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Unfortunately, I find it very hard to pinpoint the cause of the issue. There's no error or warning in the logs. We only see incomplete responses for a very select few of our pages. The errors are very predictable. The same pages fail consistently. This makes me believe it's a logic error, not some sort of race condition.

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Unfortunately, I find it very hard to pinpoint the cause of the issue. There's no error or warning in the logs. We only see incomplete responses for a very select few of our pages. The errors are very predictable. The same pages fail consistently. This makes me believe it's a logic error, not some sort of race condition.
Git Pull Request:
https://github.com/undertow-io/undertow/pull/1683, https://github.com/undertow-io/undertow/pull/1687, https://github.com/undertow-io/undertow/pull/1689

After the upgrade to WildFly 33.0.2 (from 33.0.1) several of our tests started failing due to responses being abruptly ended. A git bisect revealed that https://github.com/undertow-io/undertow/commit/8e75dd3e3eafd91ecc7ed09b2ab9429992041752 is to blame, which is the fix for ~~UNDERTOW-2425~~. All revisions after this commit consistently cause our tests to fail.

is caused by

UNDERTOW-2425 io.undertow.servlet.spec.ServletPrintWriter.close() high CPU when encoding characters on previously errored writer

is incorporated by

JBEAP-28245 (8.0.z) UNDERTOW-2448 - Broken responses after UNDERTOW-2425

JBEAP-28246 (7.4.z) UNDERTOW-2448 - Broken responses after UNDERTOW-2425

WFCORE-7030 Upgrade Undertow from 2.3.17 to 2.3.18