Why Am I Getting MySQL Error 1436: 'Thread Stack Overrun'?

Thread Stack Overrun: Error 1436 in MySQL

Error Description

MySQL error 1436, ER_STACK_OVERRUN_NEED_MORE, signifies a thread stack overrun. This error occurs when a thread attempts to use more stack memory than is available, typically during the execution of complex queries or triggers.

Root Cause

The primary cause of error 1436 is an insufficient thread stack size. The default thread stack size is typically set to 128KB (131072 bytes), but can be configured in the my.cnf configuration file.

Analysis of Error Details

The error message provides the following details:

• 1436: The error number.
• Thread stack: The area of memory used for storing local variables and function parameters during thread execution.
• Overrun: The stack has been exceeded.
• 6136 bytes used: The amount of stack memory used at the time of the error.
• 131072 byte stack: The total size of the thread stack.
• 128000 bytes needed: The amount of stack memory required by the current thread operation.

Determining the Thread Stack Source

To determine where the thread stack value is coming from:

1. Check the my.cnf configuration file for any explicit thread_stack settings.
2. Use the performance_schema.variables_info table to query the VARIABLE_SOURCE column for the 'thread_stack' variable. This will reveal whether the value is coming from the compiled binary, a configuration file, or a dynamic setting.

Solution

To resolve error 1436, increase the thread stack size to accommodate the memory requirements of the thread operation. This can be achieved by:

• Modifying the my.cnf file: Set the 'thread_stack' parameter to a higher value, typically 256KB or higher.
• Dynamically adjusting the thread stack size: Use the 'thread_stack' user-defined variable to set a specific stack size for individual connections.
• Optimizing the query or trigger: Reduce the stack usage of the query or trigger by optimizing it and reducing its complexity.
• Determining if a custom build of MySQL was used: If the error occurs in a custom build, verify that the default thread stack size was not modified during the compilation process.

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