Root files from 3.02.07 are not read by root 3.10.02

ROOT
1

Hello,

I am having a problem reading files from new root 3.10.02. It crashes when trying to read files created under root 3.02.07.

When trying to open a tree in TBrowser an error message is

Error in TBuffer::ReadObject: object tag too large, I/O buffer corrupted
…
Warniing in TExMap::Remove: key 1114792302 not found at 444
…

Both of them installed under Linux but with different compilers.

With respect,
Anton

2

It could be that you are hitting one of teh few special cases when reading
old versions that were fixed a few months ago in version 4.00.
Could you try reading your old file with version 4.00/04 ?

Rene

3

Hello

I installed root 4.00/04, but it still doesn’t read my files.
Here is an error output.

  •                                     *

  •    W E L C O M E  to  R O O T       *

  •                                     *
  • Version 4.00/04 24 May 2004 *
  •                                     *
  • You are welcome to visit our Web site *
  •      [root.cern.ch](http://root.cern.ch)            *

  •                                     *

FreeType Engine v2.1.3 used to render TrueType fonts.
Compiled for linux with thread support.

CINT/ROOT C/C++ Interpreter version 5.15.133, Apr 18 2004
Type ? for help. Commands must be C++ statements.
Enclose multiple statements between { }.
root [0] br= new TBrowser()
(class TBrowser*)0x8aaf870
root [1] Error in TBuffer::ReadObject: object tag too large, I/O buffer corrup
ted
Error in TBuffer::ReadObject: object tag too large, I/O buffer corrupted
Error in TBuffer::ReadObject: object tag too large, I/O buffer corrupted
Warning in TExMap::Remove: key 1114792302 not found at 444
Warning in TBuffer::CheckObject: reference to object of unavailable class TObj
ect, offset=1114792302 pointer will be 0
Warning in TExMap::Remove: key 4640000 not found at 328
Warning in TBuffer::CheckObject: reference to object of unavailable class TObj
ect, offset=4640000 pointer will be 0
…

I added my file in attachment if it helps.
File contains a tree.

With respect
Anton
20.05.2004.root (103 KB)

4

Root 4.00/06 does not read this file too.

Anton

5

Your file has not been created with the released version 3.02/07. It does not contain the StreamerInfo record. When I do:
root [0] TFile f(“20.05.2004.root”)
root [1] f.Map()
20040520/235922 At:64 N=134 TFile
20040520/235922 At:198 N=104839 TTree CX = 7.54
20040520/235922 At:105037 N=120 KeysList
20040520/235922 At:105157 N=78 FreeSegments
20040520/235922 At:105235 N=1 END

The StreamerInfo record is absolutly essential for schema evolution.

I took your file and processed it with 3.02/07. I copied the Tree into another file.
The file now contains the StreamerInfo record:

root [0] TFile f(“30207.root”)
root [1] f.Map()
20040615/123410 At:64 N=84 TFile
20040615/123416 At:148 N=104877 TTree CX = 7.54
20040615/123421 At:105025 N=3178 StreamerInfo CX = 3.48
20040615/123421 At:108203 N=95 KeysList
20040615/123421 At:108298 N=53 FreeSegments
20040615/123421 At:108351 N=1 END
root [2] tree
(class TTree*)0x8f754d0

As you can see there are no problems to read the tree.

Rene
30207.root (106 KB)