Re: [Bashdb-devel] bashdb 3.1-0.08 test failures under cygwin

[Rocky B. <roc...@gm...>]

I spent a little time looking at this after a very long day at work. Alas
I'm too tired to investigate further so I'll just report what I know at
present.

In short, as best as I can tell I think this is a bug in bash. Details are
below, but if things were working before and with the latest round of
patches things got broken, it would indicate that either bash introduced a
bug or there is something invalid that bashdb is doing  that causes bash to
behave badly. Although I tried this on cygwin, but it  would be interesting
to try to compile on a different platform to see if similar failures occur.

Some details follow. At the line mentioned, line 944 of dbg-cmd.inc, I
turned on set -x tracing. Basically I added this:
  export PS4='(${BASH_SOURCE}:${LINENO}): ${FUNCNAME[0]}\n'
  set -x
and a matching set +x later on. The attached patch might be of help here.

To run just the failing program one can go into the test directory and run
"./brkpt2.tests"

Here is what I see near the failure:

...
+ ### another x command...
+ x j
(((((../dbg-cmds.inc:946): _Dbg_do_x
_Dbg_is_var j
(((((../dbg-fns.inc:126): _Dbg_is_var
declare -p j
(((((../dbg-fns.inc:127): _Dbg_is_var
[[ 0 != 0 ]]
(((((../dbg-fns.inc:130): _Dbg_is_var
echo 1
((((../dbg-cmds.inc:946): _Dbg_do_x
((  declare -i j="1"
1  ))
../dbg-cmds.inc: line 946: declare -i j="1"
1 : syntax error in expression (error token is "j="1"
1 ")

What's wrong here is that line 946 is not "(( declare -i j="1" .... but

 if (( `_Dbg_is_var $_Dbg_expr` )) ; then

So what seems to be happening is that the wrong text is getting substituted
back inside the backtick. What you should have seen was (( 1 )) because
there was that "echo 1".  Interestingly whenever _Dbg_is_var decides to run
"echo 0" instead of "echo 1", that does get substituted back correctly.

I'll attach a log of my run. Finally, I don't know if this is related, but I
seem to be getting "out of resource" errors after running the tests.

      5 [main] sh 64760 fork: child -1 - CreateProcessA failed, errno 11
../dbg-pre.inc: fork: Resource temporarily unavailable
      5 [main] sh 64676 fork: child -1 - CreateProcessA failed, errno 11

With Windows ,one never knows what's going on.




On 4/19/07, Eric Blake <eb...@by...> wrote:
>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> I was trying to upgrade the cygwin installation of bashdb to the latest
> release, and encountered 2 test failures atop bash-3.2.15.  I'm not
> familiar enough with the bashdb sources to know where to look for the
> cause of these two failures, but since they all mention dbg-cmds.inc line
> 944, I wonder if there is a bug there.  Any ideas?
>
> checking brkpt1...
> checking brkpt2...
> - --- /home/eblake/bashdb-3.1_0.08-1/build/test/brkpt2.check    2007-04-19
> 06:42:53.453125000 -0600
> +++ /home/eblake/bashdb-3.1_0.08-1/src/bashdb-3.1-0.08/test/brkpt2.right
> 2007-01-19 20:43:30.000000000 -0700
> @@ -195,19 +195,13 @@
> 11:    local -i j=i+1
> + ### another x command...
> + x j
> - -../dbg-cmds.inc: line 944: ((: declare -i j="1"
> - -1 : syntax error in expression (error token is "j="1"
> - -1 ")
> - -1
> +declare -i j="1"
> + ### another x command (+5 than value above) ...
> + x j+5
> 6
> + ### x command of string y
> + x y
> - -../dbg-cmds.inc: line 944: ((: declare -- y="b"
> - -1 : syntax error in expression (error token is "y="b"
> - -1 ")
> - -y
> +declare -- y="b"
> + ### x of a function ...
> + x fn2
> fn2 ()
> FAIL: run-brkpt
>
> - --- /home/eblake/bashdb-3.1_0.08-1/build/test/command.check   2007-04-19
> 06:44:10.843750000 -0600
> +++ /home/eblake/bashdb-3.1_0.08-1/src/bashdb-3.1-0.08/test/command.right
> 2006-12-03 15:30:52.000000000 -0700
> @@ -20,10 +20,7 @@
> + continue
> Breakpoint 1 hit (1 times).
> + x x
> - -../dbg-cmds.inc: line 944: ((: declare -- x="22"
> - -1 : syntax error in expression (error token is "x="22"
> - -1 ")
> - -22
> +declare -- x="22"
> (dbg-test1.sh:23):
> 23:    y=23
> + #
> FAIL: run-command
>
> - --
> Don't work too hard, make some time for fun as well!
>
> Eric Blake             eb...@by...
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