Hi,
In my short program accessing MySQL database I am experiencing spurious SEGVs. There is a loop over all rows in the returned TSQLResult. At the 4th iteration, the program crashes.
Here is the piece of code (fragment from inside the loop):
//------------------------- try fitting here -------------------------
TH1D *fitHistos[3];
char histname[255];
sprintf(histname, "fithist_p_%s", ticker); cout << histname << endl; fitHistos[0]=new TH1D(histname, histname, n_values, 0, n_values);
sprintf(histname, "fithist_index_%s", ticker); cout << histname << endl; fitHistos[1]=new TH1D(histname, histname, n_values, 0, n_values);
sprintf(histname, "fithist_%s", ticker); cout << histname << endl; fitHistos[2]=new TH1D(histname, histname, n_values, 0, n_values);
for(int i=1; i<=n_values; i++) {
fitHistos[0]->SetBinContent(i, p[i]);
fitHistos[1]->SetBinContent(i, indices[i]);
fitHistos[2]->SetBinContent(i, p[i]/indices[i]);
}
c1->cd(1); fitHistos[2]->Draw("hist");
c1->cd(2); fitHistos[0]->Draw("hist");
c1->cd(3); fitHistos[1]->Draw("hist");
//--------------------------------------------------------------------
The crash happens in the 3rd TH1D constructor above, with the following debugger output:
----------------------------------------
Program received signal SIGSEGV, Segmentation fault.
0x413cb6f2 in chunk_alloc (ar_ptr=0x41460ce0, nb=24) at malloc.c:2764
2764 malloc.c: No such file or directory.
Current language: auto; currently c
(gdb) where
#0 0x413cb6f2 in chunk_alloc (ar_ptr=0x41460ce0, nb=24) at malloc.c:2764
#1 0x413cb5ae in __libc_malloc (bytes=16) at malloc.c:2696
#2 0x413611e6 in __builtin_new (sz=16) from /usr/lib/libstdc++-libc6.1-1.so.2
#3 0x401713ac in TList::NewLink () from /mnt/disk1/physics/root_3.05//lib/root/libCore.so
#4 0x40170aa7 in TList::AddLast () from /mnt/disk1/physics/root_3.05//lib/root/libCore.so
#5 0x4016f15b in THashList::AddLast () from /mnt/disk1/physics/root_3.05//lib/root/libCore.so
#6 0x4017213e in TList::Add () from /mnt/disk1/physics/root_3.05//lib/root/libCore.so
#7 0x40114ac0 in TDirectory::Append () from /mnt/disk1/physics/root_3.05//lib/root/libCore.so
#8 0x4078293d in TH1::Build () from /mnt/disk1/physics/root_3.05//lib/root/libHist.so
#9 0x40781d61 in TH1::TH1 () from /mnt/disk1/physics/root_3.05//lib/root/libHist.so
#10 0x40793f77 in TH1D::TH1D () from /mnt/disk1/physics/root_3.05//lib/root/libHist.so
#11 0x804c590 in HFHelp::getRank (_server=0x88b23b8, ticker=0xbfffee58 "TTIL", time_end=970810200, mode=2,
params=0xbfffee24, c1=0x88b5c88, debug=1) at HFHelp.hh:138
#12 0x804aa1d in main (argc=7, argv=0xbffff634) at HFTrader.cc:204
-----------------------------------------
Please note that the program went through several identical iterations already before crashing...
Any help would be appreciated.
I am using root 3.05/05 under RedHat Linux 7.2.
Thanks,
Valery.
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