Technology for stall detection

A system for detecting stalling, comprising:

• a processor;
• and
• computer readable storage media having instructions stored thereon for execution by the processor, wherein the instructions executed by the processor cause the processor to perform operations comprising:
• receiving identification of a work process thread group for a task executing in a work process executing on a computer system, wherein the work process thread group includes a work process thread and the receiving includes receiving identification of the work process thread by a control process executing on the computer system;
• detecting whether there is a state change for the work process thread;
• marking the task as running responsive to detecting the state change for the work process thread;
• marking the task as stalled responsive to detecting an absence of the state change for the work process thread for at least a first predefined amount of time;
• marking the work process as stalled responsive to detecting an absence of a predetermined signal from the work process for at least a second predefined amount of time;
• getting stack traces for the work process thread via calls of an application programming interface;
• and
• calculating instances of a hash at respective times for each of the stack traces, and wherein the detecting of whether there is a state change for the work process thread comprises:
• comparing respective instances of the hash calculated at least the first predetermined amount of time apart.

A computer program product for detecting stalling, including a computer readable storage medium having instructions stored thereon for execution by a computer, wherein the instructions, when executed by the computer, cause the computer to perform operations comprising:

• receiving identification of a work process thread group for a task executing in a work process executing on a computer system, wherein the work process thread group includes a work process thread and the receiving includes receiving identification of the work process thread by a control process executing on the computer system;
• detecting whether there is a state change for the work process thread;
• marking the task as running responsive to detecting the state change for the work process thread;
• marking the task as stalled responsive to detecting an absence of the state change for the work process thread for at least a first predefined amount of time;
• marking the work process as stalled responsive to detecting an absence of a predetermined signal from the work process for at least a second predefined amount of time;
• getting stack traces for the work process thread via calls of an application programming interface;
• and
• calculating instances of a hash at respective times for each of the stack traces, and wherein the detecting of whether there is a state change for the work process thread comprises:
• comparing respective instances of the hash calculated at least the first predetermined amount of time apart.