Hi Paul, Thanks for the useful information. My code has essentially two parts. The first part generates some data which is then used to call a minimiser function which is not written by me and it has been used fairly largely under Windows without any problem. After reading your email I seperated those parts by saving the data that caused the glibc memory corruption error and then running a small program which read the data and called the miniser, in this case, the program does not crash! but valgrind returns lots of errors such as: Use of uninitialised value of size 4 Conditional jump or move depends on uninitialised value(s) Syscall param write(buf) points to uninitialised byte(s) for a few lines of code inside that minimiser (a more detailed bit of valgrind's output is at the bottom of this email). I have no idea why this is not an issue under windows and how important those errors are and is that why I have heap corruption?
> Version of gcc is probably completely irrelevant. > What is the version of glibc? I upgraded from 2.3 to 2.5-2 > > > I did a bit of search and apparently this problem is common in g++4.* > > but g++-3.4 works fine. > > The references I find say "crashes under gcc-4 with stack checking enabled". > That's not a problem in gcc-4, it's a problem with user code having > stack overflows. > > > Any help on how to get g++-4.1.2 work properly is greatly appreciated. > > Look for a bug in your code? > Get glibc that is compiled without -fomit-fp ? I am not sure if that comes by default with apt-get install? Is there a way to check/change its value when installing glibc using apt-get in Debian? Cheers, Alikin, P.S. Piece of Valgrind output: ==4221== Use of uninitialised value of size 4 ==4221== at 0x42D4BC6: (within /lib/libc-2.5.so) ==4221== by 0x42DBB68: (within /lib/libc-2.5.so) ==4221== by 0x42DCAD3: __printf_fp (in /lib/libc-2.5.so) ==4221== by 0x42D82DB: vfprintf (in /lib/libc-2.5.so) ==4221== by 0x42E08C2: printf (in /lib/libc-2.5.so) ==4221== by 0x804FCE1: MRFEnergy<TypeGeneral>::Minimize_TRW_S(MRFEnergy<TypeGeneral>::Options&, double&, double&) (minimize.cpp:129) ==4221== by 0x80491A6: main (testtrw.cpp:88) ==4221== ==4221== Use of uninitialised value of size 4 ==4221== at 0x42D4BCC: (within /lib/libc-2.5.so) ==4221== by 0x42DBB68: (within /lib/libc-2.5.so) ==4221== by 0x42DCAD3: __printf_fp (in /lib/libc-2.5.so) ==4221== by 0x42D82DB: vfprintf (in /lib/libc-2.5.so) ==4221== by 0x42E08C2: printf (in /lib/libc-2.5.so) ==4221== by 0x804FCE1: MRFEnergy<TypeGeneral>::Minimize_TRW_S(MRFEnergy<TypeGeneral>::Options&, double&, double&) (minimize.cpp:129) ==4221== by 0x80491A6: main (testtrw.cpp:88) ==4221== ==4221== Use of uninitialised value of size 4 ==4221== at 0x42D4BD5: (within /lib/libc-2.5.so) ==4221== by 0x42DBB68: (within /lib/libc-2.5.so) ==4221== by 0x42DCAD3: __printf_fp (in /lib/libc-2.5.so) ==4221== by 0x42D82DB: vfprintf (in /lib/libc-2.5.so) ==4221== by 0x42E08C2: printf (in /lib/libc-2.5.so) ==4221== by 0x804FCE1: MRFEnergy<TypeGeneral>::Minimize_TRW_S(MRFEnergy<TypeGeneral>::Options&, double&, double&) (minimize.cpp:129) ==4221== by 0x80491A6: main (testtrw.cpp:88) ==4221== ==4221== Use of uninitialised value of size 4 ==4221== at 0x42D4BD8: (within /lib/libc-2.5.so) ==4221== by 0x42DBB68: (within /lib/libc-2.5.so) ==4221== by 0x42DCAD3: __printf_fp (in /lib/libc-2.5.so) ==4221== by 0x42D82DB: vfprintf (in /lib/libc-2.5.so) ==4221== by 0x42E08C2: printf (in /lib/libc-2.5.so) ==4221== by 0x804FCE1: MRFEnergy<TypeGeneral>::Minimize_TRW_S(MRFEnergy<TypeGeneral>::Options&, double&, double&) (minimize.cpp:129) ==4221== by 0x80491A6: main (testtrw.cpp:88) ==4221== ==4221== Conditional jump or move depends on uninitialised value(s) ==4221== at 0x42D4BE2: (within /lib/libc-2.5.so) ==4221== by 0x42DBB68: (within /lib/libc-2.5.so) ==4221== by 0x42DCAD3: __printf_fp (in /lib/libc-2.5.so) ==4221== by 0x42D82DB: vfprintf (in /lib/libc-2.5.so) ==4221== by 0x42E08C2: printf (in /lib/libc-2.5.so) ==4221== by 0x804FCE1: MRFEnergy<TypeGeneral>::Minimize_TRW_S(MRFEnergy<TypeGeneral>::Options&, double&, double&) (minimize.cpp:129) ==4221== by 0x80491A6: main (testtrw.cpp:88) _______________________________________________ help-gplusplus mailing list help-gplusplus@gnu.org http://lists.gnu.org/mailman/listinfo/help-gplusplus
