[ace-bugs] ACE_Svc_Handler handle_input not called in some scenarios randomly when using ACE_SSL_Sock_Stream and ACE_Acceptor

Tue Apr 14 04:12:01 CDT 2020

Hi Johnny,

I downloaded the latest ACE 6.5.8, built it and rebuilt my application with this latest ACE.

I ran the same tests and found the issue still exists.

Regards,
Nagesh

From: Johnny Willemsen <jwillemsen at remedy.nl>
Sent: Tuesday, April 14, 2020 2:22 PM
To: Somisetty, Nagesh <NSomisetty at tnsi.com>; ace-bugs at list.isis.vanderbilt.edu
Cc: Zhao, Changchun <czhao at tnsi.com>; Santhappanavara, Sharath <SSanthappanavara at tnsi.com>; Gupta, Ajay <agupta at tnsi.com>
Subject: Re: [ace-bugs] ACE_Svc_Handler handle_input not called in some scenarios randomly when using ACE_SSL_Sock_Stream and ACE_Acceptor

Hi,

6.5.0 is the latest minor, 6.5.8 is the latest micro but not much has
very likely changed in this area.

Please try to extend/add a unit test under ACE_wrappers/tests to
reproduce this issue.

Regards,

Johnny Willemsen
Remedy IT
http://www.remedy.nl<http://www.remedy.nl>

On 4/13/20 2:59 PM, Somisetty, Nagesh wrote:
> Thanks Johnny.
>
>
>
> I’ve also tried with the ACE 6.5.0, but it did not help. I was still
> observing the same issues as reported in the PRF.
>
>
>
> Regards,
>
> Nagesh
>
>
>
> *From:*Johnny Willemsen <jwillemsen at remedy.nl<mailto:jwillemsen at remedy.nl>>
> *Sent:* Monday, April 13, 2020 6:00 PM
> *To:* Somisetty, Nagesh <NSomisetty at tnsi.com<mailto:NSomisetty at tnsi.com>>;
> ace-bugs at list.isis.vanderbilt.edu<mailto:ace-bugs at list.isis.vanderbilt.edu>
> *Cc:* Zhao, Changchun <czhao at tnsi.com<mailto:czhao at tnsi.com>>; Santhappanavara, Sharath
> <SSanthappanavara at tnsi.com<mailto:SSanthappanavara at tnsi.com>>; Gupta, Ajay <agupta at tnsi.com<mailto:agupta at tnsi.com>>
> *Subject:* Re: [ace-bugs] ACE_Svc_Handler handle_input not called in
> some scenarios randomly when using ACE_SSL_Sock_Stream and ACE_Acceptor
>
>
>
> Hi,
>
> Thanks for using the PRF form. 6.2.0 is already pretty old, can you trie
> ACE 6.5.8 which you can download from
> http://download.dre.vanderbilt.edu<http://download.dre.vanderbilt.edu>, that is the most recent micro release.
>
> Regards,
>
> Johnny Willemsen
>
> Remedy IT
>
> http://www.remedy.nl<http://www.remedy.nl>
>
> On 4/13/20 11:28 AM, Somisetty, Nagesh wrote:
>
> ACE VERSION: 6.2.0
>
> HOST MACHINE and OPERATING SYSTEM: RHEL Server 6.8
> If on Windows based OS's, which version of WINSOCK do you
> use?:
>
> TARGET MACHINE and OPERATING SYSTEM, if different from HOST: RHEL
> Server 6.8
> COMPILER NAME AND VERSION (AND PATCHLEVEL): g++ (GCC) 4.4.7 20120313
> (Red Hat 4.4.7-3)
>
> THE $ACE_ROOT/ace/config.h FILE [if you use a link to a platform-
> specific file, simply state which one]:
>
> THE $ACE_ROOT/include/makeinclude/platform_macros.GNU FILE [if you
> use a link to a platform-specific file, simply state which one
> (unless this isn't used in this case, e.g., with Microsoft Visual
> C++)]:
>
> CONTENTS OF $ACE_ROOT/bin/MakeProjectCreator/config/default.features
> (used by MPC when you generate your own makefiles):
>
> AREA/CLASS/EXAMPLE AFFECTED:
> ACE_Svc_Handler handle_input not called (in some cases) when using
> ACE_SSL_Sock_Stream and ACE_Acceptor
>
> DOES THE PROBLEM AFFECT:
> COMPILATION?
> LINKING?
> On Unix systems, did you run make realclean first?
> EXECUTION?
> OTHER (please specify)?
> Described problem affects the EXECUTION of the application
>
> SYNOPSIS:
> ACE_Svc_Handler handle_input not called in some scenarios when using
> ACE_Acceptor and ACE_SSL_Sock_Stream
>
> DESCRIPTION:
> 1) I have an ACE_Acceptor based server application that works either
> as a TCP or TLS server.
> 2) The TCP and TLS services are defined as below,
> typedef ACE_Acceptor<TCPServer, ACE_SOCK_ACCEPTOR> TCPService;
