Segmentation fault in PostData

Hello all,

 I seem to be receiving a segmentation fault whenever I run the PostData method. I have checked that all of my pointers are valid. I am not sure what the problem is. I will include the stack trace and code. All help is greatly appreciated.

Stack Trace

#5  AliAnalysisTask::PostData (this=<optimized out>, iout=<optimized out>, data=0x29e6d80, option=0x7f784ccc6300 "") at /nfshome/psteffan/alicesw/aliroot/v5-06-16/src/ANALYSIS/ANALYSIS/AliAnalysisTask.cxx:562
#6  0x00007f784ccbdf94 in AliAnalysisTaskPJ_B::UserExec (this=0x29711b0) at /nfshome/psteffan/cpalice/calib/./AliAnalysisTaskPJ_B.cxx:667
#7  0x00007f786443e57c in AliAnalysisTaskSE::Exec (this=0x29711b0, option=0x7f786531d53d "") at /nfshome/psteffan/alicesw/aliroot/v5-06-16/src/ANALYSIS/ANALYSISalice/AliAnalysisTaskSE.cxx:766
#8  0x00007f7861567c0a in TTask::ExecuteTask (this=0x29711b0, option=0x7f786531d53d "") at /nfshome/psteffan/alicesw/root/v5-34-26/src/core/base/src/TTask.cxx:272
#9  0x00007f78652db585 in AliAnalysisManager::ExecAnalysis (this=0x1d7fec0, option=option
entry=0x7f786531d53d "") at /nfshome/psteffan/alicesw/aliroot/v5-06-16/src/ANALYSIS/ANALYSIS/AliAnalysisManager.cxx:2358
#10 0x00007f78652e5abf in AliAnalysisSelector::Process (this=0x29d1ca0, entry=9) at /nfshome/psteffan/alicesw/aliroot/v5-06-16/src/ANALYSIS/ANALYSIS/AliAnalysisSelector.cxx:163
#11 0x00007f7862dc615f in TTreePlayer::Process (this=0x29e3b40, selector=0x29d1ca0, option=<optimized out>, nentries=<optimized out>, firstentry=0) at /nfshome/psteffan/alicesw/root/v5-34-26/src/tree/treeplayer/src/TTreePlayer.cxx:2179
#12 0x00007f78652df4db in AliAnalysisManager::StartAnalysis (this=0x1d7fec0, type=type
entry=0x29d1858 '377' <repeats 200 times>..., tree=tree
entry=0x2924420, nentries=100, firstentry=0) at /nfshome/psteffan/alicesw/aliroot/v5-06-16/src/ANALYSIS/ANALYSIS/AliAnalysisManager.cxx:1986

AliAnalysisTaskPJ_B (1).cxx (35.7 KB)

Hi Pat,

we’ll need more context. Can you isolate a bit the problem in a reproducer which does not depend on aliroot?

Danilo