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 Post subject: Singular 3.0.1-1 segment fault/Bus error with Cygwin
PostPosted: Sun Jan 08, 2006 8:43 pm 

Joined: Sun Jan 08, 2006 8:36 pm
Posts: 14
Location: Amherst, MA
In a new Cygwin installation (Cygwin dll version 1.5.18-1)-- under Windows XP Pro SP2 with all updates applied -- if I try to start Singular (version 3.0.1-1), I consistently get error:

Singular : signal 11 (v: 3001/2005111410):
Segment fault/Bus error occurred (r:1136570134)
Please inform the authors
trying to restart...

And Cygwin freezes.

I did submit a bug report but have had no feedback so far. I've tried uninsalling Cygwin entirely, including Singular, and re-installing from a new download (from a different mirror, even), but the same error persists.


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PostPosted: Tue Jan 10, 2006 5:59 am 
Site Admin

Joined: Fri Apr 29, 2005 12:02 am
Posts: 24
Location: Germany, Kaiserslautern
Dear Mr. Eisenberg,

Quote:
On the other hand, if I go to the subdirectory libSingular of the main
cygwin directory and double-click Singular.exe, then Singular does run,
in a DOS command prompt window (although I see message "cannot open
`standard.lib'".


At first, to enable you to use Singular please read

viewtopic.php?t=1475

With this information you should be able to get a full functional Singular within the windows command shell you mentioned.

To the bug itself I can also just refer to

http://cygwin.com/problems.html

Please apologize the delay of the answer, I was moving to the USA during the last week.

Sincerely,

Oliver Wienand
Singular Team


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 Post subject: status of Singular segment faults with cygwin
PostPosted: Wed Jan 11, 2006 10:17 pm 

Joined: Sun Jan 08, 2006 8:36 pm
Posts: 14
Location: Amherst, MA
wienand wrote:
At first, to enable you to use Singular please read

viewtopic.php?t=1475

With this information you should be able to get a full functional Singular within the windows command shell you mentioned.

To the bug itself I can also just refer to

http://cygwin.com/problems.html

Oliver Wienand
Singular Team


OK, after following the instructions in the first (Singular) URL above, I CAN now get Singular to work by the following methods:

1. The Singular (Terminal) windows icon.
2. Any Windows command prompt.
3. In the Cygwin bash shell, typing command TSingular.

On the other hand, I still CANNOT run Singular by the following methods:

(a) In the Cygwin bash shell, typing command Singular: Segment fault/
Bus error
(b) The Singular (rxvt) Windows icon (after starting X using the Start X-
Server Windows icon): Segment fault/Bus error after the bash
window opens.
(c) The Singular (Emacs) Windows icon (after starting X using the Start
X - Server Windows icon)): nothing seems to happen
(d) In Cygwin, after giving command startx, in the Xterm window, typing
command ESingular: Segmentation fault.

The main problem is that I cannot run Singular with emacs.

Upon a recommendation Larry Hall at Cygwin, I installed the latest Cygwin snapshot, but this does not fix anything with respect to Singular that I found broken before.


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 Post subject: status of Singular segment faults with cygwin
PostPosted: Wed Jan 11, 2006 10:18 pm 

Joined: Sun Jan 08, 2006 8:36 pm
Posts: 14
Location: Amherst, MA
wienand wrote:
At first, to enable you to use Singular please read

viewtopic.php?t=1475

With this information you should be able to get a full functional Singular within the windows command shell you mentioned.

To the bug itself I can also just refer to

http://cygwin.com/problems.html

Oliver Wienand
Singular Team


OK, after following the instructions in the first (Singular) URL above, I CAN now get Singular to work by the following methods:

1. The Singular (Terminal) windows icon.
2. Any Windows command prompt.
3. In the Cygwin bash shell, typing command TSingular.

On the other hand, I still CANNOT run Singular by the following methods:

(a) In the Cygwin bash shell, typing command Singular: Segment fault/
Bus error
(b) The Singular (rxvt) Windows icon (after starting X using the Start X-
Server Windows icon): Segment fault/Bus error after the bash
window opens.
(c) The Singular (Emacs) Windows icon (after starting X using the Start
X - Server Windows icon)): nothing seems to happen
(d) In Cygwin, after giving command startx, in the Xterm window, typing
command ESingular: Segmentation fault.

The main problem is that I cannot run Singular with emacs.

Upon a recommendation Larry Hall at Cygwin, I installed the latest Cygwin snapshot, but this does not fix anything with respect to Singular that I found broken before.


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PostPosted: Mon Jan 23, 2006 5:59 pm 
Site Admin

Joined: Fri Apr 29, 2005 12:02 am
Posts: 24
Location: Germany, Kaiserslautern
Dear Singular users,

the issue is resolved. The problem originated from an incorrect character in the path variable. You can try if this applies in your case in the following way:

    1. Start a bash shell
    2. export PATH=/usr/local/bin:/usr/bin:/bin
    3. Singular or ESingular

If Singular is running fine after this, you can check the path variable for uncommon characters. Spaces are okay. To access the path variable please read:

http://www.singular.uni-kl.de/forum/viewtopic.php?t=1475

Sincerely,

Oliver Wienand
Windows Port


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 Post subject:
PostPosted: Mon Jan 23, 2006 6:30 pm 
wienand wrote:
the issue is resolved.

