valgrind-users — General discussion list for Valgrind users

[Valgrind-users] Uninitialised values

[Stephane D. <ste...@ex...>]

Hello,

valgrind reports lots of use of uninitialised values in my program, all
of them being located in a Base64 encoder working on random data
(actually PKCS padding bytes). 
This function does a lot of left shifts, right shifts and other
bit-level stuff. Is it possible that my data accidentally contains the
bit pattern used by valgrind to trace uninitialised data ?

Stephane

[Valgrind-users] "the `impossible' happened" - error

[Geert F. <gee...@es...>]

hello, valgrind died with the following message:

-----------------------------------------
disInstr: unhandled opcode 0xE0 then 0x19

valgrind: the `impossible' happened:
    unhandled x86 opcode
Basic block ctr is approximately 50850000

sched status:

Thread 1: status = Runnable, associated_mx = 0x0, associated_cv = 0x0
==11282==    at 0x406F1B48: ???
==11282==    by 0x80F3690: GRV::bDraw(bool) (GRV.cpp:97)
==11282==    by 0x80F6E98: GRVCNeuron::bDraw(bool) (GRVCNeuron.cpp:90)
==11282==    by 0x807E69C: GBrain::bRun() (GBrain.cpp:129)

Please report this bug to: js...@ac...
------------------------------------------

any idea what is going wrong? is this an error in valgrind (i doubt it 
as my program crashes without valgrind as well), or an error in GCC (i'm 
using 3.2.2), or (most likely) my mistake? the code where he crashes on 
makes some heavy use of virtual functions and overloaded function. what 
should i put i my bugreport?

greets,
geert.

[Valgrind-users] Partial code instrumenting

[Stephane D. <ste...@ex...>]

Hello all,

is it possible to tell valgrind to ignore some DLLs when running a
program ? 
I'm trying to debug a program linked with the JVM, and valgrind fails
with an out of memory error. It seems that instrumenting the libjvm.so
file requires a lot of memory resources (about 400 MB !)


Regards,
Stephane Donze

Re: [Valgrind-users] valgrind and dns queries

[Jeremy F. <je...@go...>]

On Mon, 2003-06-23 at 20:47, Vijay Kamath wrote:
> I was able to reproduce the problem. It occurs if I'm using threads. 
> I've attached a sample code that causes this problem. The code fails 
> when run with valgrind, but passes without it.
> Please let me know where is the problem - resolv, pthread, valgrind, my 
> code ??
> 
> Any help would be great.

Hm, I can reproduce this here on both my RH8 and RH9 machines.  I'm
guessing it has something to do with thread-specific data, but it isn't
related to the new TLS stuff.  I can't see anything obvious with
--trace-pthread=all.

	J

Re: [Valgrind-users] valgrind and dns queries

[Vijay K. <vij...@wi...>]

I was able to reproduce the problem. It occurs if I'm using threads. 
I've attached a sample code that causes this problem. The code fails 
when run with valgrind, but passes without it.
Please let me know where is the problem - resolv, pthread, valgrind, my 
code ??

Any help would be great.

Thanks.

Vijay

Dirk Mueller wrote:

>On Mon, 23 Jun 2003, Vijay Kamath wrote:
>
>  
>
>>idea what it could be. And why doesn't valgrind show any error?!
>>    
>>
>
>are you suere the very same parameters being passed to the function?
>Maybe valgrind triggers another bug else where and the parameters you pass 
>to the function while running under valgrind are not the same. 
>
>do you use threads?
>
>can you try with CVS HEAD version ?
>
>can you try with --optimise=no --chain-bb=no ?
>
>
>
>  
>

[Valgrind-users] Missing functions in stack trace

[Rao G. <ra...@t7...>]

Hi

Sometimes when valgrind reports "invalid write" error, it gives me a stack 
trace but there are functions missing from that stack trace. If I use 
--gdb-attach=yes, gdb is also confused about the stack and when I do "up", 
it goes from the lower level function to a function 2 levels higher 
instead of the next higher level function. I tried increasing num-callers 
to 50 in the command line invocation of valgrind. Any ideas on how to fix 
this? or is it a bug in valgrind.

