Re: segfault trying to plot ntuples

Hi Rene,

On Friday 04 June 2010 12:47 AM, Rene Brun wrote:
> I cannot reproduce your problem using your script with no changes and
> your files.
> I tried on Linux (32 and 64 bits) and mac
>

After your message I tried with ROOT 5.27/03 and 5.27/02, and the problem isn't there any more. But on using 5.26 it reappears.

I am on Fedora 13 x86_64. I can switch to using 5.27 for now. But let me know if I can try something else to confirm whether its some one off problem on my side.

> Rene Brun
>
>
>>
>> And a sample of the macro is attached. The root files I used are here:
>> <http://hep.phys.sfu.ca/~suvayu/4roottalk/>
>>
>> Backtrace: (ROOT 5.26)
>> ======================
>>> #8 memcpy () at ../sysdeps/x86_64/memcpy.S:526
>>> #9 0x00007f5cb7dcc492 in TBasket::ReadBasketBuffers (this=0x1bcb0d0,
>>> pos=576290, len=219, file=0x20f0ee0) at tree/tree/src/TBasket.cxx:367
>>> #10 0x00007f5cb7dd9896 in TBranch::GetBasket (this=0x1bcc500,
>>> basketnumber=0) at tree/tree/src/TBranch.cxx:1068
>>> #11 0x00007f5cb7dd9e05 in TBranch::GetEntry (this=0x1bcc500, entry=0,
>>> getall=0) at tree/tree/src/TBranch.cxx:1170
>>> #12 0x00007f5cb7667c78 in R__LoadBranch (br=0x1bcc500, entry=0,
>>> quickLoad=true) at tree/treeplayer/src/TTreeFormula.cxx:98
>>> #13 0x00007f5cb7679b39 in TTreeFormula::EvalInstance (this=0x1bcee20,
>>> instance=0, stringStackArg=0x0) at
>>> tree/treeplayer/src/TTreeFormula.cxx:3833
>>> #14 0x00007f5cb765ede2 in TSelectorDraw::ProcessFill (this=0x1c2fdd0,
>>> entry=0) at tree/treeplayer/src/TSelectorDraw.cxx:1091
>>> #15 0x00007f5cb769755a in TTreePlayer::Process (this=0x1c30700,
>>> selector=0x1c2fdd0, option=0x7f5cb7f1d400 "", nentries=553,
>>> firstentry=0)
>>> at tree/treeplayer/src/TTreePlayer.cxx:2796
>>> #16 0x00007f5cb768dfb1 in TTreePlayer::DrawSelect (this=0x1c30700,
>>> varexp0=0x7f5cb73aed73 "MET>>tmp_histo(100,0,100)",
>>> selection=0x7f5cb7f1d400 "",
>>> option=0x7f5cb7f1d400 "", nentries=1000000000, firstentry=0) at
>>> tree/treeplayer/src/TTreePlayer.cxx:1073
>>> #17 0x00007f5cb7e3a906 in TTree::Draw (this=0x1bcb720,
>>> varexp=0x7f5cb73aed73 "MET>>tmp_histo(100,0,100)",
>>> selection=0x7f5cb7f1d400 "", option=0x7f5cb7f1d400 "",
>>> nentries=1000000000, firstentry=0) at tree/tree/src/TTree.cxx:3442
>>> #18 0x00007f5cb7e1e7fc in TTree::Draw (this=0x1bcb720,
>>> opt=0x7f5cb73aed73 "MET>>tmp_histo(100,0,100)") at include/TTree.h:259
>>> #19 0x00007f5cb73adce5 in plot (key=0x1b35840, canvas=0x1c374b0) at
>>> /home/jallad/codebaby/macros/sample.C:136
>>> #20 0x00007f5cb73adbfd in read_dir (dir=0x1b63ad0, canvas=0x1c374b0)
>>> at /home/jallad/codebaby/macros/sample.C:121
>>> #21 0x00007f5cb73ad59f in overlay () at
>>> /home/jallad/codebaby/macros/sample.C:51
>>
>

-- 
Suvayu

Open source is the future. It sets us free.