Re: Segmentation violation with ROOT 5.28.00c

> The TList object in question contains TString
> objects created with new.

TString do not derived form TObject and as such should _not_ be added to a TList. Doing so result in undefined behavior (up to possibly looking like it is working :)).

 > I checked with valgrind and it gives "Invalid read of size 4" at this point.

Was valgrind explicit on why the read was invalid?

Cheers,
Philippe.

On 4/29/11 6:34 AM, Joern Wuestenfeld wrote:
> Hello Root experts,
>
> I have a problem with a code, that was working with root-v5.22g.
> After upgrading to 5.28.00c I get the following Segmentation violation
> in about 50% of the cases. The TList object in question contains TString
> objects created with new. The List contains exactly 1 element. I checked
> with valgrind and it gives "Invalid read of size 4" at this point.
>
> Any idea what could be wrong?
>
> ===========================================================
> There was a crash (kSigSegmentationViolation).
> This is the entire stack trace of all threads:
> ===========================================================
> #0 0xffffe424 in __kernel_vsyscall ()
> #1 0xb131b733 in waitpid () from /lib/libc.so.6
> #2 0xb12b9403 in ?? () from /lib/libc.so.6
> #3 0xb151d14b in system () from /lib/libpthread.so.0
> #4 0xb5dd3ef9 in TUnixSystem::Exec (this=0x80d4e20,
> shellcmd=0x84b3368
> "/opt/HSC/install/root-v5.28.00c/etc/gdb-backtrace.sh 3570 1>&2") at
> /opt/HSC/build/root-v5.28.00c/core/unix/src/TUnixSystem.cxx:2031
> #5 0xb5dd47b4 in TUnixSystem::StackTrace (this=0x80d4e20)
>
> at /opt/HSC/build/root-v5.28.00c/core/unix/src/TUnixSystem.cxx:2253
>
> #6 0xb5dd2279 in TUnixSystem::DispatchSignals (this=0x80d4e20,
>
> sig=kSigSegmentationViolation)
>
> at /opt/HSC/build/root-v5.28.00c/core/unix/src/TUnixSystem.cxx:1157
>
> #7 0xb5dd0471 in SigHandler (sig=kSigSegmentationViolation)
>
> at /opt/HSC/build/root-v5.28.00c/core/unix/src/TUnixSystem.cxx:357
>
> #8 0xb5dd7ae5 in sighandler (sig=11)
>
> at /opt/HSC/build/root-v5.28.00c/core/unix/src/TUnixSystem.cxx:3522
>
> #9<signal handler called>
>
> #10 0xb5da5bce in TClass::GetDirectoryAutoAdd (this=0x10004)
>
> at /opt/HSC/build/root-v5.28.00c/core/meta/src/TClass.cxx:5406
>
> #11 0xb5d726ab in TList::Delete (this=0x848fbd0, option=0xb61a4da8 "")
>
> at /opt/HSC/build/root-v5.28.00c/core/cont/src/TList.cxx:414
>
> #12 0xb5d72312 in TList::Clear (this=0x848fbd0, option=0xb61a4da8 "")
>
> at /opt/HSC/build/root-v5.28.00c/core/cont/src/TList.cxx:350
> #13 0xb5d717e7 in TList::~TList (this=0x848fbd0,
> __in_chrg=<value optimized out>)
> at /opt/HSC/build/root-v5.28.00c/core/cont/src/TList.cxx:83
> #14 0x080520ab in setupFiles (ev=0x805bc08) at setup.cc:391
> #15 0x08055903 in main (argc=3, argv=0xbfd9cbe4) at analyse.cc:92
> ===========================================================
>
>
> Regards, Jörn
>
Received on Fri Apr 29 2011 - 15:30:23 CEST