IDE/Discussion/General/finding memory leaks with librcheck or libmalloc/List of Posts
 
Forum Topic - finding memory leaks with librcheck or libmalloc: (6 Items)
   
Update
Lochet Maÿlis
12/11/2009 12:17 PM
post43676
finding memory leaks with librcheck or libmalloc   
Hi,

I'm trying to find some memory leak on a running program on my target.
I've seen the subject wiki3513, but when I set the following environment variable:
export LD_PRELOAD=librcheck.so.1
and run my program, I'v the error message :
# unknown symbol: pthread_setname_np
unknown symbol: __ldd_deregister_eh
unknown symbol: __ldd_register_eh
Could not resolve all symbols

How can I fix that?

Is it possible to do the same thing with the libmalloc?
With the libmalloc tool I get a dump file (using MALLOC_DUMP_LEAKS=/tmp/leak_mem), but I miss the allocation backtrace.

Maÿlis
Elena Laskavaia
12/11/2009 12:21 PM
post43678
Re: finding memory leaks with librcheck or libmalloc   
These errors indicate that you running it on QNX 6.3.0, this library can run only on 6.3.2.
For 6.3.0 use libmalloc_g.so.2 (or libmalloc.so.2 located in debug folder on target, I don't remember full path...)
Elena Laskavaia
12/11/2009 12:26 PM
post43679
Re: finding memory leaks with librcheck or libmalloc   
Check this doc: http://www.qnx.org/developers/docs/6.3.2/ide_en/user_guide/memory.html
Andy Jin(deleted)
12/11/2009 12:29 PM
post43681
Re: finding memory leaks with librcheck or libmalloc   
It's /usr/lib/libmalloc_g.so, it's actually a link to
the /usr/lib/malloc_g/libmalloc.so.2


-----Original Message-----
From: Elena Laskavaia <community-noreply@qnx.com>
Reply-to: post43678@community.qnx.com
To: general-ide <post43678@community.qnx.com>
Subject: Re: finding memory leaks with librcheck or libmalloc
Date: Fri, 11 Dec 2009 12:21:45 -0500 (EST)

These errors indicate that you running it on QNX 6.3.0, this library can run only on 6.3.2.
For 6.3.0 use libmalloc_g.so.2 (or libmalloc.so.2 located in debug folder on target, I don't remember full path...)
Lochet Maÿlis
12/14/2009 3:56 AM
post43759
Re: finding memory leaks with librcheck or libmalloc   
Like I've said, I tried with the debug libmalloc. I succed to have a memory leak dump file (using export 
MALLOC_DUMP_LEAKS=/logfile)

I found which pointer was not desallocated but I need to know where this allocation was made.

I've tried to connect to my target from the IDE (created a null project with the binary and launching a remote profile 
session via QCONN  in order to see the allocation backtrace), but I don't see anything in the IDE not even the 
allocation statistic. The console window is also empty.

The environment variables on my target are 
export LD_PRELOAD=/malloc_g/libmalloc.so.2
export MALLOC_CTHREAD=1
export MALLOC_TRACE=/dev/dbgmem

Did I miss something?
thanks
Elena Laskavaia
12/14/2009 1:22 PM
post43830
Re: finding memory leaks with librcheck or libmalloc   
Depends what you trying to do. If you want to import postmortem you need to 
import both files in IDE

export LD_PRELOAD=/malloc_g/libmalloc.so.2
export MALLOC_CTHREAD=1
export MALLOC_TRACE=/logfile1
export MALLOC_DUMP_LEAKS=/logfile2

transfer both logfile1 and logfile2 to target
Using Mememory Analysis import action import both files in the same session,
trace file first, than leaks.

Btw your leak log should contain allocation backtrace, can you attach it or part of it?

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