Bug 229517

+++ This bug was initially created as a clone of Bug #229481 +++

Description of Problem:
The gcore command hangs.
The process changes stop state when gcore is used like the sample application
program.
Here is the log.
[root@RHEL5RC gcore-hang]# ./gcoretest
(no debugging symbols found)
Using host libthread_db library "/lib/libthread_db.so.1".
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)

 2355  2671  2671  2671 ?           -1 Ss       0   0:00  \\_ sshd: root@pts/0
 2671  2674  2674  2674 pts/0     2674 Ss+      0   0:00  |   \\_ -bash
 2355  2818  2818  2818 ?           -1 Ss       0   0:00  \\_ sshd: root@pts/1
 2818  2820  2820  2820 pts/1     2911 Ss       0   0:00  |   \\_ -bash
 2820  2911  2911  2820 pts/1     2911 T+       0   0:00  |       \\_ ./gcoretest
 2911  2912  2912  2820 pts/1     2911 T        0   0:00  |           \\_
./gcoretest
 2912  2913  2912  2820 pts/1     2911 T        0   0:00  |               \\_
/bin/sh ./test.sh 2911
 2913  2914  2912  2820 pts/1     2911 T        0   0:00  |                  
\\_ /bin/sh /usr/bin/gcore 2911
 2914  2918  2912  2820 pts/1     2911 T        0   0:00  |                    
  \\_ gdb -x core.sD2916 -batch

How reproducible:
always

Step to Reproduce:
1.Uncompresse and compile the appended file. 
2.Execute it.

Actual Results:
The gcore command hangs.

Expected Result:
The gcore command doesn't hang and run properly.

Hardware configuration:
I confirmed the problem on IA-64, x86_64.
I think the problem occur on IA-32.

---

I tested this issue and it seems that we could reproduce this issue. 

26490 26493 26493 26493 pts/0    26785 Ss       0   0:00  \\_ bash
26493 26785 26785 26493 pts/0    26785 T+       0   0:00  |   \\_
./gcoretest
26785 26786 26786 26493 pts/0    26785 T        0   0:00  |       \\_
./gcoretest
26786 26787 26786 26493 pts/0    26785 T        0   0:00  |           \\_
/bin/sh ./test.sh 26785
26787 26788 26786 26493 pts/0    26785 T        0   0:00  |              
\\_ /bin/sh /usr/bin/gcore 26785
26788 26792 26786 26493 pts/0    26785 T        0   0:00  |                
  \\_ gdb -x core.P26790 -batch
...
       1 26794 26786 26493 pts/0    26785 Z        0   0:00 [gdb]
<defunct>

At this point, there was "core.P26790" (ascii text) in current
directory.

================
# cat core.P26790
attach 26785
gcore core.26785
detach
quit
================