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Re: [Perfparse-users] More information about Glibc error
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From: Yves M. <yme...@fr...> - 2007-03-30 17:12:28
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Hi !
I have no perfparse development environment so I can only read from the mail.
What I see is that p2 is far too big. It increments until it finds a \0 character.
If p2 is so big, there is a problem before in the string that p2 iterates on.
Enjoy :)
Yves
On Fri, 30 Mar 2007 12:49:38 -0300, "Paulo Afonso Graner Fessel" <pau...@de...> wrote:
> 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] == '\'') {
> p1++;
> p2 = p1;
> /* Check length of label */
> while(p2[0] != '\0') {
> if((p2[0] == '\\') && (p2[1] == '\'')) {
> p2++;
> } else if((p2[0] == '\\') && (p2[1] == '\\')) {
> p2++;
> } else if(p2[0] == '\'') {
> break;
> }
> p2++;
> }
> if(p2[0] == '\0') return(-2);
> if(p2[1] != '=') return(-3);
> /* Reallocate memory for label if necessary */
> l = p2-p1;
> if(l>= p->label_len) {
> p->label_len += 20;
> perfparse stops here => p->label =
> realloc(p->label,p->label_len*sizeof(char));
> if(NULL == p->label) return(-4);
> }
>
>
> And here go perfparse-log2mysql famous last words:
>
> 154 l = p2-p1;
> (gdb) n
> 155 if(l>= p->label_len) {
> (gdb)
> 157 p->label =
> realloc(p->label,p->label_len*sizeof(char));
> (gdb)
> 156 p->label_len += 20;
> (gdb)
> 157 p->label =
> 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=0x98408b8, p=0x98409e8) at
> log_parser.c:157
> p1 = 0x772820 "\001"
> p2 = 0x9853f98 ""
> l = 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 número)
> http://www.dedalusprime.com.br
>
>
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