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nss problems

From: Marco Gerards
Subject: nss problems
Date: Wed, 03 Mar 2004 22:19:01 +0100
User-agent: Gnus/5.1006 (Gnus v5.10.6) Emacs/21.3 (gnu/linux)


Ognyan Kulev reported a problem with the stack size of glibc.  This is
the mail he sent:


Trying to use reportbug I found that some libc routines may require 
larger stack sizes[1].  In this particular case, 
resolv/nss_dns/dns-host.c wants 64k buffer for its operation and 
reportbug crashes.  Unfortunately, we have small stacks[2].

[1] http://www.cygwin.com/ml/libc-hacker/2002-10/msg00038.html
[2] http://mail.gnu.org/archive/html/bug-hurd/2002-09/msg00143.html

It would be good to make __libc_alloca_cutoff smaller.  For example, 

As Ognyan says, this can cause some dns problems.  Perhaps this
explains why I am having some problems with DNS related calls:

- ftpfs segfaults when calling gethostbyname_r.  According to Alfred
  that does not happen in his test program.  I guess that test program
  did not use the stack that much...

- Emacs hangs if it cannot find /etc/hosts to lookup `localhost'.  (I
  found that out when crosshurd did not copy my /etc/hosts.

And there were some other places where I noticed some weird
behavior.  I will report it when I find some more problems.  And I am
not sure if the small stack causes the problems I encountered, but it
is a good place to start when someone wants to fix these bugs.


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