Why Does My MySQL Query Trigger a 'Thread Stack Overrun' Error?

1436 - Thread Stack Overrun: Proper Resolution

The query you provided, which updates a simple table and triggers a straightforward trigger, encounters an error: "Thread stack overrun." Let's explore the underlying reasons and identify the appropriate solution.

Why the Error Occurs

The MySQL server allocates a specific amount of stack memory for each thread. In this case, the thread stack size is set to 131072 bytes. However, the execution of the update query and the trigger requires more than this allocated memory, leading to the error.

Finding the Root Cause

To determine the source of the error, consider the following:

• Default Thread Stack Size: By default, MySQL sets the thread stack size to 192KB (32-bit) or 256KB (64-bit).
• My.cnf Configuration: You may have modified the my.cnf file to adjust the thread_stack setting, which could result in a lower value.
• Custom Server Build: If you have built the MySQL server yourself, the thread_stack size may have been modified during compilation.

Resolving the Issue

The most straightforward solution is to increase the thread stack size. You can achieve this through the my.cnf configuration file by adding the following line:

[mysqld]
thread_stack = [new_stack_size_in_bytes]

Recommended values for the new stack size are:

• 32-bit systems: 512KB or higher
• 64-bit systems: 1MB or higher

Additional Notes

• You can use the performance_schema.variables_info table to determine where the current thread_stack value is coming from (COMPILED or EXPLICIT).
• Changing the thread_stack size requires a server restart to take effect.
• If the issue persists despite increasing the thread stack size, there may be underlying issues with the server or its configuration. Consult with MySQL experts or the MySQL community for further assistance.

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