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Hi,

We currently receive a lot of reports from people running Red Hat
Linux (7.x and 8.0) that cannot access MySQL via TCP/IP after updating
the GNU C library (glibc) via Red Hat's up2date updating tool. MySQL
simply crashes in this case, only downgrading to the previous installed
glibc seemed to help.

I've done some more research on the subject and read up on several bugs
that have been filed into Red Hat's Bugzilla about that and I just wanted
to update you on the current situation:

https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=74943
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=75128
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=75290
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=75297
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=75684
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=75507

HJ Lu, one of the GNU core developers mentioned the following in bug #75684:

"glibc 2.2.5-40 changes a buffer type from 1k to 64k. Unfortunately, resolver
uses that buffer on stack. As the result, many threaded applications, which
have a lower stack limit, start to dump core for no apparent reasons."

Red Hat's Jakub Jelinek is working on a fix for glibc (it breaks other 
threaded applications as well, e.g. Sun's JDK, see bug #75507) and has created 
a preliminary glibc upgrade package for people to test. If it passes final QA,
Red Hat will make it available via up2date:

ftp://people.redhat.com/jakub/glibc/errata/

Seems like this package resolves the problem, as some people have confirmed
later in bug #75128.

So it's being worked on and will hopefully be resolved very soon.

According to the Cc: list in bug #75128, quite a lot of people are interested
in getting informed, when it's finally fixed :)

Bye,
        LenZ
- -- 
For technical support contracts, visit https://order.mysql.com/?ref=mlgr
   __  ___     ___ ____  __
  /  |/  /_ __/ __/ __ \/ /    Mr. Lenz Grimmer <[EMAIL PROTECTED]>
 / /|_/ / // /\ \/ /_/ / /__   MySQL AB, Production Engineer
/_/  /_/\_, /___/\___\_\___/   Hamburg, Germany
       <___/   www.mysql.com
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