Why am I getting MySQL Error 1436: Thread Stack Overrun?

Error 1436: Understanding MySQL's Thread Stack Overrun

When attempting to execute an update query, you encounter a puzzling error: "Thread stack overrun: 6136 bytes used of a 131072 byte stack, and 128000 bytes needed." Delving into the code, we discover that error 1436 (ER_STACK_OVERRUN_NEED_MORE) is triggered when insufficient stack memory is available for thread execution.

Default Thread Stack Size and Configuration

Ordinarily, MySQL sets the thread stack size to a default value of 192K (32-bit architectures) or 256K (64-bit platforms). However, this value can be overridden by modifying my.cnf settings or through custom builds.

Possible Causes

The issue can stem from various causes:

• Custom server builds with modified default stack size
• Explicit configuration in my.cnf with reduced stack size
• Potential issues within the pthread library

Verifying Default Values and Configuration

To determine the actual thread stack size, execute the following query:

SHOW VARIABLES LIKE 'thread_stack';

Check the my.cnf file for any explicit thread_stack settings.

Troubleshooting and Resolution

To resolve this error, focus on increasing the thread stack:

1. My.cnf Modification: Edit my.cnf and set 'thread_stack' to a value larger than the default (e.g., 512K or 1MB).
2. Server Restart: Restart MySQL for the new settings to take effect.
3. Verifying Stack Size: Confirm that the stack size has been modified as expected by running the 'SHOW VARIABLES LIKE 'thread_stack';' query.

Additional Considerations

If you encounter this error after a server restart, check for any errors in the server log file. These errors may indicate issues in setting the thread stack size.

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