INFRA Signal 96
FreeBSD kernel now returns extended error messages to improve diagnostics
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The FreeBSD kernel now returns extended error messages, a facility added in May 2025 ahead of the 15.0 release to reduce the terseness of overloaded error codes.
Engineers can obtain more specific failure information without relying on ambiguous error codes, which simplifies debugging. This reduces the need to consult external documentation or guess the cause of common errors.
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The extended error messages facility was added to the FreeBSD kernel in May 2025.
It was introduced shortly before the FreeBSD 15.0 release.
Its purpose is to reduce the terseness of commonly overloaded error codes such as EI...
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The feed summary states that the FreeBSD kernel now returns extended error messages. This capability was added in May 2025, shortly before the 15.0 release. The summary notes that the goal of the feature is to reduce the terseness of overloaded error codes.
The summary does not describe how developers or system administrators must modify their software to take advantage of the extended messages. It also does not mention any required kernel configuration steps or performance overhead. Consequently, the material provides no basis for estimating the cost of adoption.
Likewise, the feed gives no information about scenarios in which the extended error messages might not be available or might be truncated. There is no mention of backward-compatibility limits or conditions under which the facility could fail. Therefore, the supplied material does not allow us to say where the feature stops working.
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