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Re: Crash noticed multiple times using libssh 0.3.4


Hello Aris,
I made changes to our code and added mutex for the read and write blocks for a particular session. During my testing, I still see the libssh crashing at times. Also, I found that it always crashes at the following location: A call to the function ssh_log() is made from function ssh_connect in client.c Could it be that the session is getting corrupted at some point? Can you give me some pointers looking at this Log.

Thanks for your help.
Uday.

t@133 (l@133) terminated by signal ABRT (Abort)
0xff2c16e8: __lwp_kill+0x0008:  bcc,a,pt  %icc,__lwp_kill+0x18  ! 0xff2c16f8
Current function is ssh_log
  67         memset(indent, ' ', min);
--------------------------------------------------

current thread: t@133
 [1] __lwp_kill(0x0, 0x6, 0x0, 0x6, 0xfc00, 0x0), at 0xff2c16e8
[2] raise(0x6, 0x0, 0xff2a4d28, 0xffffffff, 0xff2e8298, 0x6), at 0xff25ff38 [3] abort(0x2d740, 0x1, 0xfeb00ab0, 0xa8244, 0xff2eb298, 0x0), at 0xff240158 [4] os::abort(0x1, 0xfedca58c, 0x1, 0xfedb2000, 0x1858c, 0x18400), at 0xfeaf67b4 [5] VMError::report_and_die(0xfeded4a8, 0x0, 0x1, 0xfed6095b, 0xfed67006, 0xfedf2ce8), at 0xfec088d8 [6] JVM_handle_solaris_signal(0xb, 0xdec7d670, 0xdec7d3b8, 0xafc00, 0x0, 0x0), at 0xfe5b91e8 [7] __sighndlr(0xb, 0xdec7d670, 0xdec7d3b8, 0xfe5b8724, 0x0, 0x1), at 0xff2c0620
 ---- called from signal handler with signal 11 (SIGSEGV) ------
[8] _memset(0xdec7d758, 0x20202020, 0xffffffd7, 0x17, 0xffffd740, 0xdec80000), at 0xff351040 =>[9] ssh_log(session = 0x20202020, verbosity = 538976288, format = 0x20202020 "<bad address 0x20202020>", ...), line 67 in "log.c"
 [10] ssh_connect(session = 0x20202020), line 510 in "client.c"





Uday Tennety wrote:
Hello Aris,
Thanks for your inputs. I'll make the changes to my code adding mutex and let you know if I see any issues.

Thanks,
Uday.

Aris Adamantiadis wrote:
ouch that reply-to catches me every time...
------------------------------------------------------------------------

Subject:
Re: [Fwd: Re: Crash noticed multiple times using libssh 0.3.4]
From:
Aris Adamantiadis <aris@xxxxxxxxxxxx>
Date:
Tue, 19 Jan 2010 09:56:01 +0100
To:
uday.tennety@xxxxxxxxxxxxxx

To:
uday.tennety@xxxxxxxxxxxxxx


Uday Tennety a écrit :
Hello Aris,
I tried initialization using ssh_init() before calling any of the ssh
functions but I still notice the crash. I've attached the relevant log
statements. We're actually using one thread to read from the channel and
another thread to write. Do you think this might be the reason for the
crash? If so, what kind of workarounds do you recommend?

Hi Uday,

I still have to analyze the log you provided, but by what you describe,
the problem is that you're using two libssh function at same time on
functions that are not threadsafe on the same channel.

I would recommend the use of a mutex in your own code, in order to
access only one libssh function at a time (at least on a single session,
there is normally no problem on different sessions).

Do not hesitate to ask if you need any help.

Regards,

Aris



Follow-Ups:
Re: Crash noticed multiple times using libssh 0.3.4Aris Adamantiadis <aris@xxxxxxxxxxxx>
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