Call to Thread run() instead of start()
Weakness ID: 572 (Weakness Variant)Status: Draft
+ Description

Description Summary

The program calls a thread's run() method instead of calling start(), which causes the code to run in the thread of the caller instead of the callee.

Extended Description

In most cases a direct call to a Thread object's run() method is a bug. The programmer intended to begin a new thread of control, but accidentally called run() instead of start(), so the run() method will execute in the caller's thread of control.

+ Time of Introduction
  • Implementation
+ Applicable Platforms



+ Demonstrative Examples

Example 1

The following excerpt from a Java program mistakenly calls run() instead of start().

(Bad Code)
Example Language: Java 
Thread thr = new Thread() {
public void run() {
+ Potential Mitigations

Use the start() method instead of the run() method.

+ Relationships
NatureTypeIDNameView(s) this relationship pertains toView(s)
ChildOfWeakness BaseWeakness Base366Race Condition within a Thread
Development Concepts (primary)699
Research Concepts (primary)1000
ChildOfCategoryCategory557Concurrency Issues
Development Concepts699
ChildOfCategoryCategory634Weaknesses that Affect System Processes
Resource-specific Weaknesses (primary)631
+ Affected Resources
  • System Process
+ Content History
Modification DateModifierOrganizationSource
2008-07-01Eric DalciCigitalExternal
updated Potential Mitigations, Time of Introduction
2008-09-08CWE Content TeamMITREInternal
updated Relationships, Other Notes
2009-05-27CWE Content TeamMITREInternal
updated Demonstrative Examples
2009-07-27CWE Content TeamMITREInternal
updated Description, Other Notes
Previous Entry Names
Change DatePrevious Entry Name
2008-04-11Call to