Connection.js:255:25)\n    at WebSocket.<anonymous> (file:///app/node_modules/puppeteer-core/lib/esm/puppeteer/common/NodeWebSocketTransport.js:46:32)\n    at callListener (/app/node_modules/puppeteer-core/node_modules/ws/lib/event-target.js:290:14)","page":"https://plotly.com/python/3d-surface-plots/","workerid":0}}

Do not hesitate to ask if more info is needed.

[benoit74]

youzim.it task: https://farm.youzim.it/pipeline/1d123407-0aa3-4094-8355-c59cd5a41c52

[ikreymer]

Thanks for the report, will try to repro. It should have been able to continue after the page crash.

[ikreymer]

This has hopefully been fixed in 0.11.2 - very hard to be 100% sure, but hopefully won't happen again.

[benoit74]

Some good and some bad news on this topic.

I confirm the crawler is now continuing after a page crash. That's great.

It however looks like we have new situations (with 0.12.3 and 0.12.4) around page crashes.

Details are present in openzim/zimit#266 and openzim/zimit#283

• it looks like once a page has crashed, it will continue to happen for other pages (some will be successful but we will encounter new crashes)
• it usually get so bad that we face a new issue (timeout at page initialization if I read the log properly) which stops the crawler (but the crawler exits properly now)
• the issue happens on few websites, most of our recipes are still running fine ; for unknown reasons https://solar.lowtechmagazine.com/ seems to be a good test website to experience these crashes
• on two occasions (which led to the creation of solar.lowtechmagazine.com is very unstable openzim/zimit#283), the final symptoms were a bit different but after investigation I consider the root cause might be identical

Help or any suggestion on what to test to progress on this topic would be welcomed. Most important topic for us is probably the new situations of openzim/zimit#283 were the crawler seems to return code 11 while indeed it has faced a critical situation, not a limit. This is a problem for us because we consider that hitting a limit is "normal" and we should continue processing by creating our ZIM. It is more serious than real crawler crashes because we are not alerted of the issue. If it is easy to identify and fix what led the crawler to "believe" it hits a limit, it would be a great enhancement.

One side-question: is it possible to ask the crawler to stop on first page crash (instead of trying to continue)?

[benoit74]

I confirm that crawler 1.x seems to have solved this issue.

Thank you all for the very great work that has been pushed into 1.x release(s)!