[Perfparse-users] More information about Glibc error

[Paulo A. G. F. <pau...@de...>]

I've traced the problem with greater detail and found that the problem =
is at perf_get_next at log_parser.c file.

The problem occurs within these lines of code:

if(p1[0] =3D=3D '\'') {
                p1++;
                p2 =3D p1;
                /* Check length of label */
                while(p2[0] !=3D '\0') {
                        if((p2[0] =3D=3D '\\') && (p2[1] =3D=3D '\'')) {
                                p2++;
                        } else if((p2[0] =3D=3D '\\') && (p2[1] =3D=3D =
'\\')) {
                                p2++;
                        } else if(p2[0] =3D=3D '\'') {
                                break;
                        }
                        p2++;
                }
                if(p2[0] =3D=3D '\0') return(-2);
                if(p2[1] !=3D '=3D') return(-3);
                /* Reallocate memory for label if necessary */
                l =3D p2-p1;
                if(l>=3D p->label_len) {
                        p->label_len +=3D 20;
perfparse stops here =3D> p->label =3D =
realloc(p->label,p->label_len*sizeof(char));
                        if(NULL =3D=3D p->label) return(-4);
                }


And here go perfparse-log2mysql famous last words:

154                     l =3D p2-p1;
(gdb) n
155                     if(l>=3D p->label_len) {
(gdb)
157                             p->label =3D =
realloc(p->label,p->label_len*sizeof(char));
(gdb)
156                             p->label_len +=3D 20;
(gdb)
157                             p->label =3D =
realloc(p->label,p->label_len*sizeof(char));
(gdb)
*** glibc detected *** realloc(): invalid next size: 0x09853f98 ***

Program received signal SIGABRT, Aborted.
0x006327a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
(gdb) backtrace full
#0  0x006327a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
No symbol table info available.
#1  0x006727f5 in raise () from /lib/tls/libc.so.6
No symbol table info available.
#2  0x00674199 in abort () from /lib/tls/libc.so.6
No symbol table info available.
#3  0x006a64ea in __libc_message () from /lib/tls/libc.so.6
No symbol table info available.
#4  0x006ae8c2 in _int_realloc () from /lib/tls/libc.so.6
No symbol table info available.
#5  0x006af786 in realloc () from /lib/tls/libc.so.6
No symbol table info available.
#6  0x002ff067 in perf_get_next (data=3D0x98408b8, p=3D0x98409e8) at =
log_parser.c:157
        p1 =3D 0x772820 "\001"
        p2 =3D 0x9853f98 ""
        l =3D Variable "l" is not available.

I've found a link =
(http://www.archivesat.com/Linux_C_programming/thread1222039.htm) which =
tells about some kind of programming error which "blows away bookkeeping =
of the memory allocator". In this case, is this a Perfparse bug or a =
glibc bug?

[]'s and TIA

Paulo Afonso Graner Fessel
Administrador de Ambiente e Sistemas UNIX
pau...@de...
Fone: +55 (11) 3848-7422 (Novo n=FAmero)
http://www.dedalusprime.com.br