Description of problem:
pidof sometimes reports either of the following error messages unexpectedly:

 - "can't get program name from /proc/<pid>/stat"
 - "can't read sid from /proc/<pid>/stat"

Version-Release number of selected component (if applicable):
SysVinit-2.86-15.el5

How reproducible:
Sometimes

Steps to Reproduce:
1. Create a script which freqently spawns and reaps processes, e.g.:
#!/bin/bash
 
 function dummyproc()
 {
     while true
     do
         /bin/true &
     done
 }
 
 for i in `seq 1 1 10`
 do
     dummyproc &
 done
 
 wait

2. Start it in the background:
./test.sh &

3. run pidof of some daemon in the loop, and observe.
while true; do pidof syslogd > /dev/null; done
  
Actual results:
From time to time an error message like this is printed out:
pidof: can't get program name from /proc/6072/stat

Expected results:
No error messages.

Additional info:
There seems to be bug in the killall5 code causing this: killall5 uses fopen to open /proc/<pid>/stat and then freads from it.  It may happen that the file disppears between fopen and fread and this situation is not being addressed anyhow.