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Bug#516212: marked as done (nscd: init script doesn't flush cache during restart/reload)

Your message dated Sat, 21 Feb 2009 10:47:31 +0000
with message-id <E1LapON-00049d-Nl@ries.debian.org>
and subject line Bug#516212: fixed in glibc 2.9-2
has caused the Debian Bug report #516212,
regarding nscd: init script doesn't flush cache during restart/reload
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner@bugs.debian.org

516212: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=516212
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message ---
Package: nscd
Version: 2.7-10

I think I have found a couple closely related long-standing bugs related
to flushing the caches in the init script for nscd:

1. Can't flush the cache when nscd isn't running

Using /etc/init.d/nscd reload|restart is supposed to invalidate, or
flush, the caches for the passwd, group and hosts databases.  However
the way the init script works is that it first stops nscd, then tries to
flush the caches, and then it restarts nscd.  However, the --invalidate
flag seems to require that nscd be running and it silently fails to do
anything when nscd isn't running!  (the silent part seems like an nscd bug to me!)

2. nscd ignores more than one --invalidate option

The init script currently tries to flush the caches for the passwd,
group, and hosts tables all with one command.  However nscd seems to
silently ignore more than one instance of the --invalidate flag, so only
the passwd table would be flushed using the current init script, *if*
nscd was even running (see bug #1 above).

I would be glad to provide a transcript of 'nscd -g' invocations to show
what I'm seeing if that would be helpful.

The fix
1. Run the --invalidate commands before stopping nscd or after
restarting it.
2. Run a separate --invalidate command for each table.
3. [Optional] convince upstream glibc developers to make nscd complain
loudly when more than one --invalidate flag is passed, and when
--invalidate is attempted when nscd isn't even up and running just like 'nscd -g' fails loudly when nscd isn't running.

Here is a patch against /etc/init.d/nscd from the latest experimental
nscd v2.9-0exp2 which fixes the problems for me:
--- nscd	2009-01-20 10:17:49.000000000 -0500
+++ nscd.fixed	2009-02-19 15:32:04.602864750 -0500
@@ -93,8 +93,10 @@
 	log_daemon_msg "Restarting $DESC" "$NAME"
+	for table in passwd group hosts; do
+		$DAEMON --invalidate $table
+	done
-	$DAEMON --invalidate passwd --invalidate group --invalidate hosts
 	case "$?" in

FYI, I first noticed the behavior on an Ubuntu Server 8.04 system with nscd
version 2.7-10ubuntu4, then I was able to reproduce it on an old Debian
server we have that has nscd version 2.3.6-15. It seems hard to believe that these bugs have been there for 2.5 years in Debian and Ubuntu! :)

Thanks in advance for your help getting this straightened out for me and everyone else!


--- End Message ---
--- Begin Message ---
Source: glibc
Source-Version: 2.9-2

We believe that the bug you reported is fixed in the latest version of
glibc, which is due to be installed in the Debian FTP archive:

  to pool/main/g/glibc/glibc-doc_2.9-2_all.deb
  to pool/main/g/glibc/glibc-source_2.9-2_all.deb
  to pool/main/g/glibc/glibc_2.9-2.diff.gz
  to pool/main/g/glibc/glibc_2.9-2.dsc
  to pool/main/g/glibc/libc6-dbg_2.9-2_amd64.deb
  to pool/main/g/glibc/libc6-dev-i386_2.9-2_amd64.deb
  to pool/main/g/glibc/libc6-dev_2.9-2_amd64.deb
  to pool/main/g/glibc/libc6-i386_2.9-2_amd64.deb
  to pool/main/g/glibc/libc6-pic_2.9-2_amd64.deb
  to pool/main/g/glibc/libc6-prof_2.9-2_amd64.deb
  to pool/main/g/glibc/libc6-udeb_2.9-2_amd64.udeb
  to pool/main/g/glibc/libc6_2.9-2_amd64.deb
  to pool/main/g/glibc/libnss-dns-udeb_2.9-2_amd64.udeb
  to pool/main/g/glibc/libnss-files-udeb_2.9-2_amd64.udeb
  to pool/main/g/glibc/locales-all_2.9-2_amd64.deb
  to pool/main/g/glibc/locales_2.9-2_all.deb
  to pool/main/g/glibc/nscd_2.9-2_amd64.deb

A summary of the changes between this version and the previous one is

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 516212@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
Aurelien Jarno <aurel32@debian.org> (supplier of updated glibc package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@debian.org)