Thanks for your help
Rao

-- 
--------------------------------------------------------------------
Rao V Garimella  			Tel: (505) 665-2928
T-7, MS B284 	 	   '\   '\ 	FAX: (505) 665-5757
Los Alamos National Lab	     ( )-( )   	Email: ra...@la...
Los Alamos, NM 87545	                http://www.ees.lanl.gov/staff/rao		
--------------------------------------------------------------------

	

Re: [Valgrind-users] valgrind and dns queries

[Dirk M. <dm...@gm...>]

On Mon, 23 Jun 2003, Vijay Kamath wrote:

> idea what it could be. And why doesn't valgrind show any error?!

are you suere the very same parameters being passed to the function?
Maybe valgrind triggers another bug else where and the parameters you pass 
to the function while running under valgrind are not the same. 

do you use threads?

can you try with CVS HEAD version ?

can you try with --optimise=no --chain-bb=no ?



-- 
Dirk

Re: [Valgrind-users] valgrind and dns queries

[Vijay K. <vij...@wi...>]

Dirk Mueller wrote:

>On Mon, 23 Jun 2003, Vijay Kamath wrote:
>
>  
>
>>I've a program which makes dns client query using res_search(...).
>>The program runs fine without valgrind, but when I run it through 
>>valgrind res_search() returns error! valgrind doesn't show any error! 
>>Any idea why this could happen?
>>    
>>
>
>can you do a small testcase showing the problem?
>  
>
I tried reproducing the problem by writing a small program that tests 
this call, it passed and valgrind did not show any problem. It happens 
only in my production code. And unfortunately it is too big to be shown 
here.
So if there is a problem, it should be with my code, but I have no idea 
what it could be. And why doesn't valgrind show any error?!
Any help will be greatly appreciated.

>
>  
>

Re: [Valgrind-users] cry for assistanse

[Patrick M. <un...@pa...>]

On 23-Jun-2003, Gao, Jiafu wrote:
> No, this is not a joke. This is a scam. See the following email.

Thats not quite what I ment. That it was sent to this mailing list (one thats
known to be populated by smart people whove gotten the nigera scam email about
5000 times by now) and that its yet another version of the nigera scam email.

-- 
Patrick "Diablo-D3" McFarland || un...@pa...
"Computer games don't affect kids; I mean if Pac-Man affected us as kids, we'd 
all be running around in darkened rooms, munching magic pills and listening to
repetitive electronic music." -- Kristian Wilson, Nintendo, Inc, 1989

RE: [Valgrind-users] cry for assistanse

[Gao, J. <JG...@se...>]

No, this is not a joke. This is a scam. See the following email.

Jeff
========================================================
Subject: Security Alert!!!!
Importance: High

Internet Fraud Tips from the National Consumers League's Internet Fraud
Watch

Nigerian Money Offers: Someone has contacted you from Nigeria or another
African country and offered you millions of dollars.All you have to do is
help transfer money, diamonds, or other ricches to your bank account for
safekeeping. It sounds like a dream come true, but it's really a night mare.

Be aware that these scams are well-known. They used to be called "Nigerian
letters" because they came by mail, but now these messages also come by
phone, fax, or email. 

These promises are never true. The purpose of the scam is to get money out
of your bank account, not to put money into it. 

Once you are on the hook, they'll never let you go. You will be asked for a
never-ending series of payments for "transfer fees," "legal expenses," and
other bogus costs. 

Be wary of offers to send you an "advance" on your "commission." Some con
artists use this ploy to build trust and to get money from your bank. They
send you a check for part of your "commission," instructing you to deposit
it and then wire payment to them for taxes, bonding, or some other phony
purpose. The bank tells you the check has cleared because the normal time
has passed to be notified that checks have bounced. After you wire the
money, the check that you deposited finally bounces because it turned out to
be an elaborate fake. Now the crooks have your payment, and you're left
owing your bank the amount that you withdrew. 

Don't believe photographs of the "treasure." One common ploy is to tape
money around a block of wood or bundles of paper to make it look like a
large amount of currency. Sometimes the crooks even sprinkle harmless powder
on the money and tell victims that it's a toxic chemical used to protect it.
Then they offer to sell a special substance to remove the powder! 

Never provide your bank account or other financial information. This
information can be used to withdraw money from your account. 

Don't agree to travel anywhere to meet these people. They avoid coming to
the United States because they fear arrest. Instead, they sometimes try to
lure victims to meet them in Africa or other countries. Victims have been
robbed and even murdered. 

Remember that these are hardened criminals. According to the Secret Service,
these crooks use the money they make on this scam to finance other illegal
activities such as drug dealing and credit card fraud. 

If they get your money, you'll never get it back. It's very difficult to
bring these crooks to the United States for trial, and action is rarely
taken against them in their own countries. However, it's still helpful to
report actual or attempted Nigerian money offer scams to law enforcement
agencies. 
========================================================

-----Original Message-----
From: Patrick McFarland [mailto:un...@pa...] 
Sent: Monday, June 23, 2003 3:12 AM
To: val...@li...
Subject: Re: [Valgrind-users] cry for assistanse


On 22-Jun-2003, . wrote:
> stuff

This is a joke, right?

-- 
Patrick "Diablo-D3" McFarland || un...@pa...
"Computer games don't affect kids; I mean if Pac-Man affected us as kids,
we'd 
all be running around in darkened rooms, munching magic pills and listening
to repetitive electronic music." -- Kristian Wilson, Nintendo, Inc, 1989


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Re: [Valgrind-users] valgrind and dns queries

[Dirk M. <dm...@gm...>]

On Mon, 23 Jun 2003, Vijay Kamath wrote:

> I've a program which makes dns client query using res_search(...).
> The program runs fine without valgrind, but when I run it through 
> valgrind res_search() returns error! valgrind doesn't show any error! 
> Any idea why this could happen?

can you do a small testcase showing the problem?


-- 
Dirk

[Valgrind-users] valgrind and dns queries

[Vijay K. <vij...@wi...>]

I've a program which makes dns client query using res_search(...).
The program runs fine without valgrind, but when I run it through 
valgrind res_search() returns error! valgrind doesn't show any error! 
Any idea why this could happen?

Thanks.

Vijay

Re: [Valgrind-users] cry for assistanse

[Patrick M. <un...@pa...>]

On 22-Jun-2003, . wrote:
> stuff

This is a joke, right?

-- 
Patrick "Diablo-D3" McFarland || un...@pa...
"Computer games don't affect kids; I mean if Pac-Man affected us as kids, we'd 
all be running around in darkened rooms, munching magic pills and listening to
repetitive electronic music." -- Kristian Wilson, Nintendo, Inc, 1989

Re: [Valgrind-users] using --gdb-attach=yes

[Timothee B. <tt...@id...>]

I don't know much about valgrind code, but I added a verbose message to
vg_is_GDB_attach_requested and saw that the ioerror jump is being used.
Don't know how to retrieve the errno from there though.

TTimo

On Sun, 22 Jun 2003 16:14:09 +0200
Timothee Besset <tt...@id...> wrote:

> I am trying to use the --gdb-attach=yes option to use gdb and lookup
> errors reported by valgrind. I am seeing the prompt:
> 
> ==4853== ---- Attach to GDB ? --- [Return/N/n/Y/y/C/c] ---- ==4853==
> 
> But valgrind continues to run without actually stopping at the prompt.
> What is causing this?
> 
> I don't think I'm doing anything really strange to stdin. It's a console
> application with a little shell though, so I'm constantly scanning stdin
> for my own input. I suppose that can be a problem?
> 
> TTimo
> 
> 
> -------------------------------------------------------
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> Refer Dedicated Servers. We Manage Them. You Get 10% Monthly Commission!
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> 


-- 

[Valgrind-users] cry for assistanse

[. <la...@ne...>]

FROM: AMSTERDAM-NETHERLANDS

Dear friend,

You may be surprised to receive this letter from me since 
you do not know me personally. I am the first son of the 
most popular black farmer in Zimbabwe who was 
murdered in the land dispute in my country. I got your 
contact through network online hence decided to write 
you. Before the death of my father, he had taken me to 
Johannesburg to deposit the sum of USD5.Million (Five 
million United States dollars), in one of the private 
security company, as he foresaw the looming danger in 
Zimbabwe. This money was deposited in a box as gem 
stones to avoid much demurrage from Security Company.

This amount was meant for the purchase of new machines 
and chemicals for the Farms and establishment of new 
farms in Swaziland. This land problem came when 
Zimbabwean President Mr. Robert Mugabe when he 
introduced a new Land Act Reform wholly affecting the 
rich white farmers and some few black farmers, and this 
resulted to the killing and mob action by Zimbabwean 
war veterans and some lunatics in the society. In fact a lot 
of people were killed because of this Land reform Act for 
which my father was one of the victims. it is against this 
background that I and my family fled Zimbabwe to South 
Africa for fear of our lives.

After which I traveled to the Netherlands and I am 
currently staying in the Netherlands where i am seeking 
political asylum and more so have decided to transfer my 
father's money to a more reliable foreign account. Since 
the law of Europe prohibits a refugee (asylum seeker) to 
open any bank account or to be involved in any financial 
transaction throughout the territorial zone of European 
Union. As the eldest child of my father, I am saddled with 
the responsibility of seeking a genuine foreign account 
where this money could be transferred without the 
knowledge of my government who are bent on taking 
everything we have got. 

The South African government seems to be playing along 
with them. I am faced with the dilemma of moving this 
amount of money out of South Africa for fear of going 
through the same experience in future. Both countries 
have similar political history. I am seeking for a partner 
who I have to entrust my future and that of my family in 
his hands, I must let you know that this transaction is risk 
free. If you accept to assist me and my family, all I want 
you to do for me, is to make arrangements with the 
security company to clear the Consignment (funds) from 
their affiliate office here in the Netherlands as i have 
already given directives for the consignment to be brought 
to the Netherlands from South Africa.

But before then all modalities will have to be put in place 
like change of ownership to the consignment. I have two 
options for you. Firstly you can choose to have certain 
percentage of the money for nominating your account for 
this transaction. Or you can go into partnership with me 
for the proper profitable investment of the money in your 
country. Whichever the option you want, feel free to 
notify me. I have also mapped out 2% of this money for 
all kinds of expenses incurred in the process of this 
transaction. If you do not prefer a partnership I am willing 
to give you 10% of the money while the remaining 88% 
will be for my investment in your country. Contact with 
me immediately while I implore you to maintain the 
absolute secrecy required in this transaction. 

Thanks, GOD BLESS YOU 

Best regards,


NOTE: 
ON YOUR INABILITY TO HANDLE THIS 
TRANSACTION RESPOND TO ME AND INFORM 
ME SO I CAN LOOK FOR SOMEONE ELSE.

[Valgrind-users] using --gdb-attach=yes

[Timothee B. <tt...@id...>]

I am trying to use the --gdb-attach=yes option to use gdb and lookup
errors reported by valgrind. I am seeing the prompt:

==4853== ---- Attach to GDB ? --- [Return/N/n/Y/y/C/c] ---- ==4853==

But valgrind continues to run without actually stopping at the prompt.
What is causing this?

I don't think I'm doing anything really strange to stdin. It's a console
application with a little shell though, so I'm constantly scanning stdin
for my own input. I suppose that can be a problem?

TTimo

[Valgrind-users] backtraces of leak-checking && dlopened modules

[Dirk M. <dm...@gm...>]

Hi, 

the backtraces of leak checking are useless when dlopened modules are 
interacting. Thats because by the time the leak checking occurs, the 
dlopened modules might have been unloaded again, and valgrind cannot find 
the debug symbols anymore, because the unmap removed the debug symbol table. 

Does anybody have a suggestion for cleanly fixing this?

perhaps it should not unmap the debug symbols unless it really has to (i.e. 
another module maps at the current place?). But even then the leak check 
might fail.. hmm. The only safe way is probably to ensure that addresses 
that were used for dlopened modules are never recycled. 

any idea how to achieve this?


-- 
Dirk

Re: [Valgrind-users] valgrind problems

[Nicholas N. <nj...@ca...>]

On Fri, 20 Jun 2003, Feng Chen wrote:

> ==16963== Thread 18:
> ==16963== Use of uninitialised value of size 4
> ==16963==    at 0x40872B33: des_encrypt2 (in /lib/libcrypto.so.0.9.6b)
> ==16963==
> ==16963== Thread 18:
> ==16963== Use of uninitialised value of size 4
> ==16963==    at 0x408267DD: ssl3_get_record (in /lib/libssl.so.0.9.6b)
> ==16963==    by 0x40826FF3: ssl3_read_bytes (in /lib/libssl.so.0.9.6b)
> ==16963==    by 0x40827FAF: ssl3_get_message (in /lib/libssl.so.0.9.6b)
> ==16963==    by 0x40827A3C: ssl3_get_finished (in /lib/libssl.so.0.9.6b)
> ==16963==
>
> {
>    /lib/libssl.so.0.9.6b
>    Memcheck:Cond
>    obj:/lib/libssl.so.0.9.6b
> }

The suppression kind is wrong, try replacing "Cond" with "Value4".

N

[Valgrind-users] valgrind problems

[Feng C. <fc...@pi...>]

Hi there,

I'm running valgrind to do memcheck on a program that uses OpenSSL, and
having some problems:

a) Before the program finished, it would crash and leave nothing traceable
via gdb:

	program terminated with signal 6, Aborted.
	Cannot access memory at address 0x40302000
	#0  0x4018392f in ?? ()

b) Lots of OpenSSL related reports which may or may not be real problems,
such as

==16963== Thread 18:
==16963== Use of uninitialised value of size 4
==16963==    at 0x40872B33: des_encrypt2 (in /lib/libcrypto.so.0.9.6b)
==16963==
==16963== Thread 18:
==16963== Use of uninitialised value of size 4
==16963==    at 0x408267DD: ssl3_get_record (in /lib/libssl.so.0.9.6b)
==16963==    by 0x40826FF3: ssl3_read_bytes (in /lib/libssl.so.0.9.6b)
==16963==    by 0x40827FAF: ssl3_get_message (in /lib/libssl.so.0.9.6b)
==16963==    by 0x40827A3C: ssl3_get_finished (in /lib/libssl.so.0.9.6b)
==16963==

c) To suppress the OpenSSL error reports - because I'm not going to fix it,
I added some rules in the /usr/local/lib/valgrind/default.supp file.
However, it seems not always working.  For example, when adding the
following to the /usr/local/lib/valgrind/default.supp file, the above
reports still keep coming up in the logs:

{
   /lib/libssl.so.0.9.6b
   Memcheck:Cond
   obj:/lib/libssl.so.0.9.6b
}

{
   /lib/libcrypto.so.0.9.6b
   Memcheck:Cond
   obj:/lib/libcrypto.so.0.9.6b
}

{
   des_encrypt2 (in /lib/libcrypto.so.0.9.6b)
   Memcheck:Cond
   fun:des_encrypt2
}

{
   des_encrypt2 again (in /lib/libcrypto.so.0.9.6b)
   Memcheck:Cond
   fun:des_encrypt2
   obj:/lib/libcrypto.so.0.9.6b
}

Can someone please help?

Thanks a lot!

Feng

Re: [Valgrind-users] SIGSEGV in helgrind

[Jeremy F. <je...@go...>]

On Fri, 2003-06-20 at 02:43, Nicholas Nethercote wrote:
> Helgrind has one or two problems with seg faults, unfortunately... if you
> could narrow down your program to a simple test case, that would be very
> helpful.

This thread went off list.  It turned out to be a trivial problem in
Helgrind's reporting code.  It had already been fixed in CVS.

