[Fwd: Re: Crash noticed multiple times using libssh 0.3.4]

[Aris Adamantiadis <aris@xxxxxxxxxxxx>]

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• Subject: Re: Crash noticed multiple times using libssh 0.3.4
• From: Aris Adamantiadis <aris@xxxxxxxxxxxx>
• Date: Sat, 16 Jan 2010 11:41:48 +0100
• To: uday.tennety@xxxxxxxxxxxxxx

Hi Uday,

Could you provide me the backtrace that is located in the java crash log file ? I'm interested to know exactly where in libssh the broken memset happen. Just cut anything you find not relevant and/or confidential.

Please also call the global function once before launching the libssh threads :

int ssh_init(void);

This function initializes all the global structures in libssh, otherwise it's called right under ssh_connect, causing known reentrancy problems. Next version of libssh will be linked with threading and mutexes libs, but meanwhile the best solution is to call ssh_init() at the begin of your program.

There is no other known reentrancy bugs.

I'm looking forward your logfile.

Regards,

Aris

Uday Tennety a écrit :

Hello,

In our development environment, we noticed that some error in libssh library resulted in crashing our application server. We saw this issue a few times. Our scenario is: We are using libssh 0.3.4 and noticed the crash when our libssh client was trying to connect to multiple ssh servers running on various network elements. Before we dive deep into the code, I wanted to find out if there is a known threading issue in 0.3.4 with a libssh client trying to connect to multiple ssh servers? Also, it would really help if someone can point me in the right direction looking at the error. I really appreciate your time and help.

Thanks,
Uday.



Sample Error:
-------------

[func] leaving function ssh_disconnect line 690 in /home/public/temp/libssh-0.3.4/libssh/client.c [func] entering function ssh_cleanup line 91 in /home/public/temp/libssh-0.3.4/libssh/session.c [func] entering function channel_free line 724 in /home/public/temp/libssh-0.3.4/libssh/channels.c [func] leaving function channel_free line 755 in /home/public/temp/libssh-0.3.4/libssh/channels.c

Current time:Fri Jan 15 16:10:29 PST 2010

Remote host is 10.2.32.95 and remote port is 22[func] entering function ssh_connect line 489 in /home/public/temp/libssh-0.3.4/libssh/client.c [func] entering function ssh_connect_host line 184 in /home/public/temp/libssh-0.3.4/libssh/connect.c [func] leaving function ssh_connect_host line 249 in /home/public/temp/libssh-0.3.4/libssh/connect.c [func] leaving function ssh_connect_host line 258 in /home/public/temp/libssh-0.3.4/libssh/connect.c

#
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0xff351040, pid=5438, tid=149
#
# JRE version: 6.0_16-b01
# Java VM: Java HotSpot(TM) Server VM (14.2-b01 mixed mode solaris-sparc )
# Problematic frame:
# C  [libc_psr.so.1+0x1040]  memset+0x140
#
# An error report file with more information is saved as:
# /home/IEM/Repository/hs_err_pid5438.log
#
# If you would like to submit a bug report, please visit:
#   http://java.sun.com/webapps/bugreport/crash.jsp

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