05-24-2006
*** glibc detected *** double free or corruption (top): 0x08ec9a48 ***
I'm a C++ beginner programmer. I'm using C++ on Unix with the gcc version 3.4.5 20051201 (Red Hat 3.4.5-2).
I have the same error message with my simulation program. When this error happens then the simulation stops running with the message "Abort".
The simulation is supposed to run 50 replicates. This problem occurs randomly. Sometimes, it happened in the 32th and 37th replicates. Other time, it happened in the 3rd replicate.
So, I tried to debug the program by running the program step by step. Surprisingly, the program ran fine. No error.
Or when I tried to run the replicate that had this problem, then it ran fine, too. But not with 50 replicates in a row.
My friend told me maybe it had something to do with optimization. I even lowered the level of optimization from -O to -O0. It didn't help.
Could somebody educate me what is going on? Where should I look at?
Many thanks.
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FMIN(3) Linux Programmer's Manual FMIN(3)
NAME
fmin, fminf, fminl - determine minimum of two floating-point numbers
SYNOPSIS
#include <math.h>
double fmin(double x, double y);
float fminf(float x, float y);
long double fminl(long double x, long double y);
Link with -lm.
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
fmin(), fminf(), fminl(): _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or cc -std=c99
DESCRIPTION
These functions the lesser value of x and y.
RETURN VALUE
These functions return the minimum of x and y.
If one argument is a NaN, the other argument is returned.
If both arguments are NaN, a NaN is returned.
ERRORS
No errors occur.
VERSIONS
These functions first appeared in glibc in version 2.1.
CONFORMING TO
C99, POSIX.1-2001.
SEE ALSO
fmax(3)
COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
2008-08-11 FMIN(3)