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From: Alexander Kogan <[EMAIL PROTECTED]>
To: Debian Bug Tracking System <[EMAIL PROTECTED]>
Subject: libc6: memory error in dlopen?
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Date: Sat, 04 Oct 2003 19:29:00 +0400
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Package: libc6
Version: 2.3.2-8
Severity: normal
Hi!
Valgrind says a memory error in dlopen.
Example:
$ cat main.c
#include <dlfcn.h>
int main( int argc, char* argv[] )
{
void *handle;
handle =3D dlopen( argv[1], RTLD_LAZY );
dlclose( handle );
}
Valgrind's output:
$ valgrind --num-callers=3D50 ./a.out /usr/lib/libz.so
=3D=3D18606=3D=3D Memcheck, a.k.a. Valgrind, a memory error detector for =
x86-linux.
=3D=3D18606=3D=3D Copyright (C) 2002-2003, and GNU GPL'd, by Julian Sewar=
d.
=3D=3D18606=3D=3D Using valgrind-20030725, a program supervision framewor=
k for x86-linux.
=3D=3D18606=3D=3D Copyright (C) 2000-2003, and GNU GPL'd, by Julian Sewar=
d.
=3D=3D18606=3D=3D Estimated CPU clock rate is 1004 MHz
=3D=3D18606=3D=3D For more details, rerun with: -v
=3D=3D18606=3D=3D
=3D=3D18606=3D=3D Conditional jump or move depends on uninitialised value=
(s)
=3D=3D18606=3D=3D at 0x40008ABA: _dl_relocate_object_internal (in /lib=
/ld-2.3.2.so)
=3D=3D18606=3D=3D by 0x4035BCF0: (within /lib/libc-2.3.2.so)
=3D=3D18606=3D=3D by 0x4000B115: _dl_catch_error_internal (in /lib/ld-=
2.3.2.so)
=3D=3D18606=3D=3D by 0x4035BF5B: _dl_open (in /lib/libc-2.3.2.so)
=3D=3D18606=3D=3D by 0x40252FE7: (within /lib/libdl-2.3.2.so)
=3D=3D18606=3D=3D by 0x4000B115: _dl_catch_error_internal (in /lib/ld-=
2.3.2.so)
=3D=3D18606=3D=3D by 0x40253455: (within /lib/libdl-2.3.2.so)
=3D=3D18606=3D=3D by 0x40253033: dlopen (in /lib/libdl-2.3.2.so)
=3D=3D18606=3D=3D by 0x804840B: main (in /home/jk/tmp/3/a.out)
=3D=3D18606=3D=3D by 0x4026ADBD: __libc_start_main (in /lib/libc-2.3.2=
.so)
=3D=3D18606=3D=3D by 0x8048340: (within /home/jk/tmp/3/a.out)
=3D=3D18606=3D=3D
=3D=3D18606=3D=3D Conditional jump or move depends on uninitialised value=
(s)
=3D=3D18606=3D=3D at 0x40008B05: _dl_relocate_object_internal (in /lib=
/ld-2.3.2.so)
=3D=3D18606=3D=3D by 0x4035BCF0: (within /lib/libc-2.3.2.so)
=3D=3D18606=3D=3D by 0x4000B115: _dl_catch_error_internal (in /lib/ld-=
2.3.2.so)
=3D=3D18606=3D=3D by 0x4035BF5B: _dl_open (in /lib/libc-2.3.2.so)
=3D=3D18606=3D=3D by 0x40252FE7: (within /lib/libdl-2.3.2.so)
=3D=3D18606=3D=3D by 0x4000B115: _dl_catch_error_internal (in /lib/ld-=
2.3.2.so)
=3D=3D18606=3D=3D by 0x40253455: (within /lib/libdl-2.3.2.so)
=3D=3D18606=3D=3D by 0x40253033: dlopen (in /lib/libdl-2.3.2.so)
=3D=3D18606=3D=3D by 0x804840B: main (in /home/jk/tmp/3/a.out)
=3D=3D18606=3D=3D by 0x4026ADBD: __libc_start_main (in /lib/libc-2.3.2=
.so)
=3D=3D18606=3D=3D by 0x8048340: (within /home/jk/tmp/3/a.out)
=3D=3D18606=3D=3D discard syms in /usr/lib/libz.so.1.1.4 due to munmap()
=3D=3D18606=3D=3D
=3D=3D18606=3D=3D ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 0 =
from 0)
=3D=3D18606=3D=3D malloc/free: in use at exit: 0 bytes in 0 blocks.
=3D=3D18606=3D=3D malloc/free: 5 allocs, 5 frees, 695 bytes allocated.
=3D=3D18606=3D=3D For a detailed leak analysis, rerun with: --leak-check=
=3Dyes
=3D=3D18606=3D=3D For counts of detected errors, rerun with: -v
--
Alexander Kogan
Institute of Applied Physics
Russian Academy of Sciences
-- System Information:
Debian Release: testing/unstable
Architecture: i386
Kernel: Linux forward 2.4.20-forward #1 SMP =F0=D4=CE =F1=CE=D7 24 16:19:=
36 MSK 2003 i686
Locale: LANG=3Dru_RU.KOI8-R, LC_CTYPE=3Dru_RU.KOI8-R
Versions of packages libc6 depends on:
ii libdb1-compat 2.1.3-7 The Berkeley database routin=
es [gl
-- no debconf information
---------------------------------------
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Date: Sat, 17 Jul 2004 11:58:46 +0900
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From: GOTO Masanori <[EMAIL PROTECTED]>
To: Alexander Kogan <[EMAIL PROTECTED]>,
[EMAIL PROTECTED]
Subject: Re: Bug#214096: libc6: memory error in dlopen?
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Hi,
At Sat, 04 Oct 2003 19:29:00 +0400,
Alexander Kogan wrote:
> Valgrind says a memory error in dlopen.
Thanks for your report. The program you said with 2.3.2.ds1-13 does
not cause memory error with valgrind. I think it's fixed in
2.3.2.ds1. I close this bug.
Regards,
-- gotom
