Re: Deep bug

[Jason Bechtel <jason@xxxxxxxxxxx>]

Howdy,

Replying to my own initial message...

My client has now seen what he believes to be the same bug when using
the common AS/400 "dfu" utility.  He was examining a file and moving
through screens when the emulator died a similar death.  Here is what he
said he did:

strdfu<Enter>
5<Enter>
{choose the file, library(?), and member}
PgDn  (shows fields for first record)
Enter (shows more fields)
Enter (shows more fields)
Enter (shows more fields)
* crashes here *
Enter (shows more fields and loops back to the beginning)
F3 (End)

I'm not an AS/400 guy, so I have no idea if this even makes sense.  He
says you need a table that has many fields in order to have to press
three <Enter>'s.  He thinks it might be layering the "windows" and that
the third one is like the third window in their application.  This would
substantiate his intuition that it is related to multiple layers of
"windows".

At least this one is easier to reproduce...  :)

Jason


Jason Bechtel wrote:
> 
> Hi all,
> 
> A client of mine using the xt5250 and tn5250 applications compiled from
> source (version 0.15.6) has encountered a reproduceable crash with core
> dump.  From their informal observation, it appears that the problem
> occurs when they are three "screens" deep (you know, those little AS400
> ASCII "windows").  Here is the message that appears when tn5250 is run
> out of a terminal:
> 
>         Assertion tn5250_attribute (attr) failed at wtd.c, line 329.  A
>         borted (core dumped)
> 
> Sure enough, that part of the code looks to be an assertion:
> 
>     298 /****i* lib5250/tn5250_wtd_context_write_field
>     299  * NAME
>     300  *    tn5250_wtd_context_write_field
>     301  * SYNOPSIS
>     302  *    tn5250_wtd_context_write_field (This, field, attr);
>     303  * INPUTS
>     304  *    Tn5250WTDContext *   This       -
>     305  *    Tn5250Field *        field      -
>     306  *    unsigned char        attr       -
>     307  * DESCRIPTION
>     308  *    Write the SF order and the field's information.
>     309  *****/
>     310 static void tn5250_wtd_context_write_field (Tn5250WTDContext
> *This, Tn5250Field *field, unsigned char attr)
>     311 {
>     312    TN5250_LOG (("Writing SF order in stream data.\n"));
>     313
>     314    tn5250_wtd_context_putc (This, SF);
>     315
>     316    /* Put the field format word. */
>     317    if (field->FFW != 0) {
>     318       tn5250_wtd_context_putc (This, (unsigned char)(field->FFW
> >> 8));
>     319       tn5250_wtd_context_putc (This, (unsigned char)(field->FFW
> & 0x00ff));
>     320
>     321       /* Put the field control word(s). */
>     322       if (field->FCW != 0) {
>     323          tn5250_wtd_context_putc (This, (unsigned
> char)(field->FCW >> 8));
>     324          tn5250_wtd_context_putc (This, (unsigned
> char)(field->FCW & 0x00ff));
>     325       }
>     326    }
>     327
>     328    /* Put the screen attribute. */
> *-> 329    TN5250_ASSERT (tn5250_attribute (attr));
>     330    tn5250_wtd_context_putc (This, attr);
>     331
>     332    /* Put the field length. */
>     333    tn5250_wtd_context_putc (This, (unsigned char)(field->length
> >> 8));
>     334    tn5250_wtd_context_putc (This, (unsigned char)(field->length
> & 0x00ff));
>     335 }
> 
> Anyone have any ideas what might be causing this error?  Has this
> already been found and solved (new to the list)?  How difficult would
> this be to debug?

-- 
  __________________________________  __________________________
 /         Jason Bechtel            \/  Phone:  (419) 861-3331  \
/       Unique Systems, Inc.         \    FAX:  (419) 861-3340   \
) 6920 Spring Valley Drive, Ste. 106 (                           (
\        Holland, OH 43528           / mailto:jason@uniqsys.com  /
 \__________________________________/\__________________________/
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