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Bug in MarlinReco/PFOID/src/ [message #1765] Fri, 12 June 2009 10:20 Go to previous message
Messages: 34
Registered: February 2009
Hello Everyone,

I noticed that some of my reconstruction Jobs with Marlin crashed somewhat randomly. I finally was motivated enough to figure out why, and I think I found the problem. I hope this is the right place to post.

Running on 64 bit slc5:
gcc (GCC) 4.1.2 20080704 (Red Hat 4.1.2-44)


[ VERBOSE "MyPFOID"] WARNING!! This particle has no cluster
(no debugging symbols found)
Attaching to program: /proc/12992/exe, process 12992
(no debugging symbols found)...done.
[Thread debugging using libthread_db enabled]
[New Thread 0x2ae3d7ad2150 (LWP 12992)]
0x00000039cfc99335 in waitpid () from /lib64/
#1 0x00000039cfc3c2e1 in do_system () from /lib64/
#2 0x00002ae3d2df9476 in TUnixSystem::StackTrace ()
from /data/sailer/root/install5.22.00-patches/lib/
#3 0x00002ae3d2df72b3 in TUnixSystem::DispatchSignals ()
from /data/sailer/root/install5.22.00-patches/lib/
#4 <signal handler called>
#5 0x00002ae3d8bf5e53 in Histogram::GetNormContent ()
from /afs/ eco/HEAD/lib/
#6 0x00002ae3d8bf9d64 in PDF::GetLikelihood ()
from /afs/ eco/HEAD/lib/
#7 0x00002ae3d8c01f4b in PFOID::processEvent ()
from /afs/ eco/HEAD/lib/
#8 0x00002ae3d274f57a in marlin::ProcessorMgr::processEvent ()
from /afs/ v00-10-04/lib/
#9 0x00002ae3d1600f39 in SIO::SIOReader::readStream ()
from /afs/ 1-11/lib/
#10 0x00002ae3d15ff032 in SIO::SIOReader::readStream ()
from /afs/ 1-11/lib/
#11 0x0000000000406f6d in main ()
The program is running. Quit anyway (and detach it)? (y or n) [answered Y; input not from terminal]
Detaching from program: /proc/12992/exe, process 12992

in MarlinReco/v00-15/PFOID/src/

in Function Histogram::GetNormContent(VObject *VO)

there is:
  if (mind>totNoOfBins-1)
    mind = totNoOfBins-1;

But if totNoOfBins == 0, then this will cause mind to be become negative, the output said mind = -806020496
which crashed then in this line
 double result = content[mind]/norm;

When I added these lines
  if (mind < 0) {
    mind = 0;

The Segmentation violation did not happen anymore, but I have no idea what the function is doing, so there probably should be a better way to solve this issue?

I hope I explained well enough, what I think the problem is...


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