RE: Problem running over chained ntuples. Get cannot seek to position error toward end of file

Hi Paul,

Either your file are corrupted (aka you would never be able to read the specific entry
of the specific file whether you read them separately or in a chain) or you are
victim of some type of memory corruption.

I recommend that you re-run your example using valgrind (valgrind.kde.org) which is likely
to pin point where the problem occur.

If valgrind is unable to give you a good/useable answer, please provide us with a complete
running example of the failure and we will look into.

Cheers,
Philippe

-----Original Message-----
From: owner-roottalk_at_pcroot.cern.ch [mailto:owner-roottalk_at_pcroot.cern.ch] On Behalf Of Paul Prichard
Sent: Monday, August 06, 2007 7:03 AM
To: roottalk_at_pcroot.cern.ch
Subject: [ROOT] Problem running over chained ntuples. Get cannot seek to position error toward end of file

Hi

I am using root version 5.12 and have used dq2_get to get two different datasets. These are

user.JelenaKrstic.T1_McAtNlo_Jimmy.recon.v12000604.SV_HPTV

and

user.MarijaMilosavljevic.trig1_misal1_mc12.005200.T1_McAtNlo_Jimmy.recon.AOD .SUSYView_HPTV.v12000604

I have used Make Selector to make skeleton code and after commenting out a few lines, and hash including some things, and writing something to chain the ntuples together and call process i can get the code to compile and run. There are 5000 events in each ntuple. The problem is that when it gets to just over 4000 events i get the following error,

Event: 4000
-922
Event: 4100
922
Event: 4200
922
Event: 4300
922
SysError in <TFile::Seek>: cannot seek to position 7957708041173560937 in file
/batchstore/prichard/ttbarJelena/user.JelenaKrstic.T1_McAtNlo_Jimmy.recon.v1
2000604.SV_HPTV.AANT1._00071.root,
retpos=-1 (Invalid argument)
Error in <TFile::ReadBuffer>: error reading all requested bytes from file
/batchstore/prichard/ttbarJelena/user.JelenaKrstic.T1_McAtNlo_Jimmy.recon.v1
2000604.SV_HPTV.AANT1._00071.root,
got 13583148 of 1013673577
Error in <TBranchElement::GetBasket>: File:
/batchstore/prichard/ttbarJelena/user.JelenaKrstic.T1_McAtNlo_Jimmy.recon.v1
2000604.SV_HPTV.AANT1._00071.root
at byte:0, branch:Jet_C4_TracksInCone_qOverPErr, entry:4323, badread=0 Event: 4400
-922
Event: 4500
-922
Aborted

This is with the first dataset, with the second i get

Event: 4200
-92.2923
Event: 4300
92.2923
SysError in <TFile::Seek>: cannot seek to position 8237190870936595570 in file
/hepstore/store2/prichard/prentuple/ttbar/user.MarijaMilosavljevic.trig1_mis
al1_mc12.005200.T1_McAtNlo_Jimmy.recon.AOD.SUSYView_HPTV.v12000604.AANT0._00 020.root,
retpos=-1 (Invalid argument)
Event: 4400
92.2923
Event: 4500
-92.2923
Event: 4600
92.2923
SysError in <TFile::Seek>: cannot seek to position 1033926962010700984 in file
/hepstore/store2/prichard/prentuple/ttbar/user.MarijaMilosavljevic.trig1_mis
al1_mc12.005200.T1_McAtNlo_Jimmy.recon.AOD.SUSYView_HPTV.v12000604.AANT0._00 020.root,
retpos=-1 (Invalid argument)
Error in <TFile::ReadBuffer>: error reading all requested bytes from file
/hepstore/store2/prichard/prentuple/ttbar/user.MarijaMilosavljevic.trig1_mis
al1_mc12.005200.T1_McAtNlo_Jimmy.recon.AOD.SUSYView_HPTV.v12000604.AANT0._00 020.root,
got 9472147 of 238955664
Error in <TBranchElement::GetBasket>: File:
/hepstore/store2/prichard/prentuple/ttbar/user.MarijaMilosavljevic.trig1_mis
al1_mc12.005200.T1_McAtNlo_Jimmy.recon.AOD.SUSYView_HPTV.v12000604.AANT0._00 020.root
at byte:0, branch:Jet_Kt4_TracksInCone_DeltaR, entry:4640, badread=0 Event: 4700
92.2923
Event: 4800
92.2923
SysError in <TFile::Seek>: cannot seek to position 1033926962010700984 in file
/hepstore/store2/prichard/prentuple/ttbar/user.MarijaMilosavljevic.trig1_mis
al1_mc12.005200.T1_McAtNlo_Jimmy.recon.AOD.SUSYView_HPTV.v12000604.AANT0._00 020.root,
retpos=-1 (Invalid argument)
Error in <TFile::ReadBuffer>: error reading all requested bytes from file
/hepstore/store2/prichard/prentuple/ttbar/user.MarijaMilosavljevic.trig1_mis
al1_mc12.005200.T1_McAtNlo_Jimmy.recon.AOD.SUSYView_HPTV.v12000604.AANT0._00 020.root,
got 9472147 of 238955664
Error in <TBranchElement::GetBasket>: File:
/hepstore/store2/prichard/prentuple/ttbar/user.MarijaMilosavljevic.trig1_mis
al1_mc12.005200.T1_McAtNlo_Jimmy.recon.AOD.SUSYView_HPTV.v12000604.AANT0._00 020.root
at byte:0, branch:Jet_Kt6_TracksInCone_DeltaR, entry:4877, badread=0 Event: 4900
92.2923
Event: 5000
92.2923
Event: 5100
92.2923

If the program does not abort then i seem to get the same error after another 5000 events. I have got the second dataset twice and the second time i was using a different harddisk for the dq2_get command in case this was a related problem.

Any help would be greatly appreciated.

Paul Received on Wed Aug 08 2007 - 19:32:14 CEST