@edgy - segmentation fault strlen - implicated apt-get, aptitude, synaptic, adept

[ryuujin]

Hi,
when I try to use apt-get (or similar) I found a Segmentation Fault:

apt-get dist-upgrade
Segmentation faulta dei pacchetti in corso... 0%

I tried to debug this with gdb, and:
-------
(gdb) run dist-upgrade
Starting program: /usr/bin/apt-get dist-upgrade
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
Lettura della lista dei pacchetti in corso... 0%
Program received signal SIGSEGV, Segmentation fault.
0xb7d19673 in strlen () from /lib/libc.so.6
(gdb) x/i $eip
0xb7d19673 <strlen+51>: mov (%eax),%ecx
(gdb) info stack
#0 0xb7d19673 in strlen () from /lib/libc.so.6
#1 0xb7e8e126 in std::string::compare () from /usr/lib/libstdc++.so.6
#2 0xb7f7d428 in debPackagesIndex::FindInCache () from /usr/lib/libapt-pkg-libc6.4-6.so.3.51
#3 0xb7f42b44 in pkgCacheGenerator::~pkgCacheGenerator () from /usr/lib/libapt-pkg-libc6.4-6.so.3.51
#4 0xb7f439b7 in pkgMakeStatusCache () from /usr/lib/libapt-pkg-libc6.4-6.so.3.51
#5 0xb7f3941c in pkgCacheFile::BuildCaches () from /usr/lib/libapt-pkg-libc6.4-6.so.3.51
#6 0xb7f39504 in pkgCacheFile::Open () from /usr/lib/libapt-pkg-libc6.4-6.so.3.51
#7 0x0805df6b in ?? ()
#8 0xb7f0613d in CommandLine::DispatchArg () from /usr/lib/libapt-pkg-libc6.4-6.so.3.51
#9 0x0804ee25 in ?? ()
#10 0xb7cc58cc in __libc_start_main (main=0x804eb86 <strcpy@plt+8186>, argc=2, ubp_av=0xbffe07c4,
    init=0x80635ed <std::vector<pkgSrcRecords::Parser::BuildDepRec, std::allocator<pkgSrcRecords::Parser::BuildDepRec> >::_M_insert_aux(__gnu_cxx::__normal_iterator<pkgSrcRecords::Parser::BuildDepRec*, std::vector<pkgSrcRecords::Parser::BuildDepRec, std::allocator<pkgSrcRecords::Parser::BuildDepRec> > >, pkgSrcRecords::Parser::BuildDepRec const&)+6573>,
    fini=0x80635e8 <std::vector<pkgSrcRecords::Parser::BuildDepRec, std::allocator<pkgSrcRecords::Parser::BuildDepRec> >::_M_insert_aux(__gnu_cxx::__normal_iterator<pkgSrcRecords::Parser::BuildDepRec*, std::vector<pkgSrcRecords::Parser::BuildDepRec, std::allocator<pkgSrcRecords::Parser::BuildDepRec> > >, pkgSrcRecords::Parser::BuildDepRec const&)+6568>,
    rtld_fini=0xb7fc5290 <_dl_rtld_di_serinfo+24112>, stack_end=0xbffe07bc) at libc-start.c:231
#11 0x0804cbc1 in ?? ()
(gdb)
------

It seems the problem is in strlen. So I tryed this simple source:
#include <strings.h>
#include <stdio.h>
int main(int argc, char **argv)
{
        if(argc>1)
                printf("%d",strlen(argv[2]));

        return 0;
}

and:
./a.out a
Segmentation fault (core dumped)

I've core files and other details if they'll be necessary.

Thanks...

..ryuujin

[Micah Cowan (micahcowan)]

Your test program is guaranteed to fail. You do strlen() on a nonexistant string (I think you wanted argv[1], which would give you the "a").

It is extremely unlikely that the problem is actually in strlen(): strlen() only uncovered the problem.

[ryuujin (mirchaemanuel)]

2006/8/21, Micah Cowan <email address hidden>:
>
> Your test program is guaranteed to fail. You do strlen() on a
> nonexistant string (I think you wanted argv[1], which would give you the
> "a").

You right... :) argv[1]

It is extremely unlikely that the problem is actually in strlen():
> strlen() only uncovered the problem.

I resolved with rm /var/cache/apt/*.bin
and I can understand why...

[honkitonk (kaynehrzuhause)]

I had the same problem. It works after removing the suggested bins.