> typedef ACE_Acceptor<TLSServer, ACE_SSL_SOCK_ACCEPTOR> TLSService;
> where TCPServer and TLSServer are derived from ACE_Svc_Handler as below
> class TCPServer : public ACE_Svc_Handler<ACE_SOCK_STREAM,
> ACE_NULL_SYNCH>
> class TLSServer : public ACE_Svc_Handler<ACE_SSL_SOCK_STREAM,
> ACE_NULL_SYNCH>
> Both these TCPServer and TLSServer have implemented the handle_input
> callbacks for handling of incoming events from the socket.
> 3) Our observation is that while using the TLSServer, we see that
> the handle_input is not called in a few cases as listed below.
> a) When the application attempts to do a peer().recv(buff,len) on
> receiving a handle_input and the application buffer size remaining
> is smaller than the number of bytes available on the socket to be
> read, only the number of bytes that can be read into the buffer are
> actually read. After this the application expects another
> handle_input for the remaining bytes that are still on the socket
> that are yet to be read. In this scenario, we never receive the
> subsequent handle_input event so that we can do the next
> peer().recv(buf,len) call to read the remaining bytes from the
> socket. As a workaround for this, we changed the buffer allocation
> logic to ensure the application doesn't wait for the next
> handle_input if there are more bytes than the remaining buffer size.
> We solved this problem with the workaround, but we encountered the
> issues described in 3b below.
> b) On running load tests with a TLS client which keeps sending https
> requests continuously, we found that the server randomly freezes
> after anywhere between 1 and 30 minutes and when we check it looks
> like we never received a handle_input event at the TLSServer. There
> is no logic on the client that causes it to stop sending requests.
> So, it has to be something to do with the handle_input events not
> being notified to the application.
> 4) Please note that the issues 3a and 3b are not observed while
> using TCPServer and TCP clients. The logic in the handle_input for
> both TCP and TLS is exactly the same.
>
>
> REPEAT BY:
> [What you did to get the error; include test program or session
> transcript if at all possible. ]
>
> SAMPLE FIX/WORKAROUND:
> No fix available. Looking for a solution or an explanation.
>
> ------------------------------------------------------------------------
>
> This email has been scanned for email related threats and delivered
> safely by Mimecast.
> For more information please visit http://www.mimecast.com<http://www.mimecast.com>
>
> ------------------------------------------------------------------------
>
>
>
> _______________________________________________
>
> ace-bugs mailing list
>
> ace-bugs at list.isis.vanderbilt.edu<mailto:ace-bugs at list.isis.vanderbilt.edu> <mailto:ace-bugs at list.isis.vanderbilt.edu>
>
> http://list.isis.vanderbilt.edu/cgi-bin/mailman/listinfo/ace-bugs<http://list.isis.vanderbilt.edu/cgi-bin/mailman/listinfo/ace-bugs>
>
>
>
> ------------------------------------------------------------------------
> This email has been scanned for email related threats and delivered
> safely by Mimecast.
> For more information please visit http://www.mimecast.com<http://www.mimecast.com>
> ------------------------------------------------------------------------
---------------------------------------------------------------------------------------
 This email has been scanned for email related threats and delivered safely by Mimecast.
 For more information please visit http://www.mimecast.com
---------------------------------------------------------------------------------------
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://list.isis.vanderbilt.edu/pipermail/ace-bugs/attachments/20200414/d4d750b6/attachment-0001.html>