Bug 113517

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Description of problem:
Using the following function in one of our program 
prctl(PR_SET_PDEATHSIG, SIGHUP, 0, 0); 
completely hangs the system.

RHEL 3.0. kernel 2.4.21-4.ELsmp.

The same program was running fine on RH8.0 kernel 2.4.20-20.8smp. 


The following test program reproduces the problem everytime, Note that
this is an SMP only issue, the same programs run fine on a uniprocessor.

//
// File       : pdeath.C
// Description: This test program, freeze the whole system
// by seting the prctl( PR_SET_PDEATHSIG, SIGHUP, 0, 0)
//
// compile using:
//  g++ -g -c pdeath.C  -o pdeath.o
//  g++ -g -o pdeath_Linux pdeath.o  -lpthread
//
// 

#include <sys/types.h>
#include <sys/prctl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>

int main(int argc, char *argv[])
{
   if(pid_t pid = fork()) {
      // parent
      printf("Parent forked child = %d\n", pid);
      // sleep for 5 seconds
      sleep(5);
      printf("Parent committing suicide\n");
   } else {
      // child
      printf("Child forked\n");
      // setup signal to be sent if parent process die.
      prctl(PR_SET_PDEATHSIG, SIGHUP, 0, 0);
      // sleep 100 seconds
      sleep(100);
   }
   return EXIT_SUCCESS;
}

Our test system is a IBM Z-pro with 2 pentium 3.0Ghz with 3G. of RAM.


Version-Release number of selected component (if applicable):
kernel 2.4.21-4.ELsmp

How reproducible:
Always

Steps to Reproduce:
1.just compile and run the above program it will hang everytime.

    

Actual Results:  Completely freeze the OS.

Expected Results:  exit gracefully, system does not hang.

Additional info: