Sql/tests: TestRandomSyntaxFunctions Failed

May 9, 2025 by ADMIN 44 views

Introduction

The CockroachDB team has encountered a test failure in the sql/tests suite, specifically in the TestRandomSyntaxFunctions test. This test is designed to randomly generate SQL syntax and execute it on the CockroachDB server. However, the test has failed on the release-25.2.0-rc branch, indicating a potential issue with the server's ability to handle random SQL syntax.

Test Failure Details

The test failure is reported on the CockroachDB TeamCity build server, with a link to the build log and artifacts. The failure is attributed to a server panic caused by a statement execution timeout. The specific error message is:

    rsg_test.go:964: Crash detected: server panic: statement exec timeout

Query that Caused the Failure

The query that caused the failure is a SELECT statement that uses the crdb_internal.fingerprint function. The function takes an array of BYTES, a TIMESTAMPTZ value, and a boolean flag as arguments. The query is as follows:

        SELECT crdb_internal.fingerprint(ARRAY['\x507ec3bffcef60':::BYTES,'\xca':::BYTES], '2003-12-08 18:20:06.0005+00':::TIMESTAMPTZ, false) ;

Investigation and Resolution

To investigate this issue, we need to understand the root cause of the server panic and the statement execution timeout. The CockroachDB team has provided a link to a knowledge base article on how to investigate a Go test failure. Additionally, the team has reported similar failures on other branches, indicating that the issue may be related to the TestRandomSyntaxFunctions test itself.

Related Issues

The CockroachDB team has reported similar failures on other branches, including:

#146422: sql/tests: TestRandomSyntaxFunctions failed on the branch-release-25.1.6-rc branch
#146421: sql/tests: TestRandomSyntaxFunctions failed on the branch-release-25.1 branch

Action Items

The CockroachDB team has assigned the issue to the sql-foundations team, and the following action items have been identified:

Investigate the root cause of the server panic and statement execution timeout
Review the TestRandomSyntaxFunctions test to identify any potential issues
Develop a fix for the issue and test it thoroughly

Additional Resources

For more information on how to investigate a Go test failure, please refer to the following knowledge base article:

How To Investigate a Go Test Failure ${internal}$

To view the test failure on RoachDash, please click on the following link:

This test on roachdash

To improve this report, please contribute to the CockroachDB GitHub repository:

Improve this report!

Jira Issue

Introduction

Q&A

Q: What is the TestRandomSyntaxFunctions test?

A: The TestRandomSyntaxFunctions test is a part of the CockroachDB sql/tests suite. It is designed to randomly generate SQL syntax and execute it on the CockroachDB server. The test is used to ensure that the server can handle a wide range of SQL syntax and that it does not crash or produce unexpected results.

Q: What is the error message that is being reported?

A: The error message being reported is a server panic caused by a statement execution timeout. The specific error message is:

    rsg_test.go:964: Crash detected: server panic: statement exec timeout

Q: What is the query that caused the failure?

A: The query that caused the failure is a SELECT statement that uses the crdb_internal.fingerprint function. The function takes an array of BYTES, a TIMESTAMPTZ value, and a boolean flag as arguments. The query is as follows:

        SELECT crdb_internal.fingerprint(ARRAY['\x507ec3bffcef60':::BYTES,'\xca':::BYTES], '2003-12-08 18:20:06.0005+00':::TIMESTAMPTZ, false) ;

Q: What are the possible causes of the server panic and statement execution timeout?

A: There are several possible causes of the server panic and statement execution timeout, including:

A bug in the CockroachDB server that causes it to crash or produce unexpected results when executing the query.
A problem with the query itself, such as a syntax error or a mismatch between the query and the data in the database.
A resource issue, such as a lack of memory or CPU resources, that causes the server to timeout or crash.

Q: How can I investigate this issue further?

A: To investigate this issue further, you can:

Review the CockroachDB logs to see if there are any error messages or other clues that can help you understand what is happening.
Use the CockroachDB debugging tools to step through the code and see where the server is crashing or producing unexpected results.
Try to reproduce the issue by running the query again and seeing if you can get the same error message.

Q: What are the next steps for resolving this issue?

A: The next steps for resolving this issue are:

Investigate the root cause of the server panic and statement execution timeout.
Review the TestRandomSyntaxFunctions test to identify any potential issues.
Develop a fix for the issue and test it thoroughly.

Q: How can I get involved in the investigation and resolution of this issue?

A: If you are interested in getting involved in the investigation and resolution of this issue, you can:

Review the CockroachDB code and documentation to see if you can identify any potential issues.
Try to reproduce the issue and provide feedback to the CockroachDB team.
Contribute to the CockroachDB GitHub repository to help fix the issue.