From mika@s1.cs.caltech.edu  Wed Oct  1 19:56:59 1997
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Date: Wed, 1 Oct 1997 19:56:57 -0700 (PDT)
From: Mika Nystroem <mika@cs.caltech.edu>
Reply-To: mika@cs.caltech.edu
To: FreeBSD-gnats-submit@freebsd.org
Subject:
X-Send-Pr-Version: 3.2

>Number:         4676
>Category:       kern
>Synopsis:       signals delivered slowly on 3.0-CURRENT/SMP
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          closed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Oct  1 20:00:02 PDT 1997
>Closed-Date:    Sun Apr 26 10:55:04 PDT 1998
>Last-Modified:  Sun Apr 26 10:55:39 PDT 1998
>Originator:     Mika Nystroem
>Release:        FreeBSD 3.0-CURRENT i386
>Organization:
Caltech Computer Science
>Environment:

FreeBSD-SMP running on dual or quad PPro, intel motherboard

>Description:

CPU-intensive processes that do no I/O are not sent signals in a timely
fashion.  The following program

main() { while(1); } 

can take from seconds to minutes to interrupt via a ctrl-C, ctrl-\, 
kill -TERM, or kill -KILL.

>How-To-Repeat:

run the program on a freebsd/smp system and hit ctrl-C.

>Fix:
	
Running this program in the background fixes all problems:
(I am not suggesting it be delivered with new freebsd systems!)

main()
{
   fork();
   fork();
   while(1) {
      int i=0;
      while(i++<1000000);
      usleep(500000);
   }
}   


>Release-Note:
>Audit-Trail:
Responsible-Changed-From-To: gnats-admin->freebsd-bugs 
Responsible-Changed-By: steve 
Responsible-Changed-When: Sun Oct 26 19:59:53 PST 1997 
Responsible-Changed-Why:  
Misfiled PR. 
State-Changed-From-To: open->closed 
State-Changed-By: phk 
State-Changed-When: Sun Apr 26 10:55:04 PDT 1998 
State-Changed-Why:  
this is due to the rather simple SMP code 
>Unformatted:
