How to use address sanitizer on a sub process

[Seshadri R]

Hi,

I want to use address sanitizer to profile a program (say A). However, this program is launched as a child of another process (B). I have built the executable for A using the compiler flags :

-fsanitize=address -static-libasan

 and linked the process using the flags 

-fsanitize=address -static-libasan -lasan.

However, when I launch Process A as a subprocess of process B, I am not getting any errors or warnings. 

How do I get the memory leaks in process A using Address Sanitizer?

Thanks and Regards

Seshadri 

[Konstantin Serebryany]

On Mon, May 21, 2018 at 9:01 AM Seshadri R <seshad...@gmail.com> wrote:

Hi,

I want to use address sanitizer to profile a program (say A). However, this program is launched as a child of another process (B). I have built the executable for A using the compiler flags :

-fsanitize=address -static-libasan

 and linked the process using the flags 

-fsanitize=address -static-libasan -lasan.

You should never need -lasan. 

If any piece of documentation tells you to use -lasan, please let us know, we need to remove that. 

-fsanitize=address at both compile and link-time should be sufficient.  

-static-libasan is optional. 

 

However, when I launch Process A as a subprocess of process B, I am not getting any errors or warnings. 

Maybe your program doesn't have bugs? 

 

How do I get the memory leaks in process A using Address Sanitizer?

Are you only looking for memory leaks or for other types of bugs too?

Unlike most other kinds of bugs, memory leaks are reported when the process is exiting, 

see https://clang.llvm.org/docs/LeakSanitizer.html 

 

Thanks and Regards

Seshadri 

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[Yuri Gribov]

On Mon, May 21, 2018 at 5:24 PM, Konstantin Serebryany
<konstantin....@gmail.com> wrote:
>
>
> On Mon, May 21, 2018 at 9:01 AM Seshadri R <seshad...@gmail.com> wrote:
>>
>> Hi,
>>
>> I want to use address sanitizer to profile a program (say A). However,
>> this program is launched as a child of another process (B). I have built the
>> executable for A using the compiler flags :
>> -fsanitize=address -static-libasan
>>
>> and linked the process using the flags
>> -fsanitize=address -static-libasan -lasan.
>
>
> You should never need -lasan.
> If any piece of documentation tells you to use -lasan, please let us know,
> we need to remove that.

Most people pick it up from stackoverflow or blogposts...

[Seshadri R]

Hi Konstantin,

Thanks for your reply.

The programs makefile has those options (maintained by our build team) and I mentioned them to provide complete information. 

Coming back to my question, I have tried to introduce a memory leak by adding the following code: 

    int * pp = new int[1000000000];

    pp = 0;

Even then I did not get any memory leak reported. Is there any other way I can introduce a memory leak to check that my application is built properly and catching memory leaks.

Thanks and Regards

Seshadri R

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[Konstantin Serebryany]

On Tue, May 22, 2018 at 3:25 AM Seshadri R <seshad...@gmail.com> wrote:

Hi Konstantin,

Thanks for your reply.

The programs makefile has those options (maintained by our build team) and I mentioned them to provide complete information. 

Coming back to my question, I have tried to introduce a memory leak by adding the following code: 

    int * pp = new int[1000000000];

    pp = 0;

In this code a memory leak is likely to be optimized away by the compiler -- you may check the resulting object file and most likely you won't see a leak. 

Try a test where the compiler won't remove the call no 'new'

 

Even then I did not get any memory leak reported. Is there any other way I can introduce a memory leak to check that my application is built properly and catching memory leaks.

Thanks and Regards

Seshadri R

On Mon, May 21, 2018 at 9:54 PM, Konstantin Serebryany <konstantin....@gmail.com> wrote:

On Mon, May 21, 2018 at 9:01 AM Seshadri R <seshad...@gmail.com> wrote:

Hi,

I want to use address sanitizer to profile a program (say A). However, this program is launched as a child of another process (B). I have built the executable for A using the compiler flags :

-fsanitize=address -static-libasan

 and linked the process using the flags 

-fsanitize=address -static-libasan -lasan.

You should never need -lasan. 

If any piece of documentation tells you to use -lasan, please let us know, we need to remove that. 

-fsanitize=address at both compile and link-time should be sufficient.  

-static-libasan is optional. 

 

However, when I launch Process A as a subprocess of process B, I am not getting any errors or warnings. 

Maybe your program doesn't have bugs? 

 

How do I get the memory leaks in process A using Address Sanitizer?

Are you only looking for memory leaks or for other types of bugs too?

Unlike most other kinds of bugs, memory leaks are reported when the process is exiting, 

see https://clang.llvm.org/docs/LeakSanitizer.html 

Thanks and Regards

Seshadri 

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