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Subject: Re: Reg Core dump in libssh2 with SFTP in main_arena () from /lib64/libc.so.6 (fwd)

Re: Reg Core dump in libssh2 with SFTP in main_arena () from /lib64/libc.so.6 (fwd)

From: Ganga <gangabhavanip_at_gmail.com>
Date: Tue, 12 Jun 2012 15:10:16 +0530

Hi Daniel and Team,

The libssh2 version we are using is libssh2-1-0.19.0

This core dump is occuring very rarely. So as suggested below are the
flow of calls we are using in our code.

Please provide some workaround.

BR,
Ganga

On 6/8/12, Daniel Stenberg <daniel_at_haxx.se> wrote:
> FYI,
>
> Forwarded with permission.
>
> --
>
> / daniel.haxx.se
>
> ---------- Forwarded message ----------
> Date: Wed, 6 Jun 2012 12:43:43
> From: Ganga <gangabhavanip@...>
> Subject: Reg Core dump in libssh2 with SFTP in main_arena () from
> /lib64/libc.so.6
>
> Hi Daniel,
>
> I am getting the following Segmentation fault when using libssh2
> functions in my code.
>
> Currently we are using version libssh2.so.1.0.0
>
>
> Below is the backtrace from my code
>
> #0 0x00007f78d04195b8 in main_arena () from /lib64/libc.so.6
> #1 0x00007f78d08ae910 in libssh2_packet_read () from
> /usr/lib64/libssh2.so.1
> #2 0x00007f78d089f436 in libssh2_packet_require_ex ()
> from /usr/lib64/libssh2.so.1
> #3 0x00007f78d089e2e1 in libssh2_kex_exchange () from
> /usr/lib64/libssh2.so.1
> #4 0x00007f78d08a5e98 in libssh2_session_startup ()
> from /usr/lib64/libssh2.so.1
> #5 0x00000000004dea3d in SftpAdapterClass::sftpInitiate(char const*,
> int, char const*, char const*, bool) ()
> #6 0x00000000004ded60 in SftpAdapterClass::sftpConnect(char const*,
> int, char const*, char const*, bool) ()
> #7 0x00000000004d4d13 in SSHFTPIV2::ftpConnect(std::string const&,
> std::string const&, std::string const&, std::string const&, bool) ()
> #8 0x000000000048e9a4 in FTPIV2::checkConnection() ()
> #9 0x00000000004765a3 in TransDest::checkConnection() ()
> #10 0x0000000000476ab8 in TransDest::handleMessage(TransDest::setEvMsg*) ()
> #11 0x000000000047a5eb in TransDest::svc() ()
> #12 0x00007f78d1b41d97 in ACE_Task_Base::svc_run(void*) ()
> from /usr/lib64/libACE.so.5
> #13 0x00007f78d1b43435 in ACE_Thread_Adapter::invoke() ()
> from /usr/lib64/libACE.so.5
> #14 0x00007f78d15ec696 in start_thread () from /lib64/libpthread.so.0
> #15 0x00007f78d0193cbd in clone () from /lib64/libc.so.6
> ---Type <return> to continue, or q <return> to quit---
> #16 0x0000000000000000 in ?? ()
>
> Here we are trying to checkconnection which internally calls the stfp
> protocol that internally uses libssh2.
>
> The below is the flow of the calls we performed
>
> sock = socket(AF_INET, SOCK_STREAM, 0);
> if (sock == -1)
> {
> }
>
> // Getting the socket properties before setting the socket non
> blocking
> int arg1 = fcntl( sock, F_GETFL, NULL );
>
> // Setting the socket non blocking
> result = fcntl( sock, F_SETFL, O_NONBLOCK);
>
> // Connecting to the remote ip address
> result = connect(sock, (struct
> sockaddr*)(&server),sizeof(struct sockaddr_in));
>
> if (result != 0)
> {
> select( sock+1, 0, &writefdSet, 0,
> &tv )
> }
>
> session = libssh2_session_init();
> if(!session)
> {
> }
>
> rc = libssh2_session_startup(session, sock);
>
> if(rc)
> {
> libssh2_session_disconnect(session, "Normal Shutdown,
> Thank you for playing");
> libssh2_session_free(session);
> close(sock);
> sock = -1;
> session=NULL;
> }
> libssh2_hostkey_hash(session, LIBSSH2_HOSTKEY_HASH_SHA1);
>
>
> Please guide me in providing the solution for this.
>
> Thanking you in Advance
> Warm Regards
> Ganga
> _______________________________________________
> libssh2-devel http://cool.haxx.se/cgi-bin/mailman/listinfo/libssh2-devel
>
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Received on 2012-06-12

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