Oliver Wienand
Windows Port


Many thanks to Oliver Wienand for his patient intevention that resolved this problem!


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 Post subject: s
PostPosted: Sun Jul 23, 2006 12:35 am 

Joined: Sun Jan 08, 2006 8:36 pm
Posts: 14
Location: Amherst, MA
wienand wrote:
Dear Singular users,

the issue is resolved. The problem originated from an incorrect character in the path variable. You can try if this applies in your case in the following way:

    1. Start a bash shell
    2. export PATH=/usr/local/bin:/usr/bin:/bin
    3. Singular or ESingular

If Singular is running fine after this, you can check the path variable for uncommon characters. Spaces are okay. To access the path variable please read:

http://www.singular.uni-kl.de/forum/viewtopic.php?t=1475

Sincerely,

Oliver Wienand
Windows Port


Is that PATH correct for Singular 3.0.1-1? I just installed cygwin with Singular (after having to uninstall cygwin from a partition that was getting too full), and in the cygwin tree directory /usr/local/bin is totally empty. The Singular binaries are in /lib/Singular. Moreover, if I try

export PATH=/usr/local/bin:/usr/bin:/bin

I get messages from bash:

bash: /usr/bin: is a directory
bash: /bin: is a directory

Finally, singular is not working in any fashion whatsoever: at the bash shell prompt I get error:

Singular : signal 11 (v: 3001/2005111410):
Segment fault/Bus error occurred (r:1153607477)

This is after setting all the Windows environment variables to what they should be, I think -- in particular, using /lib/Singular (and NOT /usr/lib/Singular, which does not exist) for the value of SINGULAR_BIN_DIR.

I get the same type of error if I try to run singular in a Windows command prompt window.


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PostPosted: Tue Jul 25, 2006 7:13 am 
Site Admin

Joined: Fri Apr 29, 2005 12:02 am
Posts: 24
Location: Germany, Kaiserslautern
It is hard to judge your problem. Can you please send the output of the following call inside a Cygwin terminal

Code:
cygcheck -s -r


to

Code:
singular at mathematik dot uni-kl dot de


The directory /usr/lib/Singular exists only as a POSIX path within Cygwin and not as a physical path on your hardrive. It is linked to the directoy

Code:
%CYGWIN HOME%/lib/Singular


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 Post subject: Re: segment fault
PostPosted: Tue Jul 25, 2006 8:33 pm 

Joined: Sun Jan 08, 2006 8:36 pm
Posts: 14
Location: Amherst, MA
murray wrote:
Is that PATH correct for Singular 3.0.1-1? I just installed cygwin with Singular (after having to uninstall cygwin from a partition that was getting too full), and in the cygwin tree directory /usr/local/bin is totally empty. The Singular binaries are in /lib/Singular. Moreover, if I try

export PATH=/usr/local/bin:/usr/bin:/bin

I get messages from bash:

bash: /usr/bin: is a directory
bash: /bin: is a directory

Finally, singular is not working in any fashion whatsoever: at the bash shell prompt I get error:

Singular : signal 11 (v: 3001/2005111410):
Segment fault/Bus error occurred (r:1153607477)

This is after setting all the Windows environment variables to what they should be, I think -- in particular, using /lib/Singular (and NOT /usr/lib/Singular, which does not exist) for the value of SINGULAR_BIN_DIR.

I get the same type of error if I try to run singular in a Windows command prompt window.


1. I made a really silly mistake when I tried your diagnostic of exporting PATH from within cygwin: I erroneoulsy used semicolons instead of colons to separate paths. Now, if at the bash prompt I do correctly type

export PATH=/usr/local/bin:/usr/bin:/bin

then I CAN start Singular without error using command "singular". That's good!

However, I still get the Segment fault... error if I do not export PATH.

Executing "mount" at the bash prompt shows

V:cygwinbin on /usr/bin type system
V:cygwinlib on /usr/lib type system
V:cygwin on / type system (binmode)

along with entries of the form

d: on /cygdrive/d type system (binmode,noumount)

for each of my partitions.

Here is an excerpt from my windows PATH variable:
v:cygwinbin;v:cygwinusrbin;v:cygwinusrlocalbin;v:cygwinusrX11R6bin;v:cygwinlibsingular;

(I looked at the entire path and see no unusual characters or syntactical errors in it, although of course such might still be there.)

