Re: problem: ac_shell and ldap user

Finally, we have found a way to prevent the described failure:

    Running the "nscd" daemon avoids the segmentation fault.

NSCD seems to be the solution to the problem. NSCD caches nameservice
requests (the nameservice itself is configured via nsswitch.conf).

-- Johannes Wolkerstorfer.

Johannes Wolkerstorfer wrote:
> We have a problem running the Cadence pks_shell synthesizer under
> Redhat
> 8.0: It will produce a segmentation fault and prompt:
>
>     "==> ERROR:   An unrecoverable exception has occurred (SEGV)."
>
> This is not a generell problem because other Cadence software
> products (e.g. ncsim) run without any problem.
>
> We use the following versions:
>     pks_shell:    @(#)CDS: pks_shell v05.10-s071+2 (32bit) 06/03/03
> 02:28 (Linux 2.4)
>     RedHat:    Linux version 2.4.18-14
> ([EMAIL PROTECTED]) (gcc version 3.2 20020903 (Red
> Hat Linux 8.0 3.2-7)) #1 Wed Sep 4 13:35:50 EDT 2002
>
> The problem seems to be related to LDAP users: running pks_shell as
> root works fine because the root user is defined in local files
> (/etc/passwd, /etc/shadow). All other users are LDAP users who face
> the problem described above. The assumption that LDAP causes the
> problem stems from tracing the execution of pks_shell by the "strace"
> tool which monitors system calls.
>
> We have also verified that all relevant files for user authentication
> and DNS are readable by normal users to eliminate a trivial cause for
> the problems described:    /etc/nsswitch.conf,    /etc/resolv.conf,
> /etc/ldap.conf,    /etc/passwd. The shared objects in use (.so files)
> have read and execution rights for normal users too.
>
> So we assume that the segmentation fault might be caused by a
> programming error. Has somebody else faced this problem? Or even has
> got a solution for it?
>
> Kind regards and Thanks in advance,
> Johannes Wolkerstorfer
>
> ----------------------------------------------------------------
> Johannes Wolkerstorfer   <[EMAIL PROTECTED]>
> Institute for Applied Information Processing and Communications,
> Graz University of Technology, Inffeldg. 16a, 8010 Graz, Austria
> tel: +43 316 873-5515  fax: +43 316 873-5520  http://www.iaik.at