In regard to: [Networker] "double free or corruption" on RHEL 4 client,...:

I'm running RHEL 4 AS update 3 with all current errata and Networker 7.3
build 190 on the client and server. On one client I noticed the backup
failed because the server couldn't connect. Checking the client I saw
that nsrexecd wasn't running and the following was logged in daemon.log:

*** glibc detected *** double free or corruption (out): 0xb400af28 ***

Red Hat 4 uses the aggressive glibc memory checking, including killing
applications that double free().  Previous versions of Red Hat didn't
have glibc 2.3.x with this enabled, and most of the other distributions
I've seen that are using 2.3.x only have it set to "warn", not "kill".

Search the Red Hat 4 Release notes for the MALLOC_CHECK_ environment
variable.  It can be set so that you receive a warning but the application
isn't automatically killed (it might still die later for related reasons,
but it's not killed automatically for a double free()).

Anyone else seen similar either on RHEL or with other UNIX builds?

We've seen that problem in other packages on RH 4.  AFAIK, it hasn't affected
any of our RH 4 NetWorker clients yet.

Tim
--
Tim Mooney                              mooney AT dogbert.cc.ndsu.NoDak DOT edu
Information Technology Services         (701) 231-1076 (Voice)
Room 242-J6, IACC Building              (701) 231-8541 (Fax)
North Dakota State University, Fargo, ND 58105-5164

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