Hash: SHA1

Format: 1.8
Date: Fri, 20 Feb 2009 22:25:19 +0100
Source: glibc
Binary: glibc-doc glibc-source locales locales-all nscd libc6 libc6-dev libc6-dbg libc6-prof libc6-pic libc6-udeb libc6.1 libc6.1-dev libc6.1-dbg libc6.1-prof libc6.1-pic libc6.1-udeb libc0.3 libc0.3-dev libc0.3-dbg libc0.3-prof libc0.3-pic libc0.3-udeb libc0.1 libc0.1-dev libc0.1-dbg libc0.1-prof libc0.1-pic libc0.1-udeb libc6-i386 libc6-dev-i386 libc6-sparc64 libc6-dev-sparc64 libc6-s390x libc6-dev-s390x libc6-amd64 libc6-dev-amd64 libc6-powerpc libc6-dev-powerpc libc6-ppc64 libc6-dev-ppc64 libc6-mipsn32 libc6-dev-mipsn32 libc6-mips64 libc6-dev-mips64 libc0.1-i386 libc0.1-dev-i386 libc6-sparcv9b libc6-i686 libc6-xen libc0.1-i686 libc6.1-alphaev67 libnss-dns-udeb libnss-files-udeb
Architecture: source all amd64
Version: 2.9-2
Distribution: unstable
Urgency: low
Maintainer: Aurelien Jarno <aurel32@debian.org>
Changed-By: Aurelien Jarno <aurel32@debian.org>
 glibc-doc  - GNU C Library: Documentation
 glibc-source - GNU C Library: sources
 libc0.1    - GNU C Library: Shared libraries
 libc0.1-dbg - GNU C Library: Libraries with debugging symbols
 libc0.1-dev - GNU C Library: Development Libraries and Header Files
 libc0.1-dev-i386 - GNU C Library: 32bit development libraries for AMD64
 libc0.1-i386 - GNU C Library: 32bit shared libraries for AMD64
 libc0.1-i686 - GNU C Library: Shared libraries [i686 optimized]
 libc0.1-pic - GNU C Library: PIC archive library
 libc0.1-prof - GNU C Library: Profiling Libraries
 libc0.1-udeb - GNU C Library: Shared libraries - udeb (udeb)
 libc0.3    - GNU C Library: Shared libraries
 libc0.3-dbg - GNU C Library: Libraries with debugging symbols
 libc0.3-dev - GNU C Library: Development Libraries and Header Files
 libc0.3-pic - GNU C Library: PIC archive library
 libc0.3-prof - GNU C Library: Profiling Libraries
 libc0.3-udeb - GNU C Library: Shared libraries - udeb (udeb)
 libc6      - GNU C Library: Shared libraries
 libc6-amd64 - GNU C Library: 64bit Shared libraries for AMD64
 libc6-dbg  - GNU C Library: Libraries with debugging symbols
 libc6-dev  - GNU C Library: Development Libraries and Header Files
 libc6-dev-amd64 - GNU C Library: 64bit Development Libraries for AMD64
 libc6-dev-i386 - GNU C Library: 32bit development libraries for AMD64
 libc6-dev-mips64 - GNU C Library: 64bit Development Libraries for MIPS64
 libc6-dev-mipsn32 - GNU C Library: n32 Development Libraries for MIPS64
 libc6-dev-powerpc - GNU C Library: 32bit powerpc development libraries for ppc64
 libc6-dev-ppc64 - GNU C Library: 64bit Development Libraries for PowerPC64
 libc6-dev-s390x - GNU C Library: 64bit Development Libraries for IBM zSeries
 libc6-dev-sparc64 - GNU C Library: 64bit Development Libraries for UltraSPARC
 libc6-i386 - GNU C Library: 32bit shared libraries for AMD64
 libc6-i686 - GNU C Library: Shared libraries [i686 optimized]
 libc6-mips64 - GNU C Library: 64bit Shared libraries for MIPS64
 libc6-mipsn32 - GNU C Library: n32 Shared libraries for MIPS64
 libc6-pic  - GNU C Library: PIC archive library
 libc6-powerpc - GNU C Library: 32bit powerpc shared libraries for ppc64
 libc6-ppc64 - GNU C Library: 64bit Shared libraries for PowerPC64
 libc6-prof - GNU C Library: Profiling Libraries
 libc6-s390x - GNU C Library: 64bit Shared libraries for IBM zSeries
 libc6-sparc64 - GNU C Library: 64bit Shared libraries for UltraSPARC
 libc6-sparcv9b - GNU C Library: Shared libraries [v9b optimized]
 libc6-udeb - GNU C Library: Shared libraries - udeb (udeb)
 libc6-xen  - GNU C Library: Shared libraries [Xen version]
 libc6.1    - GNU C Library: Shared libraries
 libc6.1-alphaev67 - GNU C Library: Shared libraries (EV67 optimized)
 libc6.1-dbg - GNU C Library: Libraries with debugging symbols
 libc6.1-dev - GNU C Library: Development Libraries and Header Files
 libc6.1-pic - GNU C Library: PIC archive library
 libc6.1-prof - GNU C Library: Profiling Libraries
 libc6.1-udeb - GNU C Library: Shared libraries - udeb (udeb)
 libnss-dns-udeb - GNU C Library: NSS helper for DNS - udeb (udeb)
 libnss-files-udeb - GNU C Library: NSS helper for files - udeb (udeb)
 locales    - GNU C Library: National Language (locale) data [support]
 locales-all - GNU C Library: Precompiled locale data
 nscd       - GNU C Library: Name Service Cache Daemon
Closes: 516212
 glibc (2.9-2) unstable; urgency=low
   [ Aurelien Jarno ]
   * testsuite-checking/*: ignore tst-cpuclock2 test, as it fails on
     machines using cpufreq.
   * Rename submitted/cvs-tsd.diff into hppa/cvs-tsd.diff.
   * patches/any/local-bashisms.diff: fix more bashisms in the testsuite.
   * rules.d/build.mk: define SHELL as /bin/bash.
   * patches/any/cvs-pthread_h.diff: patch from upstream to fix warning
     in pthread.h.
   * debhelper.in/libc.preinst: restart NSS services on upgrades from
     versions prior to 2.9-1.
   * debhelper.in/*symbols*, rules.d/debhelper.mk: allow linking against
     private symbols again, but with a strict dependency on the upstream
   * debhelper.in/nscd.init: fix cache flushing on restart/reload.  Closes:
   [ Petr Salinger ]
   * kfreebsd/local-sysdeps.diff: update to revision 2370 (from glibc-bsd).
   * drop kfreebsd/local-sysdeps28.diff (merged into local-sysdeps.diff).
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Package-Type: udeb

Version: GnuPG v1.4.9 (GNU/Linux)


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