Re: (ITS#3908) Assertion in ber_get_next

[hyc@symas.com]

prez@goth.net wrote:
> > You should allow core-dumps to be generated; you should run an
> > unstripped slapd; when the assertion is triggered, you should save
> > the core and the slapd that generated it, so that the core can be
> > inspected while tracking this issue.

>  Its not slapd coring.  Its the user of liblber, so allowing slapd to
>  core would not achieve much, since its not coring.

>  In this case, that would be mod_ldap_userdir, which is loaded as a
>  shared module of apache2.  So I'm not quite sure how to go about
>  this, which is why I was asking if there is a specific log level that
>  I could run slapd at to get more beneficial information (in this
>  case, I would compare timestamps, and paste what slapd says was going
>  on).

Since the assertion occurs in an Apache process, it doesn't seem that 
rasing the debug level on slapd will be of any help.

>  I could compile mod_ldap_userdir debug (non-stripped) all day, but
>  I'm not sure it would really help, since in and of itself it doesn't
>  core, though apache might, but thats quite an undertaking to
>  coordinate all three (openldap, apache and mod_ldap_userdir) to be
>  compiled non-stripped with coredumps enabled, and run it all that way
>  on a production server.
>
>  If you want to check out the code for mod_ldap_userdir, its a single
>  .c file, which they have online at:
> 
http://horde.net/~jwm/software/mod_ldap_userdir/mod_ldap_userdir-1.1.8/mod_ldap_userdir.c

>  Though I can't see where the user BER in there at all, so how its
>  triggering the assertion in liblber, I don't know.  But I also don't
>  know the ins and outs of ldap.

Perhaps you should contact the author of that package (jwm@horde.net) 
for help. You need a way to generate traces from libldap while Apache is 
running. The LDAP debug functions write to stderr by default, but that's 
not available inside Apache. You'll have to fopen your own log file and 
set it with lutil_debug_file().

-- 
  -- Howard Chu
  Chief Architect, Symas Corp.  http://www.symas.com
  Director, Highland Sun        http://highlandsun.com/hyc
  OpenLDAP Core Team            http://www.openldap.org/project/