kern/79940: 5.3 with kernel debug causes panic when large # defunct processes occur

[Cory Marsh]

>Number:         79940
>Category:       kern
>Synopsis:       5.3 with kernel debug causes panic when large # defunct processes occur
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Apr 14 22:00:41 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator:     Cory Marsh
>Release:        5.3-RELEASE #3
>Organization:
Albertsons
>Environment:
i386 GENERIC with debug
>Description:
      FreeBSD 5.3 when compiled with the Kernel debugger will kernel panic when excessively high numbers of fork() without wait() occur.   This seems to be time specific so that inserting a sleep(1); in the while loop prevents thet panic.  Perhaps a race condition?
>How-To-Repeat:
options DDB
options KDB
makeoptions DEBUG=-g


#include <stdio.h>
#include <unistd.h>

int main(int argc, char **argv) {
	int pid;
	while(1) {
		if((pid = fork()) < 1)
			exit(2);	
	}
	exit(1);
}
>Fix:
      unknown.
>Release-Note:
>Audit-Trail:
>Unformatted: