Segfault: function as parameter

From: Vassili Maroussov <Vassili.Maroussov_at_cern.ch>
Date: Mon, 17 May 2010 18:49:08 +0200

Dear ROOTers,

here is the code which causes the segmentation violation:

//file: callfunc.C
#include <iostream>

using namespace std;

void printit()
{

    cout << "Here we are." << endl;
}

void callfunc(void (*func)())
{

    (*func)();
}
//EOF Here is the ROOT session:

---

• *
• W E L C O M E to R O O T *
• *
• Version 5.26/00b 9 February 2010 *
• *
• You are welcome to visit our Web site *
• http://root.cern.ch *
• *

  ---

ROOT 5.26/00b (tags/v5-26-00b_at_32327, Feb 11 2010, 14:21:13 on linuxx8664gcc)

CINT/ROOT C/C++ Interpreter version 5.17.00, Dec 21, 2008 Type ? for help. Commands must be C++ statements. Enclose multiple statements between { }. root [0] .L callfunc.C++
Info in <TUnixSystem::ACLiC>: creating shared library /home/vmarouss/fluka_projects/ROOT_Code/./callfunc_C.so root [1] callfunc(printit)
Here we are.

• Break *** segmentation violation

  ---

There was a crash.
This is the entire stack trace of all threads:

---

#0 0x00000030980a48fe in waitpid () from /lib64/libc.so.6
#1 0x000000309803e2b9 in do_system () from /lib64/libc.so.6
#2 0x00007f22dead60af in TUnixSystem::StackTrace() () from
/usr/local/ROOT/5.26.00b/lib/libCore.so
#3 0x00007f22dead7014 in TUnixSystem::DispatchSignals(ESignals) () from
/usr/local/ROOT/5.26.00b/lib/libCore.so
#4 <signal handler called>
#5 0x00007f22ddfd0d2a in G__setnull () from
/usr/local/ROOT/5.26.00b/lib/libCint.so
#6 0x00007f22dd248d41 in G__callfunc_C_ACLiC_dict__0_1087(G__value*,
char const*, G__param*, int) ()

    from /home/vmarouss/fluka_projects/ROOT_Code/./callfunc_C.so
#7 0x00007f22dd248a6c in G__callfunc_C_ACLiC_dict__0_1088(G__value*,
char const*, G__param*, int) ()

    from /home/vmarouss/fluka_projects/ROOT_Code/./callfunc_C.so
#8 0x00007f22ddf34c6e in Cint::G__ExceptionWrapper(int (*)(G__value*,
char const*, G__param*, int), G__value*, char*, G__param*, int) () from /usr/local/ROOT/5.26.00b/lib/libCint.so
#9 0x00007f22ddfd41a1 in G__execute_call () from
/usr/local/ROOT/5.26.00b/lib/libCint.so
#10 0x00007f22ddfd5a12 in G__call_cppfunc () from
/usr/local/ROOT/5.26.00b/lib/libCint.so
#11 0x00007f22ddfb357d in G__interpret_func () from
/usr/local/ROOT/5.26.00b/lib/libCint.so
#12 0x00007f22ddfa1d0b in G__getfunction () from
/usr/local/ROOT/5.26.00b/lib/libCint.so
#13 0x00007f22ddf7e95a in G__getitem () from
/usr/local/ROOT/5.26.00b/lib/libCint.so
#14 0x00007f22ddf849f6 in G__getexpr () from
/usr/local/ROOT/5.26.00b/lib/libCint.so
#15 0x00007f22de001ada in G__exec_statement () from
/usr/local/ROOT/5.26.00b/lib/libCint.so
#16 0x00007f22ddf6b27e in G__exec_tempfile_core () from
/usr/local/ROOT/5.26.00b/lib/libCint.so
#17 0x00007f22ddf6b51e in G__exec_tempfile_fp () from
/usr/local/ROOT/5.26.00b/lib/libCint.so
#18 0x00007f22de00d159 in G__process_cmd () from
/usr/local/ROOT/5.26.00b/lib/libCint.so
#19 0x00007f22dd465196 in TCint::ProcessLine(char const*,
TInterpreter::EErrorCode*) ()

    from /usr/local/ROOT/5.26.00b/lib/libMetaTCint.so
#20 0x00007f22dea28221 in TApplication::ProcessLine(char const*, bool,
int*) ()

    from /usr/local/ROOT/5.26.00b/lib/libCore.so
#21 0x00007f22dd8d466a in TRint::HandleTermInput() () from
/usr/local/ROOT/5.26.00b/lib/libRint.so
#22 0x00007f22dead427e in TUnixSystem::CheckDescriptors() () from
/usr/local/ROOT/5.26.00b/lib/libCore.so
#23 0x00007f22dead4421 in TUnixSystem::DispatchOneEvent(bool) () from
/usr/local/ROOT/5.26.00b/lib/libCore.so
#24 0x00007f22dea75316 in TSystem::InnerLoop() () from
/usr/local/ROOT/5.26.00b/lib/libCore.so
#25 0x00007f22dea7748b in TSystem::Run() () from
/usr/local/ROOT/5.26.00b/lib/libCore.so
#26 0x00007f22dea2687f in TApplication::Run(bool) () from
/usr/local/ROOT/5.26.00b/lib/libCore.so
#27 0x00007f22dd8d4a05 in TRint::Run(bool) () from
/usr/local/ROOT/5.26.00b/lib/libRint.so
#28 0x000000000040106c in main ()

---

The crash is most likely caused by a problem in your script. Try to compile it (.L myscript.C+g) and fix any errors. If that does not help then please submit a bug report at http://root.cern.ch/bugs. Please post the ENTIRE stack trace from above as an attachment in addition to anything else that might help us fixing this issue.

Root > .q

What is illegal in the callfunc.C or in the ROOT session?

Regards,

Vassili Received on Mon May 17 2010 - 18:49:12 CEST