Thanks, Tim! I never though of running strace on an interpreted program as I was trusting the underlying infrastructure - interpreter, shared libraries, kernel - will work flawlessly. Anyway, if I remove "ldap" from the shadow database setting in /etc/nsswitch.conf, it works. No need to remove any packages. There are some dated reports regarding a similar issue both on this list (https://www.mail-archive.com/backuppc-users AT lists.sourceforge DOT net/msg05864.html) and here: http://grokbase.com/t/centos/centos/08739v6e2j/backuppc-wont-fork-after-centos-5-2-upgrade. The second one seems to be related to a bug in the nss-ldap library, but this has long been fixed. Besides, the bug related to that last report also caused other issues that are not present in my case. Maybe it's a new incarnation of the old bug? I'll look through the diffs of the fix back then and the current code to try and make sense of it. It is weird that I can't reproduce the problem with sample code taken out of the context.

Stoyan

On Thu, May 14, 2015 at 4:34 AM, Tim Fletcher <tim AT night-shade.org DOT uk> wrote:

On 2015-05-14 10:41, Tim Fletcher wrote:

On 2015-05-13 03:41, Stoyan Stoyanov wrote:

Hi Holger,

 

While it seems like a packaging issue, there are no bug reports on launchpad, so I thought maybe someone on this list stumbled upon this problem. Unfortunately, nothing gets recorded in the LOG file. I ran perl in debug mode, but the program exits right after forking the child process so there is nothing really that hints on what the problem might be. Same code taken out of the context of the BackupPC script works fine i.e. child is forked and doesn't die immediately.

 

Stoyan

 

Hi Stoyan,

 

Does the system that BackupPC fails to start on have ldap configured?

 

I have this problem too and was looking at it again following your email, I noticed from strace that a called was being made to .ldaprc during backuppc startup.

 

I have removed all ldap config and packages from the server and backuppc now starts correctly.

 

I know this isn't a fix but at least it's a step forward.

 

I removed libnss-ldap auth-client-config ldap-auth-config ldap-auth-client libpam-ldap

I reran pam-auth-config and disabled the auto creation of home-dirs and systemd registration that I had enabled for ldap support.

 

 

Installing ldap-auth-client and it's dependencies stops backuppc starting correctly.

 

I've attached the output of strace on the service starting up and then exiting immediately.

 

Tim Fletcher
<tim AT night-shade.org DOT uk>

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