2. Even after doing export PATH, trying to run ESingular from the bash prompt causes a pop-up window "ESingular.exe" with text:

Error: Execution of
/usr/bin/xemacs-21.4.19.exe
-no-init-file
-eval '(progn (setq singular-emacs-home-directory
"/usr/share/Singular/emacs")
(load-file "/usr/share/Singular/emacs/.emacs-singular ")
(singular-other "/usr/lib/Singular/Singular.exe"
"/cygdrive/e/Documents/CygwinHome/" (list ) "singular"))'

3. Still singular also stops with a Segment fault if I try to run itfrom a Windows command prompt. I do have the following Windows environment variables set:

SINGULAR_BIN_DIR=/lib/Singular SINGULAR_CHM_FILE=/usr/share/doc/Singular-3.0.1/doc/Manual.chm
SINGULAR_EXAMPLES_DIR= /usr/share/doc/Singular-3.0.1/examples
SINGULAR_IDX_FILE=/usr/share/doc/Singular-3.0.1/doc/singular.idx
SINGULAR_INFO_FILE=/usr/share/info/singular.info
SINGULAR_ROOT_DIR=/usr/share/Singular


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PostPosted: Wed Jul 26, 2006 12:53 am 
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Joined: Fri Apr 29, 2005 12:02 am
Posts: 24
Location: Germany, Kaiserslautern
Dear Mr Murray,

I have investigated your problem further and can now reproduce the error. As soon as I copy your path to the path variable Singular crashes while starting. I have not figured out, what exactly causes the problem, but I will look into it further. Meanwhile you can do the following to use Singular and ESingular at least a bit more seamingless or at all:

1. Add the line
Code:
export PATH=/usr/local/bin:/usr/bin:/bin

to the files /usr/bin/Singular and /usr/bin/ESingular.

2. Also add the line
Code:
export ESINGULAR_EMACS=/usr/bin/xemacs-21.4.19.exe

to the file /usr/bin/ESingular.

For some reason, the program forgets the first "/". I was not able to reproduce this behavior on my machine and if it works with setting the enviroment variable, I will postpone this problem after I solved the path issue.

After these changes you should be able to use Singular and ESingular from every Cygwin terminal. Please report failure or hopefully success here or to singular at mathematik dot uni-kl dot de.


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PostPosted: Wed Jul 26, 2006 2:57 am 

Joined: Sun Jan 08, 2006 8:36 pm
Posts: 14
Location: Amherst, MA
wienand wrote:
Dear Mr Murray,

... you can do the following to use Singular and ESingular at least a bit more seamingless or at all:

1. Add the line
Code:
export PATH=/usr/local/bin:/usr/bin:/bin

to the files /usr/bin/Singular and /usr/bin/ESingular.

2. Also add the line
Code:
export ESINGULAR_EMACS=/usr/bin/xemacs-21.4.19.exe

to the file /usr/bin/ESingular.



I can confirm that those fixes do work. More precisely:

I assume that, because of the mount
Code:
V:cygwinbin on /usr/bin type system

the files to be edited are actually the ones in in V:cygwinbin.

I did add the export of ESINGULAR_EMACS to /usr/bin/ESingular. And in each of /usr/bin/Singular and /usr/bin/ESingular I inserted the line
Code:
export PATH=/usr/local/bin:/usr/bin:/bin

immediately before the existing line:
Code:
export PATH="/usr/lib/Singular:$PATH"


Now:

(1) The command singular at the bash prompt does run OK (without, of course, my needing to use any export PATH... command first in bash.

(2) Provided of course I first start x (e.g., using the batch file startxserver.bat from the supplied shortcut in the Singular CAS startup folder), the command ESingular at the bash prompt now also works.

(3) The shortcut "Singular (Emacs)" after shortcut "Start X" also runs OK.

(4) The shortcut "Singular (Emacs and X-Server) (experimental)" seems to do nothing useful: It does start bash.exe without any bash window opening, and bash.exe almost immediately closes. (I followed this through Sysinternals Process Explorer.)


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PostPosted: Wed Jul 26, 2006 3:06 am 

Joined: Sun Jan 08, 2006 8:36 pm
Posts: 14
Location: Amherst, MA
murray wrote:
I can confirm that those fixes do work....


Also now:

(5) Shortcut "Singular (rxvt)" also runs Singular OK.


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PostPosted: Wed Aug 02, 2006 6:34 pm 
Site Admin

Joined: Fri Apr 29, 2005 12:02 am
Posts: 24
Location: Germany, Kaiserslautern
There is an error in the Shortcut "Singular (Emacs and X-Server)". You can correct it, when you rightclick on it and choose options. Now change the entry in Target from
Code:
C:ProgrammeCygWinusrX11R6binrun.exe bash -l -c "/usr/share/lib/Singular/startxserver.bat && sleep 1 &&  ESingular"

to
Code:
C:ProgrammeCygWinusrX11R6binrun.exe bash -l -c "/usr/lib/Singular/startxserver.bat && sleep 1 &&  ESingular"


It will be fixed in the upcomming 3-0-2 release. I still have no solution for the path problem.


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PostPosted: Wed Aug 02, 2006 9:39 pm 

Joined: Sun Jan 08, 2006 8:36 pm
Posts: 14
Location: Amherst, MA
wienand wrote:
There is an error in the Shortcut "Singular (Emacs and X-Server)". {Fix as in my previous posting.}

Yes, that shortuct change works.


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