The bug which I will describe
affects the version 3.00 of bash shipped
with Slackware GNU/Linux 10.2 .
This version has been obtained by applying
all the patches available at your site (from
bash30-001 to bash30-016)
plus an additional patch "which should prevent an issue with newer glibc
versions and 2.4.x kernels that leads to a bash hang if bash is
recompiled on such a system" (From the Slackware Changelog).
In attachment you can find this patch
(consisting only of a few lines of code), but,
if you prefer so, then you can download it directly
from any slackware mirror (for instance,
from
http://slackware.ngi.it/slackware-10.2/source/a/bash/patches/
).
Probably this patch is not good, since
it leads to the following problem.
On my machines
(a notebook equipped with i686 cpu (Intel Celeron 2.20GHz stepping 09)
running Slackware GNU/Linux 10.2 with Linux kernel 2.4.31, gcc 3.3.6,
glibc 2.3.5 and an home PC
equipped with Athlon XP1700+
running the same operating system with
the same configuration),
just after starting
a new bash process (i.e. just after starting a
new shell, which can also be the login shell),
if I run a program (for instance an editor,
like jed, emacs, zile...)
and then I suspend it via Ctrl+Z, then
the control does return to the shell:
[EMAIL PROTECTED] jed
the control has not been returned to the shell, just as you can
see here... I can type anything I like but there is not a prompt
and nothing happends
But a "ps aux" command launched on a different
terminal shows that the "jed" editor
has been actually stopped:
ivano 2821 0.0 3.3 10584 7448 ? S 10:13 0:00
/usr/bin/emacs-
ivano 2838 0.0 0.7 2692 1600 pts/0 S 10:30 0:00 bash
ivano 2839 0.0 0.7 3004 1628 pts/0 T+ 10:31 0:00 jed
ivano 2840 2.6 1.2 6224 2792 ? Ss 10:35 0:00 aterm
-sh 60 -t
ivano 2841 1.5 0.7 3308 1716 pts/1 Rs 10:35 0:00 zsh
ivano 2842 0.0 0.3 2568 892 pts/1 R+ 10:35 0:00 ps aux
Please, note that this issue is not related to the
jed editor, since it appears with any console application !
But the really funny stuff is that, if i kill "jed" from another
terminal, then the shell remember anything I typed
on the command line after stopping "jed" and tries to execute it:
the control has not been returned to the shell, just as you can
see here... I can type any text I like but there is not a prompt
and nothing happends [EMAIL PROTECTED] the control has not been
returned to the anell, just as you c
bash: the: command not found
[EMAIL PROTECTED] see here... I can type any text I like but there is
not a prompt
bash: see: command not found
[EMAIL PROTECTED] and nothing happends
Moreover, if I repeat for a second time this little
experiment within the same shell process, then everything
works fine (!!!):
[EMAIL PROTECTED] jed
[1]+ Stopped jed
and I have to start a new shell (for instance, by opening
a new terminal) to re-discover the problem.
There are two remarks that must be done:
1) The problem can be observed both working with the Linux
console and working in an xterm (or rxvt).
2) In an X11 session, if I open a new terminal (xterm or rxvt)
and run an X11 application in this way:
[EMAIL PROTECTED] abiword &
[1] 2884
[EMAIL PROTECTED]
then, until the X11 application is closed, running a command
like 'ls' locks the shell:
[EMAIL PROTECTED] abiword &
[1] 2884
[EMAIL PROTECTED] ls
CBM bash999.glibc-wcontinued-bug.diff.gz mpi.ps
Calendar bin myprojs
Desktop curriculum.pdf ndiff.ps
Esercizi.pdf david phdth
FdA dloaded riassunto_tesi.txt
GNUstep dott.txt secrets
Lipsia esame_finale.txt strtold.c
Lipsia_reply iscrizioni 2005_06.doc tutor
ORARIO I DLI.doc moduloIII.txt
Voti.abw moduloIV.txt
*** NO PROMPT HERE *** What is happening ?
but I can type anything on the terminal
and be sure that, after the closure
of the X11 application previously launched, the shell
will remember it and will try to execute it like a command:
[EMAIL PROTECTED] abiword &
[1] 2884
[EMAIL PROTECTED] ls
CBM bash999.glibc-wcontinued-bug.diff.gz mpi.ps
Calendar bin myprojs
Desktop curriculum.pdf ndiff.ps
Esercizi.pdf david phdth
FdA dloaded riassunto_tesi.txt
GNUstep dott.txt secrets
Lipsia esame_finale.txt strtold.c
Lipsia_reply iscrizioni 2005_06.doc tutor
ORARIO I DLI.doc moduloIII.txt
Voti.abw moduloIV.txt
NO PROMPT HERE *** What is happening ?
[EMAIL PROTECTED] NO PROMPT HERE *** What is happening ?
bash: NO: command not found
[EMAIL PROTECTED]
Of course, If I repeat the experiment within the same shell
process, then everything works fine:
[EMAIL PROTECTED] abiword &
[2] 2889
[EMAIL PROTECTED] ls
CBM bash999.glibc-wcontinued-bug.diff.gz mpi.ps
Calendar bin myprojs
Desktop curriculum.pdf ndiff.ps
Esercizi.pdf david phdth
FdA dloaded riassunto_tesi.txt
GNUstep dott.txt secrets
Lipsia esame_finale.txt strtold.c
Lipsia_reply iscrizioni 2005_06.doc tutor
ORARIO I DLI.doc moduloIII.txt
Voti.abw moduloIV.txt
[EMAIL PROTECTED]
I hope you can guess which part of the source code
of bash (or which patch) is causing the problem. If I was able,
I would try to solve this issue by myself, but this is not the case,
I am really sorry !
Thanks for your care and help,
best regards
Ivano Primi
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