	J

Re: [Valgrind-users] SIGSEGV in helgrind

[Nicholas N. <nj...@ca...>]

On 17 Jun 2003, Stephane Donze wrote:

> I'm trying to use helgrind on my programs, but the first attempt gave me
> the following messages:
>
> ==11449== Warning: SIGSEGV not in user code; either from syscall kill()
> ==11449==    or possible Valgrind bug.  This message is only shown 3
> times.
> ==11449== Warning: SIGSEGV not in user code; either from syscall kill()
> ==11449==    or possible Valgrind bug.  This message is only shown 3
> times.
> ==11449== Warning: SIGSEGV not in user code; either from syscall kill()
> ==11449==    or possible Valgrind bug.  This message is only shown 3
> times.
>
> The program seems to go on after these messages, but does not produce
> any other output nor helgrind log. I kept it running several minutes
> like this, and nothing happened except that the process takes 100% CPU
> load (about 75% system and 25% user)

Helgrind has one or two problems with seg faults, unfortunately... if you
could narrow down your program to a simple test case, that would be very
helpful.

Thanks.

N

Re: [Valgrind-users] shared memory?

[Nicholas N. <nj...@ca...>]

On 19 Jun 2003, Jeremy Fitzhardinge wrote:

> > I'm trying valgrind on an app I wrote a while ago
> > but that has since had shared memory stuff added to it.
> > Valgrind is complaining about invalid addresses when
> > the app copies stuff to the shared area.  Is this a known
> > problem, or are valgrinded apps able to share memory
> > properly with nonvalgrinded apps?  That's gotta be a toughie
> > to implement...
>
> I think its an oversight more than anything: V simply doesn't add the
> shared memory segment to the list of valid addresses, like it does with
> mmap.  You're right that doing validity checking would be hard, but
> simply treating shared memory as always valid would be OK.

A workaround that might work would be to use one or more of the macros
VALGRIND_MAKE_NOACCESS, VALGRIND_MAKE_READABLE, VALGRIND_MAKE_WRITABLE
when you allocate/deallocate the shared memory.

N

Re: [Valgrind-users] shared memory?

[Jeremy F. <je...@go...>]

On Thu, 2003-06-19 at 18:24, Dan Kegel wrote:
> Hi,
> I'm trying valgrind on an app I wrote a while ago
> but that has since had shared memory stuff added to it.
> Valgrind is complaining about invalid addresses when
> the app copies stuff to the shared area.  Is this a known
> problem, or are valgrinded apps able to share memory
> properly with nonvalgrinded apps?  That's gotta be a toughie
> to implement...

I think its an oversight more than anything: V simply doesn't add the
shared memory segment to the list of valid addresses, like it does with
mmap.  You're right that doing validity checking would be hard, but
simply treating shared memory as always valid would be OK.

	J

[Valgrind-users] shared memory?

[Dan K. <da...@ke...>]

Hi,
I'm trying valgrind on an app I wrote a while ago
but that has since had shared memory stuff added to it.
Valgrind is complaining about invalid addresses when
the app copies stuff to the shared area.  Is this a known
problem, or are valgrinded apps able to share memory
properly with nonvalgrinded apps?  That's gotta be a toughie
to implement...
- Dan

-- 
Dan Kegel
http://www.kegel.com
http://counter.li.org/cgi-bin/runscript/display-person.cgi?user=78045

[Valgrind-users] Problem using valgrind 1.9.6 and also latest from CVS with pthreads

[William D. <cab...@ho...>]

Greetings,

Has anyone seen this before and/or know how to resolve it?
RH8.0 glibc 2.3.2,
I tried with 1.9.6 and also tried with the latest code in cvs.

Thanks,
Bill


> >>SOMPROGRAMHERE: relocation error:
/hobpthread.so:
> >>KLUDGED call to: sem_destroy
> >>/...InstallPath.../lib/valgrind/libpthread.so.0:
> >>undefined symbol: vgPlain_startup
> >>==3906== valgrind's libpthread.so: KLUDGED call to: sem_destroy
> >>==3906== valgrind's libpthread.so: KLUDGED call to: sem_destroy
> >>==3906== valgrind's libpthread.so: KLUDGED call to: sem_destroy
> >>