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Occasional TCP.get errors causing failing specs since updating to Cypress 10

See original GitHub issue

Current behavior

I’m very confused by a Cypress/lodash error I’ve been encountering since updating to Cypress 10. The end result is that the test fails and the job times out on the Cypress Dashboard.

No screenshots or recording because the spec never completed. Here’s the Cypress Dashboard error message:

And the lack of video/screenshots: Screenshot 2022-06-17 at 15 57 59

We’re running our tests via Jenkins, with orchestration courtesy of the Cypress Dashboard. Here’s the output for one of the affected jobs:

12:20:37  Cannot read properties of null (reading 'reading')
12:20:37  TypeError: Cannot read properties of null (reading 'reading')
12:20:37      at TCP.get [as reading] (node:_tls_wrap:634:27)
12:20:37      at /app/.cache/Cypress/10.0.2/Cypress/resources/app/node_modules/lodash/lodash.js:2730:27
12:20:37      at arrayEach (/app/.cache/Cypress/10.0.2/Cypress/resources/app/node_modules/lodash/lodash.js:530:11)
12:20:37      at baseClone (/app/.cache/Cypress/10.0.2/Cypress/resources/app/node_modules/lodash/lodash.js:2727:7)
12:20:37      at /app/.cache/Cypress/10.0.2/Cypress/resources/app/node_modules/lodash/lodash.js:2733:34
12:20:37      at arrayEach (/app/.cache/Cypress/10.0.2/Cypress/resources/app/node_modules/lodash/lodash.js:530:11)
12:20:37      at baseClone (/app/.cache/Cypress/10.0.2/Cypress/resources/app/node_modules/lodash/lodash.js:2727:7)
12:20:37      at /app/.cache/Cypress/10.0.2/Cypress/resources/app/node_modules/lodash/lodash.js:2733:34
12:20:37      at arrayEach (/app/.cache/Cypress/10.0.2/Cypress/resources/app/node_modules/lodash/lodash.js:530:11)
12:20:37      at baseClone (/app/.cache/Cypress/10.0.2/Cypress/resources/app/node_modules/lodash/lodash.js:2727:7)
12:20:37      at /app/.cache/Cypress/10.0.2/Cypress/resources/app/node_modules/lodash/lodash.js:2733:34
12:20:37      at arrayEach (/app/.cache/Cypress/10.0.2/Cypress/resources/app/node_modules/lodash/lodash.js:530:11)
12:20:37      at baseClone (/app/.cache/Cypress/10.0.2/Cypress/resources/app/node_modules/lodash/lodash.js:2727:7)
12:20:37      at /app/.cache/Cypress/10.0.2/Cypress/resources/app/node_modules/lodash/lodash.js:2733:34
12:20:37      at arrayEach (/app/.cache/Cypress/10.0.2/Cypress/resources/app/node_modules/lodash/lodash.js:530:11)
12:20:37      at baseClone (/app/.cache/Cypress/10.0.2/Cypress/resources/app/node_modules/lodash/lodash.js:2727:7)
12:20:37      at Function.cloneDeep (/app/.cache/Cypress/10.0.2/Cypress/resources/app/node_modules/lodash/lodash.js:11156:14)
12:20:37      at HttpBuffers.set (/app/.cache/Cypress/10.0.2/Cypress/resources/app/packages/proxy/lib/http/util/buffers.js:26:32)
12:20:37      at Http.setBuffer (/app/.cache/Cypress/10.0.2/Cypress/resources/app/packages/proxy/lib/http/index.js:221:29)
12:20:37      at NetworkProxy.setHttpBuffer (/app/.cache/Cypress/10.0.2/Cypress/resources/app/packages/proxy/lib/network-proxy.js:19:19)
12:20:37      at /app/.cache/Cypress/10.0.2/Cypress/resources/app/packages/server/lib/server-e2e.js:248:103
12:20:37      at /app/.cache/Cypress/10.0.2/Cypress/resources/app/packages/network/lib/concat-stream.js:22:16
12:20:37      at ConcatStream.<anonymous> (/app/.cache/Cypress/10.0.2/Cypress/resources/app/node_modules/concat-stream/index.js:37:43)
12:20:37      at ConcatStream.emit (node:events:402:35)
12:20:37      at ConcatStream.emit (node:domain:475:12)
12:20:37      at finishMaybe (/app/.cache/Cypress/10.0.2/Cypress/resources/app/node_modules/readable-stream/lib/_stream_writable.js:630:14)
12:20:37      at endWritable (/app/.cache/Cypress/10.0.2/Cypress/resources/app/node_modules/readable-stream/lib/_stream_writable.js:638:3)
12:20:37      at ConcatStream.Writable.end (/app/.cache/Cypress/10.0.2/Cypress/resources/app/node_modules/readable-stream/lib/_stream_writable.js:594:41)
12:20:37      at Duplexify.onend (/app/.cache/Cypress/10.0.2/Cypress/resources/app/packages/server/node_modules/readable-stream/lib/_stream_readable.js:646:10)
12:20:37      at Object.onceWrapper (node:events:509:28)
12:20:37      at Duplexify.emit (node:events:390:28)
12:20:37      at Duplexify.emit (node:domain:475:12)
12:20:37      at endReadableNT (/app/.cache/Cypress/10.0.2/Cypress/resources/app/packages/server/node_modules/readable-stream/lib/_stream_readable.js:1094:12)
12:20:37      at processTicksAndRejections (node:internal/process/task_queues:83:21)
12:20:37      at runNextTicks (node:internal/process/task_queues:65:3)
12:20:37      at processImmediate (node:internal/timers:437:9)

I don’t use lodash at all in my Cypress tests. And given that this started after updating to Cypress 10, I don’t believe the issue is due to the specs themselves.

In the stack trace above, I see mentions of Duplexify. We definitely aren’t using that in our tests, so I suspect that this is something to do with refactored video/screenshot upload logic in the newest Cypress

Just a hunch, but I noticed that this file changed recently. It’s mentioned in the stack trace and it also uses lodash. Could it be something to do with that?

Desired behavior

Desired outcome would be to no longer have this issue affecting our Jenkins runs and timing out on the Cypress Dashboard

Test code to reproduce

It’ll be difficult for me to provide a reproducible example, as the issue seems dependent on Cypress’ TCP.get not receiving a response from Cypress Dashboard.

I’d be happy to turn on debugging for one of our Jenkins jobs so that you have some more information, though. Just let me know what to add to give you the info you need, and I’ll email it to Cypress.