[Fwd: Re: printf -v variable ignores nullglob]

[Elmar Stellnberger]

> printf -v var "%b" @(hugo); echo "x${var}x"
x/src/m3/libs/m3core/LINUXLIBC6/*.@(m3|i3|ig|mg)x
> set | grep "/src/ezm3/libs/m3core/LINUXLIBC6/*.@(m3|i3|ig|mg)"
> alias | grep "/src/ezm3/libs/m3core/LINUXLIBC6/*.@(m3|i3|ig|mg)"
> pwd
/
> dirs
/
>

    To me it does strongly look like a memory corruption.
* There is absolutely no hint where the string
"/src/m3/libs/m3core/LINUXLIBC6/" could permissibly come from.
*  "/src/m3/libs/m3core/LINUXLIBC6/" has been a previous working
directory but should be present nowhere in memory by now.
* The error occurs in a rather nondeterministic manner.
* It does not occur on startup but right after some time of working.

P.S.: Please do not wipe this under your table. It has occured more than
once.


> --- Begin Message ---
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> Subject: 
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> Re: printf -v variable ignores nullglob
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>
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> Date: 
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> Tue, 15 May 2007 22:06:06 +0200
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> User-agent: 
>
> Thunderbird 2.0.0.0 (X11/20070418)
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>    Chet Ramey wrote:
>
> Elmar Stellnberger wrote:
>   
>
> Configuration Information [Automatically generated, do not change]:
> Machine: i586
> OS: linux
> Compiler: gcc -I/usr/src/packages/BUILD/bash-3.1
> -L/usr/src/packages/BUILD/bash-3.1/../readline-5.1
> Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i586'
> -DCONF_OSTYPE='linux' -DCONF_MACHTYPE='i586-suse-linux'
> -DCONF_VENDOR='suse' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash'
> -DSHELL -DHAVE_CONFIG_H   -I.  -I. -I./include -I./lib   -O2 -march=i586
> -mtune=i686 -fmessage-length=0 -Wall -D_FORTIFY_SOURCE=2 -g
> -D_GNU_SOURCE -DRECYCLES_PIDS -Wall -pipe -g -fbranch-probabilities
> uname output: Linux sonic 2.6.16.21-0.25-default #1 Tue Sep 19 07:26:15
> UTC 2006 i686 i686 i386 GNU/Linux
> Machine Type: i586-suse-linux
>
> Bash Version: 3.1
> Patch Level: 17
> Release Status: release
>
> Repeat By:
> 1. shopt -s nullglob extglob
> 2. echo "x$(printf "%b" @(hugo))x"
> 3. printf -v var "%b" @(hugo); echo "x${var}x"
> # note: no file named hugo is allowed to reside in the current working
> directory
>
> Expected Behaviour:
> 2. xx
> 3. xx
>
> Actual Behaviour:
> 2. xx
> 3. x/current/working/directory/*.@(m3|i3|ig|mg)x
>     
>
> I can't reproduce this with bash-3.1 or bash-3.2.
> ez
> Chet
>
>   
>
>    ** initial Konsole #0 **
>    > shopt -s nullglob extglob
>    > printf -v var "%b" @(hugo); echo "x${var}x"
>    x/src/m3/libs/m3core/LINUXLIBC6/*.@(m3|i3|ig|mg)x
>    > shopt nullglob extglob
>    nullglob        on
>    extglob         on
>    This is in a fact strange since the error does not seem to occur in a newly
>    opened bash session:
>    ** Konsole #1 **
>    > printf -v var "%b" @(hugo); echo "x${var}x"
>    xx
>    Nevertheless I have not shut my computer down since I have reported this bug
>    and the konsole where the nullglob error occurs is still open (Konsole #0)!
>    ** Konsole #2 **
>    > printf -v var "%b" @(hugo); echo "x${var}x"
>    x@(hugo)x
>    > echo "x${var}x"
>    x@(hugo)x
>    Very strange!! I have not found out yet when it does occur and when not.
>    The error has now arised in a another konsole session:
>    ** initial Konsole #0 (still open; konsole of initial bug report) **
>    > printf -v var "%b" @(hugo); echo "x${var}x"
>    x/src/m3/libs/m3core/LINUXLIBC6/*.@(m3|i3|ig|mg)x
>    > echo $var
>    > ..
>    Note: In this example the value of var is corrupted only if it is used
>    within the same line of code!!
>    In #2 var keeps the wrong value.
>
> --- End Message ---